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Xiao Z, Xu Y, Wang X, Wang Y, Qu J, Cheng M, Chen S. Relationship between optical properties and internal quality of potatoes during storage. Food Chem 2024; 441:138334. [PMID: 38185051 DOI: 10.1016/j.foodchem.2023.138334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 11/23/2023] [Accepted: 12/28/2023] [Indexed: 01/09/2024]
Abstract
The optical properties [absorption coefficient (μa) and reduced scattering coefficient (μs')] and internal quality [firmness (FI), moisture content (MC), and soluble solids content (SSC)] of stored potatoes at 25 °C were determined, along with ultrastructure observation. Potato tissue ultrastructure changed significantly with storage time, exhibiting enhanced scattering properties and a monotonic increase in μs'. The μa spectra showed significant correlations with MC and SSC, while the μs' spectra were more strongly correlated with FI. The competitive adaptive reweighted sampling (CARS) algorithm improved the prediction accuracy for partial least squares regression (PLSR) and support vector regression (SVR) models. The best predictions were 1st-Derivative-μs'-FI-PLSR (RP = 0.897, RMSEP = 0.036 N, RPD = 2.262), SG-μa -MC-SVR (RP = 0.886, RMSEP = 0.438 %, RPD = 2.157), and Raw-μa -SSC-SVR (RP = 0.873, RMSEP = 0.137 %, RPD = 2.050). These results demonstrate the potential for predicting internal quality using potato's optical properties.
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Affiliation(s)
- Zhengwei Xiao
- College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
| | - Yingchao Xu
- College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.
| | - Xiangyou Wang
- College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.
| | - Yi Wang
- College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
| | - Junzhe Qu
- College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
| | - Meng Cheng
- College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
| | - Shengfa Chen
- College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
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Yin J, Xie X, Wei X, Zhang H, Ying Q, Hu J. Source-specified atmospheric age distribution of black carbon and its impact on optical properties over the Yangtze River Delta. Sci Total Environ 2024; 923:171353. [PMID: 38432390 DOI: 10.1016/j.scitotenv.2024.171353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/27/2024] [Accepted: 02/27/2024] [Indexed: 03/05/2024]
Abstract
Black carbon (BC) exerts a profound and intricate impact on both air quality and climate due to its high light absorption. However, the uncertainty in representing the absorption enhancement of BC in climate models leads to an increased range in the modeled aerosol climate effects. Changes in BC optical properties could result either from atmospheric aging processes or from variations in its sources. In this study, a source-age model for identifying emission sources and aging states presented by University of California at Davis/California Institute of Technology (UCD/CIT) was used to simulate the atmospheric age distribution of BC from different sources and to quantify its impact on the optical properties of BC-containing particles. The results indicate that regions with greater aged BC concentrations do not correspond to regions with higher BC emissions due to atmospheric transport. High concentrations of aged BC are found in northern Yangtze River Delta (YRD) regions during summer. The chemical compositions of particles from different sources and with different atmospheric ages differ significantly. BC and primary organic aerosols (POA) are dominating in Traffic-dominated source while other components dominate in Industry-dominated source. As the atmospheric age increases, the mass fraction of secondary inorganic aerosols rises. Compared to the original model, the simulated mass absorption cross section of BC particles in the source-age model decreases while the single scattering albedo increases. This compensates for ~11 % of the overestimation of the simulated BC direct radiative forcing. Our study highlights that incorporating atmospheric age and source information into models can greatly improve the estimation of optical properties of BC-containing particles and deepen our understanding of their climate effects.
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Affiliation(s)
- Junjie Yin
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Xiaodong Xie
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
| | - Xiaodong Wei
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Hongliang Zhang
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Qi Ying
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Jianlin Hu
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
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Wang H, Su Y, Liu Y, Xie F, Zhou X, Yu R, Lü C, He J. Water-soluble brown carbon in atmospheric aerosols from the resource-dependent cities: Optical properties, chemical compositions and sources. J Environ Sci (China) 2024; 138:74-87. [PMID: 38135435 DOI: 10.1016/j.jes.2023.02.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 02/15/2023] [Accepted: 02/16/2023] [Indexed: 12/24/2023]
Abstract
As a vital type of light-absorbing aerosol, brown carbon (BrC) presents inherent associations with atmospheric photochemistry and climate change. However, the understanding of the chemical and optical properties of BrC is limited, especially in some resource-dependent cities with long heating periods in northwest China. This study showed that the annual average abundances of Water-soluble BrC (WS-BrC) were 9.33±7.42 and 8.69±6.29 µg/m3 in Baotou and Wuhai and the concentrations, absorption coefficient (Abs365), and mass absorption efficiency (MAE365) of WS-BrC presented significant seasonal patterns, with high values in the heating season and low values in the non-heating season; while showing opposite seasonal trends for the Absorption Ångström exponent (AAE300-400). Comparatively, the levels of WS-BrC in developing regions (such as cities in Asia) were higher than those in developed regions (such as cities in Europe and Australia), indicating the significant differences in energy consumption in these regions. By combining fluorescence excitation-emission matrix (EEM) spectra with the parallel factor (PARAFAC) model, humic-like (C1 and C2) and protein-like (C3) substances were identified, and accounted for 61.40%±4.66% and 38.6%±3.78% at Baotou, and 60.33%±6.29% and 39.67%±4.17% at Wuhai, respectively. The results of source apportionment suggested that the potential source regions of WS-BrC varied in heating vs. non-heating seasons and that the properties of WS-BrC significantly depended on primary emissions (e.g., combustion emissions) and secondary formation.
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Affiliation(s)
- Haoji Wang
- School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China
| | - Yue Su
- School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China.
| | - Yangzheng Liu
- School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China
| | - Fei Xie
- School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Environmental Monitoring Center of Inner Mongolia, Hohhot 010011, China
| | - Xingjun Zhou
- Environmental Monitoring Center of Inner Mongolia, Hohhot 010011, China
| | - Ruihong Yu
- School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
| | - Changwei Lü
- School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China
| | - Jiang He
- School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China.
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Adeline K, Féret J, Clenet H, Limousin J, Ourcival J, Mouillot F, Alleaume S, Jolivot A, Briottet X, Bidel L, Aria E, Defossez ATM, Gaubert T, Giffard-Carlet J, Kempf J, Longepierre D, Lopez F, Miraglio T, Vigouroux J, Debue M. Multi-scale datasets for monitoring Mediterranean oak forests from optical remote sensing during the SENTHYMED/MEDOAK experiment in the north of Montpellier (France). Data Brief 2024; 53:110185. [PMID: 38406250 PMCID: PMC10884421 DOI: 10.1016/j.dib.2024.110185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 01/30/2024] [Accepted: 02/05/2024] [Indexed: 02/27/2024] Open
Abstract
Mediterranean forests represent critical areas that are increasingly affected by the frequency of droughts and fires, anthropic activities and land use changes. Optical remote sensing data give access to several essential biodiversity variables, such as species traits (related to vegetation biophysical and biochemical composition), which can help to better understand the structure and functioning of these forests. However, their reliability highly depends on the scale of observation and the spectral configuration of the sensor. Thus, the objective of the SENTHYMED/MEDOAK experiment is to provide datasets from leaf to canopy scale in synchronization with remote sensing acquisitions obtained from multi-platform sensors having different spectral characteristics and spatial resolutions. Seven monthly data collections were performed between April and October 2021 (with a complementary one in June 2023) over two forests in the north of Montpellier, France, comprised of two oak endemic species with different phenological dynamics (evergreen: Quercus ilex and deciduous: Quercus pubescens) and a variability of canopy cover fractions (from dense to open canopy). These collections were coincident with satellite multispectral Sentinel-2 data and one with airborne hyperspectral AVIRIS-Next Generation data. In addition, satellite hyperspectral PRISMA and DESIS were also available for some dates. All these airborne and satellite data are provided from free online download websites. Eight datasets are presented in this paper from thirteen studied forest plots: (1) overstory and understory inventory, (2) 687 canopy plant area index from Li-COR plant canopy analyzers, (3) 1475 in situ spectral reflectances (oak canopy, trunk, grass, limestone, etc.) from ASD spectroradiometers, (4) 92 soil moistures and temperatures from IMKO and Campbell probes, (5) 747 leaf-clip optical data from SPAD and DUALEX sensors, (6) 2594 in-lab leaf directional-hemispherical reflectances and transmittances from ASD spectroradiometer coupled with an integrating sphere, (7) 747 in-lab measured leaf water and dry matter content, and additional leaf traits by inversion of the PROSPECT model and (8) UAV-borne LiDAR 3-D point clouds. These datasets can be useful for multi-scale and multi-temporal calibration/validation of high level satellite vegetation products such as species traits, for current and future imaging spectroscopic missions, and by fusing or comparing both multispectral and hyperspectral data. Other targeted applications can be forest 3-D modelling, biodiversity assessment, fire risk prevention and globally vegetation monitoring.
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Affiliation(s)
- K. Adeline
- ONERA / DOTA, Université de Toulouse, F-31055 Toulouse, France
| | - J.B. Féret
- TETIS, Université de Montpellier, AgroParisTech, Cirad, CNRS, INRAE, Montpellier, France
| | - H. Clenet
- UMR DYNAFOR, INRAE, Université de Toulouse, 24 Chemin de Borderouge, F-31326 Castanet Tolosan CEDEX, France
- Ecole d'Ingénieurs de Purpan, 75 Voie du TOEC, F-31076 Toulouse, France
| | - J.M. Limousin
- CEFE, Université de Montpellier, CNRS, EPHE, IRD, 34000 Montpellier, France
| | - J.M. Ourcival
- CEFE, Université de Montpellier, CNRS, EPHE, IRD, 34000 Montpellier, France
| | - F. Mouillot
- CEFE, Université de Montpellier, CNRS, EPHE, IRD, 34000 Montpellier, France
| | - S. Alleaume
- TETIS, Université de Montpellier, AgroParisTech, Cirad, CNRS, INRAE, Montpellier, France
| | - A. Jolivot
- TETIS, Université de Montpellier, AgroParisTech, Cirad, CNRS, INRAE, Montpellier, France
| | - X. Briottet
- ONERA / DOTA, Université de Toulouse, F-31055 Toulouse, France
| | - L. Bidel
- UMR IATE, Université de Montpellier, Institut Agro, INRAE, F-34060 Montpellier, France
| | - E. Aria
- UMR DYNAFOR, INRAE, Université de Toulouse, 24 Chemin de Borderouge, F-31326 Castanet Tolosan CEDEX, France
- Ecole d'Ingénieurs de Purpan, 75 Voie du TOEC, F-31076 Toulouse, France
| | - ATM. Defossez
- TETIS, Université de Montpellier, AgroParisTech, Cirad, CNRS, INRAE, Montpellier, France
| | - T. Gaubert
- ONERA / DOTA, Université de Toulouse, F-31055 Toulouse, France
| | - J. Giffard-Carlet
- TETIS, Université de Montpellier, AgroParisTech, Cirad, CNRS, INRAE, Montpellier, France
| | - J. Kempf
- CEFE, Université de Montpellier, CNRS, EPHE, IRD, 34000 Montpellier, France
| | - D. Longepierre
- CEFE, Université de Montpellier, CNRS, EPHE, IRD, 34000 Montpellier, France
| | - F. Lopez
- CEFE, Université de Montpellier, CNRS, EPHE, IRD, 34000 Montpellier, France
| | - T. Miraglio
- ONERA / DOTA, Université de Toulouse, F-31055 Toulouse, France
| | - J. Vigouroux
- UMR DYNAFOR, INRAE, Université de Toulouse, 24 Chemin de Borderouge, F-31326 Castanet Tolosan CEDEX, France
- Ecole d'Ingénieurs de Purpan, 75 Voie du TOEC, F-31076 Toulouse, France
| | - M. Debue
- ONERA / DOTA, Université de Toulouse, F-31055 Toulouse, France
- CESBIO, Université de Toulouse, CNES/CNRS/INRAE/IRD/UT3-Paul Sabatier, 18, Avenue Edouard Belin, 31401 Toulouse, France
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Kurpanik R, Gajek M, Gryń K, Jeleń P, Ścisłowska-Czarnecka A, Stodolak-Zych E. Multiscale characterization of electrospun non-wovens for corneal regeneration: Impact of microstructure on mechanical, optical and biological properties. J Mech Behav Biomed Mater 2024; 152:106437. [PMID: 38354568 DOI: 10.1016/j.jmbbm.2024.106437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 01/21/2024] [Accepted: 01/26/2024] [Indexed: 02/16/2024]
Abstract
The multiscale approach in designing substrates for regenerative medicine endows them with beneficial properties determining their performance in the body. Substrates for corneal regeneration should reveal the proper transparency, mechanical properties and microstructure to maintain the functionality of the regenerated tissue. In our study, series of non-wovens with different fibres orientation (random (R), aligned (A)), topography (shish-kebab (KK), core-shell (CS)) and thickness were fabricated via electrospinning. The samples were assessed for mechanical (static tensile test) and optical properties (spectroscopy UV-Vis). The research evaluated the impact of different microstructures on the viability and morphology of three cell lines (Hs 680, HaCaT and RAW 264.7). The results showed how the fibres arrangement influenced mechanical behaviour of the non-wovens. The randomly oriented fibres were more elongated (up to 50 mm) and had a lower maximum tensile force (up to 0.46 N). In turn, the aligned fibres were characterized by lower elongation (up to 19 mm) and higher force (up to 1.45 N). The conducted transparency tests showed the relation between thickness (of the non-woven and fibres) and morphology of the substrate and light transmission. To simulate the in vivo conditions, prior to the light transmission studies, samples were immersed in water. All the samples exhibited high transparency after immersion in water (>80%). The impact of various morphologies was observed in the in vitro studies. All the samples proved high cells viability. Moreover, the substrate morphology had a significant impact on the orientation and arrangement of the fibroblast cytoskeleton. The aligned fibres were oriented in exactly the same direction. The conducted research proved that, by altering the non-wovens microstructure, the properties can be adjusted so as to induce the desirable cellular reaction. This indicates the high potential of electrospun fibres in terms of modulating the corneal cell behaviour in response to the implanted substrate.
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Affiliation(s)
- Roksana Kurpanik
- Department of Biomaterials and Composites, Faculty of Materials Science and Ceramics, AGH University of Krakow, 30-059 Krakow, Poland.
| | - Marcin Gajek
- Department of Ceramics and Refractories, Faculty of Materials Science and Ceramics, AGH University of Krakow, 30-059 Krakow, Poland
| | - Karol Gryń
- Department of Biomaterials and Composites, Faculty of Materials Science and Ceramics, AGH University of Krakow, 30-059 Krakow, Poland
| | - Piotr Jeleń
- Department of Silicate Chemistry and Macromolecular Compounds, Faculty of Materials Science and Ceramics, AGH University of Krakow, 30-059 Krakow, Poland
| | | | - Ewa Stodolak-Zych
- Department of Biomaterials and Composites, Faculty of Materials Science and Ceramics, AGH University of Krakow, 30-059 Krakow, Poland
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Ruiz MG, Castro A, Herranz J, da Silva A, John PM, Trampert A, Brandt O, Geelhaar L, Lähnemann J. Composition and optical properties of (In,Ga)As nanowires grown by group-III-assisted molecular beam epitaxy. Nanotechnology 2024. [PMID: 38527360 DOI: 10.1088/1361-6528/ad375b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
(In,Ga) alloy droplets are used to catalyse the growth of (In,Ga)As nanowires by molecular beam epitaxy on Si(111) substrates. The composition, morphology and optical properties of these nanowires can be tuned by the employed elemental fluxes. To incorporate more than 10% of In, a high In/(In+Ga) flux ratio above 0.7 is required. We report a maximum In content of almost 30% in bulk (In,Ga)As nanowires for an In/(In+Ga) flux ratio of 0.8. However, with increasing In/(In+Ga) flux ratio, the nanowire length and diameter are notably reduced. Using photoluminescence and cathodoluminescence spectroscopy on nanowires covered by a passivating (In,Al)As shell, two luminescence bands are observed. A significant segment of the nanowires shows homogeneous emission, with a wavelength corresponding to the In content in this segment, while the consumption of the catalyst droplet leads to a spectrally-shifted emission band at the top of the nanowires. The (In,Ga)As nanowires studied in this work provide a new approach for the integration of infrared emitters on Si platforms.
