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Rock CA, Tschumper GS. Insight into the Binding of Argon to Cyclic Water Clusters from Symmetry-Adapted Perturbation Theory. Int J Mol Sci 2023; 24:17480. [PMID: 38139311 PMCID: PMC10744083 DOI: 10.3390/ijms242417480] [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: 11/29/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/24/2023] Open
Abstract
This work systematically examines the interactions between a single argon atom and the edges and faces of cyclic H2O clusters containing three-five water molecules (Ar(H2O)n=3-5). Full geometry optimizations and subsequent harmonic vibrational frequency computations were performed using MP2 with a triple-ζ correlation consistent basis set augmented with diffuse functions on the heavy atoms (cc-pVTZ for H and aug-cc-pVTZ for O and Ar; denoted as haTZ). Optimized structures and harmonic vibrational frequencies were also obtained with the two-body-many-body (2b:Mb) and three-body-many-body (3b:Mb) techniques; here, high-level CCSD(T) computations capture up through the two-body or three-body contributions from the many-body expansion, respectively, while less demanding MP2 computations recover all higher-order contributions. Five unique stationary points have been identified in which Ar binds to the cyclic water trimer, along with four for (H2O)4 and three for (H2O)5. To the best of our knowledge, eleven of these twelve structures have been characterized here for the first time. Ar consistently binds more strongly to the faces than the edges of the cyclic (H2O)n clusters, by as much as a factor of two. The 3b:Mb electronic energies computed with the haTZ basis set indicate that Ar binds to the faces of the water clusters by at least 3 kJ mol-1 and by nearly 6 kJ mol-1 for one Ar(H2O)5 complex. An analysis of the interaction energies for the different binding motifs based on symmetry-adapted perturbation theory (SAPT) indicates that dispersion interactions are primarily responsible for the observed trends. The binding of a single Ar atom to a face of these cyclic water clusters can induce perturbations to the harmonic vibrational frequencies on the order of 5 cm-1 for some hydrogen-bonded OH stretching frequencies.
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Affiliation(s)
| | - Gregory S. Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677-1848, USA
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2
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Bertolini S, Delcorte A. Unraveling the Molecular Dynamics of Glucose Oxidase Desorption Induced by Argon Cluster Collision. J Phys Chem B 2023; 127:9074-9081. [PMID: 37820349 DOI: 10.1021/acs.jpcb.3c04857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
The bombardment of a protein multilayer target by an energetic argon cluster ion beam enables protein transfer onto a collector in the vacuum while preserving their bioactivity (iBEAM method). In parallel to this new soft-landing variant, protein transfer in the gas phase is a prerequisite for their characterization by mass spectrometry. The successful transfer of bioactive lysozymes (14 kDa) by cluster-induced soft landing and its mechanistic explanation by molecular dynamics (MD) simulations have sparked an important inquiry: Can heavier biomolecules be desorbed while maintaining their tridimensional structure and hence their bioactivity? To address this question, we employed MD simulations using a reactive force field (ReaxFF). Specifically, the Ar cluster-induced desorption of glucose oxidase from either a gold substrate or a lysozyme underlayer was modeled using the LAMMPS code. First, the force field parameters were trained by computing the dissociation energetics of a series of organic molecules with ReaxFF and DFT, in order to realistically describe N-S and O-S interactions in the bombarded glucose oxidase molecule. Second, bombardment simulations investigated the effects of cluster size (ranging from 1000 to 10000 Ar atoms) and kinetic energy (1.5 and 3.0 eV/atom) on the structural features and energetics of the desorbing glucose oxidase. Our results show that large argon clusters (≥7000) are needed to desorb glucose oxidase from a gold surface, yet protein fragmentation and/or pronounced denaturation occur. However, the transfer of structurally preserved glucose oxidase in the gas phase is predicted by the simulations when an organic layer is used as a substrate.
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Affiliation(s)
- Samuel Bertolini
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
| | - Arnaud Delcorte
- Institute of Condensed Matter and Nanoscience, Université catholique de Louvain, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium
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3
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Ghanmi C, Nakbi H, Al-Qarni HJ, Alharzali N, Berriche H. Structure, energetics, and spectroscopy of the K 2+(X 2Σ +g) interacting with the noble gas atoms Ar, Kr and Xe. J Mol Graph Model 2023; 120:108413. [PMID: 36758327 DOI: 10.1016/j.jmgm.2023.108413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 12/31/2022] [Accepted: 01/12/2023] [Indexed: 02/05/2023]
Abstract
The structure, energetic, and spectroscopy properties of the ionic system K2+(X2Σ+g) interacting with the noble gas atoms Argon, Krypton and Xenon are studied. The computations are done by an accurate ab initio approach based on the pseudo-potential technique, Gaussian basis sets, parameterized l-dependent polarization potentials and an analytic potential form for the K+Ar, K+Kr and K+Xe interactions. These interactions are added via the CCSD(T) potential taken from literature and fitted applying the analytical expression of Tang and Toennies. The application of the pseudo-potential approach reduces the number of active electrons of each complex to only one electron. The potential energy surfaces are analyzed on a large range of the Jacobi coordinates, R and θ. By the general interpolation outline based on the RKHS (Reproducing Kernel Hilbert Space) procedure, we have reproduced for each complex from our ab initio results the two-dimensional contour plots of an analytical potential. To evaluate the stability of each complex, we have determined from the potential energy surfaces the equilibrium distance (Re), the well depth (De), the quantum energy (D0), the zero-point-energy (ZPE) and the ZPE%. The results showed that the linear configurations, where the noble gas atom connected to the K2+(X2Σ+g) system, are the more stable.
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Affiliation(s)
- Chedli Ghanmi
- Laboratory of Interfaces and Advanced Materials, Faculty of Science, University of Monastir, 5019, Monastir, Tunisia.
| | - Haifa Nakbi
- Laboratory of Interfaces and Advanced Materials, Faculty of Science, University of Monastir, 5019, Monastir, Tunisia
| | - Hind Jahman Al-Qarni
- Physics Department, College of Science and Arts, Balqarn, Bisha University, Saudi Arabia
| | - Nisrin Alharzali
- Laboratory of Interfaces and Advanced Materials, Faculty of Science, University of Monastir, 5019, Monastir, Tunisia
| | - Hamid Berriche
- Laboratory of Interfaces and Advanced Materials, Faculty of Science, University of Monastir, 5019, Monastir, Tunisia; Mathematics and Natural Sciences Department, School of Arts and Sciences, American University of Ras Al Khaimah, Ras Al Khaimah, United Arab Emirates.
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4
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Mucha K, Pagacz-Kostrzewa M, Krupa J, Wierzejewska M. Structure and IR spectroscopic properties of complexes of 1,2,4-triazole and 3-amino-1,2,4-triazole with dinitrogen isolated in solid argon. Spectrochim Acta A Mol Biomol Spectrosc 2023; 285:121901. [PMID: 36182831 DOI: 10.1016/j.saa.2022.121901] [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: 05/16/2022] [Revised: 09/07/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
Complexes of 1,2,4-triazole (TR) and 3-amino-1,2,4-triazole (AT) with N2 were studied computationally employing MP2 and B3LYPD3 methods and experimentally by FTIR matrix isolation technique. The results show that both triazoles interact specifically with dinitrogen in several different ways. For the 1:1 complexes of 1,2,4-triazole five stable minima were located on the potential energy surface. The most stable of them comprises a weak hydrogen bond formed between the NH group of the ring and the lone pair of the nitrogen molecule. The second most stable structure is bound by the N⋯π bond formed between one of the N atoms of the N2 molecule and the triazole ring. Three other complexes are stabilized by the C-H⋯N and N⋯N van der Waals interactions. In the case of 3-amino-1,2,4-triazole, the two most stable dinitrogen complexes are analogous to those found for the 1,2,4-triazole and involve N-H⋯N and N⋯π bonds. In other structures amino or CH groups act as proton donors to the N2 molecule. The N⋯N van der Waals interactions are also present. The analysis of the infrared spectra of low temperature matrices containing TR or AT and dinitrogen indicates that in both systems mostly 1:1 hydrogen-bonded complexes with the NH group interacting with N2 are present in solid argon.
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Affiliation(s)
- K Mucha
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - M Pagacz-Kostrzewa
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - J Krupa
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - M Wierzejewska
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
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5
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Pagacz-Kostrzewa M, Mucha K, Wierzejewska M, Filarowski A. UV Laser-Induced Phototransformations of Matrix-Isolated 5-Chloro-3-nitro-2-hydroxyacetophenone. Int J Mol Sci 2023; 24:ijms24021546. [PMID: 36675062 PMCID: PMC9864230 DOI: 10.3390/ijms24021546] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 12/27/2022] [Accepted: 01/09/2023] [Indexed: 01/14/2023] Open
Abstract
Conformational changes of 5-chloro-3-nitro-2-hydroxyacetophenone were studied by experimental and theoretical methods. Phototransformations of the compound were induced in low-temperature argon matrices by using UV radiation, which was followed by FT-IR measurements. Two types of changes within the molecule were detected: rotations of the hydroxyl and acetyl groups. A new conformer without an intramolecular hydrogen bond was generated upon irradiation with λ = 330 nm, whereas the reverse reaction was observed at 415 nm.
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Lopes Jesus AJ, de Lucena Júnior JR, Fausto R, Reva I. Infrared Spectra and Phototransformations of meta-Fluorophenol Isolated in Argon and Nitrogen Matrices. Molecules 2022; 27:molecules27238248. [PMID: 36500356 PMCID: PMC9735537 DOI: 10.3390/molecules27238248] [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] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/18/2022] [Accepted: 11/21/2022] [Indexed: 11/29/2022]
Abstract
Monomers of meta-fluorophenol (mFP) were trapped from the gas phase into cryogenic argon and nitrogen matrices. The estimated relative energies of the two conformers are very close, and in the gas phase they have nearly equal populations. Due to the similarity of their structures (they only differ in the orientation of the OH group), the two conformers have also similar predicted vibrational signatures, which makes the vibrational characterization of the individual rotamers challenging. In the present work, it has been established that in an argon matrix only the most stable trans conformer of mFP exists (the OH group pointing away from the fluorine atom). On the other hand, the IR spectrum of mFP in a nitrogen matrix testifies to the simultaneous presence in this matrix of both the trans conformer and of the higher-energy cis conformer (the OH group pointing toward the fluorine atom), which is stabilized by interaction with the matrix gas host. We found that the exposition of the cryogenic N2 matrix to the Globar source of the infrared spectrometer affects the conformational populations. By collecting experimental spectra, either in the full mid-infrared range or only in the range below 2200 cm-1, we were able to reliably distinguish two sets of experimental bands originating from individual conformers. A comparison of the two sets of experimental bands with computed infrared spectra of the conformers allowed, for the first time, the unequivocal vibrational identification of each of them. The joint implementation of computational vibrational spectroscopy and matrix-isolation infrared spectroscopy proved to be a very accurate method of structural analysis. Some mechanistic insights into conformational isomerism (the quantum tunneling of hydrogen atom and vibrationally-induced conformational transformations) have been addressed. Finally, we also subjected matrix-isolated mFP to irradiations with UV light, and the phototransformations observed in these experiments are also described.
