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Zong H, Gao M, Ul Hassan Mohsan A, Lin Y, Zhou Y, Yu L, Zhao S, Li Y, Zhang J. Effect of static pressure on ultrasonic liquid phase exfoliation of few-layer graphene. ULTRASONICS SONOCHEMISTRY 2024; 105:106863. [PMID: 38579571 PMCID: PMC11004987 DOI: 10.1016/j.ultsonch.2024.106863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 03/24/2024] [Accepted: 03/28/2024] [Indexed: 04/07/2024]
Abstract
Ultrasonic Liquid Phase Exfoliation (LPE) has gathered attention from both scientific and industrial communities for its accessibility and cost-effectiveness in producing graphene. However, this technique has faced challenges such as low yield and long production time. In this study, we developed a cyclic ultrasonication system to exfoliate expanded graphite (EG) by applying static pressure to a flow chamber to address these challenges. Using deionized water (DIW) as solvent and polyvinylpyrrolidone (PVP) as dispersion, we obtained graphene slurries with an average lateral size of 7 μm and averaged number of layers of 3.5 layers, after 40 min of ultrasonication. After centrifugation, the yield of single and bilayer graphene was approximately 16 %. The findings showed that regulating hydrostatic pressure can effectively affect the lateral size and number of layers of few-layer graphene. The proposed method is of good potential for scaled-up production of few-layer graphene.
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Affiliation(s)
- Hu Zong
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Minhui Gao
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Aziz Ul Hassan Mohsan
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Yibiao Lin
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Ying Zhou
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
| | - Lei Yu
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Su Zhao
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
| | - Yifei Li
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Jiahao Zhang
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
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Saebi MR, Moradinezhad F, Ansarifar E. Quality preservation and decay reduction of minimally processed seedless barberry fruit via postharvest ultrasonic treatment. Food Sci Nutr 2023; 11:7816-7825. [PMID: 38107101 PMCID: PMC10724632 DOI: 10.1002/fsn3.3698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/31/2023] [Accepted: 09/04/2023] [Indexed: 12/19/2023] Open
Abstract
Seedless barberry fruit is one of the important horticultural products of Iran, which has health benefits due to great amounts of phenolic compounds, flavonoids, and antioxidant activity. However, fresh barberry fruit has a short shelf life even at cold storage, mainly due to high water content and thin skin that leads to fungal decay and high postharvest loss. We examined the effectiveness of the postharvest ultrasonic technology on the quality preservation and nutritional value of fresh seedless barberry fruit and their decay reduction during cold storage. Experimental treatments were the time and temperature of ultrasound (US) and included: (1) control, fruit without US, (2) 5 min US at 20°C, (3) 5 min US at 30°C, (4) 5 min US at 40°C, (5) 10 min US at 20°C, (6) 10 min US at 30°C, (7) 10 min US at 40°C, (8) 15 min US at 20°C, (9) 15 min US at 30°C, and (10) 15 min US at 40°C. After applying the treatments, the fruits were sealed in polyethylene bags and stored at 4 ± 1°C for 20 days. The results showed that all US treatments had higher titratable acidity, antioxidant activity, phenol content, and vitamin C content than the control. However, the highest titratable acidity and antioxidant activity values were obtained in US treatments at 40°C and 30°C for 15 min. Also, US treatment significantly reduced the total soluble solids, decay percentage, and microbial load of fresh barberry fruit. As the US treatment temperature increased from 20°C to 40°C, the decay and microbial load of fruit significantly decreased. In conclusion, this study proved the potential application of the US for preserving the quality of fresh seedless barberry fruit, and the most optimal US temperature and its application time was 40°C for 15 min.
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Affiliation(s)
- Mohammad Reza Saebi
- Department of Horticultural Science, Faculty of AgricultureUniversity of BirjandBirjandIran
| | - Farid Moradinezhad
- Department of Horticultural Science, Faculty of AgricultureUniversity of BirjandBirjandIran
| | - Elham Ansarifar
- Department of Public Health, School of Health, Social Determinants of Health Research CenterBirjand University of Medical ScienceBirjandIran
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Yasui K. The Reducing Agents in Sonochemical Reactions without Any Additives. Molecules 2023; 28:molecules28104198. [PMID: 37241940 DOI: 10.3390/molecules28104198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/10/2023] [Accepted: 05/18/2023] [Indexed: 05/28/2023] Open
Abstract
It has been experimentally reported that not only oxidation reactions but also reduction reactions occur in aqueous solutions under ultrasound without any additives. According to the numerical simulations of chemical reactions inside an air or argon bubble in water without any additives under ultrasound, reducing agents produced from the bubbles are H, H2, HO2 (which becomes superoxide anion (O2-) in liquid water), NO, and HNO2 (which becomes NO2- in liquid water). In addition, H2O2 sometimes works as a reducing agent. As the reduction potentials of H and H2 (in strongly alkaline solutions for H2) are higher than those of RCHOH radicals, which are usually used to reduce metal ions, H and H2 generated from cavitation bubbles are expected to reduce metal ions to produce metal nanoparticles (in strongly alkaline solutions for H2 to work). It is possible that the superoxide anion (O2-) also plays some role in the sonochemical reduction of some solutes. In strongly alkaline solutions, hydrated electrons (e-aq) formed from H atoms in liquid water may play an important role in the sonochemical reduction of solutes because the reduction potential is extremely high. The influence of ultrasonic frequency on the amount of H atoms produced from a cavitation bubble is also discussed.
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Affiliation(s)
- Kyuichi Yasui
- National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
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4
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Ultrasound frequency sonication facilitates high-throughput and uniform dissociation of cellular aggregates and tissues. SLAS Technol 2023; 28:70-81. [PMID: 36642327 DOI: 10.1016/j.slast.2023.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 12/08/2022] [Accepted: 01/01/2023] [Indexed: 01/15/2023]
Abstract
A sample preparation step involving dissociation of tissues into their component cells is often required to conduct analysis of nucleic acids and other constituents from tissue samples. Frequently, the extracellular matrix and cell-cell adhesions are disrupted via treatment with a chemical dissociating reagent or various mechanical forces. In this work, a new, high-throughput, multiplexed method of dissociating tissues and cellular aggregates into single cells using ultrasound frequency bath sonication is explored and characterized. Different operating parameters are evaluated, and a treatment protocol with potential for uniform, high-throughput tissue dissociation is compared to the existing best chemical and orbital plate shaking protocol. Metrics such as percent dissociation, cellular recovery, average aggregate size, proportion of various aggregate sizes, membrane circularity, and cellular viability are subsequently assessed and found to be favorable. In optimized conditions, 53 ± 8% of 1 mm biopsy cores are dissociated within 30 min using sonication alone, surpassing leading high-throughput orbital plate shaking techniques five-fold. Chemical digestion is also 2 times more effective when complexed with sonication rather than orbital plate shaking. RNA content, quality, and expression are found to be superior to the standard protocol in terms of transcriptional preservation.