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Affiliation(s)
- Mikel Gómez Ruiz
- Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin eV, Hausvogteipl. 5-7, Berlin, Berlin, Berlin, 10117, GERMANY
| | - Aron Castro
- Paul Drude Institute for Solid State Electronics, Hausvogteipl. 5-7, Berlin, Berlin, 10117, GERMANY
| | - Jesus Herranz
- Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin eV, Hausvogteipl. 5-7, Berlin, Berlin, Berlin, 10117, GERMANY
| | - Alessandra da Silva
- Microstructure, Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin eV, Hausvogteipl. 5-7, Berlin, Berlin, Berlin, 11017, GERMANY
| | - Philipp Maximilian John
- Epitaxy, Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin eV, Hausvogteiplatz 5-7, Berlin, 10117, GERMANY
| | - Achim Trampert
- Dep Semiconductor Epitaxy, Paul-Drude-Institut fuer Festkoerperelektronik, Hausvogteiplatz 5/7, D-10117 Berlin, Berlin, 10117, GERMANY
| | - Oliver Brandt
- Semiconductor Spectroscopy, Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin eV, Hausvogteiplatz 5-7, 10117 Berlin, Berlin, 10117, GERMANY
| | - Lutz Geelhaar
- Paul-Drude-Institut fuer Festkoerperelektronik, Hausvogteiplatz 5-7, Berlin, 10117, GERMANY
| | - Jonas Lähnemann
- Semiconductor Spectroscopy, Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin eV, Hausvogteiplatz 5-7, Berlin, 10117, GERMANY
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Nazari N, Golzan MM, Mabhouti K. Study of Urbach energy and Kramers-Kronig on Mn and Zn doped NiFe 2O 4 ferrite nanopowder for the determination of structural and optical characteristics. Sci Rep 2024; 14:6407. [PMID: 38494547 PMCID: PMC10944846 DOI: 10.1038/s41598-024-57045-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/13/2024] [Indexed: 03/19/2024] Open
Abstract
MxNi1-xFe2O4 spinel ferrite (M = Mn, Zn, and x = 0, 0.05) has been successfully synthesized by co-precipitation technique with hydrazine hydrate reduction agent (instead of NaOH) and Ethylene glycol surfactant. The XRD spectra of the samples illustrated high crystallinity. The structural characterization of pure and doped fcc NiFe2O4 were calculated by Scherrer, Modified Scherrer, Williamson-Hall, and SSP methods. In comparison of several methods, the Scherrer method is unreasonable method and W-H method has an acceptable range and can calculate both < L > and strain without restriction. The specific surface area in Zn-doped increased, demonstrate increment of adsorption properties in Ni ferrite structure. TEM images revealed the shape of grains is spherical, cubic, and irregular, with a grain size in the range of 35-65 nm. Hysteresis loops illustrated the magnetic behavior of samples. From the reflectance data, the band gap energies were estimated at 1.984, 1.954, and 1.973 eV for un-doped, Mn, and Zn-doped NiFe2O4 respectively (red shift). The almost low value of Urbach energy for pure, Mn, and Zn -doped NiFe2O4 indicates low structural disorder, which can approve the high crystallinity of samples. Direct band gap energy (Eg), refractive index, and extinction coefficient were estimated by the Kramers-Kronig method with linear optical evaluations. The Eg by K-K method is in good agreement with the Eg by Kubelka-Munk function.
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Affiliation(s)
- N Nazari
- Department of Physics, Faculty of Sciences, Urmia University, Urmia, Iran
| | - M M Golzan
- Department of Physics, Faculty of Sciences, Urmia University, Urmia, Iran
| | - Kh Mabhouti
- Department of Physics, Faculty of Sciences, Urmia University, Urmia, Iran.
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Yasin Ahmed T, Aziz SB, M. A. Dannoun E. New photocatalytic materials based on alumina with reduced band gap: A DFT approach to study the band structure and optical properties. Heliyon 2024; 10:e27029. [PMID: 38468939 PMCID: PMC10926069 DOI: 10.1016/j.heliyon.2024.e27029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 02/22/2024] [Accepted: 02/22/2024] [Indexed: 03/13/2024] Open
Abstract
In this study, first-principles calculations using Density Functional Theory (DFT) have been conducted, which were carried out using the Vienna Ab initio Simulation Package (VASP) to examine the effect of Tl insertion on electronic and optical properties of the α-Al2O3. Alumina materials are abundant and the main shortcoming of alumina for photocatalyst applications is their large energy band gap and little absorption in the visible region of electromagnetic (EM) radiation. Insertion of transition metals (TM) into semiconductor or insulating materials is a hot approach to improve the absorption behavior of these materials using DFT assessment. In the current work an analysis of the band structure (BS) and the density of states (DOS); comprising both the total density of states (TDOS) as well as the partial density of states (PDOS) were carried out. The BS diagram revealed that various concentrations of Tl insertion into the α-Al2O3 reduced the band gap to 2.38 eV. In the density of state diagram, the band gap energy shifted to lower photon energies with increasing Tl concentrations which supports the BS results. The band gap obtained from the first peak in the imaginary part of dielectric function is close enough to those established from the BS diagram. Distinguished shifting of absorption coefficient to lower photon energy (2.27 eV) reveals the suitability of the doped α-Al2O3 for various applications. The increase of refractive index (n) with increasing of Tl into the α-Al2O3 structure is evidence for the increase of charge, which is a source for polarization and attenuates the velocity of light in a medium. The increase of optical conductivity with photon energy started after band gap values. The reflectance, absorbance and transmittance results indicate that the doped α-Al2O3 is responsive to the visible region of EM radiation while in pure state almost transparent.
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Affiliation(s)
- Taha Yasin Ahmed
- Physics Department, College of Science, University of Sulaimani, Kurdistan Regional Government, Qlyasan Street, Sulaymaniyah 46001, Iraq
| | - Shujahadeen B. Aziz
- Research and Development Center, University of Sulaimani, Kurdistan Regional Government, Sulaimani 46001, Iraq
- Department of Physics, College of Science, Charmo University, Chamchamal, 46023, Sulaymaniyah, Iraq
| | - Elham M. A. Dannoun
- Department of Mathematics and Sciences, Woman Campus, Prince Sultan University, P.O. Box 66833, Riyadh 11586, Saudi Arabia
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Santos EAJ, Lima KAL, Ribeiro Junior LA. Proposing TODD-graphene as a novel porous 2D carbon allotrope designed for superior lithium-ion battery efficiency. Sci Rep 2024; 14:6202. [PMID: 38485984 PMCID: PMC10940596 DOI: 10.1038/s41598-024-56312-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 03/05/2024] [Indexed: 03/18/2024] Open
Abstract
The category of 2D carbon allotropes has gained considerable interest due to its outstanding optoelectronic and mechanical characteristics, which are crucial for various device applications, including energy storage. This study uses density functional theory calculations, ab initio molecular dynamics (AIMD), and classical reactive molecular dynamics (MD) simulations to introduce TODD-Graphene, an innovative 2D planar carbon allotrope with a distinctive porous arrangement comprising 3-8-10-12 carbon rings. TODD-G exhibits intrinsic metallic properties with a low formation energy and stability in thermal and mechanical behavior. Calculations indicate a substantial theoretical capacity for adsorbing Li atoms, revealing a low average diffusion barrier of 0.83 eV. The metallic framework boasts excellent conductivity and positioning TODD-G as an active layer for superior lithium-ion battery efficiency. Charge carrier mobility calculations for electrons and holes in TODD-G surpass those of graphene. Classical reactive MD simulation results affirm its structural integrity, maintaining stability without bond reconstructions at 2200 K.
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Affiliation(s)
- E A J Santos
- Institute of Physics, University of Brasília, Brasília, 70910-900, Brazil
- Computational Materials Laboratory, LCCMat, Institute of Physics, University of Brasília, Brasília, 70910-900, Brazil
| | - K A L Lima
- Institute of Physics, University of Brasília, Brasília, 70910-900, Brazil
- Computational Materials Laboratory, LCCMat, Institute of Physics, University of Brasília, Brasília, 70910-900, Brazil
| | - L A Ribeiro Junior
- Institute of Physics, University of Brasília, Brasília, 70910-900, Brazil.
- Computational Materials Laboratory, LCCMat, Institute of Physics, University of Brasília, Brasília, 70910-900, Brazil.
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10
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Santosh R, Chandra S, Kumar V, Tripathi BMM, Kumar P. The structural, stability, electronic, optical and thermodynamic properties of MoX 2 (X= S, Se, and Te) under hydrostatic pressures: a plasmon approach and first-principle study. J Mol Model 2024; 30:99. [PMID: 38462593 DOI: 10.1007/s00894-024-05887-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Accepted: 02/23/2024] [Indexed: 03/12/2024]
Abstract
CONTEXT The new equations have been developed for the structural and electronic properties using the plasmon calculations for the first time for 2-D MoX2 structures. Literature shows still an extensive study is required on the stability and optical properties of MoX2 under different hydrostatic pressures and thermal properties under different temperatures using the first principles, for electronic industrial applications. The stability is analyzed using binding energy and phonon calculations. The phase transition of metallization of MoX2 is discussed using band structure calculations under different hydrostatic pressures. The calculated work function shows the photoemission starts from the threshold frequency of 4.189×104 cm-1, 3.184×104 cm-1, and 3.651×104 cm-1, respectively, for MoS2, MoSe2, and MoTe2 materials. The optical properties such as refractive index n(0), and static dielectric permittivity ε(0) for three successive materials are calculated under different hydrostatic pressures, applicable for optoelectronic applications. The calculated theoretical and computational values agree well with each other and also agree with reported and experimental values. Some of the values are calculated for the first time. METHODS The theoretical equations are derived using the molecular weight, effective valence electrons, and density of molecule of MoX2 structures. The simulation work is performed using GGA-PBE approximation in the CASTEP simulation package with DFT+D semi-empirical dispersion correction. An ultra-soft pseudopotential representation calculates the electronic and optical properties with a finite basis set kinetic energy cut-off of 381.0 eV. Each geometry has been optimized using Broyden, Fletcher, Goldfarb, and Shanno's (BFGS) algorithm for 100 iterations with a fixed basis quality variable cell method and finite electronic minimization parameters. The phonon calculations were performed using TDFT with a kinetic energy cut of 460 eV in a norm-conserving linear response method. The interpolation with a finite dispersion quality and q-vector grid spacing is performed.
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Affiliation(s)
- R Santosh
- Department of Electronics and Communication Engineering, Velagapudi Ramakrishna Siddhartha College of Engineering, Kanuru, Vijayawada, Andhra Pradesh, 520007, India.
- Department of Electronic and Communication Engineering, Lendi Institute of Engineering and Technology, Jonnada, Vizianagaram, Andhra Pradesh, 535005, India.
| | - S Chandra
- Department of Electronics and Communication Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, 211004, India
| | - V Kumar
- Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - B M M Tripathi
- Department of Electronics and Communication Engineering, Velagapudi Ramakrishna Siddhartha College of Engineering, Kanuru, Vijayawada, Andhra Pradesh, 520007, India
| | - Pankaj Kumar
- Department of Electronics and Communication Engineering, Graphic Era (Deemed to be University), Dehradun, Uttarakhand, India
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11
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Yousry M, Hammad I, Halawani ME, Aboushelib M. Translucency of recent zirconia materials and material-related variables affecting their translucency: a systematic review and meta-analysis. BMC Oral Health 2024; 24:309. [PMID: 38443872 PMCID: PMC10913643 DOI: 10.1186/s12903-024-04070-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Accepted: 02/25/2024] [Indexed: 03/07/2024] Open
Abstract
BACKGROUND Recent forms of translucent zirconia material have been developed, offering a wide range of options and varieties for enhancing aesthetics, making it a preferred choice in the field of prosthetic dentistry. However, there is insufficient understanding regarding the recent types of zirconia materials and their optical behavior. Understanding the variables that influence the translucency of zirconia and identifying strategies to enhance its esthetics are crucial. PURPOSE The current systemic review highlights a comprehensive understanding of different zirconia generations in relation to their optical characteristics and evaluates material-related variables affecting their translucency. METHODS The present review studied in-vitro studies that evaluated the optical characteristics of different yttria content of yttria stabilized materials. The topics explored were: (1) the different zirconia material generations and their optical behavior; (2) material-related factors that affect their translucency. The research was restricted to online publication in the English language from July 1, 2010, to July 31, 2023, using PubMed, Scopus, and Science Direct resources. The search key terms and their combinations were "zirconia," "translucent zirconia," "cubic zirconia," "highly translucent zirconia," "yttria partially stabilized zirconia," "monolithic zirconia," "translucency," "optical properties," and "light transmission." RESULTS The data obtained from fifty-three studies addressed the optical characteristics of various zirconia generations. They reported that changing yttria content had a significant impact on translucency. Different kinds of zirconia ceramics of the same generation have varying translucencies. Achieving optimum aesthetics with monolithic zirconia is challenging due to factors related to material aspects such as the presence of additives, point defects, microstructure, thickness, phase distribution, and sintering conditions. CONCLUSIONS Newly developed monolithic dental zirconia ceramics have improved aesthetics and translucency. However, additional research is necessary to evaluate their performance and long-term durability. TRIAL REGISTRATION This systematic review was registered in PROSPERO, under number CRD42023474482.
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Affiliation(s)
- Mahinour Yousry
- Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
| | - Ihab Hammad
- Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Mohamed El Halawani
- Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Moustafa Aboushelib
- Department of Dental Materials Science, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
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12
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Roy M, Sykora M, Aslam M. Chemical Aspects of Halide Perovskite Nanocrystals. Top Curr Chem (Cham) 2024; 382:9. [PMID: 38430313 DOI: 10.1007/s41061-024-00453-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 01/24/2024] [Indexed: 03/03/2024]
Abstract
Halide perovskite nanocrystals (HPNCs) are currently among the most intensely investigated group of materials. Structurally related to the bulk halide perovskites (HPs), HPNCs are nanostructures with distinct chemical, optical, and electronic properties and significant practical potential. One of the keys to the effective exploitation of the HPNCs in advanced technologies is the development of controllable, reproducible, and scalable methods for preparation of materials with desired compositions, phases, and shapes and low defect content. Another important condition is a quantitative understanding of factors affecting the chemical stability and the optical and electronic properties of HPNCs. Here we review important recent developments in these areas. Following a brief historical prospective, we provide an overview of known chemical methods for preparation of HPNCs and approaches used to control their composition, phase, size, and shape. We then review studies of the relationship between the chemical composition and optical properties of HPNCs, degradation mechanisms, and effects of charge injection. Finally, we provide a short summary and an outlook. The aim of this review is not to provide a comprehensive summary of all relevant literature but rather a selection of highlights, which, in the subjective view of the authors, provide the most significant recent observations and relevant analyses.