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Affiliation(s)
- A. J. Lopes Jesus
- CQC-IMS, Faculty of Pharmacy, University of Coimbra, 3004-295 Coimbra, Portugal
- Correspondence: (A.J.L.J.); (I.R.)
| | | | - Rui Fausto
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Igor Reva
- CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
- CIEPQPF, Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
- Correspondence: (A.J.L.J.); (I.R.)
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7
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Bakhshzadmahmoudi M, Morshedian N, Mehramiz A, Kharaghani M. Inactivation of Escherichia coli by atmospheric pressure plasma jet in water. J Water Health 2022; 20:962-971. [PMID: 35768970 DOI: 10.2166/wh.2022.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The main aim of this work is inactivation of Escherichia coli in water using a laboratory-scale radio-frequency atmospheric pressure Argon plasma jet. This bacterium is widely present in the environment, especially in drinking water, and its pathogenic effects are very harmful. For this purpose, an Argon flow rate of 3.5 slm, maximum plasma power of 200 W, and discharge frequency of 13.56 MHz was conducted to generate a uniform plasma plume for water treatment. 150 ml of drinking water contaminated by E. coli was exposed to the radiation of plasma placed about 3 cm within the water, the treatment time varied from 2 to 6 minutes at 100, 150, and 200 W of plasma input power. The temperature of the plume, discharge current and voltage, and electron density were all measured to characterize the plasma. Active species such as excited molecules, ions, and radicals produced in the plasma in water were detected using the optical emission spectroscopy method. The decreasing behavior of live bacteria versus exposure time and plasma jet input power was observed, and finally, at the discharge power of 200 W and 6 min, an effective inactivation was achieved and the number of bacteria reduced from 92×104 to less than 1.7 MPN/100 ml.
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Affiliation(s)
- Mehdi Bakhshzadmahmoudi
- Plasma and Nuclear Fusion Research School, Nuclear Science and Technologies Institute, Tehran, Iran E-mail:
| | - Nader Morshedian
- Plasma and Nuclear Fusion Research School, Nuclear Science and Technologies Institute, Tehran, Iran E-mail:
| | - Ahmad Mehramiz
- Department of Physics, Faculty of Science, Imam Khomeini International University, Qazvin, Iran
| | - Manijeh Kharaghani
- Department of Physics, Faculty of Science, Imam Khomeini International University, Qazvin, Iran
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Demaude A, Baert K, Petitjean D, Zveny J, Goormaghtigh E, Hauffman T, Gordon MJ, Reniers F. Simple and Scalable Chemical Surface Patterning via Direct Deposition from Immobilized Plasma Filaments in a Dielectric Barrier Discharge. Adv Sci (Weinh) 2022; 9:e2200237. [PMID: 35343108 PMCID: PMC9130873 DOI: 10.1002/advs.202200237] [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] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/10/2022] [Indexed: 06/14/2023]
Abstract
In this work, immobilization of the often unwanted filaments in dielectric barrier discharges (DBD) is achieved and used for one-step deposition of patterned coatings. By texturing one of the dielectric surfaces, a discharge containing stationary plasma filaments is ignited in a mix of argon and propargyl methacrylate (PMA) in a reactor operating at atmospheric pressure. From PMA, hydrophobic and hydrophilic chemical and topographical contrasts at sub-millimeter scale are obtained on silicon and glass substrates. Chemical and physical characterizations of the samples are performed by micrometer-scale X-ray photoelectron spectroscopy and infrared imaging and by water contact angle and profilometry, respectively. From the latter and additional information from high-speed imaging of the plasma phase and electrical measurements, it is suggested that filaments, denser in energetic species, lead to higher deposition rate with higher fragmentation of the precursor, while surface discharges igniting outwards the filaments are leading to smoother and slower deposition. This work opens a new route for a one-step large-area chemical and morphological patterning of surfaces at sub-millimeter scales. Moreover, the possibility to separately deposit coatings from filaments and the surrounding plasma phase can be helpful to better understand the processes occurring during plasma polymerization in filamentary DBD.
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Affiliation(s)
- Annaëlle Demaude
- Faculty of SciencesChemistry of SurfacesInterfaces and Nanomaterials (ChemSIN)Université libre de BruxellesAvenue F.D. Roosevelt 50, CP 255BrusselsB‐1050Belgium
| | - Kitty Baert
- Faculty of EngineeringDepartment of Materials and ChemistryElectrochemical and Surface Engineering Research Group (SURF)Vrije Universiteit BrusselPleinlaan 2BrusselsB‐1050Belgium
| | - David Petitjean
- Faculty of SciencesChemistry of SurfacesInterfaces and Nanomaterials (ChemSIN)Université libre de BruxellesAvenue F.D. Roosevelt 50, CP 255BrusselsB‐1050Belgium
| | - Juliette Zveny
- Faculty of SciencesChemistry of SurfacesInterfaces and Nanomaterials (ChemSIN)Université libre de BruxellesAvenue F.D. Roosevelt 50, CP 255BrusselsB‐1050Belgium
| | - Erik Goormaghtigh
- Structure and Function of Biological MembranesCenter for Structural Biology and BioinformaticsUniversité libre de BruxellesAvenue F.D. Roosevelt 50, CP 206/2BrusselsB‐1050Belgium
| | - Tom Hauffman
- Faculty of EngineeringDepartment of Materials and ChemistryElectrochemical and Surface Engineering Research Group (SURF)Vrije Universiteit BrusselPleinlaan 2BrusselsB‐1050Belgium
| | - Michael J. Gordon
- Department of Chemical EngineeringEng II #3351University of California – Santa BarbaraSanta BarbaraCA93106‐5080USA
| | - François Reniers
- Faculty of SciencesChemistry of SurfacesInterfaces and Nanomaterials (ChemSIN)Université libre de BruxellesAvenue F.D. Roosevelt 50, CP 255BrusselsB‐1050Belgium
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9
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Yoshimura S, Sugimoto S, Takeuchi T, Murai K, Kiuchi M. Low-energy Ar+ and N+ ion beam induced chemical vapor deposition using hexamethyldisilazane for the formation of nitrogen containing SiC and carbon containing SiN films. PLoS One 2021; 16:e0259216. [PMID: 34705881 PMCID: PMC8550407 DOI: 10.1371/journal.pone.0259216] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 10/14/2021] [Indexed: 11/18/2022] Open
Abstract
We proposed an experimental methodology for producing films on substrates with an ion beam induced chemical vapor deposition (IBICVD) method using hexamethyldisilazane (HMDS) as a source material. In this study, both HMDS and ion beam were simultaneously injected onto a Si substrate. We selected Ar+ and N+ as the ion beam. The energy of the ion beam was 101 eV. Temperature of the Si substrate was set at 540 °C. After the experiments, films were found to be deposited on the substrates. The films were then analyzed by Fourier transform infrared (FTIR) spectroscopy, stylus profilometer, X-ray diffraction, atomic force microscopy, and X-ray photoelectron spectroscopy (XPS). The FTIR and XPS results showed that silicon carbide films containing small amount of nitrogen were formed when Ar+ ions were injected in conjunction with HMDS. On the other hand, in the cases of N+ ion beam irradiation, silicon nitride films involving small amount of carbon were formed. It was noted that no film deposition was observed when HMDS alone was supplied to the substrates without any ion beam injections.
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Affiliation(s)
- Satoru Yoshimura
- Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
- * E-mail:
| | - Satoshi Sugimoto
- Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
| | - Takae Takeuchi
- Department of Chemistry, Biology and Environmental Science, Faculty of Science, Nara Women’s University, Nara, Nara, Japan
| | - Kensuke Murai
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, Japan
| | - Masato Kiuchi
- Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
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10
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Li B, Pan L, Liu C, Zhang X. Molecular dynamics investigation of structure evolution and thermodynamics of Ni-Fe nanoparticles during inert gas condensation. J Mol Model 2021; 27:288. [PMID: 34536146 DOI: 10.1007/s00894-021-04908-9] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 09/08/2021] [Indexed: 10/20/2022]
Abstract
Synthesis of magnetic nanoparticles is relevant to many applications in the fields of catalysis, energy storage, and biomedicine. Understanding the growth mechanisms and morphology of nanoparticles during inert gas condensation is crucial to rationally improve the performance of the final nanoparticles. In this work, molecular dynamics simulations are carried out to study the structural and thermodynamic behavior of Ni-Fe nanoparticles from homogenous vapor phase in Ar atmosphere. It is revealed that the final morphology of the resulting nanoparticles presents a spherical shape by cluster coalescence at high temperatures where the small clusters are liquid droplets prior to their collisions. However, probabilistic nucleation and cluster growth indicate that the occurrence of spherical shape is more controlled by the probability limits for different Fe concentrations. Meanwhile, a larger inert gas density induces a more efficient cooling effect leading to a larger probability control of the cluster formation with non-spherical shape by agglomeration. Furthermore, the solidification of the as-formed Ni-Fe clusters is examined by evaluating the evolution of crystalline and amorphous structure. The linear scaling-down dependence of the solidification temperature on the reciprocal of the nanoparticle size clearly signifies a linear size-depression effect for the liquid-to-solid phase change of Ni-Fe nanoparticles. Our findings thus extend the current understanding of inert gas condensation behavior and mechanisms of Ni-Fe nanoparticles from an atomic/molecular perspective.
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Affiliation(s)
- Bei Li
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China.