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5
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Bezerra JDA, Sanches EA, Lamarão CV, Campelo PH. Ultrasound and effect on the surface hydrophobicity of proteins: a meta‐analysis. Int J Food Sci Technol 2022. [DOI: 10.1111/ijfs.15774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Jaqueline de Araújo Bezerra
- Analytical Center Campus Manaus Center Federal Institute of Education, Science and Technology of Amazonas Manaus Brazil
| | - Edgar Aparecido Sanches
- Laboratory of Nanostructured Polymers (NANOPOL) Federal University of Amazonas Manaus Brazil
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Development of Carboxymethyl Chitosan Nanoparticles Prepared by Ultrasound-Assisted Technique for a Clindamycin HCl Carrier. Polymers (Basel) 2022; 14:polym14091736. [PMID: 35566905 PMCID: PMC9106027 DOI: 10.3390/polym14091736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/19/2022] [Accepted: 04/23/2022] [Indexed: 11/22/2022] Open
Abstract
Polymeric nanoparticles are one method to modify the drug release of small hydrophilic molecules. In this study, clindamycin HCl was used as a model drug loaded in carboxymethyl chitosan nanoparticles cross-linked with Ca2+ ions (CMCS-Ca2+). The ultrasonication with experimental design was used to produce CMCS-Ca2+ nanoparticles loading clindamycin HCl. The model showed that the size of nanoparticles decreased when amplitude and time increased. The nanoparticle size of 318.40 ± 7.56 nm, decreased significantly from 543.63 ± 55.07 nm (p < 0.05), was obtained from 75% of amplitude and 180 s of time, which was one of the optimal conditions. The clindamycin loading content in this condition was 34.68 ± 2.54%. The drug content in nanoparticles showed an inverse relationship with the size of the nanoparticles. The sodium carboxymethylcellulose film loading clindamycin HCl nanoparticles exhibited extended release with 69.88 ± 2.03% drug release at 60 min and a gradual increase to 94.99 ± 4.70% at 24 h, and demonstrated good antibacterial activity against S. aureus and C. acne with 40.72 ± 1.23 and 48.70 ± 1.99 mm of the zone of inhibition at 24 h, respectively. Thus, CMCS-Ca2+ nanoparticles produced by the ultrasound-assisted technique could be a potential delivery system to modify the drug release of small hydrophilic antibiotics.
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Deagglomeration of spray-dried submicron particles by low-power aqueous sonication. ADV POWDER TECHNOL 2022. [DOI: 10.1016/j.apt.2022.103543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Unraveling agglomeration and deagglomeration in aqueous colloidal dispersions of very small tin dioxide nanoparticles. J Colloid Interface Sci 2022; 608:2681-2693. [PMID: 34838316 DOI: 10.1016/j.jcis.2021.10.194] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/29/2021] [Accepted: 10/31/2021] [Indexed: 12/16/2022]
Abstract
HYPOTHESIS Understanding deagglomeration, agglomerate formation and structure for very small nanoparticles (NPs), due to their more facile agglomeration, is critical for processing or tailoring agglomerates for nanostructured materials. We propose that by controlling and fine-tuning the interplay of agglomeration (colloidal interaction) and deagglomeration (hydrodynamic forces), the design of agglomerate size, microstructure and morphology is possible even for very small NPs. EXPERIMENTS Here, we investigate very small SnO2 NPs (10 nm) generated in the gas phase as model system. Small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) are used to study dispersions in aqueous media across the entire pH range (2-12) at various NaCl concentrations treated with ultrasound. Parallel to size and size distribution, agglomerate morphology and microstructure are analyzed by means of the mass fractal dimension, dm and modeled with ab initio shape simulations. The critical coagulation concentration (CCC) is determined for the alkaline region where the SnO2 NPs are highly charged. FINDINGS Quantitative analysis of SAXS and DLS data reveals that size and size distribution of the agglomerates depend similarly on the electrostatic interaction influenced by pH and salinity as observed by the zeta potential. In contrast dm is mainly influenced by the salt concentration. Ab initio shape simulations support these experimental findings.
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PVP/Highly Dispersed AgNPs Nanofibers Using Ultrasonic-Assisted Electrospinning. Polymers (Basel) 2022; 14:polym14030599. [PMID: 35160588 PMCID: PMC8840217 DOI: 10.3390/polym14030599] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 01/28/2022] [Accepted: 02/01/2022] [Indexed: 02/05/2023] Open
Abstract
Silver nanoparticles (AgNPs) are novel materials with antibacterial, antifungal, and antiviral activities over a wide range. This study aimed to prepare polyvinylpyrrolidone (PVP) electrospinning composites with uniformly distributed AgNPs. In this study, starch-capped ~2 nm primary AgNPs were first synthesized using Atmospheric pressure Pulsed Discharge Plasma (APDP) at AC 10 kV and 10 kHz. Then, 0.6 wt.% AgNPs were mixed into a 10 wt.% PVP ethanol-based polymer solution and coiled through an Ultrasonic-assisted Electrospinning device (US-ES) with a 50 W and 50 kHz ultrasonic generator. At 12 kV and a distance of 10 cm, this work successfully fabricated AgNPs-PVP electrospun fibers. The electrospun products were characterized using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), High-Resolution TEM (HR-TEM), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Thermogravimetric (TG), and X-ray Photoelectron Spectroscopy (XPS) methods.
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Wang X, Zhang Z, Wu G, Xu C, Wu J, Zhang X, Liu J. Applications of electrochemical biosensors based on functional antibody-modified screen-printed electrodes: a review. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 14:7-16. [PMID: 34877580 DOI: 10.1039/d1ay01570b] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The detection of biomolecular analytes is of great importance in clinical, environmental, and argo-food areas, among which the electrochemical methodology is attracting much attention. In particular, screen-printed electrode (SPE)-based sensing applications have exhibited potential possibility for on-site detection, especially for fast clinical biomarker detection, since they provide a miniaturized but robust and portable electrode detection system. In this context, we focused on the modification of SPE with functional antibodies to improve the electrochemical detection performance in versatile sensing applications, particularly for COVID-19 detection. These antibodies were immobilized onto the electrode surface via various methodologies, through which the powerful potential from the modification of SPE was revealed. Finally, more novel and excellent works on the biomolecular modification of SPE and the prospects of this technology from its state-of-art status to commercialization are previewed and future perspectives in this field are mentioned.
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Affiliation(s)
- Xuyao Wang
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Zhenqi Zhang
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Guolin Wu
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Chunxia Xu
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Jianping Wu
- Department of Clinical Laboratory, Zhejiang University School of Medicine First Affiliated Hospital, Hangzhou, Zhejiang, 310003, P. R. China
| | - Xingguo Zhang
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Jian Liu
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
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11
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The Influence of Sonication Processing Conditions on Electrical and Mechanical Properties of Single and Hybrid Epoxy Nanocomposites Filled with Carbon Nanoparticles. Polymers (Basel) 2021; 13:polym13234128. [PMID: 34883631 PMCID: PMC8659569 DOI: 10.3390/polym13234128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/14/2021] [Accepted: 11/15/2021] [Indexed: 12/04/2022] Open
Abstract
Graphene nanoplatelets (GNP) and carbon nanotubes (CNT) are used to enhance electrical and mechanical properties of epoxy-based nanocomposites. Despite the evidence of synergetic effects in the hybrid GNP-CNT-epoxy system, there is still a lack of studies that focus on the influence of different dispersion methods on the final properties of these ternary systems. In the present work, direct and indirect ultrasonication methods were used to prepare single- and hybrid-filled GNP-CNT-epoxy nanocomposites, varying the amplitude and time of sonication in order to investigate their effect on electrical and thermomechanical properties. Impedance spectroscopy was combined with rheology and electron microscopy to show that high-power direct sonication tends to degrade electrical conductivity in GNP-CNT-epoxy nanocomposites due to damage caused in the nanoparticles. CNT-filled samples were mostly benefitted by low-power direct sonication, achieving an electrical conductivity of 1.3 × 10−3 S·m−1 at 0.25 wt.% loading, while indirect sonication was not able to properly disperse the CNTs and led to a conductivity of 1.6 ± 1.3 × 10−5. Conversely, specimens filled with 2.5 wt. % of GNP and processed by indirect sonication displayed an electrical conductivity that is up to 4 orders of magnitude higher than when processed by direct sonication, achieving 5.6 × 10−7 S·m−1. The introduction of GNP flakes improved the dispersion state and conductivity in hybrid specimens processed by indirect sonication, but at the same time impaired these properties for high-power direct sonication. It is argued that this contradictory effect is caused by a selective localization of shorter CNTs onto GNPs due to strong π-π interactions when direct sonication is used. Dynamic mechanical analysis showed that the addition of nanofillers improved epoxy’s storage modulus by up to 84%, but this property is mostly insensitive to the different processing parameters. Decrease in crosslinking degree and presence of residual solvent confirmed by Fourier-transform infrared spectroscopy, however, diminished the glass transition temperature of the nanocomposites by up to 40% when compared to the neat resin due to plasticization effects.