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Affiliation(s)
- Mrinmoy Roy
- Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400076, India
- Laboratory for Advanced Materials, Faculty of Natural Sciences, Comenius University, Bratislava, 84104, Slovakia
| | - Milan Sykora
- Laboratory for Advanced Materials, Faculty of Natural Sciences, Comenius University, Bratislava, 84104, Slovakia
| | - M Aslam
- Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400076, India.
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13
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da Silva Rodrigues C, da Silva AC, Sabino CF, de Melo RM, Campos TMB. Borosilicate glass as a surface finishing alternative for improving the mechanical properties of third-generation zirconia. Dent Mater 2024; 40:477-483. [PMID: 38145923 DOI: 10.1016/j.dental.2023.12.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 12/10/2023] [Accepted: 12/11/2023] [Indexed: 12/27/2023]
Abstract
OBJECTIVE This study evaluated the effect of an experimental borosilicate glass on the mechanical and optical behavior of 5Y-PSZ zirconia and comparing it to commercial glaze and as-sintered. METHODS Disc-shaped specimens of a 5Y-PSZ (Zpex Smile) were prepared and sintered (1550 °C, 2 h). The zirconia discs were randomly divided according to the surface treatment: as-sintered (C), commercial glaze (G), and experimental borosilicate glass (SL). Glaze and experimental glass powders were mixed with building liquids and applied to zirconia with a brush. G specimens were fired at 950 °C and SL at 1200 °C. An extended dwell time of 20 min was applied to both groups. Biaxial flexural strength, roughness (Ra and Rz), translucency (TP00), color alteration (ΔE00), Vickers hardness, fracture toughness, residual stresses, and x-ray diffraction analyses were conducted. Statistical analyses were performed with Weibull statistics, Kruskal-Wallis, or ANOVA tests (α = 5%). RESULTS SL yielded the highest flexural strength (799.35 MPa), followed by G (662.34 MPa), and C (485.38 MPa). The fracture origin of SL specimens was in the bulk zirconia, while G and C showed fractures starting at the surface. As-sintered reached the highest fracture toughness and hardness. Glaze and borosilicate glass provided surface compressive stresses. Borosilicate glass application led to phase transformation (t→m). SL and G showed the lowest roughness. TP00 and ΔE00 were similar among groups. SIGNIFICANCE Borosilicate glass improved strength without harming the optical properties of third-generation zirconia. Toughness and roughness provided by the experimental glass were similar to those from commercial glaze.
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Affiliation(s)
- Camila da Silva Rodrigues
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP, Brazil; Graduate Program in Dentistry, Federal University of Pelotas (UFPel), Pelotas, RS, Brazil.
| | - Ana Carolina da Silva
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP, Brazil.
| | - Clarice Ferreira Sabino
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP, Brazil.
| | - Renata Marques de Melo
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP, Brazil.
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Boudissa R, Zerrougui Z, Ghebouli M, Bouferrache K, Krache L, Chihi T, Ghebouli B, Habila MA, Fatmi M, Sillanpää M. Prediction study of structural, electronic and optical properties of 4C 16H 10Br 2O 2 Bis (m-bromobenzoyl) methane crystals. Biochem Biophys Rep 2024; 37:101601. [PMID: 38146351 PMCID: PMC10749249 DOI: 10.1016/j.bbrep.2023.101601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 11/21/2023] [Accepted: 11/29/2023] [Indexed: 12/27/2023] Open
Abstract
By first-principles calculations with density functional theory and a pseudopotential approach, the structural, electronic, and optical properties of the anhydrous 4C16H10Br2O2 Bis (2-Bromobenzoyl) Methane crystals in Pbnc (N°60) and P21/c (N°14) space group are investigated. All computations are determined by a generalized gradient approximation, local density approximation and an ultra-soft pseudopotential. The calculated equilibrium parameters are in good agreement with their available experimental data. This calculation shows that the GGA/PW91 functional overestimate the lattice constant, unlike the LDA/CA-PZ. The Br-C bond distance of 1.856 (1.902) Å is comparable with experimental value of 1.901 (1.896) Å in Pbnc (P21/c) space groups. The direct band gap nature is obtained for both space groups Pbnc and P21/c, since the maximum of the valence band and the minimum of the conduction band are both situated at the YA center.
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Affiliation(s)
- R. Boudissa
- Research Unit on Emerging Materials (RUEM), University Ferhat Abbas of Setif 1, Setif, 19000, Algeria
| | - Z. Zerrougui
- Laboratory of Studies Surfaces and Interfaces of Solids Materials, Faculty of Technology, University Ferhat Abbas of Setif 1, Setif, 19000, Algeria
| | - M.A. Ghebouli
- Research Unit on Emerging Materials (RUEM), University Ferhat Abbas of Setif 1, Setif, 19000, Algeria
| | - K. Bouferrache
- Department of Physics, Faculty of Sciences, University of Mohamed Boudiaf, M'sila, 28000, Algeria
| | - L. Krache
- PQSD Laboratory, Department of Physics, Faculty of Science, University Ferhat Abbas of Setif 1, Setif, 19000, Algeria
| | - T. Chihi
- Research Unit on Emerging Materials (RUEM), University Ferhat Abbas of Setif 1, Setif, 19000, Algeria
| | - B. Ghebouli
- Laboratory for the Study of Surfaces and Interfaces of Solid Materials (LESIMS), University Ferhat Abbas of Setif 1, Setif, 19000, Algeria
| | - Mohamed A. Habila
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - M. Fatmi
- Research Unit on Emerging Materials (RUEM), University Ferhat Abbas of Setif 1, Setif, 19000, Algeria
| | - Mika Sillanpää
- Department of Biological and Chemical Engineering, Aarhus University, Norrebrogade 44, 8000, Aarhus C, Denmark
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15
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Xu L, Hu Q, Liu Z, Jian M, Peng Y, Shen R, Liao W, Zhong A. Hydrological alteration drives chemistry of dissolved organic matter in the largest freshwater lake of China (Poyang Lake). Water Res 2024; 251:121154. [PMID: 38271743 DOI: 10.1016/j.watres.2024.121154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 01/15/2024] [Accepted: 01/16/2024] [Indexed: 01/27/2024]
Abstract
As the largest reactive organic carbon pool, dissolved organic matter (DOM) plays an important role in various biogeochemical processes in lake ecosystems. Recently, climate change-induced extreme events (e.g., floods and droughts) have significantly modified the hydrological patterns of lakes worldwide, and regulated the quality and quantity of DOM. However, the responses of DOM chemistry to hydrological alteration in lakes remain poorly understood. Here we investigated the influences of hydrological alteration on sources, composition, and characteristics of DOM in Poyang Lake, the largest freshwater lake in China, using a combination of bulk chemical, optical and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) techniques. Results show various sources of DOM (autochthonous, allochthonous, and anthropogenic inputs) and significant variations in DOM chemistry across four hydrological periods (the retreating, dry, rising, and flooding periods) in Poyang Lake. During the retreating, rising, and flooding periods, DOM was characterized by higher aromaticity, humification degree, and recalcitrance, and exhibited pronounced allochthonous signatures. In contrast, DOM contained more S-containing molecules and aliphatic compounds during the dry period, displaying relatively stronger autochthonous features. Terrestrial inputs and the lignin-CHOS formation process are likely the primary underlying mechanisms shaping the differences in DOM chemistry in Poyang Lake. Our research demonstrates the significant impacts of hydrological alteration on DOM dynamics, and provides an improved understanding of DOM biogeochemical cycles and carbon cycling in large aquatic systems under global climate change.
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Affiliation(s)
- Lei Xu
- Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China
| | - Qian Hu
- Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China
| | - Zetian Liu
- Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China
| | - Minfei Jian
- College of Life Science, Jiangxi Provincial Key Laboratory of Protection and Utilization of Subtropical Plant Resources, Jiangxi Normal University, Nanchang, 330022, China
| | - Yansong Peng
- Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China
| | - Ruichang Shen
- Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecology, School of Life Science, Nanchang University, Nanchang 330031, China; Jiangxi Poyang Lake Wetland Conservation and Restoration National Permanent Scientific Research Base, National Ecosystem Research Station of Jiangxi Poyang Lake Wetland, Nanchang University, Nanchang 330031, China
| | - Wei Liao
- Wetland Research Center, Jiangxi Academy of Forestry, Nanchang, 330032, China.
| | - Aiwen Zhong
- Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China.
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Huang Z, Wang Y, Wang C, Liu G, Zhang G, Niu J. Effect of tensile deformation on the optoelectronic properties of black phosphine-doped lithium atoms. J Mol Model 2024; 30:90. [PMID: 38424275 DOI: 10.1007/s00894-024-05880-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 02/14/2024] [Indexed: 03/02/2024]
Abstract
CONTEXT First-principles calculations based on the generalized gradient approximation gradient and the Perdew-Burke-Ernzerhof function (GGA-PBE generalized function) are carried out on the intrinsic and lithium-doped black phosphine systems to investigate the effects of different uniaxial tensile deformations on the electronic and optical properties of the systems. It is shown that the structural stability of the intrinsic and lithium-doped systems decreases with increasing tensile deformation, and all systems are most stable at 0% tensile deformation. The intrinsic black phosphazene system is a direct band gap semiconductor, and its band gap increases and then decreases with tensile deformation and reaches a maximum value of 1.086 eV at 4%. Lithium doping closes the band gap of the black phosphazene system, which is metallic in nature, but the band gap is opened up when the tensile deformation is 4-6%. From the density of states analysis, the density of states of all systems is basically contributed by the s and p orbitals, with little contribution from the d orbitals, and the contribution from the p orbitals is dominant. From the analysis of optical properties, the increase of tensile deformation causes the absorption peaks of the intrinsic system to redshift then blueshift then redshift, causes the absorption peaks of the lithium-doped system to redshift, and causes the reflection peaks of all systems to redshift. In addition, lithium doping blueshifts the absorption and reflection peaks of the systems compared to the intrinsic black phosphazene system. METHODS Using the CASTEP section of the Materials Studio software, first-principle calculations based on density functional theory are done on the top-site doped lithium atoms of monolayer black phosphine under uniaxial stretching deformation in the a-direction, and the generalized gradient approximation gradients and Perdew-Burke-Ernzerhof functions (GGA-PBE generalized functionals) are used for the optimization and approximation process. The optimization parameters are set for the supercell structure: its plane-wave truncation energy is set to 400 eV, its Brillouin zone K-point grid is set to 3*3*3, its self-consistent field iteration accuracy convergence value is 2.0e-6 eV/atom, the convergence basis of its structural optimization is 0.02 eV/ Å, and the convergence of the stress value is 0.05 gpa. During the optimization period, the interaction force between atoms is 0.03 eV/ Å and the atomic displacement is less than 0.001 Å. To eliminate the effect of interlayer forces, a vacuum layer with a thickness of 15 Å is placed in its vertical direction (i.e., c-axis direction).
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Affiliation(s)
- Zenan Huang
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Ying Wang
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China.
| | - Congrui Wang
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Guili Liu
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Guoying Zhang
- College of Physical Science and Technology, Shenyang Normal University, Shenyang, 110034, China
| | - Jindong Niu
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
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Wang Y, Ren D, Li Y, Hao Z, Liu J. Spatiotemporal dynamics of dissolved organic matter and disinfection by-products formation potential of Shengzhong Lake in southwest China. Environ Sci Pollut Res Int 2024; 31:21568-21577. [PMID: 38393559 DOI: 10.1007/s11356-024-32548-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 02/15/2024] [Indexed: 02/25/2024]
Abstract
The quality and quantity of dissolved organic matter (DOM) in lakes as well as its environmental effects associated with the unintended disinfection by-products (DBPs) have received continuous attention. This work investigated the spatiotemporal dynamics of DOM in Shengzhong Lake in southwest China and the formed DBPs during the chlorine disinfection process. The results showed that lake water in summer had significantly higher dissolved oxygen and dissolved organic carbon than that in winter. In contrast, DOM in winter demonstrated an obviously higher aromaticity and molecular weight than that in summer. Four fluorescence components, i.e., terrestrial humic-like substances (C1), protein-like substances (C2), and microbial humic-like substances (C3 and C4), were identified, and their relative abundance followed in the order of C3 > C4 > C2 > C1 in winter and C4 > C3 > C1 > C2 in summer. The formation potential of trihalomethanes and haloacetic acids in winter was higher and lower than that in summer, which was mainly ascribed to the content of aromatic and hydrophobic substances. Compared to the significant seasonal dynamic, the spatial variation of DOM and the formed DBPs was not obvious. This work sheds light on the spatial-temporal distribution of DOM and the potentially formed DBPs in Shengzhong Lake, and will be helpful for understanding the biogeochemical cycle of carbon and assessing the drinking water safety.
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Affiliation(s)
- Yunwen Wang
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637009, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Dong Ren
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637009, China
- Nanchong Key Laboratory of Eco-Environmental Protection and Pollution Prevention in Jialing River Basin, Nanchong, 637000, China
| | - Yunxiang Li
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637009, China
| | - Zhineng Hao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
| | - Jingfu Liu
- Institute of Environment and Health, Jianghan University, Wuhan, 430056, China
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Ni Z, Wu Y, Ma Y, Li Y, Li D, Lin W, Wang S, Zhou C. Spatial gradients and molecular transformations of DOM, DON and DOS in human-impacted estuarine sediments. Environ Int 2024; 185:108518. [PMID: 38430584 DOI: 10.1016/j.envint.2024.108518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 01/11/2024] [Accepted: 02/18/2024] [Indexed: 03/04/2024]
Abstract
Dissolved organic matter (DOM) constitutes the most active fraction in global carbon pools, with estuarine sediments serving as significant repositories, where DOM is susceptible to dynamic transformations. Anthropogenic nitrogen (N) and sulfur (S) inputs further complicate DOM by creating N-bearing DOM (DON) and S-bearing DOM (DOS). This study delves into the spatial gradients and transformation mechanisms of DOM, DON, and DOS in Pearl River Estuary (PRE) sediments, China, using combined techniques of UV-visible spectroscopy, Excitation-emission matrix (EEM) fluorescence spectroscopy, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), and microbial high-throughput sequencing. Results uncovered a distinct spatial gradient in DOM concentration, aromaticity (SUVA254), hydrophobicity (SUVA260), the content of substituent groups including carboxyl, carbonyl, hydroxyl and ester groups (A253/A203) of chromophoric DOM (CDOM), and the abundances of tyrosine/tryptophan-like protein and humic-like substances in fluorophoric DOM (FDOM). These all decreased from upper to lower PRE, accompanied by a decrease in O3S and O5S components, indicating seaward reduction in the contribution of terrestrial OM, especially anthropogenic inputs. Additionally, sediments exhibited a reduction in molecular diversity (number of formulas) of DOM, DON, and DOS from upper to lower PRE, with molecules tending towards a lower nominal oxidation state of carbon (NOSC) and higher bio-reactivity (MLBL), molecular weight (m/z) and saturation (H/C). While molecular composition of DOM remained similar in PRE sediments, the relative abundance of lignin-like substances decreased, with a concurrent increase in protein-like and lipid-like substances in DON and DOS from upper to lower PRE. Mechanistic analysis identified the joint influence of terrestrial OM, anthropogenic N/S inputs, and microbial processes in shaping the spatial gradients of DOM, DON, and DOS in PRE estuarine sediments. This study contributes valuable insights into the intricate spatial gradients and transformations of DOM, DON, and DOS within human-impacted estuarine sediments.