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Lei Pan
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Changan Liu
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Xu Zhang
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China
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11
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Komasa S, Kusumoto T, Hayashi R, Takao S, Li M, Yan S, Zeng Y, Yang Y, Hu H, Kobayashi Y, Agariguchi A, Nishida H, Hashimoto Y, Okazaki J. Effect of Argon-Based Atmospheric Pressure Plasma Treatment on Hard Tissue Formation on Titanium Surface. Int J Mol Sci 2021; 22:ijms22147617. [PMID: 34299241 PMCID: PMC8307890 DOI: 10.3390/ijms22147617] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/08/2021] [Accepted: 07/13/2021] [Indexed: 01/07/2023] Open
Abstract
In this paper, we suggest that the atmospheric pressure plasma treatment of pure titanium metal may be useful for improving the ability of rat bone marrow cells (RBMCs) to induce hard tissue differentiation. Previous studies have reported that the use of argon gas induces a higher degree of hard tissue formation. Therefore, this study compares the effects of plasma treatment with argon gas on the initial adhesion ability and hard tissue differentiation-inducing ability of RBMCs. A commercially available titanium metal plate was used as the experimental material. A plate polished using water-resistant abrasive paper #1500 was used as the control, and a plate irradiated with argon mixed with atmospheric pressure plasma was used as the experimental plate. No structural change was observed on the surface of the titanium metal plate in the scanning electron microscopy results, and no change in the surface roughness was observed via scanning probe microscopy. X-ray photoelectron spectroscopy showed a decrease in the carbon peak and the formation of hydroxide in the experimental group. In the distilled water drop test, a significant decrease in the contact angle was observed for the experimental group, and the results indicated superhydrophilicity. Furthermore, the bovine serum albumin adsorption, initial adhesion of RBMCs, alkaline phosphatase activity, calcium deposition, and genetic marker expression of rat bone marrow cells were higher in the experimental group than those in the control group at all time points. Rat distal femur model are used as in vivo model. Additionally, microcomputed tomography analysis showed significantly higher results for the experimental group, indicating a large amount of the formed hard tissue. Histopathological evaluation also confirmed the presence of a prominent newly formed bone seen in the images of the experimental group. These results indicate that the atmospheric pressure plasma treatment with argon gas imparts superhydrophilicity, without changing the properties of the pure titanium plate surface. It was also clarified that it affects the initial adhesion of bone marrow cells and the induction of hard tissue differentiation.
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Affiliation(s)
- Satoshi Komasa
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
- Correspondence: ; Tel.: +81-72-864-3084; Fax: +81-72-864-3184
| | - Tetsuji Kusumoto
- Department of Japan Faculty of Health Sciences, Osaka Dental University, 1-4-4, Makino-honmachi, Hirakata-shi, Osaka 573-1121, Japan;
| | - Rina Hayashi
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Seiji Takao
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Min Li
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Sifan Yan
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Yuhao Zeng
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Yuanyuan Yang
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Hui Hu
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Yasuyuki Kobayashi
- Osaka Research Institute of Industrial Science and Technology, Morinomiya Center, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan;
| | - Akinori Agariguchi
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
| | - Hisataka Nishida
- Department of Advanced Hard Materials, The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;
| | - Yoshiya Hashimoto
- Department of Biomaterials, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan;
| | - Joji Okazaki
- Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1 Kuzuha-hanazono-cho, Hirakata, Osaka 573-1121, Japan; (R.H.); (S.T.); (M.L.); (S.Y.); (Y.Z.); (Y.Y.); (H.H.); (A.A.); (J.O.)
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12
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Smyk B. Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane. Molecules 2021; 26:molecules26030571. [PMID: 33499107 PMCID: PMC7865854 DOI: 10.3390/molecules26030571] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 01/17/2021] [Accepted: 01/19/2021] [Indexed: 11/24/2022] Open
Abstract
This paper presents the results of an investigation into the photooxidation of tocopherols (Tocs) dissolved in argonated and non-argonated n-hexane. During irradiation, steady-state absorption and fluorescence spectra as well as lifetimes were measured. In all experiments, the photoreactions were of the first order type. The reaction rate was higher for all Tocs in argonated solvent. A new emission band with a maximum at 298 nm as well as new absorption and fluorescence bands beyond the 300 nm connected with charge-transfer (C-T) complexes for all Tocs appeared during the irradiation of γ- and δ-Toc. The above results indicate that the photooxidation process is very complex and that the observed phenomena strongly depend on the number and position of methyl groups in the chromanol ring.
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Affiliation(s)
- Bogdan Smyk
- Department of Physics and Biophysics, The Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719 Olsztyn, Poland
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13
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Kotowska AM, Trindade GF, Mendes PM, Williams PM, Aylott JW, Shard AG, Alexander MR, Scurr DJ. Protein identification by 3D OrbiSIMS to facilitate in situ imaging and depth profiling. Nat Commun 2020; 11:5832. [PMID: 33203841 PMCID: PMC7672064 DOI: 10.1038/s41467-020-19445-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 10/09/2020] [Indexed: 01/23/2023] Open
Abstract
Label-free protein characterization at surfaces is commonly achieved using digestion and/or matrix application prior to mass spectrometry. We report the assignment of undigested proteins at surfaces in situ using secondary ion mass spectrometry (SIMS). Ballistic fragmentation of proteins induced by a gas cluster ion beam (GCIB) leads to peptide cleavage producing fragments for subsequent OrbitrapTM analysis. In this work we annotate 16 example proteins (up to 272 kDa) by de novo peptide sequencing and illustrate the advantages of this approach by characterizing a protein monolayer biochip and the depth distribution of proteins in human skin.
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Affiliation(s)
- Anna M Kotowska
- School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
| | | | - Paula M Mendes
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Philip M Williams
- School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Jonathan W Aylott
- School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Alexander G Shard
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK
| | | | - David J Scurr
- School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK.
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14
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Kletschkus K, Gelbrich N, Burchardt M, Kramer A, Bekeschus S, Stope MB. Emission of Ultraviolet Radiation from 220 to 280 NM by a Cold Physical Plasma Generating Device. Health Phys 2020; 119:153-159. [PMID: 32483047 DOI: 10.1097/hp.0000000000001276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The generation of cold physical plasma at atmospheric pressure (cold atmospheric plasma: CAP) generates different reactive molecular species as well as radiation in the ultraviolet (UV) range. The therapy of tumor diseases has proven to be a new promising area of application for CAP treatment. With regard to the routine use of CAP in cancer therapy, however, application safety must be ensured both for the patient and for the operator. In this study, the intensity of UVC radiation of the CAP device MiniJet-R (HF Technik, Aachen, Germany) was measured in the range from 220 to 280 nm depending on various device-specific parameters. Depending on the distance to the CAP flame, the UVC intensity reaches values up to 124.5±11 mW m. It should be noted here that the UVC radiation generated by the CAP is emitted in all orientations in the room but is also shielded by the geometry of the handpiece of the CAP device. The device-specific settings for the flow rate of the carrier gas, argon, and the power level at the high-frequency (HF) generator of the CAP device also influence the intensity of the UVC radiation. With regard to the medical use of the CAP device, it can be stated that there is an exposure to UVC radiation, which, depending on the duration of treatment, can also be above the maximum value legally specified in Europe. Shielding components on the CAP device can reduce UVC exposure to the operator as well as adverse side effects to the patient.
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Affiliation(s)
- Karsten Kletschkus
- Plasma Oncology Laboratory, Department of Urology, University Medicine Greifswald, Greifswald, Germany
| | - Nadine Gelbrich
- Plasma Oncology Laboratory, Department of Urology, University Medicine Greifswald, Greifswald, Germany
| | - Martin Burchardt
- Plasma Oncology Laboratory, Department of Urology, University Medicine Greifswald, Greifswald, Germany
| | - Axel Kramer
- Institute of Hygiene and Environmental Medicine, University Medicine Greifswald, Greifswald, Germany
| | - Sander Bekeschus
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Greifswald, Germany
| | - Matthias B Stope
- Plasma Oncology Laboratory, Department of Urology, University Medicine Greifswald, Greifswald, Germany
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15
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Pant B, Pant HR, Park M. Fe 1-xS Modified TiO 2 NPs Embedded Carbon Nanofiber Composite via Electrospinning: A Potential Electrode Material for Supercapacitors. Molecules 2020; 25:molecules25051075. [PMID: 32121021 PMCID: PMC7179207 DOI: 10.3390/molecules25051075] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/19/2020] [Accepted: 02/26/2020] [Indexed: 11/16/2022] Open
Abstract
Fe1-xS-TiO2 nanoparticles embedded carbon nanofibers (Fe1-xS-TiO2/CNFs) composite as a supercapacitor electrode material has been reported in the present work. The Fe1-xS-TiO2/CNFs composite was fabricated by electrospinning technique followed by carbonization under argon atmosphere and characterized by the state-of-art techniques. The electrochemical studies were carried out in a 2 M KOH electrolyte solution. The synthesized material showed a specific capacitance value of 138 F/g at the current density of 1 A/g. Further, the capacitance retention was about 83%. The obtained results indicate that the Fe1-xS-TiO2/CNFs composite can be recognized as electrode material in supercapacitor.
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Affiliation(s)
- Bishweshwar Pant
- Department of Biomedical Sciences and Institute for Medical Science, Jeonbuk National University Medical School, Chonbuk 54907, Korea;
| | - Hem Raj Pant
- Department of Applied Sciences, Tribhuvan University, Kathmandu 44600, Nepal;
| | - Mira Park
- Department of Biomedical Sciences and Institute for Medical Science, Jeonbuk National University Medical School, Chonbuk 54907, Korea;
- Correspondence:
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16
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Li R, Lu T, Xie M, Liu F. Analysis on thermal behavior of fluorides and cyanides for heat-treating spent cathode carbon blocks from aluminum smelters by TG/DSC-MS & ECSA®. Ecotoxicol Environ Saf 2020; 189:110015. [PMID: 31830602 DOI: 10.1016/j.ecoenv.2019.110015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 09/01/2019] [Revised: 11/23/2019] [Accepted: 11/26/2019] [Indexed: 06/10/2023]
Abstract
This paper adopts a novel data-processing method of ECSA® based on TG/DSC-MS system to basically study the characteristics of release and conversion of fluorides and cyanides during heat treatment of the spent cathode carbon block (SCCB). All the experiments were conducted at 10 K⋅min-1 heating rate and under Ar or Ar-O2 atmospheres. The results indicate that the release of fluorides was just a steady but slow phase transition process under both Ar and Ar-O2 atmospheres, which can be comparatively accelerated when the carbon material was burnt. The cyanides were effectively decomposed at high temperature and at Ar-O2 atmosphere, with around three quarters of the cyanides being converted to the N2 and nearly a quarter being to the NO. Finally, analysis on the flue gas composition indicates that it had a more complicated composition of CO2, N2, NO, NO2, HCN under Ar-O2 atmosphere but only had a composition of CO2 and NO under Ar atmosphere.