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12
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Li M, Zhang Y, Wang Z, Tan P, Liu X, Zhang D, Li G, Xie J, Zhou H. Microstructure evolutions in lithium ion battery electrode manufacturing. CHINESE SCIENCE BULLETIN-CHINESE 2021. [DOI: 10.1360/tb-2021-1069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Tang Z, Song D, Ma W, Zhang X. Two-level synergistic scatterings from porosity and particle aggregation in Cu nanofluids for the enhancement of solar thermal conversion. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Priyadarshi A, Khavari M, Subroto T, Prentice P, Pericleous K, Eskin D, Durodola J, Tzanakis I. Mechanisms of ultrasonic de-agglomeration of oxides through in-situ high-speed observations and acoustic measurements. ULTRASONICS SONOCHEMISTRY 2021; 79:105792. [PMID: 34666238 PMCID: PMC8524947 DOI: 10.1016/j.ultsonch.2021.105792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 09/27/2021] [Accepted: 10/12/2021] [Indexed: 05/24/2023]
Abstract
Ultrasonic de-agglomeration and dispersion of oxides is important for a range of applications. In particular, in liquid metal, this is one of the ways to produce metal-matrix composites reinforced with micron and nano sized particles. The associated mechanism through which the de-agglomeration occurs has, however, only been conceptualized theoretically and not yet been validated with experimental observations. In this paper, the influence of ultrasonic cavitation on SiO2 and MgO agglomerates (commonly found in lightweight alloys as reinforcements) with individual particle sizes ranging between 0.5 and 10 μm was observed for the first time in-situ using high-speed imaging. Owing to the opacity of liquid metals, a de-agglomeration imaging experiment was carried out in de-ionised water with sequences captured at frame rates up to 50 kfps. In-situ observations were further accompanied by synchronised acoustic measurements using an advanced calibrated cavitometer, to reveal the effect of pressure amplitude arising from oscillating microbubbles on oxide de-agglomeration. Results showed that ultrasound-induced microbubble clusters pulsating chaotically, were predominantly responsible for the breakage and dispersion of oxide agglomerates. Such oscillating cavitation clusters were seen to capture the floating agglomerates resulting in their immediate disintegration. De-agglomeration of oxides occurred from both the surface and within the bulk of the aggregate. Microbubble clusters oscillating with associated emission frequencies at the subharmonic, 1st harmonic and low order ultra-harmonics of the driving frequency were deemed responsible for the breakage of the agglomerates.
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Affiliation(s)
- Abhinav Priyadarshi
- Faculty of Technology, Design and Environment, Oxford Brookes University, Oxford OX33 1HX, United Kingdom.
| | - Mohammad Khavari
- Faculty of Technology, Design and Environment, Oxford Brookes University, Oxford OX33 1HX, United Kingdom
| | - Tungky Subroto
- Brunel Centre for Advance Solidification Technology (BCAST), Brunel University London, Uxbridge UB8 3PH, United Kingdom
| | - Paul Prentice
- Cavitation Laboratory, School of Engineering, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Koulis Pericleous
- Computational Science and Engineering Group (CSEG), Department of Mathematics, University of Greenwich, London SE10 9LS, United Kingdom
| | - Dmitry Eskin
- Brunel Centre for Advance Solidification Technology (BCAST), Brunel University London, Uxbridge UB8 3PH, United Kingdom; Tomsk State University, Tomsk 634050, Russia
| | - John Durodola
- Faculty of Technology, Design and Environment, Oxford Brookes University, Oxford OX33 1HX, United Kingdom
| | - Iakovos Tzanakis
- Faculty of Technology, Design and Environment, Oxford Brookes University, Oxford OX33 1HX, United Kingdom; Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
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15
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Zhang Y, Zhang A, Li M, He K, Guo S. Nanoparticle-loaded microcapsules providing effective UV protection for Cry1Ac. J Microencapsul 2021; 38:522-532. [PMID: 34615422 DOI: 10.1080/02652048.2021.1990424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AIM To prepare several novel microcapsules using chitosan (Cs) and Alginate (Alg) as coating materials, and nano-ZnO, nano-SiO2, nano-TiO2 as UV protective agents for improving UV resistance of Cry1Ac. METHODS Microcapsules were prepared by the layer-by-layer (LbL) self-assembly technique and electrostatic adsorption. The morphologies were observed by scanning electron microscopy (SEM), and the stability under UV radiation was studied by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and bioassay. RESULTS SEM showed that nano-ZnO and nano-TiO2 could be adsorbed on the negatively charged MC with the outermost layer being Alg, while nano-SiO2 could be adsorbed on the positively charged MC with Cs as the outermost layer. SDS-PAGE and bioassay showed that nano-ZnO and nano-SiO2 could provide effective UV protection after 8 h UV irradiation (p > 0.05), and nano-TiO2 could provide effective UV protection after 4 h UV irradiation (p > 0.05). CONCLUSION The microcapsules loaded with nanoparticles provided excellent UV resistance for Cry1Ac.
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Affiliation(s)
- Yongjing Zhang
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Aijing Zhang
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Mengyuan Li
- School of Life Science, Beijing Institute of Technology, Beijing, China
| | - Kanglai He
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Shuyuan Guo
- School of Life Science, Beijing Institute of Technology, Beijing, China
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16
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McHardy C, Djike Kammegne T, Jänich I. Energy-efficient ultrasound-assisted extraction of food proteins from the microalga C. vulgaris at elevated static pressure. INNOV FOOD SCI EMERG 2021. [DOI: 10.1016/j.ifset.2021.102797] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Ruiz-Hitzky E, Ruiz-García C, Fernandes FM, Lo Dico G, Lisuzzo L, Prevot V, Darder M, Aranda P. Sepiolite-Hydrogels: Synthesis by Ultrasound Irradiation and Their Use for the Preparation of Functional Clay-Based Nanoarchitectured Materials. Front Chem 2021; 9:733105. [PMID: 34485248 PMCID: PMC8414812 DOI: 10.3389/fchem.2021.733105] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 08/02/2021] [Indexed: 12/18/2022] Open
Abstract
Sepiolite and palygorskite fibrous clay minerals are 1D silicates featuring unique textural and structural characteristics useful in diverse applications, and in particular as rheological additives. Here we report on the ability of grinded sepiolite to generate highly viscous and stable hydrogels by sonomechanical irradiation (ultrasounds). Adequate drying of such hydrogels leads to low-density xerogels that show extensive fiber disaggregation compared to the starting sepiolite—whose fibers are agglomerated as bundles. Upon re-dispersion in water under high-speed shear, these xerogels show comparable rheological properties to commercially available defibrillated sepiolite products, resulting in high viscosity hydrogels that minimize syneresis. These colloidal systems are thus very interesting as they can be used to stabilize many diverse compounds as well as nano-/micro-particles, leading to the production of a large variety of composites and nano/micro-architectured solids. In this context, we report here various examples showing how colloidal routes based on sepiolite hydrogels can be used to obtain new heterostructured functional materials, based on their assembly to solids of diverse topology and composition such as 2D and 1D kaolinite and halloysite aluminosilicates, as well as to the 2D synthetic Mg,Al-layered double hydroxides (LDH).