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Affiliation(s)
- Zhaokui Ni
- Guangdong-Hong Kong Joint Laboratory for Water Security, Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China; Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Kunming 650034, China
| | - Yue Wu
- National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Yu Ma
- Guangdong-Hong Kong Joint Laboratory for Water Security, Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China; College of Water Sciences, Beijing Normal University, Beijing 100875, China
| | - Yu Li
- Guangdong-Hong Kong Joint Laboratory for Water Security, Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China
| | - Dan Li
- College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
| | - Wei Lin
- Guangdong-Hong Kong Joint Laboratory for Water Security, Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China
| | - Shengrui Wang
- Guangdong-Hong Kong Joint Laboratory for Water Security, Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China; College of Water Sciences, Beijing Normal University, Beijing 100875, China
| | - Chunyang Zhou
- Guangdong-Hong Kong Joint Laboratory for Water Security, Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, China.
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Alotayeq A, Ghannay S, Alhagri IA, Ahmed I, Hammami B, E. A. E. Albadri A, Patel H, Messaoudi S, Kadri A, M. Al-Hazmy S, Aouadi K. Synthesis, optical properties, DNA, β-cyclodextrin interaction, hydrogen isotope sensor and computational study of new enantiopure isoxazolidine derivative (ISoXD). Heliyon 2024; 10:e26341. [PMID: 38404822 PMCID: PMC10884473 DOI: 10.1016/j.heliyon.2024.e26341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 02/12/2024] [Accepted: 02/12/2024] [Indexed: 02/27/2024] Open
Abstract
A novel isoxazolidine derivative (ISoXD) dye was successfully synthesized and comprehensively characterized. In this study, we conducted a thorough examination of its various properties, including optical characteristics, interactions with DNA and β-cyclodextrin (β-CD), molecular docking, molecular dynamic simulation, and density functional theory (DFT) calculations. Our investigation encompassed a systematic analysis of the absorption and emission spectra of ISoXD in diverse solvents. The observed variations in the spectroscopic data were attributed to the specific solvent's capacity to engage in hydrogen bonding interactions. Remarkably, the most pronounced intensities were observed in glycol, which can establish many hydrogen bonds with ISoXD. Furthermore, our study revealed a significant distinction in the fluorescence behavior of ISoXD when subjected to different solvents, particularly between CHCl3 and CDCl3. Moreover, we explored the fluorescence intensity of the ISoXD complex in the presence of various metals, both in ethanol and water. The ISoXD complex exhibited a substantial increase of fluorescence upon interaction with different metal ions. The utilization of DFT calculations allowed us to propose an intramolecular charge transfer (ICT) mechanism as a plausible explanation for this quenching phenomenon. The interaction of ISoXD with DNA and β-CD was studied using absorption spectra. The binding constant (K) and the standard Gibbs free energy change (ΔGo) for the interaction between DNA and β-CD with ISoXD were determined. In docking study, ISoXD exhibited significant docking scores (-6.511) and MM-GBSA binding free energies (-66.27 kcal/mol) within the PARP-1 binding cavity. Its binding pattern closely resembles to the co-crystal ligand veliparib, and during a 100ns MD simulation, ISoXD displayed strong stability and formed robust hydrogen bonds with key amino acids. These findings suggest ISoXD's potential as a PARP-1 inhibitor for further investigation in therapeutic development.
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Affiliation(s)
- Afnan Alotayeq
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
| | - Siwar Ghannay
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
| | - Ibrahim A. Alhagri
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
- Department of Chemistry, Faculty of Sciences, Ibb University, Ibb, Yemen
| | - Iqrar Ahmed
- Department of Pharmaceutical Chemistry, Prof. Ravindra Nikam College of Pharmacy, Gondur, Dhule, 424002, India
- Division of Computer Aided Drug Design, Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, 425405, Maharashtra, India
| | - Bechir Hammami
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
| | - Abuzar E. A. E. Albadri
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
| | - Harun Patel
- Division of Computer Aided Drug Design, Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, 425405, Maharashtra, India
| | - Sabri Messaoudi
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
- Faculty of Sciences of Bizerte, Carthage University, Jarzouna, Bizerte 7021, Tunisia
| | - Adel Kadri
- Faculty of Science of Sfax, Department of Chemistry, University of Sfax, B.P. 1171, 3000 Sfax, Tunisia
- Department of Chemistry, Faculty of Science and Arts of Baljurashi, Al- Baha University, Saudi Arabia
| | - Sadeq M. Al-Hazmy
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
| | - Kaiss Aouadi
- Department of Chemistry, College of Science, Qassim University, Buraidah 51452, Saudi Arabia
- Department of Chemistry, Laboratory of Heterocyclic Chemistry Natural Product and Reactivity/CHPNR, Faculty of Science of Monastir, University of Monastir, Avenue of the Environment, Monastir, 5019, Tunisia
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Bashal AH, Al-Refai H, Ibrahim R, Zaki AA. Innovatively feasible wet incipient method for preparing Cu doped TiO 2 nanocomposite: Electro-optical measurement supported by quantitative quantum and classical calculations. Heliyon 2024; 10:e25629. [PMID: 38370228 PMCID: PMC10874733 DOI: 10.1016/j.heliyon.2024.e25629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 01/30/2024] [Accepted: 01/31/2024] [Indexed: 02/20/2024] Open
Abstract
The Cu-doped titanium oxide (Cu/TiO2) nanocomposite was systematically prepared using the innovatively feasible incipient wet impregnation method. Notably, the samples were derived from the raw materials through water dilution only. The successful formation of the host anatase TiO2 phase was confirmed by the characteristic peaks observed in the acquired X-ray powder diffraction (XRD) spectrum, which displayed intense peaks attributed to Cu2+ scattering sites, indicating the formation of crystallite Cu/TiO2 nanostructures. Dielectric measurements revealed that Cu/TiO2 possesses a higher dielectric permittivity compared to undoped TiO2. The conductivity for both structures exhibited a decreasing trend with increasing temperature. Interestingly, the measured optical properties indicated that Cu/TiO2 exhibited the minimum energy gap and maximum refractive index. This was further validated by qualitative time-dependent density functional calculation on a stable structural model, which was confirmed through semi-empirical molecular dynamic calculations. Thus, we have demonstrated the capability of our innovatively feasible synthesis method to produce the industrially important Cu-doped TiO2.
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Affiliation(s)
- Ali H. Bashal
- Department of Chemistry, Faculty of Science, Taibah University, Yanbu, 46423, Saudi Arabia
| | - Hana Al-Refai
- Department of Chemistry, Faculty of Science, Taibah University, Yanbu, 46423, Saudi Arabia
| | - R.M. Ibrahim
- Department of Physics, Faculty of Science, Taibah University, Al-Madinah, 46423, Saudi Arabia
| | - Ayman A. Zaki
- Department of Physics, Faculty of Science, Taibah University, Yanbu, 46423, Saudi Arabia
- Department of Physics, Faculty of Science, Benha University, Egypt
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Ghobashy MM, Sharshir AI, Zaghlool RA, Mohamed F. Investigating the impact of electron beam irradiation on electrical, magnetic, and optical properties of XLPE/Co 3O 4 nanocomposites. Sci Rep 2024; 14:4829. [PMID: 38413685 PMCID: PMC10899620 DOI: 10.1038/s41598-024-55085-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 02/20/2024] [Indexed: 02/29/2024] Open
Abstract
Nowadays, many researchers aim to fill polymer materials with inorganic nanoparticles to enhance the polymer properties and gain the merits of the polymeric host matrix. Sol-gel synthesized Co3O4 nanoparticles are subjected to different doses of electron beam (10, 20, and 30 kGy) to study their physiochemical properties and choose the optimized nanoparticles to fill our polymeric matrix. Crosslinked polyethylene (XLPE) has been filled with 5 wt % of un-irradiated cobalt oxide nanoparticles using the melt extruder method. The structural, optical, magnetic, and electrical properties of the XLPE/Co3O4 nanocomposite before and after exposure to different doses of electron beam radiation have been characterized. The crystallite size of face-centered cubic spinel Co3O4 nanoparticles has been confirmed by XRD whereas and their unique truncated octahedral shape obviously appears in SEM micrographs. The crystallite size of Co3O4 nanoparticles has decreased from 47.5 to 31.5 nm upon irradiation at a dose of 30 kGy, and significantly decreased to 18.5 nm upon filling inside XLPE matrix. Related to the oxidation effect of the electron beam, the Co2+/Co3+ ratio on the surface of Co3O4 nanoparticles has decreased upon irradiation as verified by XPS technique. This consequently caused the partial elimination of oxygen vacancies, mainly responsible for the weak ferromagnetic behavior of Co3O4 in its nanoscale. This appears as decreased saturation magnetization as depicted by VSM. The XLPE/Co3O4 nanocomposite has also shown weak ferromagnetic behavior but the coercive field (Hc) has increased from 112.57 to 175.72 G upon filling inside XLPE matrix and decreased to 135.18 G after irradiating the nanocomposite at a dose of 30 kGy. The ionic conductivity of XLPE has increased from 0.133 × 10-7 to 2.198 × 10-3 S/cm upon filling with Co3O4 nanoparticles while a slight increase is observed upon irradiation.
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Affiliation(s)
- Mohamed Mohamady Ghobashy
- Radiation Research of Polymer Chemistry Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt.
| | - A I Sharshir
- Solid State and Electronic Accelerators Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt.
| | - R A Zaghlool
- Solid State and Electronic Accelerators Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - F Mohamed
- Spectroscopy Department, Physics Research Institute, National Research Centre, 33 El Bohouth St., Dokki, 12622, Giza, Egypt
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22
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Fan X, Xie S, Yu X, Cheng A, Chen D, Ji W, Liu X, Song J, Peng P. Molecular-level transformations of biomass burning-derived water-soluble organic carbon during dark aqueous OH oxidation: Insights from absorption, fluorescence, high-performance size exclusion chromatography and high-resolution mass spectrometry analysis. Sci Total Environ 2024; 912:169290. [PMID: 38104832 DOI: 10.1016/j.scitotenv.2023.169290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 11/16/2023] [Accepted: 12/09/2023] [Indexed: 12/19/2023]
Abstract
Biomass burning (BB) releases large amounts of water-soluble organic carbon (WSOC), which would undergo heterogenous oxidation processes that induce transformations in both molecular structures and compositions within BB WSOC. This study designed an aqueous oxidation initiated by OH radicals in the absence of light for WSOC extracted from smoke particles generated by burning of corn straw and fir wood. The BB WSOC was comprehensively characterized using a combination of UV-visible spectra, excitation-emission matrix fluorescence in conjunction with parallel factor analysis (EEM-PARAFAC), high-performance size exclusion chromatography (HPSEC), and high-resolution mass spectrometry (HRMS) analyses. Over the course of oxidation, both chromophores and fluorophores exhibited gradual decreases. Moreover, EEM-PARAFAC revealed a preferential degradation of larger-sized protein-like/phenol-like organic matters, accompanied by the accumulation and/or formation of humic-like substances in aged BB WSOC. HPSEC analysis showed notable changes in molecular weight (MW) distributions for both types of BB WSOC during oxidation. Specifically, high MW species (>1 kDa) displayed a tendency to form along with oxidation, possibly attributed to the formation of assemblies via intermolecular weak forces. After oxidation, evidence of CHO compound degradation and enrichment/formation of CHON compounds was observed for both types of BB WSOC. Remarkably, the resistant, degraded and produced molecules for BB WSOC were dominated by CHO (38-73 %) and lignin-like molecules (41-47 %), suggesting diverse responses to oxidation within these two groups. Furthermore, polyphenols experienced selective degradation, while CHON, aliphatic and poly-aromatic molecules tended to form during the oxidation process for both types of BB WSOC. In summary, this study provides a comprehensive understanding of the molecular-level transformations undergone by BB WSOC during dark aqueous OH oxidation. The findings significantly contribute to our insights into atmospheric evolution of BB WSOC, thereby playing a crucial role in accurately assessing their effects within climate models and informing policy decisions.
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Affiliation(s)
- Xingjun Fan
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, PR China.
| | - Shuwen Xie
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, PR China
| | - Xufang Yu
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, PR China
| | - Ao Cheng
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, PR China
| | - Dan Chen
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, PR China
| | - Wenchao Ji
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, PR China
| | - Xiaolong Liu
- College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, PR China
| | - Jianzhong Song
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
| | - Pingan Peng
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
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Devaprasad M, Rastogi N, Satish R, Patel A, Dabhi A, Shivam A, Bhushan R, Meena R. Dual carbon isotope-based brown carbon aerosol characteristics at a high-altitude site in the northeastern Himalayas: Role of biomass burning. Sci Total Environ 2024; 912:169451. [PMID: 38143007 DOI: 10.1016/j.scitotenv.2023.169451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 11/10/2023] [Accepted: 12/15/2023] [Indexed: 12/26/2023]
Abstract
PM2.5 samples (n = 34) were collected from January to April 2017 over Shillong (25.7°N, 91.9°E; 1064 m amsl), a high-altitude site situated in the northeastern Himalaya. The main aim was to understand the sources, characteristics, and optical properties of local vs long-range transported carbonaceous aerosols (CA) using chemical species and dual carbon isotopes (13C and 14C). Percentage biomass burning (BB)/biogenic fraction (fbio, calculated from 14C) varied from 67 to 92 % (78 ± 7) and correlated well with primary BB tracers like f60, and K+, suggesting BB as a considerable source. Rain events are shown to reduce the fbio fraction, indicating majority of BB-derived CA are transported. Further, δ13C (-26.6 ± 0.4) variability was very low over Shillong, suggesting it's limitations in source apportionment over the study region, if used alone. Average ratio of absorption coefficient of methanol-soluble BrC (BrCMS) to water-soluble BrC (BrCWS) at 365 nm was 1.8, indicating a significant part of BrC was water-insoluble. A good positive correlation between fbio and mass absorption efficiency of BrCWS and BrCMS at 365 nm with the higher slope for BrCMS suggests BB derived water-insoluble BrC was more absorbing. Relative radiative forcing (RRF, 300 to 2500 nm) of BrCWS and BrCMS with respect to EC were 11 ± 5 % and 23 ± 16 %, respectively. Further, the RRF of BrCMS was up to 60 %, and that of BrCWS was up to 22 % with respect to EC for the samples with fbio ≥ 0.85 (i.e., dominated by BB), reflecting the importance of BB in BrC RRF estimation.
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Affiliation(s)
- M Devaprasad
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India; Indian Institute of Technology, Gandhinagar, Gujarat 382355, India
| | - N Rastogi
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India.
| | - R Satish
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India
| | - A Patel
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India
| | - A Dabhi
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India
| | - A Shivam
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India
| | - R Bhushan
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India
| | - R Meena
- Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India
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Yang X, Liu G, He J, Wei R, Ma M, Xu J, Zhao B, Ru Y, Yang Z, Zhang G. First-principles study of the effects of doping B, N, and O on the photoelectric properties of Cr adsorbed GaS. J Mol Model 2024; 30:75. [PMID: 38376546 DOI: 10.1007/s00894-024-05857-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 01/26/2024] [Indexed: 02/21/2024]
Abstract
CONTEXT To lessen the impact of the dangerous metal Cr, this paper applies the first principles to investigate the adsorption behavior and photoelectric properties of GaS on Cr. The effects of doped GaS on Cr adsorption behavior are investigated with four GaS systems, which are pure, boron (B)-doped, nitrogen (N)-doped, and oxygen (O)-doped, in order to maximize the characteristics of GaS for use in novel sectors, to obtain understanding of the impact of doping on the electronic structure and optical properties of GaS adsorption of Cr, as well as to promote the development of the material. Four GaS adsorbed Cr systems, pure, B-doped, N-doped, and O-doped, are optimized, and the optimized results show that the stable adsorption position of Cr on both pure and doped GaS is the top position of Ga atoms, whereas doped elements B, N, and O can promote the adsorption of Cr on GaS, and the order of the strength of this promotion is B > N > O. METHOD In this paper, molecular simulation calculations and analyses using the CASTEP module in the software Materials Studio are performed to simulate the structure optimization of GaS-adsorbed Cr materials doped with B, N, and O atoms by using the generalized gradient approximation (GGA) plane-wave pseudopotential approach [1] and the Perdew-Burke-Ernzerhof (PBE) generalized function [2]. From the convergence test, it is reasonable to set the K-point network to 4 × 4 × 1 and the truncation energy to 500 eV [3]. In this paper, a 3 × 3 × 1 supercell structure with 18 S atoms and 18 Ga atoms is selected. The convergence value of the iterative accuracy is 1.0e - 5 eV/atom, and all the atomic forces are less than 0.02 eV/Å. A vacuum layer of 16 Å is also set in the C direction to avoid interlayer interactions of GaS. First, we optimize the geometry of the model and then analyze the nature of the adsorption energy and electronic structure corresponding to the model.