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Affiliation(s)
- Rongbin Li
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Tingting Lu
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Mingzhuang Xie
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Fengqin Liu
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
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17
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Abstract
BACKGROUND AND OBJECTIVE Atmospheric pressure plasma jet (APPJ) gained great interest due to its effectiveness as selective non-lethal technique with low operational costs. In this study, argon APPJ system was designed and the generated cold plasma was applied in disinfection of microbial cells. MATERIALS AND METHODS Argon APPJ was generated by blowing argon through capillary metallic tube inserted in alumina and powered by 8-25 kHz sinusoidal voltage waveform. The plasma applied in inactivation of microbes by direct exposure of cell suspension, approximately 10 mm below jet nozzle, for different intervals. Interference of organics in exposure medium, on lethal activity of plasma was investigated. RESULTS APPJ jet induced high levels of reactive oxygen (ROS) and nitrogen species (RNS). Jet length increased with applied voltage and flow rate in laminar mode, but decreased with flow rate in turbulent mode. Percent reduction in living cell count was 98.3 and 94.1%, for E. coli and S. aureus suspended in water after 30s of exposure, respectively, with 2.7- and 2-folds increase in plasma lethal activity, as compared with LB broth medium. D-values (Decimal Reduction Time) were increased from 34-333, 37-476 and 139-385 s for E. coli, S. aureus and C. albicans in water and complex liquid organic media, respectively. CONCLUSION Designed argon APPJ system can be used in disinfection of different microbes. Plasma antimicrobial activity drastically decreased in presence of organic matter. The generated plasma can be promising approach for treatment of diseases, especially caused by antibiotic-resistant pathogens.
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18
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Nycz M, Paradowska E, Arkusz K, Pijanowska DG. Influence of geometry and annealing temperature in argon atmosphere of TiO2 nanotubes on their electrochemical properties. Acta Bioeng Biomech 2020; 22:165-177. [PMID: 32307458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
PURPOSE In this paper, electrochemical properties of the as-formed and thermally treated titanium dioxide (TiO2) nanotubes with diameter in the range of 20-100 nm and height in the range of 100-1000 nm were presented. In addition, the effects of annealing temperature (450-550 °C) on the electrochemical characteristics of these structures, as well as the influence of diameter and height of TiO2 nanotubes on these properties were examined. The results were referred to a compact TiO2 layer (100 nm thick). METHODS The electrochemical test included open circuit potential, impedance spectroscopy and cyclic voltammetry measurements. The scanning electron microscope with energy dispersive spectroscopy analyser, x-ray photoelectron spectroscopy, and x-ray diffraction analysers were used for surface morphology characterisation as well as elemental, phase and chemical composition of TiO2 layers. RESULTS It was found that nanotubes with the diameter of 50 and 75 nm (height of 1000 nm) annealed at 550 °C exhibit the lowest impedance and phase angle values. However, the voltammetric detection of potassium ferricyanide indicated that the closest to 1 Ipc /Ipa ratio were shown by nanotubes with a diameter of 50 and 75 nm annealed at 450 °C. CONCLUSIONS On the basis of performed analysis, it can be stated that the TiO2 layer with nanotubes of 50 nm in diameter and of 1000 nm in height, annealed in 450 °C may be indicated as the ones having the most favourable sensing and biosensing properties.
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Affiliation(s)
- Marta Nycz
- Department of Biomedical Engineering, Faculty of Mechanical Engineering, University of Zielona Góra, Zielona Góra, Poland
| | - Ewa Paradowska
- Department of Biomedical Engineering, Faculty of Mechanical Engineering, University of Zielona Góra, Zielona Góra, Poland
| | - Katarzyna Arkusz
- Department of Biomedical Engineering, Faculty of Mechanical Engineering, University of Zielona Góra, Zielona Góra, Poland
| | - Dorota Genowefa Pijanowska
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
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19
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Feng X, Ma X, Liu H, Xie J, He C, Fan R. Argon plasma effects on maize: pesticide degradation and quality changes. J Sci Food Agric 2019; 99:5491-5498. [PMID: 31095729 DOI: 10.1002/jsfa.9810] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 02/11/2019] [Revised: 04/18/2019] [Accepted: 05/13/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND During planting, storage and transportation of maize excessive amounts of pesticides are used to ensure production, resulting in pesticide residues on the maize that can threaten human health. Plasma, compared with other technologies, has been widely regarded as a green, safe and promising technology for surface decontamination to ensure maize safety and quality. RESULTS The aim of this study is to discuss plasma effects on the degradation of chlorpyrifos and carbaryl on maize surface and the changes of treated maize quality. Results achieved the largest degradation efficiency of chlorpyrifos and carbaryl, up to 91.5% and 73.1%, respectively. The physical changes of maize were observed by scanning electron microscopy (SEM), showing a decrease in contact angle, an increase in surface free energy and polar component, leading to improved hydrophilicity of the treated maize. There was no significant change of vitamin B2 content of maize. A significant increase of acid value and decrease of moisture content and starch content were observed within acceptable limits. CONCLUSION It is reasonable to believe that argon plasma treatment enhances the edible safety of maize while maintaining maize quality. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Xinxin Feng
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Xin Ma
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Hongxia Liu
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Jinzhuo Xie
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Chi He
- Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Rui Fan
- State Key Laboratory of Electronic Physics and Devices, Xi'an Jiaotong University, Xi'an, P. R. China
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20
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Alyafei HFSG, Fu W, Zalnezhad E, Jaber F, Hamouda AMS, Musharavati F, Bae S. Properties Investigation of GO/HA/Pt Composite Thin Film. Biomed Res Int 2019; 2019:4847932. [PMID: 31321236 PMCID: PMC6610737 DOI: 10.1155/2019/4847932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 04/23/2019] [Accepted: 05/22/2019] [Indexed: 11/24/2022]
Abstract
Hydroxyapatite/graphene oxide/platinum (HA/GO/Pt) nanocomposite was synthesized and electrodeposited on a pure zirconium substrate. The coated zirconium was annealed at 200, 300, 400, and 600°C in vacuum furnace in presence of argon gas. The structure and morphology of the coated samples were characterized. Biocompatibility and wear and corrosion resistances of specimens were examined. The result of corrosion tests shows that the graphene into HA/Pt composites significantly improves their corrosion resistance. The wear tests results of uncoated and coated samples before and after annealing show that coated samples annealed at 300°C had better wear resistance compared with uncoated and coated samples at other temperatures. Furthermore, the biocompatibility test shows that the coatings improved the cell attachment and proliferation compared to the pure zirconium substrate.
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Affiliation(s)
- Huda F. S. G. Alyafei
- Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, 2713 Doha, Qatar
| | - W. Fu
- Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea
| | - E. Zalnezhad
- Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea
- Biomechacin LLC, San Antonio, TX 78251, USA
| | - F. Jaber
- Department of Biomedical Engineering, Ajman University, UAE
| | - A. M. S. Hamouda
- Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, 2713 Doha, Qatar
| | - F. Musharavati
- Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, 2713 Doha, Qatar
| | - S. Bae
- Department of Architectural Engineering, Hanyang University, Seoul 04763, Republic of Korea
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21
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Matsumoto Y, Furusawa Y, Aoki-Nakano M, Matsufuji N, Hirayama R, Kanai T, Ando K, Sakurai H. ESTIMATION OF RBE VALUES FOR CARBON-ION BEAMS IN THE WIDE DOSE RANGE USING MULTICELLULAR SPHEROIDS. Radiat Prot Dosimetry 2019; 183:45-49. [PMID: 30624731 DOI: 10.1093/rpd/ncy269] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Indexed: 06/09/2023]
Abstract
Hypofractionated carbon-ion therapy has been applied to treatment of several tumours. In this case, relative biological effectiveness (RBE) at high dose region must be considered, however, the RBE calculated physically has been not verified biologically. In this study, spheroid technique was adopted to estimate RBE in wide dose range. Cells were irradiated with X-rays and heavy-ions with LET of 13, 35, 100 and 300 keV/μm with monolayer and spheroid condition. Surviving fractions in wide dose range (0-15 Gy) were obtained to combined monolayer with spheroid survival data. The linear-quadratic and multi-target single-hit equation fitted well in survival data at low dose, and high dose region, respectively. A multi-process equation showed best fitting for survival data in wide dose range. RBE values of heavy-ions could be estimated by combination of monolayer and spheroid data. The values converged at 1.1-1.4 and varied by LET values at high and low dose region, respectively.
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Affiliation(s)
- Yoshitaka Matsumoto
- Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
- Proton Medical Research Center, University of Tsukuba Hospital, 2-1-1 Amakubo, Tsukuba, Ibaraki, Japan
| | - Yoshiya Furusawa
- National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, Japan
| | - Mizuho Aoki-Nakano
- National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, Japan
| | - Naruhiro Matsufuji
- National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, Japan
| | - Ryoichi Hirayama
- National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, Japan
| | - Tatsuaki Kanai
- Heavy Ion Medical Center, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, Japan
| | - Koichi Ando
- Heavy Ion Medical Center, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma, Japan
| | - Hideyuki Sakurai
- Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
- Proton Medical Research Center, University of Tsukuba Hospital, 2-1-1 Amakubo, Tsukuba, Ibaraki, Japan
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22
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Kabir AH, Rahman MM, Das U, Sarkar U, Roy NC, Reza MA, Talukder MR, Uddin MA. Reduction of cadmium toxicity in wheat through plasma technology. PLoS One 2019; 14:e0214509. [PMID: 30933989 PMCID: PMC6443147 DOI: 10.1371/journal.pone.0214509] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 03/14/2019] [Indexed: 01/10/2023] Open
Abstract
Cadmium (Cd) contamination in plant-derived food is a big concern. This study examines whether and how Ar/O2 and Ar/Air plasma techniques lead to Cd detoxification in wheat. Treatment with Ar/O2 and Ar/Air changed the seed surface and decreased the pH of seeds as well as the cultivation media. Generally, plants subjected to Cd treatment from seeds treated with Ar/O2and Ar/Air plasma showed considerable progress in morphology and total chlorophyll synthesis compared to Cd-treated wheat, suggesting that plasma technology is effective for Cd detoxification. Furthermore, Ar/O2 and Ar/Air plasma treated plants showed a significant decrease in root and shoot Cd concentration, which is consistent with the reduced expression of Cd transporters in the root (TaLCT1 and TaHMA2) compared with the plants not treated with plasma in response to Cd stress. This Cd inhibition is possibly accomplished by the decrease of pH reducing the bioavailability of Cd in the rhizosphere. These observations are in line with maintenance of total soluble protein along with reduced electrolyte leakage and cell death (%) in root and shoot due to Ar/O2 and Ar/Air treatments. Further, Cd-induced elevated H2O2 or oxidative damage in tissues was mainly diminished through the upregulation of antioxidant enzymes (SOD and CAT) and their corresponding genes (TaSOD and TaCAT) induced by Ar/O2 and Ar/Air plasma. Grafting results suggest that root originating nitric oxide signal possibly drives the mechanisms of Cd detoxification due to plasma treatment in wheat. These findings provide a novel and eco-friendly use of plasma technology for the mitigation of Cd toxicity in wheat plants.