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Affiliation(s)
| | - Cristina Ruiz-García
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
| | - Francisco M Fernandes
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Laboratoire de Chimie de la Matière Condensée de Paris, Faculté de Sciences, Sorbonne Université, Paris, France
| | - Giulia Lo Dico
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,IMDEA Materials Institute, Getafe, Spain
| | - Lorenzo Lisuzzo
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Dipartimento di Fisica e Chimica - Emilio Segrè, Università degli Studi di Palermo, Palermo, Italy
| | - Vanessa Prevot
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Université Clermont Auvergne, CNRS, ICCF, Clermont-Ferrand, France
| | - Margarita Darder
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain
| | - Pilar Aranda
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain
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18
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Guo J, Zhang G, Peng R, Cao Y, Dong H, Zhang H. Thermosensitive PCEC hydrogel loaded with carbon nanotubes for slow-release lubrication effect. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02610-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Cheng X, Huang X, Tian B, Wang T, Hao H. Behaviors and physical mechanism of ceftezole sodium de-agglomeration driven by ultrasound. ULTRASONICS SONOCHEMISTRY 2021; 74:105570. [PMID: 33930689 PMCID: PMC8100626 DOI: 10.1016/j.ultsonch.2021.105570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/06/2021] [Accepted: 04/16/2021] [Indexed: 06/12/2023]
Abstract
Ultrasound-mediated method, which can effectively disperse agglomerates or even eliminate agglomeration, has received more and more attentions in industrial crystallization. However, the ultrasound-mediated de-agglomeration mechanism has not been well understood, and no general conclusions have been drawn. In this study, the crystallization and de-agglomeration process of ceftezole sodium agglomerates under ultrasound irradiation were systematically investigated. Kapur function was selected to investigate the de-agglomeration process under different ultrasonic powers. The results revealed that ultrasound could efficiently inhibit agglomeration. Besides, the de-agglomeration of large sized agglomerate particles was found to be easier to occur in comparison with small sized particles due to its higher specific breakage rate. Finally, the de-agglomeration mechanism under ultrasonic irradiation was proposed on the basis of the calculated cumulative breakage functions.
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Affiliation(s)
- Xiaowei Cheng
- National Engineering Research Center for Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Xin Huang
- National Engineering Research Center for Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
| | - Beiqian Tian
- National Engineering Research Center for Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Ting Wang
- National Engineering Research Center for Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Hongxun Hao
- National Engineering Research Center for Industrial Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China; School of Chemical Engineering and Technology, Hainan University, Haikou 570208, China.
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20
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Park Y, Byun H, An J, Kim S, Lee JH. Large-scale fabrication of a highly flexible and transparent adhesive film embedded with elastic hybrid nanoparticles. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.02.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Li J, Tian L, Fang Y, Chen W, Hunag G. Ultrasonic‐Assisted Preparation of Maize Starch–Caffeic Acid Complex: Physicochemical and Digestion Properties. STARCH-STARKE 2020. [DOI: 10.1002/star.202000084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Junhui Li
- Key Laboratory of Marine Food Quality and Hazard Controlling Technology of Zhejiang Province College of Life Sciences China Jiliang University Hangzhou Zhejiang 310018 P. R. China
| | - Lei Tian
- Key Laboratory of Marine Food Quality and Hazard Controlling Technology of Zhejiang Province College of Life Sciences China Jiliang University Hangzhou Zhejiang 310018 P. R. China
| | - Yizhou Fang
- Key Laboratory of Marine Food Quality and Hazard Controlling Technology of Zhejiang Province College of Life Sciences China Jiliang University Hangzhou Zhejiang 310018 P. R. China
| | - Wenwei Chen
- Key Laboratory of Marine Food Quality and Hazard Controlling Technology of Zhejiang Province College of Life Sciences China Jiliang University Hangzhou Zhejiang 310018 P. R. China
| | - Guangrong Hunag
- Key Laboratory of Marine Food Quality and Hazard Controlling Technology of Zhejiang Province College of Life Sciences China Jiliang University Hangzhou Zhejiang 310018 P. R. China
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22
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Amirsardari Z, Dourani A, Amirifar MA, Ghadiri Massoom N, Javadi A, Ehsani R, Ghanbarnejad R. Dentate number and functionality of O, N-donor ligands for the growth and catalytic reaction of iridium nanoparticles. CHEMICAL PAPERS 2020. [DOI: 10.1007/s11696-020-01148-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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23
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Razzino CA, Serafín V, Gamella M, Pedrero M, Montero-Calle A, Barderas R, Calero M, Lobo AO, Yáñez-Sedeño P, Campuzano S, Pingarrón JM. An electrochemical immunosensor using gold nanoparticles-PAMAM-nanostructured screen-printed carbon electrodes for tau protein determination in plasma and brain tissues from Alzheimer patients. Biosens Bioelectron 2020; 163:112238. [DOI: 10.1016/j.bios.2020.112238] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 04/14/2020] [Accepted: 04/23/2020] [Indexed: 12/14/2022]
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24
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How Photocatalyst Dosage and Ultrasound Application Influence the Photocatalytic Degradation Rate of Phenol in Water: Elucidating the Mechanisms Behind. WATER 2020. [DOI: 10.3390/w12061672] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Photocatalysis is of high interest for the treatment of wastewater containing non-biodegradable organic components. In this work, the photocatalytic degradation of phenol by TiO2 photocatalysis was assessed, the influence of ultrasound (US) treatment was evaluated, and the mechanisms behind it were elucidated. It was shown that the TiO2 concentration (in suspension) has a large influence on the degradation kinetics. At high TiO2 concentrations, a reduced efficiency was observed due to the shielding of the UV light by TiO2 particles. US treatment effectively increased phenol degradation by improving the mass transfer while it was shown by the experimental data that particle deagglomeration did not play a significant role. The degradation mainly occurred through indirect phenol oxidation by hydroxyl (OH*) radicals, which were formed in situ at the surface of the photocatalyst. Finally, based on the partial least squares (PLS) methodology, a mathematical model was developed, representing phenol degradation as a function of the selected process conditions.
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25
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Trushlyakov VI, Novikov AA, Lesnyak IY, Panichkin AV. Study of acoustic and low-pressure exposure on the temperature of the evaporation of a liquid with free interface before it freezes. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2019; 146:3333. [PMID: 31795645 DOI: 10.1121/1.5131643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 10/13/2019] [Indexed: 06/10/2023]
Abstract
On the basis of the first law of thermodynamics, a thermodynamic physical and mathematical model of the process of evaporation and freezing in a partially filled closed volume of a liquid under acoustic exposure (AE) and pressure reduction has been developed. The acoustic effect on the liquid is taken as a component on the heating of the liquid in the closed volume. The experimental studies performed under AE (amplitude 2.0 μm, frequency 25 kHz), initial temperature, and mass of the liquid 300.85 K, 7 g, respectively, the pressure decreases from 101 to 0.5 kPa showed a close coincidence of the actual and calculated moments of freezing start liquid surfaces, as well as close calculated and experimental values of liquid temperatures during the experiment.
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Affiliation(s)
- V I Trushlyakov
- Department of Avia and Rocket Building, Omsk State Technical University, 11 Mira Street, Omsk 644050, Russia
| | - A A Novikov
- Department of Avia and Rocket Building, Omsk State Technical University, 11 Mira Street, Omsk 644050, Russia
| | - I Y Lesnyak
- Department of Avia and Rocket Building, Omsk State Technical University, 11 Mira Street, Omsk 644050, Russia
| | - A V Panichkin
- Sobolev Institute of Mathematics of the Siberian Branch of Russian Academy of Sciences, 13 Pevtsova Street, Omsk 644043, Russia
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26
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Highly Dispersed Ag 2S Nanoparticles: In Situ Synthesis, Size Control, and Modification to Mechanical and Tribological Properties towards Nanocomposite Coatings. NANOMATERIALS 2019; 9:nano9091308. [PMID: 31547427 PMCID: PMC6781087 DOI: 10.3390/nano9091308] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/06/2019] [Accepted: 09/09/2019] [Indexed: 11/25/2022]
Abstract
A facile in situ synthesis approach and a size control strategy were established to obtain Ag2S nanoparticles in polyimide (PI) composite coatings. Such Ag2S nanoparticles in the composite coatings were characterized, and the effects of the as-obtained Ag2S nanoparticles of different sizes on the mechanical and tribological properties of the nanocomposite coatings were investigated. Results indicate that the in situ synthesized Ag2S nanoparticles exhibited good dispersibility and bimodal and multimodal size distribution in the nanocomposite coatings. The size of the Ag2S nanoparticles can be effectively controlled by adjusting the substituent alkyl chain length of single-source precursor, and these Ag2S nanoparticles exhibited superior improvement to mechanical and tribological properties of the nanocomposite coatings. More importantly, the Ag2S nanoparticles with the proper grain size and bimodal size distribution provided the optimal mechanical and tribological properties for the nanocomposite coatings, and the excellent tribological properties were attributed to their outstanding mechanical properties and strong ability to form a homogenous and stable protective tribofilm.