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Affiliation(s)
- Xiaotong Yang
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Guili Liu
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China.
| | - Jianlin He
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Ran Wei
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Mengting Ma
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Jingze Xu
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Bingcai Zhao
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Yunfan Ru
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Zhonghua Yang
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenliao Westroad Economic and Technological Development District, No.111, Shenyang, Liaoning, People's Republic of China
| | - Guoying Zhang
- School of Physics, Shenyang Normal University, Shenyang, People's Republic of China
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Alshahrani AM, Lim CH, Wolff MS, Janal MN, Zhang Y. Current speed sintering and high-speed sintering protocols compromise the translucency but not strength of yttria-stabilized zirconia. Dent Mater 2024:S0109-5641(24)00027-7. [PMID: 38378371 DOI: 10.1016/j.dental.2024.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 01/05/2024] [Accepted: 02/12/2024] [Indexed: 02/22/2024]
Abstract
OBJECTIVES To investigate the impacts of speed and high-speed sintering on the densification, microstructure, phase composition, translucency, and flexural strength of yttria-stabilized zirconia (YSZ). METHODS A total of 162 disc-shaped specimens (n = 18) were cold-isostatically pressed from 3YSZ (Zpex), 4YSZ (Zpex 4), and 5YSZ (Zpex Smile) powders (Tosoh Corporation) and sintered according to the following protocols: conventional (control, ∼12 h), speed (∼28 min for 3YSZ; ∼60 min for 4YSZ and 5YSZ), and high-speed (∼18 min) sintering. Dimensions of zirconia specimens after sintering and polishing (1-μm diamond grit finish) were Ø13.75 × 1 mm. Density, microstructure, phase content, translucency parameter, and biaxial flexural strength were evaluated using Archimedes', SEM, XRD, spectrophotometric, and piston-on-3-ball methods, respectively. Data were analyzed with either one-way ANOVA and Tukey's test or Kruskal-Wallis with Dunn's test (α = 0.05). RESULTS For all YSZ compositions, conventional sintering yielded the highest density followed by speed then high-speed sintering. All sintering protocols resulted in similar strength values; however, speed and high-speed sintering protocols afforded significantly lower translucency relative to conventional sintering. XRD analysis revealed similar spectra for YSZs sintered by various protocols. The speed sintered specimens had the smallest grain size whereas the high-speed sintered 5YSZ possessed the largest grain size among all groups. SEM examination of all YSZ compositions revealed that the average pore size was an order of magnitude smaller than the average grain size. SIGNIFICANCE Speed and high-speed sintering of YSZs yield similar strength but diminished density and translucency relative to their conventionally sintered counterparts.
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Affiliation(s)
- Abdulaziz M Alshahrani
- Laboratories for Microstructure Physics & Mechanics of Materials, Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Chek Hai Lim
- Laboratories for Microstructure Physics & Mechanics of Materials, Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Mark S Wolff
- Morton Amsterdam Dean, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Malvin N Janal
- Department of Epidemiology & Health Promotion, New York University College of Dentistry, New York, NY 10010, USA
| | - Yu Zhang
- Laboratories for Microstructure Physics & Mechanics of Materials, Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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26
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Butt AF, Azhar M, Yousaf H, Batoo K, Khan D, Noman M, Chaudhry MU, Naseem S, Riaz S. Chemically processed CdTe thin films for potential applications in solar cells - Effect of Cu doping. Heliyon 2024; 10:e24492. [PMID: 38333808 PMCID: PMC10850418 DOI: 10.1016/j.heliyon.2024.e24492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 12/19/2023] [Accepted: 01/09/2024] [Indexed: 02/10/2024] Open
Abstract
Thin films of cadmium telluride (CdTe) have attained the attention of researchers due to the potential application in solar cells. However, cost-effective fabrication of solar cells based on thin films along with remarkable efficiency and control over optical properties is still a challenging task. This study presents an analysis of the structural, optical and electrical properties of undoped and Cu-doped CdTe thin films fabricated on ITO coated glass substrates using an electrodeposition process with a focus on practical applications. Electrolytes of cadmium (Cd), tellurium (Te) and copper (Cu) are prepared with a low molarity of 0.1 M. Thin films are deposited by keeping current density in the range of 0.12-0.3 mA/cm2. Copper doping is varied (2-10 wt%) for the optimized sample. X-ray diffraction crystallography indicates that both undoped CdTe and Cu-doped CdTe films crystallize into a dominant hexagonal lattice. Direct energy band gap is observed for both undoped and doped conditions. The study revealed a drop in the optical band gap energy to ∼1.46 eV with the increase in doping (Cu) concentration from 2 to 10 wt%. Increase in mobility and conductivity is observed with the increase in current density of the deposited undoped CdTe thin films. Whereas, Cu doping of 6 wt% produced thin films with acceptable mobility and conductivity for the doped samples. Furthermore, photoluminescence (PL) spectroscopy unveiled a multitude of emission peaks encompassing the visible spectrum, arising from the combination of electrons and holes through both direct and indirect recombination processes. Findings of this study suggest that chemically produced CdTe thin films would be suitable for use as low-cost applications pertaining to solar cells.
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Affiliation(s)
- Azqa F. Butt
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore-54590, Pakistan
| | - M. Azhar
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore-54590, Pakistan
| | - Hassan Yousaf
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore-54590, Pakistan
| | - K.M. Batoo
- King Abdullah Institute For Nanotechnology, King Saud University, Riyadh-11451, Saudi Arabia
| | - Dilbar Khan
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore-54590, Pakistan
| | - M. Noman
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore-54590, Pakistan
| | | | - Shahzad Naseem
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore-54590, Pakistan
| | - Saira Riaz
- Centre of Excellence in Solid State Physics, University of the Punjab, Lahore-54590, Pakistan
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Hamdalla TA, Alfadhli S, Khasim S, Darwish A, ElZaidia E, Al-Ghamdi S, Aljohani MM, Mahmoud ME, Seleim SM. Synthesis of novel Cu/Fe based benzene Dicarboxylate (BDC) metal organic frameworks and investigations into their optical and electrochemical properties. Heliyon 2024; 10:e25065. [PMID: 38317972 PMCID: PMC10839998 DOI: 10.1016/j.heliyon.2024.e25065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 01/09/2024] [Accepted: 01/19/2024] [Indexed: 02/07/2024] Open
Abstract
In the recent past Metal-organic frameworks (MOFs) based thin films have demonstrated superior performance in various technological applications such as optical and optoelectronic devices, electrochemical energy storage, catalysis, and sensing. Herein we report tuning the optical performance of stable complexes using Cu and Fe metal ions with carboxylate benzene dicarboxylic (BDC), leading toward the formation of novel MOF structures. The formation of Cu-BDC and Fe-BDC were confirmed by XRD and SEM studies. The thermal stability of two MOFs was investigated, indicating that, the Cu-BDC is more stable than Fe-BDC. Further, the optical properties were investigated in the wavelength range 325-1100 nm, and the Fe-BDC exhibited greater optical transmission properties than Cu-BDC by 33 %, as investigated by Wemple-DiDomenico and Tauc models. The dispersion parameters related to optical studies for Cu-BDC were better in comparison to Fe-BDC, which could be attributed to the increase in Cu valence electrons due to an increase in the number of cations. The electrochemical behavior in terms of CV measurements shows the presence of pseudo capacitance in both Fe-BDC and Cu-BDC MOFs. The improved CV performance of Cu-BDC MOF suggests that it could be used as a storage material. This work successfully demonstrates the tailoring of optical properties related to MOF thin films through the formation of stable complexes using BDC as a potential material for the fabrication of OLED's and Solar cells. The improved CV performance suggests that these MOF based materials could be used as anodes in fabrication of batteries or supercapacitors.
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Affiliation(s)
- Taymour A. Hamdalla
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia
- Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - S. Alfadhli
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia
| | - Syed Khasim
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia
| | - A.A.A. Darwish
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia
| | - E.F.M. ElZaidia
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia
- Department of Physics, Faculty of Education, Ain Shams University, Roxy, 11757, Cairo, Egypt
| | - S.A. Al-Ghamdi
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia
| | - Meshari M. Aljohani
- Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia
| | - Mohamed E. Mahmoud
- Chemistry Department, Faculty of Science, Alexandria University, Ibrahima, 21321, Alexandria, Egypt
| | - Seleim M. Seleim
- Chemistry Department, Faculty of Science, Alexandria University, Ibrahima, 21321, Alexandria, Egypt
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Ghaderi A, Sabbaghzadeh J, Dejam L, Behzadi Pour G, Moghimi E, Matos RS, da Fonseca Filho HD, Țălu Ș, Salehi Shayegan A, Aval LF, Astani Doudaran M, Sari A, Solaymani S. Nanoscale morphology, optical dynamics and gas sensor of porous silicon. Sci Rep 2024; 14:3677. [PMID: 38355956 PMCID: PMC10866982 DOI: 10.1038/s41598-024-54336-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Accepted: 02/12/2024] [Indexed: 02/16/2024] Open
Abstract
We investigated the multifaceted gas sensing properties of porous silicon thin films electrodeposited onto (100) oriented P-type silicon wafers substrates. Our investigation delves into morphological, optical properties, and sensing capabilities, aiming to optimize their use as efficient gas sensors. Morphological analysis revealed the development of unique surfaces with distinct characteristics compared to untreated sample, yielding substantially rougher yet flat surfaces, corroborated by Minkowski Functionals analysis. Fractal mathematics exploration emphasized that despite increased roughness, HF/ethanol-treated surfaces exhibit flatter attributes compared to untreated Si sample. Optical approaches established a correlation between increased porosity and elevated localized states and defects, influencing the Urbach energy value. This contributed to a reduction in steepness values, attributed to heightened dislocations and structural disturbances, while the transconductance parameter decreases. Simultaneously, porosity enhances the strength of electron‒phonon interaction. The porous silicon thin films were further tested as effective gas sensors for CO2 and O2 vapors at room temperature, displaying notable changes in electrical resistance with varying concentrations. These findings bring a comprehensive exploration of some important characteristics of porous silicon surfaces and established their potential for advanced industrial applications.
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Affiliation(s)
- Atefeh Ghaderi
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Jamshid Sabbaghzadeh
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Laya Dejam
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
- Department of Physics, Islamic Azad University, West Tehran Branch, Tehran, Iran
| | - Ghobad Behzadi Pour
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
- Department of Physics, East Tehran Branch, Islamic Azad University, Tehran, 18661-13118, Iran
| | - Emad Moghimi
- Faculty of Physics, Kharazmi University, Tehran, Iran
| | - Robert S Matos
- Amazonian Materials Group, Physics Department, Federal University of Amapá-UNIFAP, Macapá, Amapá, Brazil
| | - Henrique Duarte da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil
| | - Ștefan Țălu
- The Directorate of Research, Development and Innovation Management (DMCDI), The Technical University of Cluj-Napoca, Constantin Daicoviciu Street, No. 15, Cluj-Napoca, 400020, Cluj County, Romania
| | - Amirhossein Salehi Shayegan
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Leila Fekri Aval
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mahdi Astani Doudaran
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Amirhossein Sari
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shahram Solaymani
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran.
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Song L, Chi W, Hao Y, Ren J, Yang B, Cong F, Li Y, Yu L, Li X, Wang Y. Improving the properties of polylactic acid/polypropylene carbonate blends through cardanol-induced compatibility enhancement. Int J Biol Macromol 2024; 258:128886. [PMID: 38141698 DOI: 10.1016/j.ijbiomac.2023.128886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 12/15/2023] [Accepted: 12/17/2023] [Indexed: 12/25/2023]
Abstract
Cardanol (CD) is used as a reactive compatibilizer, and blended with polylactic acid (PLA) and polypropylene carbonate (PPC) resin (70/30(w/w)) to obtain a series of PLA/PPC/CD blends. The systematic study was conducted on the thermal properties, optical properties, rheological properties, mechanical properties, and microscopic morphology of the blend, by varying amounts of CD added to the blends. A detailed explanation and comprehensive analysis of the reaction mechanism between CD and PLA/PPC have been made. The study found that CD acts as a "bridge" between the PLA and PPC, forming the structure of a block copolymer (PLA-b-CD-b-PPC), and the copolymer can greatly improve the compatibility of PLA and PPC. When the amount of CD reaches 8 wt%, only one Tg is observed in the blend, simultaneously, PLA/PPC has already transitioned from a partially compatible system to a completely compatible system. At the same time, the addition of CD does not have any negative impact on the thermal stability of the PLA/PPC blend under processing temperature conditions, and the thermal stability of the PLA/PPC/CD blends can even be improved under extreme conditions. In addition, the addition of CD allows the PLA/PPC/CD blends to maintain a high light transmittance while reducing the opacity of the blend (the light transmittance remains above 92 %, and the opacity is reduced from 37 % to about 24 %), demonstrating excellent optical properties. Moreover, the elongation at break and impact strength of the PLA/PPC/CD blend both show a trend of first increasing and then decreasing with the increase of CD amount. When the CD amount varies within the range of 6- 8 wt%, the blends undergoes a brittle-ductile transition, and its toughness is greatly improved while the rigidity can also meet practical needs. When the amount of CD in the system increases to 12 wt%, the toughness of the blend reaches its peak, and its elongation at break and impact strength reach 513.24 % and 9211.5 J/m2 respectively (increased to 2442.84 % and 270.73 % of the PLA/PPC blend). Concurrently, the fracture surface of the blend exhibits large-scale plastic flow in the direction of the applied force, with marked shear yield phenomena, showing obvious characteristics of tough fracture.
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Affiliation(s)
- Lixin Song
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China.
| | - Weihan Chi
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yongsheng Hao
- College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Jiannan Ren
- AVIC Shenyang Aircraft Corporation, Shenyang 110850, China
| | - Bing Yang
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Fei Cong
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yongchao Li
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Lingxiao Yu
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Xianliang Li
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China; College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yuanxia Wang
- Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China.