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Affiliation(s)
- Ahmad Humayan Kabir
- Molecular Plant Physiology Laboratory, Department of Botany, University of Rajshahi, Rajshahi, Bangladesh
- * E-mail:
| | - Md Mosiur Rahman
- Molecular Plant Physiology Laboratory, Department of Botany, University of Rajshahi, Rajshahi, Bangladesh
| | - Urmi Das
- Molecular Plant Physiology Laboratory, Department of Botany, University of Rajshahi, Rajshahi, Bangladesh
| | - Urmi Sarkar
- Molecular Plant Physiology Laboratory, Department of Botany, University of Rajshahi, Rajshahi, Bangladesh
| | - Nepal Chandra Roy
- Plasma Science and Technology Laboratory, Department of Applied Physics and Electronic Engineering, University of Rajshahi, Rajshahi, Bangladesh
| | - Md Abu Reza
- Molecular Biology and Protein Science Laboratory, Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi, Bangladesh
| | - Mamunur Rashid Talukder
- Plasma Science and Technology Laboratory, Department of Applied Physics and Electronic Engineering, University of Rajshahi, Rajshahi, Bangladesh
| | - Md Alfaz Uddin
- Department of Physics, University of Rajshahi, Rajshahi, Bangladesh
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23
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González-Henríquez CM, Veliz-Silva DF, Sarabia-Vallejos MA, Del Campo-García A, Rodríguez-Hernández J. Micrometric Wrinkled Patterns Spontaneously Formed on Hydrogel Thin Films via Argon Plasma Exposure. Molecules 2019; 24:E751. [PMID: 30791473 PMCID: PMC6412580 DOI: 10.3390/molecules24040751] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 02/02/2019] [Accepted: 02/13/2019] [Indexed: 11/16/2022] Open
Abstract
The generation of microstructured patterns on the surface of a specific polymeric material could radically improve their performance in a particular application. Most of the interactions with the environment occur at the material interface; therefore, increasing the exposed active surface considerably improves their range of application. In this article, a simple and reliable protocol to form spontaneous wrinkled patterns using a hydrogel layer is reported. For this purpose, we took advantage of the doctor blade technique in order to generate homogenous films over solid substrates with controlled thickness and large coverage. The hydrogel wrinkle formation involves a prepolymerization step which produces oligomers leading to a solution with increased viscosity, enough for doctor blade deposition. Subsequently, the material was exposed to vacuum and plasma to trigger wrinkled pattern formation. Finally, a UV-polymerization treatment was applied to fix the undulations on top. Interestingly, the experimental parameters allowed us to finely tune the wrinkle characteristics (period, amplitude, and orientation). For this study, two main aspects were explored. The first one is related to the role of the substrate functionalization on the wrinkle formation. The second study correlates the deswelling time and its relationship with the dimensions and distribution of the wrinkle pattern. In the first batch, four different 3-(trimethoxysilyl)propyl methacrylate (TSM) concentrations were used to functionalize the substrate in order to enhance the adhesion between hydrogel film and the substrate. The wrinkles formed were characterized in terms of wrinkle amplitude, wavelength, pattern roughness, and surface Young modulus, by using AFM in imaging and force spectroscopy modes. Moreover, the chemical composition of the hydrogel film cross-section and the effect of the plasma treatment were analyzed with confocal Raman spectroscopy. These results demonstrated that an oxidized layer was formed on top of the hydrogel films due to the exposure to an argon plasma.
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Affiliation(s)
- Carmen M González-Henríquez
- Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Departamento de Química, Universidad Tecnológica Metropolitana, Las Palmeras 3360, Santiago 7800003, Chile.
- Programa Institucional de Fomento a la Investigación, Desarrollo e Innovación, Universidad Tecnológica Metropolitana, Ignacio Valdivieso 2409, Santiago 8940577, Chile.
| | - Diego F Veliz-Silva
- Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Departamento de Química, Universidad Tecnológica Metropolitana, Las Palmeras 3360, Santiago 7800003, Chile.
| | - Mauricio A Sarabia-Vallejos
- Escuela de Ingeniería, Departamento de Ingeniería Estructural y Geotecnia, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago 7820436, Chile.
- Escuela de Ingeniería, Instituto de Ingeniería Biológica y Médica, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Santiago 7820436, Chile.
| | - Adolfo Del Campo-García
- Ceramics for Smart Systems Group, Departamento de Electrocerámicos, Instituto de Cerámica y Vidrio- Consejo Superior de Investigaciones Científicas (ICV-CSIC), Kelsen 5, Madrid 28049, Spain.
| | - Juan Rodríguez-Hernández
- Polymer Functionalization Group. Instituto de Ciencia y Tecnología de Polímeros-Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Departamento de Química Macromolecular Aplicada, Juan de la Cierva 3, Madrid 28006, Spain.
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Barysheva MM, Chkhalo NI, Drozdov MN, Mikhailenko MS, Pestov AE, Salashchenko NN, Vainer YA, Yunin PA, Zorina MV. X-ray scattering by the fused silica surface etched by low-energy Ar ions. J Xray Sci Technol 2019; 27:857-870. [PMID: 31282467 DOI: 10.3233/xst-190495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Anomalously high x-ray scattering at a wavelength of 0.154 nm by super-polished substrates of fused silica, which were etched by the argon ions with the energy of 300 eV, is detected. The scattering intensity increases monotonically with increasing of the etching depth. The effect is explained by the scattering on the volume inhomogeneities with the lateral size greater than 0.5 μm of the subsurface "damaged" layer. The concentration of volume inhomogeneities increases with the increase of the fluence of argon ions, but the concentration of implanted argon atoms in the layer quickly reaches the maximum value and then begins a trend of going down. The thickness of the "damaged" layer is approximately equal to the penetration depth of the Ar atoms and can be directly determined from the x-ray specular reflection. It is shown that the presence of volume inhomogeneities of the subsurface "damaged" layer does not affect the geometric roughness of the surface. The observed effect imposes limitations on the usage of grazing incidence x-ray optics without reflective coatings and of the diffuse x-ray scattering (DXRS) method for studying the substrate roughness. A new method that potentially enables to evaluate the applicability of the DXRS method in practice is proposed.
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Affiliation(s)
- M M Barysheva
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - N I Chkhalo
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - M N Drozdov
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - M S Mikhailenko
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - A E Pestov
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - N N Salashchenko
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - Y A Vainer
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - P A Yunin
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - M V Zorina
- Institute for Physics of Microstructures of the Russian Academy of Sciences, Nizhny Novgorod, Russia
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Chizoba Ekezie FG, Cheng JH, Sun DW. Effects of Mild Oxidative and Structural Modifications Induced by Argon Plasma on Physicochemical Properties of Actomyosin from King Prawn ( Litopenaeus vannamei). J Agric Food Chem 2018; 66:13285-13294. [PMID: 30452258 DOI: 10.1021/acs.jafc.8b05178] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In the present work, the structure and physicochemical properties of natural actomyosin (NAM) extracted from king prawn ( Litopenaeus vannamei) and subjected to atmospheric pressure plasma jet (APPJ) generated in argon gas as a function of the treatment time were examined. The results revealed that prawn NAM exhibited a correlating decrease in pH from 7.06 ± 0.03 to 6.92 ± 0.02 and a slight increase ( p > 0.05) in solubility from 91.89 ± 1.57 to 96.86 ± 1.19 within the first few minutes of plasma exposure as a result of the formation of soluble aggregates. A rise in turbidity was also noted, confirming the occurrence of protein aggregation. These changes were also accompanied by a rise in emulsifying activity from 48.96 ± 1.66 to 67.31 ± 1.39 m2/g ( p < 0.05) and a nearly 50% increase in foaming capacity after 5 min of APPJ exposure. The modulation of these properties occurred as a result of conformational changes in NAM evident by various complementary structural analyses conducted. Overall, these findings show that mild oxidation from argon plasma can be used for modification of protein functionality and emphasize the need for optimal selection of plasma processing conditions.
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Affiliation(s)
- Flora-Glad Chizoba Ekezie
- School of Food Science and Engineering , South China University of Technology , Guangzhou , Guangdong 510641 , People's Republic of China
| | - Jun-Hu Cheng
- School of Food Science and Engineering , South China University of Technology , Guangzhou , Guangdong 510641 , People's Republic of China
| | - Da-Wen Sun
- School of Food Science and Engineering , South China University of Technology , Guangzhou , Guangdong 510641 , People's Republic of China
- Food Refrigeration and Computerized Food Technology , University College Dublin, National University of Ireland , Agriculture and Food Science Centre, Belfield, Dublin 4 , Ireland
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Smeets R, Henningsen A, Heuberger R, Hanisch O, Schwarz F, Precht C. Influence of UV Irradiation and Cold Atmospheric Pressure Plasma on Zirconia Surfaces: An In Vitro Study. Int J Oral Maxillofac Implants 2018; 34:329–336. [PMID: 30521659 DOI: 10.11607/jomi.7017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE To compare the influence of ultraviolet (UV) irradiation and cold atmospheric pressure plasma (CAP) treatment on surface structure, surface chemistry, cytocompatibility, and cell behavior on zirconia in vitro. MATERIALS AND METHODS Zirconia samples (TZ-3YSBE) were treated by UV irradiation, oxygen plasma, or argon plasma for 12 minutes each and compared with the nontreated samples. Surface analysis was conducted using scanning electron microscopy, roughness analysis, and x-ray photoelectron spectroscopy. Cell proliferation, viability, and cell attachment as well as cytotoxicity were evaluated using MC3T3-E1 murine osteoblasts cultivated directly on the zirconia samples. RESULTS Surface structure and roughness were not affected by the surface treatments. CAP and UV irradiation significantly reduced organic material and increased the surface oxidation on the zirconia samples. Furthermore, CAP and UV treatment significantly decreased the contact angle on the zirconia samples, indicating superhydrophilicity. Cell attachment was significantly increased on oxygen plasma-treated zirconia samples compared with the nontreated samples at all times (P < .001). After 24 and 48 hours, cell proliferation and viability (P < .001) were significantly increased on oxygen plasma-treated samples in comparison with the nontreated, UV-treated, and argon plasma-treated samples. Neither UV nor CAP treatment led to cytotoxicity. CONCLUSION In vitro, surface treatment by UV irradiation or CAP causes a significant reduction of organic material, increases the hydrophilicity of zirconia, and improves the conditions for osteoblasts. Results stipulate that treatment of zirconia surfaces with oxygen plasma may favor cell proliferation.