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27
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Cabello-Alvarado C, Andrade-Guel M, Pérez-Alvarez M, Cadenas-Pliego G, Cortés-Hernández DA, Bartolo-Pérez P, Ávila-Orta CA, Cruz-Delgado VJ, Zepeda-Pedreguera A. Graphene Nanoplatelets Modified with Amino-Groups by Ultrasonic Radiation of Variable Frequency for Potential Adsorption of Uremic Toxins. NANOMATERIALS 2019; 9:nano9091261. [PMID: 31491904 PMCID: PMC6781048 DOI: 10.3390/nano9091261] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 08/30/2019] [Accepted: 09/02/2019] [Indexed: 12/12/2022]
Abstract
Chronic kidney disease (CKD) is a worldwide public health problem. In stages III and IV of CKD, uremic toxins must be removed from the patient by absorption, through a treatment commonly called hemodialysis. Aiming to improve the absorption of uremic toxins, we have studied its absorption in chemically modified graphene nanoplatelets (GNPs). This study involved the reaction between GNPs and diamines with reaction times of 30, 45 and 60 min using ultrasound waves of different amplitudes and frequencies. Functionalized GNPs were analyzed by Fourier Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy and energy dispersitive spectroscopy (SEM-EDS), and Thermogravimetric analysis (TGA). The analysis of the functional groups confirmed the presence of amide and hydroxyl groups on the surface of the GNPs by reactions of diamines with carboxylic acids and epoxides. Adsorption of uremic toxins was determined using equilibrium isotherms, where the maximum percentage of removal of uremic toxins was 97%. Dispersion of modified graphene nanoplatelets was evaluated in water, ethanol and hexane, as a result of this treatment was achieved a good and effective dispersion of diamines-modified graphene nanoplatelets in ethanol and hexane. Finally, the results of hemolysis assays of the modified graphene with amine demonstrated that it was not cytotoxic when using 500 mg/mL. The samples of modified graphene demonstrated low degree of hemolysis (<2%), so this material can be used for in vivo applications such as hemodialysis.
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Affiliation(s)
- C Cabello-Alvarado
- CONACYT Research Fellow-Research and Innovation Consortium of the State of Tlaxcala, C.P. 90000 Tlaxcala, Mexico.
| | - M Andrade-Guel
- Center for Research in Applied Chemistry (CIQA), Saltillo, 25315 Coahuila, México
| | - M Pérez-Alvarez
- CONACYT Research Fellow-Mexican Petroleum Institute, Eje Central Lázaro Cárdenas Norte 152, 07730 Ciudad de México, México
| | - G Cadenas-Pliego
- Center for Research in Applied Chemistry (CIQA), Saltillo, 25315 Coahuila, México.
| | - Dora A Cortés-Hernández
- Center for Research and Advanced Studies of the National Polytechnic Institute (CINVESTAV) Saltillo Unit. Av. Industria Metalúrgica #1062 Parque Industrial Saltillo-Ramos Arizpe, 25900 Saltillo, México
| | - P Bartolo-Pérez
- Center for Research and Advanced Studies of the National Polytechnic Institute (CINVESTAV) Mérida Unit, Km. 6 Antigua Carretera a Progreso, Apartado postal 73 Cordemex, Mérida, 97310 Yucatán, México
| | - C A Ávila-Orta
- Center for Research in Applied Chemistry (CIQA), Saltillo, 25315 Coahuila, México.
| | - V J Cruz-Delgado
- CONACYT Research Fellow- Materials Unit, Yucatan Scientific Research Center, A.C., 97205 Mérida, México
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28
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The Impact of Particle Reinforcement with Al2O3, TiB2, and TiC and Severe Plastic Deformation Treatment on the Combination of Strength and Electrical Conductivity of Pure Aluminum. METALS 2019. [DOI: 10.3390/met9010065] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
It has been found that a high electrical conductivity of 63.1%, the International Annealed Copper Standard (IACS), and high mechanical properties are achieved by the initial aluminum alloy after undergoing four cycles of the severe plastic deformation (SPD) process. It has been found that when TiB2 particles are introduced into aluminum and the samples are subject to SPD, the mechanical characteristics of the aluminum alloy are improved. Microhardness (HV) increases from 329 to 665 MPa, yield strength (YS) increases from 38 to 103 MPa, and ultimate tensile strength (UTS) increases from 73 to 165 MPa while maintaining the initial electrical conductivity of cast aluminum without reinforcing particles (53.9–54.1% IACS).
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29
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Standard characterisation method for the granulometric state of intensely dispersed pigments and fillers based on an interlaboratory performance study. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2018.07.052] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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30
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Chen M, Wu S, Xu S, Yu B, Shilbayeh M, Liu Y, Zhu X, Wang J, Gong J. Caking of crystals: Characterization, mechanisms and prevention. POWDER TECHNOL 2018. [DOI: 10.1016/j.powtec.2017.04.052] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Camarada MB, Comer J, Poblete H, Azhagiya Singam ER, Marquez-Miranda V, Morales-Verdejo C, Gonzalez-Nilo FD. Experimental and Computational Characterization of the Interaction between Gold Nanoparticles and Polyamidoamine Dendrimers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10063-10072. [PMID: 30074805 DOI: 10.1021/acs.langmuir.8b01809] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dendrimers provide a means to control the synthesis of gold nanoparticles and stabilize their suspensions. However, design of improved dendrimers for this application is hindered by a lack of understanding how the dendrimers and synthesis conditions determine nanoparticle morphology and suspension stability. In the present work, we evaluate the effect of polyamidoamine (PAMAM) dendrimers terminated with different functional groups (-OH or -NH3+) and different synthesis conditions on the morphology of the resulting gold nanoparticles and their stability in solution. We leverage molecular dynamics (MD) simulations to identify the atomic interactions that underlie adsorption of PAMAM dendrimers to gold surface and how the thermodynamics of this adsorption depends on the terminal functional groups of the dendrimers. We find that gold nanoparticles formed with hydroxyl-terminated PAMAM (PAMAM-OH) rapidly aggregate, whereas those formed with PAMAM-NH3+ are stable in solution for months of storage. Synthesis under ultrasound sonication is shown to be more rapid than that under agitation, with sonication producing smaller nanoparticles. Free-energy calculations in MD simulations show that all dendrimers have a high affinity for the gold surface, although PAMAM-OH and its oxidized aldehyde form (PAMAM-CHO) have a greater affinity for the nanoparticle surface than PAMAM-NH3+. Although adsorption of PAMAM-OH and PAMAM-CHO has both favorable entropy and enthalpy, adsorption of PAMAM-NH3+ is driven by a strong enthalpic component subject to an unfavorable entropic component.