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Aumiller M, Arazar A, Sroka R, Dietrich O, Rühm A. Investigations on correlations between changes of optical tissue properties and NMR relaxation times. Photodiagnosis Photodyn Ther 2024; 45:103968. [PMID: 38215958 DOI: 10.1016/j.pdpdt.2024.103968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 01/03/2024] [Accepted: 01/09/2024] [Indexed: 01/14/2024]
Abstract
BACKGROUND Accurate light dosimetry is a complex remaining challenge in interstitial photodynamic therapy (iPDT) for malignant gliomas. The light dosimetry should ideally be based on the tissue morphology and the individual optical tissue properties of each tissue type in the target region. First investigations are reported on using NMR information to estimate changes of individual optical tissue properties. METHODS Porcine brain tissue and optical tissue phantoms were investigated. To the porcine brain, supplements were added to simulate an edema or high blood content. The tissue phantoms were based on agar, Lipoveneous, ink, blood and gadobutrol (Gd-based MRI contrast agent). The concentrations of phantom ingredients and tissue additives are varied to compare concentration-dependent effects on optical and NMR properties. A 3-tesla whole-body MRI system was used to determine T1 and T2 relaxation times. Optical tissue properties, i.e., the spectrally resolved absorption and reduced scattering coefficient, were obtained using a single integrating sphere setup. The observed changes of NMR and optical properties were compared to each other. RESULTS By adjusting the NMR relaxation times and optical tissue properties of the tissue phantoms to literature values, recipes for human brain tumor, white matter and grey matter tissue phantoms were obtained that mimic these brain tissues simultaneously in both properties. For porcine brain tissue, it was observed that with increasing water concentration in the tissue, both NMR-relaxation times increased, while µa decreased and µs' increased at 635 nm. The addition of blood to porcine brain samples showed a constant T1, while T2 shortened and the absorption coefficient at 635 nm increased. CONCLUSIONS In this investigation, by changing sample contents, notable changes of both NMR relaxation times and optical tissue properties have been observed and their relations examined. The developed dual NMR/optical tissue phantoms can be used in iPDT research, clinical training and demonstrations.
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Affiliation(s)
- Maximilian Aumiller
- Laser-Forschungslabor, LIFE Center, LMU University Hospital, LMU Munich, Planegg 82152, Germany; Department of Urology, LMU University Hospital, LMU Munich, Munich 81377, Germany.
| | - Asmerom Arazar
- Laser-Forschungslabor, LIFE Center, LMU University Hospital, LMU Munich, Planegg 82152, Germany
| | - Ronald Sroka
- Laser-Forschungslabor, LIFE Center, LMU University Hospital, LMU Munich, Planegg 82152, Germany; Department of Urology, LMU University Hospital, LMU Munich, Munich 81377, Germany
| | - Olaf Dietrich
- Department of Radiology, LMU University Hospital, LMU Munich, Munich 81377, Germany
| | - Adrian Rühm
- Laser-Forschungslabor, LIFE Center, LMU University Hospital, LMU Munich, Planegg 82152, Germany; Department of Urology, LMU University Hospital, LMU Munich, Munich 81377, Germany
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31
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P K JS, Shah M, Pradyumnan PP. Intense narrow band blue emission in CuCrO 2 delafossite by Ni 2+-Mg 2+ dual cation doping. Spectrochim Acta A Mol Biomol Spectrosc 2024; 305:123442. [PMID: 37778173 DOI: 10.1016/j.saa.2023.123442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Revised: 06/15/2023] [Accepted: 09/20/2023] [Indexed: 10/03/2023]
Abstract
For applications involving LED lighting and displays, phosphor materials with narrow emission bands are quite riveting. CuCrO2 is a well-known delafosste for optoelectronic device applications due to its wide bandgap, and high emission at short wavelengths. Here we tried emission band tuning of CuCrO2 by Ni2+ on 0.5 wt% Mg doped CuCrO2 crystallites. The photoluminescence spectra (PL) are observed when excited with 373 nm radiation, indicating that it had a strong blue emission peak at 423 nm with FWHM of 18.26 nm and good color purity of 91.32%. Rietveld refinement of XRD spectra and Raman investigation conveyed a considerable structural variation with Ni2+ doping and band gap decrement by UV-Vis analysis. In Raman studies, shifting of signature peaks and additional defect-induced peaks are observed, manifesting desired microstructural changes, and the UV-Vis absorption investigation revealed marginal decay of the optical band gap from 3.31 eV to 2.63 eV. Refractive index has also been determined from the UV-Vis analysis and their values substantiate the results.
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Affiliation(s)
| | - Midhun Shah
- Department of Physics, University of Calicut, Malappuram, India; Department of Physics, Farook College, Kozhikode, India
| | - P P Pradyumnan
- Department of Physics, University of Calicut, Malappuram, India.
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32
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Wu B, Wu Z, Yao Z, Shen X, Cao X. Refined mass absorption cross-section of black carbon from typical non-road mobile machinery in China based on real-world measurements. Sci Total Environ 2024; 908:168579. [PMID: 37967631 DOI: 10.1016/j.scitotenv.2023.168579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/10/2023] [Accepted: 11/12/2023] [Indexed: 11/17/2023]
Abstract
Non-road mobile machinery (NRMM) is becoming a more prominent contribution of black carbon (BC), and mass absorption cross-section (MAC) as an essential parameter to characterize the BC optical property is still not clear. In this study, we explored the impacts of key factors on the MAC of BC based on real-world measurements from 41 typical NRMM. We characterized the organic carbon (OC) and elemental carbon (EC), and found MAC values of BC from NRMM increase as the OC/EC mass ratios increase, since the OC coating can enhance BC light absorption. With more stringent emission standards, the MAC values of all tested NRMM show a significant decreasing trend. Meanwhile, we found the absorption coefficients obtained by filter-based (bfilter) and in-situ-based (bin-situ) methods present good correlation for NRMM in this study, but bfilter are significantly higher than bin-situ when bfilter are above 40,000 Mm-1. Furthermore, we have refined the MAC values under different emission standards, and recommended a more appropriate MAC value (11.5 ± 3.4 m2/g) of NRMM at 550 nm wavelength, which is 1.5 times of the MAC value (7.5 m2/g) commonly used in previous studies. Our results will be indispensable for accurate BC quantification from NRMM and climate radiative effects prediction.
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Affiliation(s)
- Bobo Wu
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
| | - Zichun Wu
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China
| | - Zhiliang Yao
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China.
| | - Xianbao Shen
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
| | - Xinyue Cao
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
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Purushothaman P, Karpagam S. Thiophene derived sky-blue fluorescent probe for the selective recognition of mercuric ion through CHEQ mechanism and application in real time samples. Spectrochim Acta A Mol Biomol Spectrosc 2024; 305:123518. [PMID: 37847933 DOI: 10.1016/j.saa.2023.123518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 10/04/2023] [Accepted: 10/09/2023] [Indexed: 10/19/2023]
Abstract
A vibrant blue organic luminescent material with enhanced photophysical properties is in great demand for the generation of optoelectronic devices and luminescent sensors. In this context, the thiophene-benzimidazole probe TH-IMI was designed and synthesized by a simple condensation reaction. The synthesized probe has shown excellent photophysical properties like high FL intensity, a high quantum yield of 90% in the solution phase, a low optical bandgap of 2.84 eV, positive solvatochromic effect in emission spectra and Disaggregation Caused Quenching Effect (DCQE). Such a high luminescent probe was employed for the recognition of mercuric ions in the solution phase, solid state detection, and in tracking mercury in green gram sprouts. UV-visible absorption and emission spectra, 1H NMR titration, IR spectroscopic and ESI-MS techniques confirmed that the probe underwent a fluorescence quenching response via the CHEQ effect upon exposure to Hg2+. The stoichiometry was found to be 1:1 through Job's plot and has a fast response rate and relatively low limit of detection of about 6.13 × 10-11 M in a linear range between 0 and 110 µL.
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Affiliation(s)
- Palani Purushothaman
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore 14, Tamil Nadu, India
| | - Subramanian Karpagam
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore 14, Tamil Nadu, India.
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Safa AN, Sheibani A, Baei MT, Sayyed-Alangi SZ, Tazikeh Lemeski E. Theoretical and experimental studies on sulfasalazine interactions with poly (lactic acid): Impact of hydrogen bonding and charge transfer interactions on molecular structure, electronic and optical properties. Heliyon 2024; 10:e23813. [PMID: 38205338 PMCID: PMC10776989 DOI: 10.1016/j.heliyon.2023.e23813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/10/2023] [Accepted: 12/13/2023] [Indexed: 01/12/2024] Open
Abstract
The interaction between sulfasalazine (SSZ) through different functional groups and poly (lactic acid) (PLA) in the chloroform phase was investigated in this study using density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods. The binding energy and thermodynamic parameters show that the hydrogen double bond interaction between SSZ and PLA in state I (-0.71 eV) is stronger than in states II (-0.64 eV) and III (-0.51 eV). The SSZ and PLA interaction results in an enhanced dipole moment, greater solubility, and more negative values for Gibbs free energy (ΔGsolv) and energy gap (Eg). Considerable changes in absorption peaks of SSZ and PLA indicate surface adsorption of the drug (SSZ) into the carrier (PLA) in UV-Vis spectra. Theoretical UV-Vis analysis demonstrates SSZ interaction with PLA happens in the ultraviolet region with a maximum absorption peak at 380 nm, which is close to experimental UV-Vis analysis. The experimental spectra showed minimal variations in the maximum absorption wavelength, with respect to theoretical calculations. The presence of SSZ was found to cause a modification in the structure of PLA, as evidenced by both experimental and theoretical Infrared (IR) spectra.
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Affiliation(s)
- Azam Naderi Safa
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
| | - Ali Sheibani
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
| | - Mohammad T. Baei
- Department of Chemistry, Azadshahr Branch, Islamic Azad University, Azadshahr, Golestan, Iran
| | - S. Zahra Sayyed-Alangi
- Department of Chemistry, Azadshahr Branch, Islamic Azad University, Azadshahr, Golestan, Iran
| | - E. Tazikeh Lemeski
- Department of Chemistry, Gorgan Branch, Islamic Azad University, Gorgan, Iran
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Yang N, Wang Y, Ji J, Shi Z, Liu G, Zhang G. First-principles study of the electronic structure and optical properties of C-doped SnS 2. J Mol Model 2024; 30:35. [PMID: 38206357 DOI: 10.1007/s00894-024-05835-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Accepted: 01/04/2024] [Indexed: 01/12/2024]
Abstract
CONTEXT Density functional theory (DFT) was used to investigate the effects of varying carbon doping concentrations on the electronic and optical properties of SnS2-doped systems. The findings show that a doping concentration of 3.7% in SnS2 results in the highest structural stability and the lowest formation energy. A pure SnS2 monolayer is an indirect bandgap semiconductor, and the result reveals that increasing carbon doping correlates with a gradual reduction in the system's bandgap. The density of states analysis reveals that the valence band comprises C-2p, S-3p, and Sn-5p orbitals, whereas the conduction band consists of S-3p, Sn-5 s, and C-2p orbitals. Furthermore, doping concentration appears to cause a redshift in both the absorption coefficient and reflection peaks, which both decrease as doping concentration increases. METHODS The calculations for this study were performed using DFT within the CASTEP module of Materials Studio Segall et al. J Phys: Condens Matter 14(11):2717, 2002. The system parameters and structures were optimized to determine the electronic structure and optical properties. Geometric optimization and calculations were carried out with the generalized gradient approximation plane-wave pseudopotential method and the Perdew-Burke-Ernzerhof functional Perdew et al. Phys Rev Lett 80(4):891-891, 1998. The parameters for structural optimization included a plane-wave expansion cutoff energy set at 500 eV and a k-point mesh of 6 × 6 × 1 for Brillouin zone integration. The electronic convergence criteria were established at 1.0 × 10-5 eV/atom for the unit cell energy and 1.0 × 10-6 eV/atom for self-consistency. The internal stress deviation was maintained below 0.05 GPa, the atomic force interactions were kept under 0.03 eV/Å, and atomic displacements during geometric optimization were confined to less than 0.001 Å. To calculate the properties of the SnS2 monolayer, a vacuum spacing of 15 Å along the z-axis was introduced to prevent interactions between adjacent layers.
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Affiliation(s)
- Nan Yang
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Ying Wang
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China.
| | - Jinghan Ji
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Zhihong Shi
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Guili Liu
- College of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Guoying Zhang
- College of Physical Science and Technology, Shenyang Normal University, Shenyang, 110034, China
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Allan L, Mulwa WM, Mapasha RE, Mwabora JM, Musembi RJ. First principle study of ATiO[Formula: see text] (A=Ti,Sr) materials for photovoltaic applications. J Mol Model 2024; 30:32. [PMID: 38197994 PMCID: PMC10781837 DOI: 10.1007/s00894-023-05823-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 12/28/2023] [Indexed: 01/11/2024]
Abstract
CONTEXT The study investigates the impact of Hubbard U correction and spin-orbit coupling (SOC) on the structural, mechanical, electronic, and optical properties of Ti[Formula: see text]O[Formula: see text] and SrTiO[Formula: see text] compounds. The research is motivated by the potential applications of these materials in photovoltaics, with a focus on understanding their properties for such use. The ductility, ionicity, and mechanical stability of both compounds at zero pressure are assessed, indicating their potential as resilient materials. Also, the compounds display high refractive indices and absorption coefficients, indicating their suitability for solar harvesting applications. The predicted bandgaps align primarily with the UV-Vis areas of the electromagnetic spectrum, highlighting their potential in this domain. METHODS Computational techniques employed in this study are density functional theory (DFT) with and without spin-orbit coupling, as well as DFT+U methods, implemented using the Quantum ESPRESSO (QE) package. The study adopts the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional, while employing a plane-wave basis set with an energy cutoff of 50 Ry for wavefunctions and 500 Ry for charge density.
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Affiliation(s)
- Lynet Allan
- Department of Physics, Faculty of Science and Technology, University of Nairobi, P.O.Box 30197-00100, Nairobi, Kenya.
| | - Winfred M Mulwa
- Department of Physics, Egerton University, P.O Box 536-20115, Egerton, Kenya
| | - R E Mapasha
- Department of Physics, University of Pretoria, Private Bag x 20, Hatfield, Republic of South Africa
| | - Julius M Mwabora
- Department of Physics, Faculty of Science and Technology, University of Nairobi, P.O.Box 30197-00100, Nairobi, Kenya
| | - Robinson J Musembi
- Department of Physics, Faculty of Science and Technology, University of Nairobi, P.O.Box 30197-00100, Nairobi, Kenya
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Ghazy AR, Al-Hossainy AF, Abdel Gawad SA. Enhancing the optical properties of [P(MMA-co-AN)/ZrO 2] TF by doping fluorescein dye, TD-DFT/DMOl 3 simulations and COVID-19 main protease docking. Spectrochim Acta A Mol Biomol Spectrosc 2024; 304:123411. [PMID: 37741102 DOI: 10.1016/j.saa.2023.123411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 08/18/2023] [Accepted: 09/12/2023] [Indexed: 09/25/2023]
Abstract
Poly methyl methacrylate-co-acrylonitrile [P(MMA-co-AN)]HB hybrid blend was first synthesized by precipitation polymerization and characterized by static light scattering. With a thickness of 200 ± 5 nm, the hybrid nanocomposite of [P(MMA-co-AN)/ZrO2]HNC thin films were fabricated by spin coating method. X-Ray diffraction studies showed a monoclinic cell structure with an average crystalline size of 180 nm for the fabricated films. An improvement in the optical properties were figured out when fluorescein dye was doped in the hybrid nanocomposite. Where the optical energy gap was decreased from 4.31 to 4.025 eV for fluorescein doped hybrid nanocomposite. While a possible energy transfer between ZrO2 and fluorescein was investigated in the laser photoluminescence spectra. DFT-CASTEP simulations were deployed to calculate the theoretical optical properties for the molecules under consideration. The structural and optical simulations of [P(MMA-co-AN)/ZrO2]HNC were found to match the experimental data. Molecular docking studies of [P(MMA-co-AN)/ZrO2]Iso against the main protease of novel corona virus COVID 19 (PDB code 6LU7 Hormone) showed an interesting interaction.