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Hu YB, Lo SL, Li YF, Lee YC, Chen MJ, Lin JC. Autocatalytic degradation of perfluorooctanoic acid in a permanganate-ultrasonic system. Water Res 2018; 140:148-157. [PMID: 29704759 DOI: 10.1016/j.watres.2018.04.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 01/12/2018] [Revised: 04/17/2018] [Accepted: 04/18/2018] [Indexed: 06/08/2023]
Abstract
An autocatalytic system, permanganate-ultrasonic (PM-US) system, was applied to degrade perfluorooctanoic acid (PFOA) in aqueous solutions. After a 120-min ultrasonication, a PM dosage of 6 mM increased the pseudo first-order rate constant (k1) for PFOA decomposition from 3.5 × 10-3 to 13.0 × 10-3 min-1 and increased the pseudo zeroth-order rate constant (k2) for PFOA defluorination from 1.5 × 10-3 to 7.9 × 10-3 mM·min-1, respectively. The PFOA degradation rates increased proportionally with the enhanced production rates of MnO2 particles. An initial pH 4 condition was optimal for the PFOA degradation compared to highly acidic and neutral conditions. PFOA degradation could be significantly facilitated by increasing power density of ultrasonication from 60 to 180 W·L-1. While increasing solution temperature to 50 °C only slightly promoted the PFOA decomposition and defluorination to 1.15 and 1.07 times of that at 30 °C, respectively. The solution saturated with argon was more favorable for the PFOA degradation in the PM-US system than that saturated with air and oxygen. Co-dissolved Cu(II), Fe(II) and Fe(III) ions inhibited the PFOA degradation by forming metal-PFOA complexes. Based on the experimental results and intermediates analysis, mechanisms and pathways of PFOA decomposition and defluorination in the PM-US system were proposed.
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Affiliation(s)
- Yi-Bo Hu
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 106, Taiwan
| | - Shang-Lien Lo
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 106, Taiwan.
| | - Yueh-Feng Li
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 106, Taiwan
| | - Yu-Chi Lee
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 106, Taiwan
| | - Meng-Jia Chen
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 106, Taiwan
| | - Jo-Chen Lin
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 106, Taiwan
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Canullo L, Genova T, Mandracci P, Mussano F, Abundo R, Fiorellini JP. Morphometric Changes Induced by Cold Argon Plasma Treatment on Osteoblasts Grown on Different Dental Implant Surfaces. INT J PERIODONT REST 2018; 37:541-548. [PMID: 28609500 DOI: 10.11607/prd.2916] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Treatments for enhancing surface energy were studied in an effort to create a more favorable environment for cell adhesion. Cold argon plasma (CAP) is able to improve titanium-cell contact, producing hydrophilic surfaces with higher wettability. The aim of this in vitro study was to estimate the early cell morphology after CAP treatment of different commercially available titanium surfaces. Surface wettability was significantly augmented in all the treated samples. The authors investigated how CAP affected the behavior of osteoblasts by evaluating the cell morphology outcome. Cell surface areas differed in a statistically significant way when plasma-treated samples were compared to the untreated ones. The positive effect of CAP was shown on smooth, moderately rough, and rough implant surfaces.
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Canullo L, Genova T, Wang HL, Carossa S, Mussano F. Plasma of Argon Increases Cell Attachment and Bacterial Decontamination on Different Implant Surfaces. Int J Oral Maxillofac Implants 2018; 32:1315-1323. [PMID: 29140375 DOI: 10.11607/jomi.5777] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE This in vitro study tested the effects of argon atmospheric pressure dielectric barrier discharge (APDBD) on different implant surfaces with regard to physical changes, bacterial decontamination, and osteoblast adhesion. MATERIALS AND METHODS Seven hundred twenty disks with three different surface topographies-machined (MAC), titanium plasma-sprayed (TPS), and zirconia-blasted and acid-etched (ZRT)-were tested in this experiment. Bacterial adhesion tests were performed repeatedly on a simplified biofilm of Streptococcus mitis. Bacteria were incubated in the presence of the samples, which were subsequently either left untreated as controls or treated with APDBD for 30, 60, and 120 seconds. Samples were then metalized, prior to the recurring acquisition of images using a scanning electronic microscope (SEM). Protein adsorption, surface wettability, and early biologic response were determined for both treated (120 seconds) and untreated implant surfaces. For depicting the eukaryotic cell behavior, preosteoblastic murine cells were used. Cells were conveniently stained, and nuclei were counted. Cell viability was assessed by a chemiluminescent assay at 1, 2, and 3 days. RESULTS On all treated samples, values of the contact angle measurements were lower than 10 degrees. The untreated samples showed values of contact angle of 80, 100, and 110 degrees, respectively, for MAC, TPS, and ZRT. The protein adsorption on TPS and ZRT was significantly increased after the plasma of argon treatment. However, no significant effect was noted on the MAC disks. The number and the cell spreading area of adherent osteoblasts significantly increased in all treated surfaces. Nonetheless, argon treatment did not influence the osteoblast proliferation and viability at different time points. Bacteria adhesion was significantly reduced, even after 60 seconds of argon treatment. CONCLUSION Preliminary data showed that argon atmospheric pressure dielectric barrier discharge disinfected the implant surface, with potential to promote osteoblast attachment and spreading, suggesting this may be a possible approach to clean a peri-implantitis-contaminated implant surface.
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García MC, Mora M, Esquivel D, Foster JE, Rodero A, Jiménez-Sanchidrián C, Romero-Salguero FJ. Microwave atmospheric pressure plasma jets for wastewater treatment: Degradation of methylene blue as a model dye. Chemosphere 2017; 180:239-246. [PMID: 28411539 DOI: 10.1016/j.chemosphere.2017.03.126] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [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: 10/26/2016] [Revised: 02/05/2017] [Accepted: 03/21/2017] [Indexed: 06/07/2023]
Abstract
The degradation of methylene blue in aqueous solution as a model dye using a non thermal microwave (2.45 GHz) plasma jet at atmospheric pressure has been investigated. Argon has been used as feed gas and aqueous solutions with different concentrations of the dye were treated using the effluent from plasma jet in a remote exposure. The removal efficiency increased as the dye concentration decreased from 250 to 5 ppm. Methylene blue degrades after different treatment times, depending on the experimental plasma conditions. Thus, kinetic constants up to 0.177 min-1 were obtained. The higher the Ar flow, the faster the degradation rate. Optical emission spectroscopy (OES) was used to gather information about the species present in the gas phase, specifically excited argon atoms. Argon excited species and hydrogen peroxide play an important role in the degradation of the dye. In fact, the conversion of methylene blue was directly related to the density of argon excited species in the gas phase and the concentration of hydrogen peroxide in the aqueous liquid phase. Values of energy yield at 50% dye conversion of 0.296 g/kWh were achieved. Also, the use of two plasma applicators in parallel has been proven to improve energy efficiency.
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Affiliation(s)
- María C García
- Departamento de Física Aplicada, Universidad de Córdoba, Campus de Rabanales, Edificio Albert Einstein, E-14071 Córdoba, Spain.
| | - Manuel Mora
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, E-14071 Córdoba, Spain
| | - Dolores Esquivel
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, E-14071 Córdoba, Spain
| | - John E Foster
- Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Antonio Rodero
- Departamento de Física, Universidad de Córdoba, Campus de Rabanales, Edificio Albert Einstein, E-14071 Córdoba, Spain
| | - César Jiménez-Sanchidrián
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, E-14071 Córdoba, Spain
| | - Francisco J Romero-Salguero
- Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, E-14071 Córdoba, Spain.
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Zhou F, Liu S, Xing J, Liu Z, Song F. Fast analysis of benzodiazepines using argon direct analysis in real time mass spectrometry on-line coupled with a thermal-assisted gasification injector. Rapid Commun Mass Spectrom 2017; 31:1073-1076. [PMID: 28384380 DOI: 10.1002/rcm.7871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/31/2017] [Accepted: 03/31/2017] [Indexed: 06/07/2023]
Affiliation(s)
- Feng Zhou
- National Center of Mass Spectrometry in Changchun & Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Shu Liu
- National Center of Mass Spectrometry in Changchun & Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Junpeng Xing
- National Center of Mass Spectrometry in Changchun & Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Zhiqiang Liu
- National Center of Mass Spectrometry in Changchun & Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Fengrui Song
- National Center of Mass Spectrometry in Changchun & Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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Li J, Liu B, Zeng Y, Wang Z, Gao Z. Maximum availability and mineralogical control of chromium released from AOD slag. Environ Monit Assess 2017; 189:113. [PMID: 28210896 DOI: 10.1007/s10661-017-5843-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 08/31/2016] [Accepted: 02/09/2017] [Indexed: 06/06/2023]
Abstract
AOD (argon oxygen decarburization) slag is the by-product in the stainless steel refining process. Chromium existing in AOD slag can leach out and probably poses a serious threat to the environment. To assess the leaching toxicity of chromium released from AOD slag, the temperature-dependent maximum availability leaching test was performed. To determine the controlling mineralogical phases of chromium released from AOD slag, a Visual MINTEQ simulation was established based on Vminteq30 and the FactSage 7.0 database. The leaching tests indicated that the leaching availability of chromium was slight and mainly consisted of trivalent chromium. Aging of AOD slag under the atmosphere can oxidize trivalent chromium to hexavalent chromium, which could be leached out by rainwater. According to the simulation, the chromium concentration in leachates was controlled by the freely soluble pseudo-binary phases in the pH = 7.0 leaching process and controlled by the Cr2O3 phase in the pH = 4.0 leaching process. Chromium concentrations were underestimated when the controlling phases were determined to be FeCr2O4 and MgCr2O4. Facilitating the generation of the insoluble spinel-like phases during the cooling and disposal process of the molten slag could be an effective approach to decreasing the leaching concentration of chromium and its environmental risk.
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Affiliation(s)
- Junguo Li
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, People's Republic of China.
| | - Bao Liu
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, People's Republic of China
| | - Yanan Zeng
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, People's Republic of China
| | - Ziming Wang
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, People's Republic of China
| | - Zhiyuan Gao
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, People's Republic of China
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Li J, Liu B, Zeng Y, Wang Z. Mineralogical determination and geo-chemical modeling of chromium release from AOD slag: Distribution and leachability aspects. Chemosphere 2017; 167:360-366. [PMID: 27743532 DOI: 10.1016/j.chemosphere.2016.10.020] [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: 03/18/2016] [Revised: 09/28/2016] [Accepted: 10/07/2016] [Indexed: 06/06/2023]
Abstract
AOD (argon oxygen decarburization) slag, which is the by-product of the stainless steel refining process, is a recyclable slag because of its high content of calcium and silicon. The leaching toxicity cannot be ignored in the recycling process because the slag contains a certain amount of Cr. In this study, the mineral analysis, batch leaching tests and thermodynamic and kinetic modeling by PHREEQC combined with FactSage software were performed to explore the influence of the dissolution of primary minerals and the precipitation of secondary minerals on the elution of Cr from AOD slag. The results indicated that the main minerals in the original AOD slag are larnite, merwinite, pyroxene and periclase. Cr was dispersed in the mineral phases mentioned above. The simulation of Cr leaching controlled by Cr(III)-hydroxide corresponded better to the batch leaching tests, while the Cr leaching controlled by chromite or double control was underestimated. Increasing the L/S ratio enhances the pH of the leachate and restrains the elution of Cr from the AOD slag.