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Affiliation(s)
- M B Camarada
- Centro de Nanotecnología Aplicada, Facultad de Ciencias , Universidad Mayor , Camino la Pirámide 5750 , Huechuraba , Santiago 8580745 , Chile
| | - J Comer
- Nanotechnology Innovation Center of Kansas State, Institute of Computational Comparative Medicine, Department of Anatomy and Physiology , Kansas State University , 1800 Denison Avenue , Manhattan , Kansas 66506 , United States
| | - H Poblete
- Centro de Bioinformática y Simulación Molecular, Facultad de Ingeniería; Nucleo Científico Multidiciplinario-DI; Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD) , Universidad de Talca , 2 Norte 685 , Casilla 721 , Talca , Chile
| | - E R Azhagiya Singam
- Nanotechnology Innovation Center of Kansas State, Institute of Computational Comparative Medicine, Department of Anatomy and Physiology , Kansas State University , 1800 Denison Avenue , Manhattan , Kansas 66506 , United States
| | - V Marquez-Miranda
- Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias de la Vida , Universidad Andrés Bello , Av. República 330 , Santiago 8370186 , Chile
| | - C Morales-Verdejo
- Centro de Nanotecnología Aplicada, Facultad de Ciencias , Universidad Mayor , Camino la Pirámide 5750 , Huechuraba , Santiago 8580745 , Chile
| | - F D Gonzalez-Nilo
- Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias de la Vida , Universidad Andrés Bello , Av. República 330 , Santiago 8370186 , Chile
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Li H, Rostamizadeh M, Mameri K, Boffito DC, Saadatkhah N, Rigamonti MG, Patience GS. Ultrasound assisted wet stirred media mill of high concentration LiFePO
4
and catalysts. CAN J CHEM ENG 2018. [DOI: 10.1002/cjce.23212] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- He Li
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | | | - Kahina Mameri
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Daria C. Boffito
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Nooshin Saadatkhah
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Marco Giulio Rigamonti
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
| | - Gregory S. Patience
- Department of Chemical EngineeringPolytechnique Montréal C.P. 6079, Succ. CV Montréal QC, H3C 3A7 Canada
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33
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Preparation, analyses and application of cobalt–manganese oxides/nylon 6,6 nanocomposites. Polym Bull (Berl) 2018. [DOI: 10.1007/s00289-018-2292-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Almansoori Z, Khorshidi B, Sadri B, Sadrzadeh M. Parametric study on the stabilization of metal oxide nanoparticles in organic solvents: A case study with indium tin oxide (ITO) and heptane. ULTRASONICS SONOCHEMISTRY 2018; 40:1003-1013. [PMID: 28946396 DOI: 10.1016/j.ultsonch.2017.09.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 09/06/2017] [Accepted: 09/06/2017] [Indexed: 06/07/2023]
Abstract
The tendency of nanoparticles (NPs) to form large aggregates has been a major limitation to their widespread applications where utilizing monodisperse and stable suspension of NPs is essential. The aggregation of NPs becomes more challenging when there is less affinity between the dispersed phase (NPs) and the continuous phase (solvent), such as, dispersion of hydrophilic metal oxide NPs into a nonpolar (organic) solvent. The objective of this study is to systematically investigate the synergistic effects of eight dispersion parameters on the size and stability of indium tin oxide (ITO) NPs in heptane. The matrix of experimentation was designed using an L18 Taguchi method. The analysis of variance (ANOVA) of the experimental results revealed that the most significant factors on the size and stability of NPs were the mass of ITO NPs and the volume of the dispersing agent. Taguchi signal-to-noise (SN) ratio analysis was used to determine the optimal factor levels for the preparation of well-dispersed and stable NP suspensions. Confirmation tests were carried out at the suggested levels of the ANOVA predictive model, and highly stable ITO NPs in heptane with the size distribution of 43.0-68.3nm were obtained. The results of the present parametric study can be used for a broad range of applications where effective stabilization of metal oxide NPs in organic solvents is desired.
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Affiliation(s)
- Zayed Almansoori
- Department of Mechanical Engineering, 10-367 Donadeo Innovation Center for Engineering, Advanced Water Research Lab (AWRL), University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Behnam Khorshidi
- Department of Mechanical Engineering, 10-367 Donadeo Innovation Center for Engineering, Advanced Water Research Lab (AWRL), University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Behnam Sadri
- School of Industrial Engineering, Purdue University, 315 N. Grant Street, West Lafayette, IN 47907, USA
| | - Mohtada Sadrzadeh
- Department of Mechanical Engineering, 10-367 Donadeo Innovation Center for Engineering, Advanced Water Research Lab (AWRL), University of Alberta, Edmonton, AB T6G 1H9, Canada.
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35
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Sumitomo S, Koizumi H, Uddin MA, Kato Y. Comparison of dispersion behavior of agglomerated particles in liquid between ultrasonic irradiation and mechanical stirring. ULTRASONICS SONOCHEMISTRY 2018; 40:822-831. [PMID: 28946491 DOI: 10.1016/j.ultsonch.2017.08.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 08/22/2017] [Accepted: 08/23/2017] [Indexed: 05/09/2023]
Abstract
The particle dispersion behavior was compared for ultrasonic irradiation and mechanical stirring. The experiment and calculation were carried out with polymethylmethacrylate (PMMA) particles. The dispersion rate of the agglomerated particles increased with the decreasing ultrasonic frequency and the increasing electric power, whereas it increased with the increasing rotation speed for the mechanical stirring. The temporal change in the particle dispersion proceeded stably after passage of a long time. The dispersion of the ultrasonic irradiation was suggested to occur by the erosion from the surface of the cluster one by one due to the bulk cavitation as well as the division into smaller particles because of the inner cavitation, and that of the mechanical stirring mainly by the division into smaller clusters due to the shear stress flow. Based on the experimental results, mathematical models for the ultrasonic irradiation and mechanical stirring were developed with the dispersion and agglomeration terms and the calculation of the temporal change in the total cluster number at the different operational factors agreed with the experiments. The dispersion efficiency of the ultrasonic irradiation was larger than that of the mechanical stirring at the lower input power, but it was reversed at the higher input power.
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Affiliation(s)
- Syunsuke Sumitomo
- Graduate School of Environmental and Life Science, Okayama University, 1-1 Tsushima-naka, 3-chome, Kita-ku, Okayama 700-8530, Japan
| | - Hayato Koizumi
- Graduate School of Environmental and Life Science, Okayama University, 1-1 Tsushima-naka, 3-chome, Kita-ku, Okayama 700-8530, Japan
| | - Md Azhar Uddin
- Graduate School of Environmental and Life Science, Okayama University, 1-1 Tsushima-naka, 3-chome, Kita-ku, Okayama 700-8530, Japan
| | - Yoshiei Kato
- Graduate School of Environmental and Life Science, Okayama University, 1-1 Tsushima-naka, 3-chome, Kita-ku, Okayama 700-8530, Japan.
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36
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Enhanced photocatalytic activity of ZnO nanoparticles grown on porous silica microparticles. APPLIED NANOSCIENCE 2017. [DOI: 10.1007/s13204-017-0626-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Camarada MB. PAMAM Dendrimers as Support for the Synthesis of Gold Nanoparticles: Understanding the Effect of the Terminal Groups. J Phys Chem A 2017; 121:8124-8135. [DOI: 10.1021/acs.jpca.7b08272] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. B. Camarada
- Centro de Genómica
y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago, Chile
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38
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Singh D, Bedi N, Tiwary AK. Enhancing solubility of poorly aqueous soluble drugs: critical appraisal of techniques. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2017. [DOI: 10.1007/s40005-017-0357-1] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Retamal Marín R, Babick F, Stintz M. Ultrasonic dispersion of nanostructured materials with probe sonication − practical aspects of sample preparation. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.05.049] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Vorozhtsov S, Vorozhtsov A, Kudryashova O, Zhukov I, Promakhov V. Structural and mechanical properties of aluminium-based composites processed by explosive compaction. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.03.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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41
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Gül Özcan-Taşkın N, Padron GA, Kubicki D. Comparative performance of in-line rotor-stators for deagglomeration processes. Chem Eng Sci 2016. [DOI: 10.1016/j.ces.2016.09.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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Yeoh WK, Ali A. Ultrasound treatment on phenolic metabolism and antioxidant capacity of fresh-cut pineapple during cold storage. Food Chem 2016; 216:247-53. [PMID: 27596416 DOI: 10.1016/j.foodchem.2016.07.074] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 07/08/2016] [Accepted: 07/10/2016] [Indexed: 11/19/2022]
Abstract
Ultrasound treatment at different power output (0, 25 and 29W) and exposure time (10 and 15min) was used to investigate its effect on the phenolic metabolism enzymes, total phenolic content and antioxidant capacity of fresh-cut pineapple. Following ultrasound treatment at 25 and 29W, the activity of phenylalanine ammonia lyase (PAL) was increased significantly (P<0.05) by 2.0 and 1.9-fold, when compared to control. Meanwhile, both the activity of polyphenol oxidase (PPO) and polyphenol peroxidase (POD) in fresh-cut pineapple was significantly (P<0.05) lower than control upon subjected to ultrasound treatment. In the present study, induction of PAL was found to significantly (P<0.001) correlate with higher total phenolic content and thus higher antioxidant capacity in fresh-cut pineapple. Results suggest that hormetic dosage of ultrasound treatment can enhance the activity of PAL and total phenolic content and hence the total antioxidant capacity to encounter with oxidative stress.