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Affiliation(s)
- Ahmed R Ghazy
- Laser Laboratory, Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt.
| | - Ahmed F Al-Hossainy
- Chemistry Department, Faculty of Science, New Valley University, 72511 Al-Wadi Al-Gadid, Al-Kharga, Egypt
| | - S A Abdel Gawad
- Basic Science Center, Misr University for Science and Technology (MUST), 6 of October, Egypt
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Akouibaa A, Akouibaa A, Masrour R, Benhamou M, Rezzouk A. Numerical study of a D-shaped optical fiber SPR biosensor for monitoring refractive index variations in biological tissue via a thin layer of gold coated with titanium dioxide. Spectrochim Acta A Mol Biomol Spectrosc 2024; 304:123358. [PMID: 37699326 DOI: 10.1016/j.saa.2023.123358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/17/2023] [Accepted: 09/04/2023] [Indexed: 09/14/2023]
Abstract
This study aims to explore the numerical analysis of the impact of integrating titanium oxide (TiO2) into a D-shaped optical fiber biosensor based on surface plasmon resonance (SPR). A thin layer of gold (Au) is applied to the flat section of the fiber, which is also coated with a thin layer of titanium dioxide (TiO2). The behavior and performance of the proposed biosensor for use in biological environments are evaluated using the finite element method (FEM). The optical response of SPR-based biosensors is highly dependent on the analyzed medium, enabling the detection of pathogenic cells and abnormalities in biological tissues. This provides high sensitivity and selectivity, as well as real-time detection accuracy and speed. In this study, the biosensor is incorporated into a biological medium with a refractive index that varies with wavelength. A series of simulations have been conducted to plot the spectra of transmissions, absorptions, and dielectric losses obtained in the output of the sensor instrument. From these spectra, the corresponding surface plasmon resonance (SPR) wavelength (λSPR) within the visible-near-infrared band can be determined. Taking into account the various parameters that influence plasmonic interactions, the biosensor's performance parameters, in particular sensitivity and refractive index resolution have been optimized. Our results show that the presence of the TiO2 layer improves the performance of the proposed sensor and offers the possibility of adjusting the resonance wavelength (λSPR). In addition, our proposed sensor can achieve a better resolution of 7.50×10-6[RIU] in 1.34-143 range of analyte refractive index, which notably exceeds that of current technologies. This opens up new prospects in the field of chemical and biological detection.
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Affiliation(s)
- Ahmed Akouibaa
- Laboratory of Solid Physics, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, BP 1796 Fez, Morocco
| | - Abdelilah Akouibaa
- LPPSMM, Physics Department, Faculty of Sciences Ben M'Sik, Hassan II University Casablanca, P.O. Box 7955, Casablanca, Morocco
| | - Rachid Masrour
- Laboratory of Solid Physics, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, BP 1796 Fez, Morocco.
| | - Mabrouk Benhamou
- Dynamics of Complex Systems Team, Physics Department, Faculty of Sciences, Moulay Ismail University, P.O. Box 11201, Meknes, Morocco
| | - Abdellah Rezzouk
- Laboratory of Solid Physics, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, BP 1796 Fez, Morocco
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Li X, YujuanSun, Zhu X. Preparation of Chiral Carbon Quantum Dots and its Application. J Fluoresc 2024; 34:1-13. [PMID: 37199894 DOI: 10.1007/s10895-023-03262-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/08/2023] [Indexed: 05/19/2023]
Abstract
Chiral carbon quantum dots (cCQDs) , as a new type of carbon nano-functional material with tunable emission wavelength, superior photostability, low toxicity, biocompatibility and chirality, are playing an increasingly important role in the fields of chemistry, biology and medicine. This paper reviews the preparation methods (one-step and two-step), optical properties (UV, fluorescence, chirality) and applications in chiral catalysis, chiral recognition, targeted imaging as well as other fields, while lists some of the issues and challenges in the research of chiral carbon quantum dots. Finally, due to its good fluorescence and other properties, it is expected that chiral carbon quantum dots will have broad commercial prospects in future applications.
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Affiliation(s)
- Xiang Li
- College of Chemistry and Chemical Engineering, College of Guangling, Yangzhou University, 225002, Yangzhou, China
| | - YujuanSun
- College of Chemistry and Chemical Engineering, College of Guangling, Yangzhou University, 225002, Yangzhou, China
| | - Xiashi Zhu
- College of Chemistry and Chemical Engineering, College of Guangling, Yangzhou University, 225002, Yangzhou, China.
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Liu X, Mo Z, Cui L, Yu C, Zou Z, Liu Y, Zheng W, Tan J. Effect of biaxial stretching on the microstructure evolution, optical, mechanical and oxygen barrier properties of biodegradable poly(lactic acid) (PLA)/poly(butylene adipate-co-terephthalate) (PBAT) films. Int J Biol Macromol 2023; 253:126976. [PMID: 37739283 DOI: 10.1016/j.ijbiomac.2023.126976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 09/12/2023] [Accepted: 09/16/2023] [Indexed: 09/24/2023]
Abstract
The poly(butylene adipate-co-terephthalate) (PBAT)/poly(lactic acid) (PLA) films have been widely used due to their biological degradability and excellent comprehensive properties. However, the reports regarding biodegradable PLA/PBAT films are rather scarce. In this work, systematical investigations of biaxially stretched PLA/PBAT films were performed. Compared with unstretched films, the PLA/PBAT 75/25 films with the stretching ratio of 5 × 1 exhibited an improvement on the crystallinity of PLA from 6 % to 58.6 %. According to 2D-WAXS results, the orientation of the α crystal in the MD increased with the increase of the stretching ratio. The stretched films showed favorable barrier properties. The oxygen permeability (OP) of 2 × 2 PLA/PBAT 75/25 films shows a decrement of 22 % compared with that of the unstretched films. Interestingly, the uniaxially stretched PLA/PBAT 75/25 films exhibits increased surface roughness (Ra) for 3 × 1 film whereas decreased Ra for the 5 × 1 film, which could be related to the phase separation under stretching. The tensile strength in the machine direction (MD) of the PLA/PBAT 75/25 films was improved up to 51.6 MPa for 5 × 1 film, which is 45 % higher than that of unstretched counterpart. The stretched films exhibit excellent mechanical and barrier properties, which could be utilized in packaging industry with high potential.
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Affiliation(s)
- Xiaochao Liu
- College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412000, China
| | - Zhixiang Mo
- College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412000, China
| | - Lingna Cui
- College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412000, China.
| | - Chongdong Yu
- College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412000, China
| | - Zhenyu Zou
- College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412000, China
| | - Yuejun Liu
- College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412000, China.
| | - Wei Zheng
- Xiamen Changsu Industrial Co. Ltd., Xiamen 361000, China
| | - Jin Tan
- Hunan Green Star Biotechnology Co. Ltd., Zhuzhou 412000, China
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Hansen A, Kraus T, Landon M, McMahon P. Spectral characterization of dissolved organic matter in groundwater to assess mixing with oil-field water near selected oil fields, southern California. Sci Total Environ 2023; 905:166970. [PMID: 37699489 DOI: 10.1016/j.scitotenv.2023.166970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 09/05/2023] [Accepted: 09/08/2023] [Indexed: 09/14/2023]
Abstract
Samples of oil-field water (oil wells, injectate, disposal ponds) and groundwater near selected oil and gas fields in southern California were analyzed for dissolved organic carbon (DOC) concentration and by optical spectroscopic techniques (i.e., absorbance and fluorescence) to assess whether these measurements can be used to distinguish between oil-field water (Oil Field), native groundwater (WGnat), and native groundwater mixed with oil-field water from surface (WGsurf) or subsurface sources (WGsub), and if so whether commonly reported optical measurements can be used as a screening tool to identify such water. Concentrations of DOC were significantly (p < 0.0001) higher (67 to 2934 mg C L-1) in oil-field water compared to native groundwater samples (<5.0 mg C L-1). Individual optical properties varied by water category and frequently overlapped. However, multivariate statistical analysis showed that when evaluated in combination, 10 optical properties were determined by discriminant analysis to be significant (p < 0.05) in distinguishing among water categories. Principal component analysis of those 10 optical properties showed that these properties can be used to successfully distinguish Oil Field samples from WGnat, WGsurf, and WGsub even when mixing fractions are low (approximately 10 %).
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Affiliation(s)
- Angela Hansen
- US Geological Survey, 6000 J Street, Placer Hall, Sacramento, CA 95819, United States.
| | - Tamara Kraus
- US Geological Survey, 6000 J Street, Placer Hall, Sacramento, CA 95819, United States
| | - Matthew Landon
- US Geological Survey, 4165 Spruance Road, Suite 200, San Diego, CA 92101, United States
| | - Peter McMahon
- US Geological Survey, Denver Federal Center, Bldg 95, Lakewood, CO 80225, United States
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Noudem P, Fouejio D, Mveme CDD, Nya FT, Zekeng SS. Electronic, nonlinear optical, UV-vis and NBO analysis of methyl methacrylate for optoelectronic and optical applications: DFT study and impact of conformation. Spectrochim Acta A Mol Biomol Spectrosc 2023; 303:123267. [PMID: 37598450 DOI: 10.1016/j.saa.2023.123267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 07/24/2023] [Accepted: 08/15/2023] [Indexed: 08/22/2023]
Abstract
Using Density Functional Theory (DFT) and time-dependent DFT (TD-DFT), we studied a compound widely used in daily life, namely: Methyl Methacrylate (MMA) monomer in its two stable isomers, cis-MMA and trans-MMA. The impact of conformation on the optical and electronic properties of MMA was highlighted. Structural parameters and thermodynamic properties were also assessed, and allowed to discuss the stability and reactivity of this compound. In addition, analysis of optoelectronic and electronic properties, global reactivity descriptors, natural bond orbital (NBO), and hole and electron reorganization energies was performed. The absorption and fluorescence properties, as well as the linear and nonlinear optical (NLO) properties of MMA were also investigated. The findings show that MMA is an insulator due to its wide band gap of 6.20 eV. It also exhibits good optoelectronic properties with high average electric field values of about 5.90 × 109 Vm-1 for cis-MMA and 5.42 × 109 Vm-1 for trans-MMA and high electric displacement values of at least 14.65 × 10-2 cm-2 for cis-MMA and 14.33 × 10-2 cm-2 for trans-MMA, suggesting a potential use for the design of piezoelectric and pyroelectric materials. In addition, trans-MMA has a dielectric constant close to that of good insulators; while cis-MMA exhibits a dielectric behaviour close to that of polymeric substances. Further, these materials are thermodynamically stable in its two conformations, with a good reactivity which can lead to good ability of polymerization. The analysis of the UV-vis spectra revealed that both forms of MMA absorb and emit mainly in the UV and that the Stokes shift of MMA is low, reducing its potential use in devices such as solar cells. At NLO level, MMA isomers exhibit weak optical properties such as second- and third-order optical susceptibility and cannot suitable for second and third harmonic generation; however, the conformation enhances second-order NLO response by at least 2 times when moving from cis- to trans-MMA, whereas the third-order response is almost unaffected. In addition, the conformation also affects the electronic and optoelectronic properties of MMA.
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Affiliation(s)
- P Noudem
- Mechanic, Materials and complex structures Laboratory, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - D Fouejio
- Mechanic, Materials and complex structures Laboratory, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon.
| | - C D D Mveme
- Materials Science Laboratory, Department of Physics, Faculty of Science, University of Maroua, P.O. Box 814, Maroua, Cameroon
| | - F Tchangnwa Nya
- Materials Science Laboratory, Department of Physics, Faculty of Science, University of Maroua, P.O. Box 814, Maroua, Cameroon
| | - S S Zekeng
- Mechanic, Materials and complex structures Laboratory, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
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Liu S, Cui Z, Ding D, Bai Y, Chen J, Cui H, Su R, Qu K. Effect of the molecular weight of DOM on the indirect photodegradation of fluoroquinolone antibiotics. J Environ Manage 2023; 348:119192. [PMID: 37827075 DOI: 10.1016/j.jenvman.2023.119192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/16/2023] [Accepted: 09/27/2023] [Indexed: 10/14/2023]
Abstract
Dissolved organic matter (DOM) is ubiquitous and widespread in natural water and influences the transformation and removal of antibiotics. Nevertheless, the influence of DOM molecular weight (MW) on the indirect photodegradation of antibiotics has rarely been reported. This study attempted to explore the influence of the molecular weight of DOM on the indirect photodegradation of two fluoroquinolone antibiotics (FQs), ofloxacin (OFL) and norfloxacin (NOR), by using UV-vis absorption and fluorescence spectroscopy. The results showed that indirect photodegradation was considered the main photodegradation pathway of FQs in DOM fractions. Triplet-state excited organic matter (3DOM*) and singlet oxygen (1O2) were the main reactive intermediates (RIs) that affected the indirect photodegradation of FQs. The indirect photodegradation rate of FQs was significantly promoted in DOM fractions, especially in the low molecular weight DOM fractions (L-MW DOM, MW < 10 kDa). The results of excitation-emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC) showed that terrestrial humic-like substances had a higher humification degree and fluorophore content in L- MW DOM fractions, which could produce more 3DOM* and 1O2 to promote the indirect photodegradation of FQs. This study provided new insight into the effects of DOM at the molecular weight level on the indirect photodegradation of antibiotics in natural water.
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Affiliation(s)
- Shukai Liu
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, Shandong, 266071, China; Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China
| | - Zhengguo Cui
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, Shandong, 266071, China
| | - Dongsheng Ding
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, Shandong, 266071, China
| | - Ying Bai
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, Shandong, 266071, China.
| | - Jianlei Chen
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, Shandong, 266071, China
| | - Hongwu Cui
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China
| | - Rongguo Su
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China.
| | - Keming Qu
- State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, Shandong, 266071, China
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Tan JH, Lin YY, Liu QJ, Liu FS, Liu ZT, Yang X. Structural, electronic, and optical properties of three types Ca 3N 2 from first-principles study. J Mol Model 2023; 30:9. [PMID: 38093144 DOI: 10.1007/s00894-023-05804-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Accepted: 12/04/2023] [Indexed: 01/11/2024]
Abstract
CONTEXT To find the potential value of Ca3N2 in the field of optoelectronics, the physical properties of Ca3N2 will be analyzed. It can be concluded from the electronic properties that the Ca-N bonds of α-Ca3N2 are more stable than those of δ-Ca3N2 and ε-Ca3N2. The dielectric function, reflectivity function, and absorption function of three types of Ca3N2 were accurately calculated, and it was concluded that α-Ca3N2, δ-Ca3N2, and ε-Ca3N2 have greater transmittance for visible light and exhibit optical transparency in the near-infrared frequency domain. Combined with the high hardness, strong bonding, high melting point, and wear resistance of Ca3N2, Ca3N2 can be used as a new generation of window heat-resistant materials. The α-Ca3N2, δ-Ca3N2, and ε-Ca3N2 are indirect, direct, and indirect narrow bandgap compounds, respectively, that is, δ-Ca3N2 is more suitable for luminescent materials than α-Ca3N2 and ε-Ca3N2. α-Ca3N2 and δ-Ca3N2 have high reflective properties in the ultraviolet region and can be used as UV protective coatings. All three Ca3N2 materials can be used industrially to synthesize photovoltaic devices that operate in the ultraviolet region. METHODS Based on the first-principles of density functional theory calculations, the structures, electronic properties, and optical properties of α-Ca3N2, δ-Ca3N2, and ε-Ca3N2 were calculated. The calculation results show that although the α-Ca3N2, δ-Ca3N2, and ε-Ca3N2 have similar electronic structures, some phases have better properties in some aspects.