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Affiliation(s)
- Junguo Li
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, PR China.
| | - Bao Liu
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, PR China
| | - Yanan Zeng
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, PR China
| | - Ziming Wang
- College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, PR China
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Abstract
The problem presented involves the development of a new analytical model for the general fluid-solid temperature jump. To the best of our knowledge, there are no analytical models that provide the accurate predictions of the temperature jump for both gas and liquid systems. In this paper, a unified model for the fluid-solid temperature jump has been developed based on our adsorption model of the interfacial interactions. Results obtained from this model are validated with available results from the literature.
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Affiliation(s)
- Jian-Jun Shu
- School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
- * E-mail:
| | - Ji Bin Melvin Teo
- School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
| | - Weng Kong Chan
- School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
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35
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Sun Y, Liu Y, Li R, Xue G, Ognier S. Degradation of reactive blue 19 by needle-plate non-thermal plasma in different gas atmospheres: Kinetics and responsible active species study assisted by CFD calculations. Chemosphere 2016; 155:243-249. [PMID: 27124311 DOI: 10.1016/j.chemosphere.2016.04.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 12/26/2015] [Revised: 02/13/2016] [Accepted: 04/07/2016] [Indexed: 06/05/2023]
Abstract
This study investigated the degradation of a model organic compound, reactive blue (RB-19), in aqueous solution using a needle-plate non-thermal plasma (NTP) reactor, which was operated using three gas atmospheres (Ar, air, O2) at room temperature and atmospheric pressure. The relative discharge and degradation parameters, including the peak to peak applied voltage, power, ozone generation, pH, decolorization rates, energy density and the total organic carbon (TOC) reduction were analyzed to determine the various dye removal efficiencies. The decolorization rate for Ar, air and O2 were 59.9%, 49.6% and 89.8% respectively at the energy density of 100 kJ/L. The best TOC reduction was displayed by Ar with about 8.8% decrease, and 0% with O2 and air atmospheres. This phenomenon could be explained by the formation of OH• and O3 in the Ar and O2 atmospheres, which are responsible for increased mineralization and efficient decolorization. A one-dimension model was developed using software COMSOL to simulate the RB-19-ozone reaction and verify the experiments by comparing the simulated and experimental results. It was determined that ozone plays the most important role in the dye removal process, and the ozone contribution rate ranged from 0.67 to 0.82.
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Affiliation(s)
- Yu Sun
- School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China
| | - Yanan Liu
- School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
| | - Rui Li
- School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China
| | - Gang Xue
- School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China
| | - Stéphanie Ognier
- UPMC Univ Paris 06, EA 3492, Laboratoire de Génie des Procédés et Traitements de Surface, 11 rue Pierre et Marie Curie, 75005 Paris, France
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Abstract
Combined modality treatment of musculoskeletal tumors led to improved patient survival. As survival improves, more consideration is given to the functional outcome of treatment, and interest is focused on the development of less mutilating and extensive surgery. One modality that can reduce patient disability significantly is cryosurgery, as it allows minimally invasive surgery based on marginal resection and tumor interface sterilization instead of wide resection of certain neoplasms. Classical cryosurgery as developed by Marcove involves pouring of liquid nitrogen into the tumor bed. This approach revolutionized the treatment of some tumors such as giant cell tumor of bone, allowing intra-lesional resection to substitute the wide-resection method used up to that time. However, complications of this method of treatment are common, including nitrogen emboli, fractures of the bone due to extensive necrosis and damage to neurovascular elements. A recent development in the field of cryosurgery has been the argon-based system allowing controlled formation of an ice-ball surrounding a metallic probe. The system is computer controlled and allows precise evaluation of the tumor bed interface as well as surrounding structures that need to be protected. Prior to application of this method in humans it is important to ensure that interface sterilization is indeed achieved using cryosurgery. To evaluate this question, a Swarm rat chondrosarcoma was used. Cell viability was assessed following ice-ball formation. Histological evaluation indicated that cell death occurs up to 5 millimeters from the ice-ball if temperatures of −40° Celsius at the metallic probe are achieved. A further evaluation was performed on samples obtained from patients during surgery. A minimum of two freezing cycles was shown to be necessary to achieve tissue viability similar to that of boiled tissue. Twenty-seven patients were operated to date using an argon-based cryosurgery system. The patients included 7 cases of grade I chondrosarcoma, 5 cases of giant cell tumor of bone, 14 cases of a metastatic lytic bone lesion and a single case of osseous-fibrous dysplasia. None of the patients suffered nerve injury during the operation. After a minimal follow-up period of 2 years only two of the surviving patients had a recurrence (a giant cell tumor of the proximal fibula, and the patient with the osseous-fibrous dysplasia whose tumor recurred as a frankly malignant adamantimoma). There were no pathological fractures. This method appears practical and allows close monitoring of the surrounding tissue to reduce the chances of recurrence.
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Affiliation(s)
- Dror Robinson
- Department of Orthopedic Surgery, Campus Golda, Rabin Medical Center, KKL 7 Str., Petach Tikwa, Israel.
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Hirata R, Sampaio C, Machado LS, Coelho PG, Thompson VP, Duarte S, Ayres APA, Giannini M. Short- and Long-term Evaluation of Dentin-Resin Interfaces Formed by Etch-and-Rinse Adhesives on Plasma-treated Dentin. J Adhes Dent 2016; 18:215-22. [PMID: 27200431 DOI: 10.3290/j.jad.a36134] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE To investigate the influence of atmospheric pressure plasma (APP) treatment on the microtensile dentin bond strength of two etch-and-rinse adhesive systems, after one week and one year of water storage, and additionally to observe the micromorphology of resin/dentin interfaces under scanning electronic microscopy (SEM). MATERIALS AND METHODS The occlusal enamel was removed from third human molars to expose a flat dentin surface. The teeth were then randomly divided into six groups (n = 7), according to two adhesives (Optibond FL and XP-Bond) and three APP treatments (untreated dentin [control], APP application before or after acid etching). After performing the composite resin buildup on bonded dentin, the teeth were sectioned perpendicularly to the bonded interface to obtain beam-shaped specimens (cross-sectional area of ~0.9 mm2). The specimens were tested in tension until failure after one week and one year of water storage (1.0 mm/min rate). Bond strength data were analyzed by three-way ANOVA and Tukey's post-hoc test (α = 0.05%). Bonded beam specimens from each tooth were also prepared for interfacial SEM investigation. RESULTS At one week, APP treatment applied after acid etching increased the dentin bond strength for XP Bond, while no effect was observed for Optibond FL. After one year, the bond strength of XP Bond decreased in groups where APP was applied after etching. The evaluation time did not influence the bond strength for Optibond FL. CONCLUSION One-year evaluation did not show any sign of degradation of interfacial structures in any group. Application of APP to etched dentin combined with a two-step etch-and-rinse adhesive significantly increased bond strength at one week, but the effect was not stable after one year and was adhesive dependent.
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Russell BA, Khanal P, Calbi MM, Yudasaka M, Iijima S, Migone AD. Sorption Kinetics on Open Carbon Nanohorn Aggregates: The Effect of Molecular Diameter. Molecules 2016; 21:521. [PMID: 27110748 PMCID: PMC6274244 DOI: 10.3390/molecules21040521] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 04/10/2016] [Accepted: 04/15/2016] [Indexed: 11/16/2022] Open
Abstract
We present the results of a study of the kinetics of adsorption on aggregates of open carbon nanohorns using argon and CF₄ sorbates. We measured the equilibration times for each value of the sorbent loading along eight adsorption isotherms (four isotherms for each sorbate species). We found that: the equilibration times decrease as the sorbent loading (and the equilibrium pressure of the coexisting gas) increases, for a given temperature; and, that, for a given value of the sorbent loading, the equilibration times decrease with increasing temperature. When considering the effect of scaling of the temperatures by the respective critical temperatures we found that, at the same scaled temperature and at comparable loadings, the equilibration times for CF₄ were longer than those for argon. We discuss a possible explanation for this result.
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Affiliation(s)
- Brice A Russell
- Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA.
| | - Pravin Khanal
- Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA.
| | - Maria M Calbi
- Department of Physics & Astronomy, University of Denver, Denver, CO 80208-6900, USA.
| | - Masako Yudasaka
- National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan.
- Graduate School of Science and Technology, Meijo University, Shiogamaguchi, Tempaku, Nagoya 468-8502, Japan.
| | - Sumio Iijima
- Graduate School of Science and Technology, Meijo University, Shiogamaguchi, Tempaku, Nagoya 468-8502, Japan.
| | - Aldo D Migone
- Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA.
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Vijayaraghavan RK, Gaman C, Jose B, McCoy AP, Cafolla T, McNally PJ, Daniels S. Pulsed-Plasma Physical Vapor Deposition Approach Toward the Facile Synthesis of Multilayer and Monolayer Graphene for Anticoagulation Applications. ACS Appl Mater Interfaces 2016; 8:4878-4886. [PMID: 26808203 DOI: 10.1021/acsami.5b10952] [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] [Indexed: 06/05/2023]
Abstract
We demonstrate the growth of multilayer and single-layer graphene on copper foil using bipolar pulsed direct current (DC) magnetron sputtering of a graphite target in pure argon atmosphere. Single-layer graphene (SG) and few-layer graphene (FLG) films are deposited at temperatures ranging from 700 °C to 920 °C within <30 min. We find that the deposition and post-deposition annealing temperatures influence the layer thickness and quality of the graphene films formed. The films were characterized using atomic force microscopy (AFM), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and optical transmission spectroscopy techniques. Based on the above studies, a diffusion-controlled mechanism was proposed for the graphene growth. A single-step whole blood assay was used to investigate the anticoagulant activity of graphene surfaces. Platelet adhesion, activation, and morphological changes on the graphene/glass surfaces, compared to bare glass, were analyzed using fluorescence microscopy and SEM techniques. We have found significant suppression of the platelet adhesion, activation, and aggregation on the graphene-covered surfaces, compared to the bare glass, indicating the anticoagulant activity of the deposited graphene films. Our production technique represents an industrially relevant method for the growth of SG and FLG for various applications including the biomedical field.