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Affiliation(s)
- Wei Keat Yeoh
- Centre of Excellence for Postharvest Biotechnology (CEPB), School of Biosciences, The University of Nottingham Malaysia Campus, Semenyih 43500, Selangor, Malaysia
| | - Asgar Ali
- Centre of Excellence for Postharvest Biotechnology (CEPB), School of Biosciences, The University of Nottingham Malaysia Campus, Semenyih 43500, Selangor, Malaysia.
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43
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Ding Y, Zheng J, Xia X, Ren T, Kan J. Box–Behnken design for the optimization of nanoscale retrograded starch formation by high-power ultrasonication. Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2015.11.022] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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44
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Graves JE, Sugden M, Litchfield RE, Hutt DA, Mason TJ, Cobley AJ. Ultrasound assisted dispersal of a copper nanopowder for electroless copper activation. ULTRASONICS SONOCHEMISTRY 2016; 29:428-438. [PMID: 26585024 DOI: 10.1016/j.ultsonch.2015.10.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 10/15/2015] [Accepted: 10/23/2015] [Indexed: 06/05/2023]
Abstract
This paper describes the ultrasound assisted dispersal of a low wt./vol.% copper nanopowder mixture and determines the optimum conditions for de-agglomeration. A commercially available powder was added to propan-2-ol and dispersed using a magnetic stirrer, a high frequency 850 kHz ultrasonic cell, a standard 40 kHz bath and a 20 kHz ultrasonic probe. The particle size of the powder was characterized using dynamic light scattering (DLS). Z-Average diameters (mean cluster size based on the intensity of scattered light) and intensity, volume and number size distributions were monitored as a function of time and energy input. Low frequency ultrasound was found to be more effective than high frequency ultrasound at de-agglomerating the powder and dispersion with a 20 kHz ultrasonic probe was found to be very effective at breaking apart large agglomerates containing weakly bound clusters of nanoparticles. In general, the breakage of nanoclusters was found to be a factor of ultrasonic intensity, the higher the intensity the greater the de-agglomeration and typically micron sized clusters were reduced to sub 100 nm particles in less than 30 min using optimum conditions. However, there came a point at which the forces generated by ultrasonic cavitation were either insufficient to overcome the cohesive bonds between smaller aggregates or at very high intensities decoupling between the tip and solution occurred. Absorption spectroscopy indicated a copper core structure with a thin oxide shell and the catalytic performance of this dispersion was demonstrated by drop coating onto substrates and subsequent electroless copper metallization. This relatively inexpensive catalytic suspension has the potential to replace precious metal based colloids used in electronics manufacturing.
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Affiliation(s)
- John E Graves
- Functional Materials Applied Research Group, Coventry University, Priory Street, Coventry CV1 5FB, UK.
| | - Mark Sugden
- Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
| | - Robert E Litchfield
- Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
| | - David A Hutt
- Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
| | - Timothy J Mason
- The Sonochemistry Centre at Coventry University, Faculty of Health and Life Sciences, Priory Street, Coventry CV1 5FB, UK
| | - Andrew J Cobley
- Functional Materials Applied Research Group, Coventry University, Priory Street, Coventry CV1 5FB, UK
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Recent advances in the engineering of nanosized active pharmaceutical ingredients: Promises and challenges. Adv Colloid Interface Sci 2016; 228:71-91. [PMID: 26792017 DOI: 10.1016/j.cis.2015.11.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 10/28/2015] [Accepted: 11/18/2015] [Indexed: 11/22/2022]
Abstract
The advances in the field of nanotechnology have revolutionized the field of delivery of poorly soluble active pharmaceutical ingredients (APIs). Nanosized formulations have been extensively investigated to achieve a rapid dissolution and therefore pharmacokinetic properties similar to those observed in solutions. The present review outlines the recent advances, promises and challenges of the engineering nanosized APIs. The principles, merits, demerits and applications of the current 'bottom-up' and 'top-down' technologies by which the state of the art nanosized APIs can be produced were described. Although the number of research reports on the nanoparticle engineering topic has been growing in the last decade, the challenge is to take numerous research outcomes and convert them into strategies for the development of marketable products.
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Babick F, Mielke J, Wohlleben W, Weigel S, Hodoroaba VD. How reliably can a material be classified as a nanomaterial? Available particle-sizing techniques at work. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2016; 18:158. [PMID: 27375365 PMCID: PMC4908171 DOI: 10.1007/s11051-016-3461-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 05/25/2016] [Indexed: 05/05/2023]
Abstract
ABSTRACT Currently established and projected regulatory frameworks require the classification of materials (whether nano or non-nano) as specified by respective definitions, most of which are based on the size of the constituent particles. This brings up the question if currently available techniques for particle size determination are capable of reliably classifying materials that potentially fall under these definitions. In this study, a wide variety of characterisation techniques, including counting, fractionating, and spectroscopic techniques, has been applied to the same set of materials under harmonised conditions. The selected materials comprised well-defined quality control materials (spherical, monodisperse) as well as industrial materials of complex shapes and considerable polydispersity. As a result, each technique could be evaluated with respect to the determination of the number-weighted median size. Recommendations on the most appropriate and efficient use of techniques for different types of material are given.
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Affiliation(s)
- Frank Babick
- />Research Group of Mechanical Process Engineering, Institut für Verfahrenstechnik und Umwelttechnik, Technische Universität Dresden (TUD), 01062 Dresden, Germany
| | - Johannes Mielke
- />Division 6.8 Surface Analysis and Interfacial Chemistry, Bundesanstalt für Materialforschung und -prüfung (BAM), 12205 Berlin, Germany
| | - Wendel Wohlleben
- />Department of Material Physics, BASF SE, 67056 Ludwigshafen, Germany
| | - Stefan Weigel
- />RIKILT – Wageningen UR, 6700 AE Wageningen, The Netherlands
- />Bundesinstitut für Risikobewertung (BfR), 10589 Berlin, Germany
| | - Vasile-Dan Hodoroaba
- />Division 6.8 Surface Analysis and Interfacial Chemistry, Bundesanstalt für Materialforschung und -prüfung (BAM), 12205 Berlin, Germany
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Le NT, Julcour-Lebigue C, Delmas H. An executive review of sludge pretreatment by sonication. J Environ Sci (China) 2015; 37:139-153. [PMID: 26574097 DOI: 10.1016/j.jes.2015.05.031] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 05/04/2015] [Accepted: 05/15/2015] [Indexed: 06/05/2023]
Abstract
Ultrasonication (US), which creates hydro-mechanical shear forces in cavitation, is an advanced technology in sludge pretreatment. However, there are many factors affecting the efficacy of cavitation and ultrasonication disintegration of sludge as a consequence. The objective of this work is to present an extensive review of evaluation approaches of sludge US pretreatment efficiency. Besides, optimization methodologies of related parameters, the differences of optimum values and the similarities of affecting trends on cavitation and sludge pretreatment efficiency were specifically pointed out, including ambient conditions, ultrasonic properties, and sludge characteristics. The research is a prerequisite for optimization of sludge US pretreatment efficiency in lab-scale and practical application. There is not-yet a comprehensive method to evaluate the efficiency of sludge US pretreatment, but some main parameters commonly used for this purpose are degree of sludge disintegration, proteins, particle size reduction, etc. Regarding US parameters, power input PUS, intensity IUS, and frequency FS seem to have significant effects. However, the magnitude of the effect of PUS and probe size in terms of IUS has not been clearly detailed. Investigating very low FS seems interesting but has not yet been taken into consideration. In addition, static pressure effect has been marginally studied only and investigation on the effect of pH prior to US process has been restricted. Their effects therefore should be varied separately and simultaneously with other related parameters, i.e. process conditions, ultrasonic properties, and sludge characteristics, to optimize sludge US pretreatment process.