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Affiliation(s)
- Jia-Hao Tan
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Yong-Yi Lin
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Qi-Jun Liu
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Fu-Sheng Liu
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Zheng-Tang Liu
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, People's Republic of China
| | - Xue Yang
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China.
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Wei X, Yang L, Sun S, Zhao Y, Liu H. Strain-induced effects on the optoelectronic properties of ZrSe 2/HfSe 2 heterostructures. J Mol Model 2023; 30:3. [PMID: 38082191 DOI: 10.1007/s00894-023-05793-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Accepted: 11/23/2023] [Indexed: 01/11/2024]
Abstract
CONTEXT Two-dimensional semiconductor materials have received much attention in recent years due to their wide variety of applications in the field of nano-optoelectronic devices. In this project, we applied stresses ranging from -6 to +6% to the ZrSe2/HfSe2 heterostructure and systematically investigated its electrical and optical properties. It is discovered that stress can effectively modulate the forbidden bandwidth of the ZrSe2/HfSe2 heterojunction; whereas, under compressive stress, the forbidden bandwidth of the material decreases further until the bandgap is zero, leading to the material's transformation from semiconductor to metal. The forbidden band gap of the ZrSe2/HfSe2 heterojunction increases with increasing horizontal biaxial tensile strain. We discovered that the light absorption performance of this heterostructure is significantly better than that of its similar monomolecular layer and that its light absorption intensity can reach an order of magnitude of 104. Under compressive and tensile stresses, the ZrSe2/HfSe2 heterojunctions exhibit different degrees of red or blue shift. The results indicate that constructing ZrSe2/HfSe2 heterojunctions and applying horizontal biaxial stresses to them can significantly modulate the optoelectronic properties of the materials. ZrSe2/HfSe2 heterojunction is a new type of high-performance photogenerated carrier transport device with a wide range of applications. METHODS The calculations in this study are carried out the first principles approach of density functional theory, as implemented in the CASTEP module of Materials-Studio2019. The researchers used an ultrasoft reaction potential to calculate the interactions between the ion core and the electrons and applied the Perdew-Burke-Ernzerhof (PBE) and the generalized gradient approximation (GGA) to perform the calculations. The Monkhorst-Pack technique was employed to create the k-point samples utilized for integration on the Brillouin zone, and the k-point grid was uniformly 6 × 6 × 1. In addition, in order to avoid interactions between the atomic layers affecting the properties and stability of the material, such interactions were prevented by adding a 30 Å vacuum layer. Using a plane-wave energy cutoff of 500 eV and the convergence accuracy of the iterative process was set to 1 × 10-5 eV to ensure the accuracy of the computational results, and in addition. The maximum stress in the lattice was limited to less than 0.05 GPa or the interaction force between neighboring atoms was lower than 0.03 eV/Å. For the calculation of the properties of the optical properties, a k-point grid of 18 × 18 × 1 is used for optimization, and the polarization direction of the material is not taken into account, considering that the material is isotropic. This study proposes to apply the Tkatchenko-Scheffler (TS) dispersion correction method in DFT-D to appropriately represent the interlayer van der Waals interaction forces to solve inaccuracies in the computation of van der Waals interactions via density functional theory.
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Affiliation(s)
- Xingbin Wei
- School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Lu Yang
- School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China.
| | - Shihang Sun
- School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Yanshen Zhao
- School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
| | - Huaidong Liu
- School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, 110870, China
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Kumar M, Vijayalakshmi RP, Ratnakaram YC. Investigation of emission characteristics in Er 3+- doped bismuth phosphate glasses for NIR laser materials. Spectrochim Acta A Mol Biomol Spectrosc 2023; 302:123096. [PMID: 37451209 DOI: 10.1016/j.saa.2023.123096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 05/20/2023] [Accepted: 06/29/2023] [Indexed: 07/18/2023]
Abstract
Bismuth flourophosphate glasses doped with Er3+ ions (0.5 mol %) were synthesized using different modifier fluorides with the aid of melt quenching route. The glass samples were labelled as PBiBaAFT (where AF = Li, Na, Mg, K, Ca and Sr fluorides). The influence of cations of network modifiers on the structure and thereby spectroscopic properties of Er3+ ions was analysed via Powder XRD, FTIR, optical absorption and photoluminescence. Existence of relevant vibrational groups and modifications in structure due to the different admixture modifier cations were recognized via FTIR spectra. The Judd-Ofelt parameters abide by the trend Ω2 > Ω6 > Ω4 in the PBiBaLiT, PBiBaKT, PBiBaCaTand PBiBaSrT glasses whereas the trend was noticed to be Ω2 > Ω4 > Ω6 for PBBiNaT and PBiBaMgT glasses respectively. The visible emission spectra were recorded by exciting at 379 nm exhibit three emission bands centered at 526 nm, 544 nm and 686 nm. NIR emission spectra were recorded by exciting at 980 nm exhibit broad emission at 1535 nm. Admixture of different cations could exhibit change in luminescence intensity and radiative parameters of the prepared glasses. Spectroscopic parameters such as radiative transition probability (A), branching ratio (β), absorption cross section (∑), effective bandwidth (Δλeff) and optical band gain (σe × Δλeff) are calculated. The mid infrared spectroscopic features were investigated.
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Affiliation(s)
- M Kumar
- Department of Physics, Sri Venkateswara University, Tirupati 517502, A.P, India.
| | - R P Vijayalakshmi
- Department of Physics, Sri Venkateswara University, Tirupati 517502, A.P, India
| | - Y C Ratnakaram
- Department of Physics, Sri Venkateswara University, Tirupati 517502, A.P, India
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Hussain A, Mian SA, Ahmed E, Jang J. Orchestrating the impact of antisites and vacancy defects on the elastic and optoelectronic properties of boron arsenide. J Mol Model 2023; 29:393. [PMID: 38041727 DOI: 10.1007/s00894-023-05791-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Accepted: 11/20/2023] [Indexed: 12/03/2023]
Abstract
CONTEXT Cubic boron arsenide (c-BAs), a semiconducting material with ultra-high thermal conductivity and carrier mobilities, has been studied using first-principles calculation. This study examined the elastic and optoelectronic properties of c-BAs. The challenge of subphase boron (B) formation in bulk form owing to the volatile nature of arsenic (As) makes it mandatory to calculate its optoelectronic properties, by producing vacancies and antisite defects with BAs (As atom on a B site) and AsB (B atom on an As site). The mechanical properties including bulk (B), shear (G) moduli, and Poison's ratio of all the systems were studied. It was found that mechanical instability of the structure is observed for the overall vacancy creation, arsenic substitution, and mutual antisite defects. Further, pristine c-BAs showed an indirect bandgap of 1.48 eV. Defect formation reduces the bandgap and shifts the absorption peaks, which improves the overall optoelectronic properties of the host material. In addition, B vacancy formation shows the maximum optical absorption and reflectivity and low energy loss, suggesting its potential applications for optoelectronic devices. The obtained anticipated data from this study is for the optoelectronic and elastic properties of c-BAs, for the device applications in photonics and electronics. METHOD In this paper, the elastic and optoelectronic properties of the pristine and defected c-BAs were systematically investigated using the Spanish Initiative for Electronic Simulations with Thousands of Atoms (SIESTA). The SIESTA program uses pseudopotentials in the norm-conserving nonlocal forms and pseudo-atomic orbital (PAO) basis set with a double-zeta potential (DZP) which are fundamental for calculating the Hamiltonian and overlap matrices in O(N) operations.
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Affiliation(s)
- Akbar Hussain
- Department of Physics, University of Peshawar, Peshawar, Pakistan
| | | | - Ejaz Ahmed
- Department of Physics, Abdul Wali Khan University Mardan, Mardan, Pakistan
| | - Joonkyung Jang
- Department of Nano Energy Engineering, Pusan National University, Busan, Republic of Korea.
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Gupt U, Premkumar HB, Nunez JPJ, Mallick J, Hadimani RL, Kar M, Dayal V, Prabhu TN. Exploring Optically Stable Reddish-Orange Fluorescent Magnetic Pigment (0.90)Y 2O 3:(0.10-x)Eu 3+:(x)Bi 3+ for Anti-counterfeiting Applications. J Fluoresc 2023:10.1007/s10895-023-03520-9. [PMID: 38041793 DOI: 10.1007/s10895-023-03520-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Accepted: 11/15/2023] [Indexed: 12/03/2023]
Abstract
The (0.90)Y2O3:(0.10-x)Eu3+:(x)Bi3+ nanophosphors (0.00 ≤ x ≤ 0.06) are synthesised using chemical combustion citrate route and characterized via X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, UV- visible and photoluminescence spectroscopy. The scanning electron micrographs indicate that the grain size of the phosphors ranges between 40 to 50 nm. The photoluminescence (PL) spectra, acquired under the excitation wavelength of 365 nm of ultraviolet light, show emission peaks at wavelengths 580 nm, 586-598 nm, 610 nm, 629-661 nm and 686-695 nm corresponding to the 5D0 → 7FJ electronic transitions of the Eu3+ ion with J = 0, 1, 2, 3 and 4, respectively. The most intense PL spectra at 611 nm (5D0 → 7F2), showcasing reddish-orange emission, indicate a higher concentration of Eu3+ ions in asymmetric sites within the Y2O3 host matrix. The presence of the distinct electronic transitions of Eu3+ in PL spectra acclaims that Bi3+ ions transfer their energy efficiently to Eu3+ ions in the matrix. Physical and chemical tests are being conducted on nanophosphors with Bi3+ substitutional doping of x = 0.02 and x = 0.04, both demonstrating intense PL emission. Magnetisation measurements suggest the soft magnetic nature of the nanophosphors, attributing it to the presence of Eu3+ ions in the 7F2 state. The highest PL intensity is seen in the nanophosphor (x = 0.04) with substitutional doping of 6% of Eu3+ and 4% of Bi3+ in Y2O3. This nanophosphor also demonstrates excellent optical stability in the investigated conditions and exhibits soft magnetic behaviour, positioning it as a promising material for incorporation as a fluorescent magnetic pigment in security ink applications. These features serve to prevent counterfeiting of secured documents both optically and magnetically.
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Affiliation(s)
- Udayan Gupt
- Department of Chemistry, Faculty of Mathematical and Physical Sciences, M S Ramaiah University of Applied Sciences, Bengaluru, 560058, India
| | - H B Premkumar
- Department of Physics, Faculty of Mathematical and Physical Sciences, M S Ramaiah University of Applied Sciences, Bengaluru, 560058, India.
| | - John Peter J Nunez
- Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, 23285, USA
| | - Jyotirekha Mallick
- Department of Physics, Indian Institute of Technology-Patna, Patna, Bihar, 801106, India
| | - Ravi L Hadimani
- Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, 23285, USA
| | - Manoranjan Kar
- Department of Physics, Indian Institute of Technology-Patna, Patna, Bihar, 801106, India
| | - Vijaylakshmi Dayal
- Department of Physics, Maharaja Institute of Technology Mysore (Affiliated to Visvesvaraya Technological University, Belagavi), Mandya, 571477, Karnataka, India.
| | - T Niranjana Prabhu
- Department of Chemistry, Faculty of Mathematical and Physical Sciences, M S Ramaiah University of Applied Sciences, Bengaluru, 560058, India.
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Mittal H, Raza M, Khanuja M. Liquid phase exfoliation of MoSe 2: Effect of solvent on morphology, edge confinement, bandgap and number of layers study. MethodsX 2023; 11:102409. [PMID: 37928106 PMCID: PMC10622839 DOI: 10.1016/j.mex.2023.102409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 09/27/2023] [Indexed: 11/07/2023] Open
Abstract
In this study, a facile and scalable method for synthesizing MoSe2 nanomaterial via a sonication-assisted liquid-phase exfoliation method is proposed. This study shows the successful synthesis of few-layered MoSe2 in various solvents including DI water, ethanol, N-Methyl-2-pyrrolidone (NMP), Dimethylformamide (DMF) and Dimethylsulfoxide (DMSO). The exfoliated nanosheets have remarkably different properties than bulk MoSe2 which were studied using Field emission scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and UV-Vis spectroscopy to investigate their morphology, functional groups, structure and optical properties, respectively. The mean values of the number of layers from an optical extinction spectrum based on the effect of edge and quantum confinement were also calculated. Moreover, the exfoliated material using this method has potential application in energy storage as demonstrated by the electrochemical performance of the bulk and exfoliated materials.•Successful synthesis of the few-layer MoSe2 from bulk MoSe2 using liquid phase exfoliation method in various solvents•The investigation of the effect of solvent on the number of layers and optical properties of MoSe2.
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Affiliation(s)
- Honey Mittal
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia, New Delhi 110025, India
| | - Maryam Raza
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia, New Delhi 110025, India
| | - Manika Khanuja
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia, New Delhi 110025, India
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El Ghazali A, Aboulouard A, Gultekin B, Tounsi A, El Idrissi M. Theoretical investigation of novel electron donors for bulk heterojunction solar cells with potential photovoltaic characteristics. J Mol Graph Model 2023; 125:108622. [PMID: 37690428 DOI: 10.1016/j.jmgm.2023.108622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 08/22/2023] [Accepted: 08/31/2023] [Indexed: 09/12/2023]
Abstract
Engineering electronic organic donor materials are one of the most critical steps in producing bulk-heterojunction solar cells (BHJ) with good photovoltaic properties. Compared to standard donor materials, electron donors derived from thiophene have made significant progress as they can be better suited for optoelectronics and are cheaper and more stable. Therefore, the use of new thiophene derivatives (M1-M4) as donor molecules in BHJs has been the subject of this extensive theoretical analysis. Density functional theory (DFT) and time-dependent DFT (TD-DFT) computations have been used to investigate the boundary molecular orbital (FMO) analysis, the density of states analysis, electron and hole reorganization energy, molecular electrostatic potential, global reactivity parameters, and photovoltaic properties. The effects of end-donor modifications on the photovoltaic and electronic characteristics of the new molecules (M1-M4) are investigated. According to the results, the molecules have good optical properties, a small band gap, a perfect open-circuit voltage, and a good alignment energy level between the designated donor molecules and the acceptor phenyl-C61-butyric acid methyl ester (PCBM). These results suggest that further research in this area could enhance the efficacy of organic solar cells.
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Affiliation(s)
- Ahlam El Ghazali
- ERCAM, Polydisciplinary Faculty, Sultan Moulay Slimane University, Beni-Mellal, Morocco
| | - Abdelkhalk Aboulouard
- Department of Physics, Sultan Moulay Slimane University, Beni-Mellal, Morocco; Department of Engineering Sciences, Izmir Katip Celebi University, Izmir, Turkey; Solar Energy Institute, Ege University, TR-35100, Izmir, Turkey; Graphene Application and Research Center, Izmir Katip Celebi University, Izmir, Turkey.
| | - Burak Gultekin
- Solar Energy Institute, Ege University, TR-35100, Izmir, Turkey
| | - Abdessamad Tounsi
- ERCAM, Polydisciplinary Faculty, Sultan Moulay Slimane University, Beni-Mellal, Morocco
| | - Mohammed El Idrissi
- TCPAM, Polydisciplinary Faculty, Sultan Moulay Slimane University, Beni-Mellal, Morocco.
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