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Affiliation(s)
- Ngoc Tuan Le
- University of Science, Vietnam National University, Ho Chi Minh City, Viet Nam; Université de Toulouse, Laboratoire de Génie Chimique, INP-ENSIACET, France.
| | | | - Henri Delmas
- Université de Toulouse, Laboratoire de Génie Chimique, INP-ENSIACET, France
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Zhang Y, Li S. Acoustical scattering cross section of gas bubbles under dual-frequency acoustic excitation. ULTRASONICS SONOCHEMISTRY 2015; 26:437-444. [PMID: 25801796 DOI: 10.1016/j.ultsonch.2015.02.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 02/02/2015] [Accepted: 02/27/2015] [Indexed: 05/25/2023]
Abstract
The acoustical scattering cross section is a paramount parameter determining the scattering ability of cavitation bubbles when they are excited by the incident acoustic waves. This parameter is strongly related with many important applications of acoustic cavitation including facilitating the reaction of chemical process, boosting bubble sonoluminescence, and performing non-invasive therapy and drug delivery. In present paper, both the analytical and numerical solutions of acoustical scattering cross section of gas bubbles under dual-frequency excitation are obtained. The validity of the analytical solution is shown with demonstrating examples. The nonlinear characteristics (e.g., harmonics, subharmonics and ultraharmonics) of the scattering cross section curve under dual-frequency approach are investigated. Compared with single-frequency approach, the dual-frequency approach displays more resonances termed as "combination resonances" and could promote the acoustical scattering cross section significantly within a much broader range of bubble sizes due to the generation of more resonances. The influence of several paramount parameters (e.g., acoustic pressure amplitude, power allocations between two acoustic components, and the ratio of the frequencies) in the dual-frequency system on the predictions of scattering cross section has been discussed.
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Affiliation(s)
- Yuning Zhang
- School of Engineering, University of Warwick, Coventry CV4 7AL, UK.
| | - Shengcai Li
- School of Engineering, University of Warwick, Coventry CV4 7AL, UK
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Delmas H, Le NT, Barthe L, Julcour-Lebigue C. Optimization of hydrostatic pressure at varied sonication conditions--power density, intensity, very low frequency--for isothermal ultrasonic sludge treatment. ULTRASONICS SONOCHEMISTRY 2015; 25:51-59. [PMID: 25199444 DOI: 10.1016/j.ultsonch.2014.08.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 08/13/2014] [Indexed: 06/03/2023]
Abstract
This work aims at investigating for the first time the key sonication (US) parameters: power density (DUS), intensity (IUS), and frequency (FS) - down to audible range, under varied hydrostatic pressure (Ph) and low temperature isothermal conditions (to avoid any thermal effect). The selected application was activated sludge disintegration, a major industrial US process. For a rational approach all comparisons were made at same specific energy input (ES, US energy per solid weight) which is also the relevant economic criterion. The decoupling of power density and intensity was obtained by either changing the sludge volume or most often by changing probe diameter, all other characteristics being unchanged. Comprehensive results were obtained by varying the hydrostatic pressure at given power density and intensity. In all cases marked maxima of sludge disintegration appeared at optimum pressures, which values increased at increasing power intensity and density. Such optimum was expected due to opposite effects of increasing hydrostatic pressure: higher cavitation threshold then smaller and fewer bubbles, but higher temperature and pressure at the end of collapse. In addition the first attempt to lower US frequency down to audible range was very successful: at any operation condition (DUS, IUS, Ph, sludge concentration and type) higher sludge disintegration was obtained at 12 kHz than at 20 kHz. The same values of optimum pressure were observed at 12 and 20 kHz. At same energy consumption the best conditions - obtained at 12 kHz, maximum power density 720 W/L and 3.25 bar - provided about 100% improvement with respect to usual conditions (1 bar, 20 kHz). Important energy savings and equipment size reduction may then be expected.
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Affiliation(s)
- Henri Delmas
- Université de Toulouse, INP, UPS, LGC (Laboratoire de Génie Chimique), 4 Allée Emile Monso, CS 84234, F-31432 Toulouse, France; CNRS, LGC, F-31432 Toulouse, France.
| | - Ngoc Tuan Le
- Université de Toulouse, INP, UPS, LGC (Laboratoire de Génie Chimique), 4 Allée Emile Monso, CS 84234, F-31432 Toulouse, France; CNRS, LGC, F-31432 Toulouse, France
| | - Laurie Barthe
- Université de Toulouse, INP, UPS, LGC (Laboratoire de Génie Chimique), 4 Allée Emile Monso, CS 84234, F-31432 Toulouse, France; CNRS, LGC, F-31432 Toulouse, France
| | - Carine Julcour-Lebigue
- Université de Toulouse, INP, UPS, LGC (Laboratoire de Génie Chimique), 4 Allée Emile Monso, CS 84234, F-31432 Toulouse, France; CNRS, LGC, F-31432 Toulouse, France
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50
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Song S, Zhou X, Li L, Ma W. Numerical simulation and experimental validation of SiC nanoparticle distribution in magnesium melts during ultrasonic cavitation based processing of magnesium matrix nanocomposites. ULTRASONICS SONOCHEMISTRY 2015; 24:43-54. [PMID: 25559849 DOI: 10.1016/j.ultsonch.2014.12.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 12/14/2014] [Accepted: 12/15/2014] [Indexed: 06/04/2023]
Abstract
A two-dimensional coupled model of the temperature field, flow field and pressure field of SiC nanoparticles reinforced AZ91D magnesium composite slurries fabricated by high-intensity ultrasonic stirring method is established. The multiphase flow mixture model is used to simulate the temperature field, flow field and pressure field of the semi-solid slurries. The effects of ultrasonic stirring parameters on the distribution of SiC nanoparticles in AZ91D magnesium alloy melt are simulated by using finite difference method. The simulation results show that the distribution uniformity of SiC nanoparticles in Mg melts is influenced by ultrasonic power and frequency as well as the ultrasonic processing time and depth of ultrasonic probe dipped into the melts, but the ultrasonic power and frequency have greater influence on particle distribution. In the present work, the magnesium matrix composite with uniform dispersion of SiC nanoparticles can be obtained when the ultrasonic power, the ultrasonic frequency, the depth of ultrasonic probe dipped into the melts and ultrasonic processing time are 2 kW, 20 kHz, 20-30 mm and 120 s, respectively. It has been proven that the similar uniform dispersion could be achieved under the optimal ultrasonic processing conditions although SiC particle sizes in the agglomerated SiC-nanoparticles varied between 30 nm and 300 nm in diameter. Moreover, the microstructure and mechanical properties of the SiC nanoparticles reinforced AZ91D magnesium alloy based composites obtained experimentally are improved significantly by using the optimized ultrasonic processing parameters based on numerical simulation.
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Affiliation(s)
- Shangyu Song
- State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, PR China
| | - Xia Zhou
- State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, PR China.
| | - Li Li
- State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, PR China
| | - Wuming Ma
- State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, PR China
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