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Affiliation(s)
- Rajani K Vijayaraghavan
- National Centre for Plasma Science and Technology, ‡School of Electronic Engineering, §Biomedical Diagnostics Institute, and ∥School of Physical Sciences, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Cezar Gaman
- National Centre for Plasma Science and Technology, ‡School of Electronic Engineering, §Biomedical Diagnostics Institute, and ∥School of Physical Sciences, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Bincy Jose
- National Centre for Plasma Science and Technology, ‡School of Electronic Engineering, §Biomedical Diagnostics Institute, and ∥School of Physical Sciences, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Anthony P McCoy
- National Centre for Plasma Science and Technology, ‡School of Electronic Engineering, §Biomedical Diagnostics Institute, and ∥School of Physical Sciences, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Tony Cafolla
- National Centre for Plasma Science and Technology, ‡School of Electronic Engineering, §Biomedical Diagnostics Institute, and ∥School of Physical Sciences, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Patrick J McNally
- National Centre for Plasma Science and Technology, ‡School of Electronic Engineering, §Biomedical Diagnostics Institute, and ∥School of Physical Sciences, Dublin City University , Glasnevin, Dublin 9, Ireland
| | - Stephen Daniels
- National Centre for Plasma Science and Technology, ‡School of Electronic Engineering, §Biomedical Diagnostics Institute, and ∥School of Physical Sciences, Dublin City University , Glasnevin, Dublin 9, Ireland
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40
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Thomae R, Conradie J, Fourie D, Mira J, Nemulodi F, Kuechler D, Toivanen V. Beam experiments with the Grenoble test electron cyclotron resonance ion source at iThemba LABS. Rev Sci Instrum 2016; 87:02A731. [PMID: 26931949 DOI: 10.1063/1.4935630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
At iThemba Laboratory for Accelerator Based Sciences (iThemba LABS) an electron cyclotron ion source was installed and commissioned. This source is a copy of the Grenoble Test Source (GTS) for the production of highly charged ions. The source is similar to the GTS-LHC at CERN and named GTS2. A collaboration between the Accelerators and Beam Physics Group of CERN and the Accelerator and Engineering Department of iThemba LABS was proposed in which the development of high intensity argon and xenon beams is envisaged. In this paper, we present beam experiments with the GTS2 at iThemba LABS, in which the results of continuous wave and afterglow operation of xenon ion beams with oxygen as supporting gases are presented.
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Affiliation(s)
- R Thomae
- iThemba LABS, P.O. Box 722, Somerset West 7130, South Africa
| | - J Conradie
- iThemba LABS, P.O. Box 722, Somerset West 7130, South Africa
| | - D Fourie
- iThemba LABS, P.O. Box 722, Somerset West 7130, South Africa
| | - J Mira
- iThemba LABS, P.O. Box 722, Somerset West 7130, South Africa
| | - F Nemulodi
- iThemba LABS, P.O. Box 722, Somerset West 7130, South Africa
| | - D Kuechler
- CERN, BE/ABP/HSL, 1211 Geneva 23, Switzerland
| | - V Toivanen
- CERN, BE/ABP/HSL, 1211 Geneva 23, Switzerland
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41
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Popa AC, Stan GE, Besleaga C, Ion L, Maraloiu VA, Tulyaganov DU, Ferreira JMF. Submicrometer Hollow Bioglass Cones Deposited by Radio Frequency Magnetron Sputtering: Formation Mechanism, Properties, and Prospective Biomedical Applications. ACS Appl Mater Interfaces 2016; 8:4357-4367. [PMID: 26836256 DOI: 10.1021/acsami.6b00606] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work reports on the unprecedented magnetron sputtering deposition of submicrometric hollow cones of bioactive glass at low temperature in the absence of any template or catalyst. The influence of sputtering conditions on the formation and development of bioglass cones was studied. It was shown that larger populations of well-developed cones could be achieved by increasing the argon sputtering pressure. A mechanism describing the growth of bioglass hollow cones is presented, offering the links for process control and reproducibility of the cone features. The composition, structure, and morphology of the as-synthesized hollow cones were investigated by energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), grazing incidence geometry X-ray diffraction (GIXRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM)-selected area electron diffraction (SAED). The in vitro biological performance, assessed by degradation tests (ISO 10993-14) and cytocompatibility assays (ISO 10993-5) in endothelial cell cultures, was excellent. This allied with resorbability and the unique morphological features make the submicrometer hollow cones interesting candidate material devices for focal transitory permeabilization of the blood-brain barrier in the treatment of carcinoma and neurodegenerative disorders.
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Affiliation(s)
- A C Popa
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
- Army Centre for Medical Research , 010195 Bucharest, Romania
| | - G E Stan
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
| | - C Besleaga
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
| | - L Ion
- University of Bucharest , Faculty of Physics, 077125 Magurele, Ilfov, Romania
| | - V A Maraloiu
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
| | - D U Tulyaganov
- Turin Polytechnic University in Tashkent , 100095 Tashkent, Uzbekistan
| | - J M F Ferreira
- Department of Materials and Ceramic Engineering, CICECO, University of Aveiro , 3810-193 Aveiro, Portugal
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Azkar Ul Hasan S, Jung Y, Kim S, Jung CL, Oh S, Kim J, Lim H. A Sensitivity Enhanced MWCNT/PDMS Tactile Sensor Using Micropillars and Low Energy Ar⁺ Ion Beam Treatment. Sensors (Basel) 2016; 16:s16010093. [PMID: 26771616 PMCID: PMC4732126 DOI: 10.3390/s16010093] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 12/28/2015] [Accepted: 01/04/2016] [Indexed: 02/07/2023]
Abstract
High sensitive flexible and wearable devices which can detect delicate touches have attracted considerable attentions from researchers for various promising applications. This research was aimed at enhancing the sensitivity of a MWCNT/PDMS piezoresistive tactile sensor through modification of its surface texture in the form of micropillars on MWCNT/PDMS film and subsequent low energy Ar+ ion beam treatment of the micropillars. The introduction of straight micropillars on the MWCNT/PDMS surface increased the sensitivity under gentle touch. Low energy ion beam treatment was performed to induce a stiff layer on the exposed surface of the micropillar structured MWCNT/PDMS film. The low energy ion bombardment stabilized the electrical properties of the MWCNT/PDMS surface and tuned the curvature of micropillars according to the treatment conditions. The straight micropillars which were treated by Ar+ ion with an incident angle of 0° demonstrated the enhanced sensitivity under normal pressure and the curved micropillars which were treated with Ar+ ion with an incident angle of 60° differentiated the direction of an applied shear pressure. The ion beam treatment on micropillar structured MWCNT/PDMS tactile sensors can thus be applied to reliable sensing under gentle touch with directional discrimination.
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Affiliation(s)
- Syed Azkar Ul Hasan
- Department of Nature-Inspired Nano Convergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea.
- Department of Nanobiotechnology, University of Science & Technology, Daejeon 34113, Korea.
| | - Youngdo Jung
- Department of Nature-Inspired Nano Convergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea.
| | - Seonggi Kim
- Department of Nature-Inspired Nano Convergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea.
| | - Cho-Long Jung
- Department of Nature-Inspired Nano Convergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea.
| | - Sunjong Oh
- Department of Nature-Inspired Nano Convergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea.
| | - Junhee Kim
- Department of Nature-Inspired Nano Convergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea.
| | - Hyuneui Lim
- Department of Nature-Inspired Nano Convergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea.
- Department of Nanobiotechnology, University of Science & Technology, Daejeon 34113, Korea.
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Nomade S, Genty D, Sasco R, Scao V, Féruglio V, Baffier D, Guillou H, Bourdier C, Valladas H, Reigner E, Debard E, Pastre J, Geneste JM. A 36,000-Year-Old Volcanic Eruption Depicted in the Chauvet-Pont d'Arc Cave (Ardèche, France)? PLoS One 2016; 11:e0146621. [PMID: 26745626 PMCID: PMC4706433 DOI: 10.1371/journal.pone.0146621] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 12/18/2015] [Indexed: 11/19/2022] Open
Abstract
Among the paintings and engravings found in the Chauvet-Pont d’Arc cave (Ardèche, France), several peculiar spray-shape signs have been previously described in the Megaloceros Gallery. Here we document the occurrence of strombolian volcanic activity located 35 km northwest of the cave, and visible from the hills above the cave entrance. The volcanic eruptions were dated, using 40Ar/39Ar, between 29 ± 10 ka and 35 ± 8 ka (2σ), which overlaps with the 14C AMS and thermoluminescence ages of the first Aurignacian occupations of the cave in the Megaloceros Gallery. Our work provides the first evidence of an intense volcanic activity between 40 and 30 ka in the Bas-Vivarais region, and it is very likely that Humans living in the Ardèche river area witnessed one or several eruptions. We propose that the spray-shape signs found in the Chauvet-Pont d’Arc cave could be the oldest known depiction of a volcanic eruption, predating by more than 34 ka the description by Pliny the Younger of the Vesuvius eruption (AD 79) and by 28 ka the Çatalhöyük mural discovered in central Turkey.
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Affiliation(s)
- Sébastien Nomade
- Laboratoire des Sciences du Climat et de L’Environnement, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
- * E-mail:
| | - Dominique Genty
- Laboratoire des Sciences du Climat et de L’Environnement, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Romain Sasco
- Laboratoire des Sciences du Climat et de L’Environnement, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Vincent Scao
- Laboratoire des Sciences du Climat et de L’Environnement, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Valérie Féruglio
- Laboratoire PACEA, UMR 5199, CNRS, Université de Bordeaux, Pessac, France
| | - Dominique Baffier
- Laboratoire ArScAn, UMR 7041, Université Paris-Ouest Nanterre, Nanterre, France
| | - Hervé Guillou
- Laboratoire des Sciences du Climat et de L’Environnement, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Camille Bourdier
- Laboratoire TRACES, UMR 5608 Université Toulouse-Jean Jaurès, Toulouse, France
| | - Hélène Valladas
- Laboratoire des Sciences du Climat et de L’Environnement, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Edouard Reigner
- Laboratoire des Sciences du Climat et de L’Environnement, UMR8212, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Evelyne Debard
- Laboratoire de Géologie de Lyon, UMR 5276 CNRS, Université Lyon1, Villeurbanne, France
| | - Jean–François Pastre
- Laboratoire de Géographie Physique. UMR 8591 CNRS Universités de Paris I et XII, Meudon, France
| | - Jean-Michel Geneste
- Laboratoire PACEA, UMR 5199, CNRS, Université de Bordeaux, Pessac, France
- Centre National de la Préhistoire, Ministère de la Culture et de la Communication, Périgueux, France
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Gruener S, Wallacher D, Greulich S, Busch M, Huber P. Hydraulic transport across hydrophilic and hydrophobic nanopores: Flow experiments with water and n-hexane. Phys Rev E 2016; 93:013102. [PMID: 26871150 DOI: 10.1103/physreve.93.013102] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Indexed: 06/05/2023]
Abstract
We experimentally explore pressure-driven flow of water and n-hexane across nanoporous silica (Vycor glass monoliths with 7- or 10-nm pore diameters, respectively) as a function of temperature and surface functionalization (native and silanized glass surfaces). Hydraulic flow rates are measured by applying hydrostatic pressures via inert gases (argon and helium, pressurized up to 70 bar) on the upstream side in a capacitor-based membrane permeability setup. For the native, hydrophilic silica walls, the measured hydraulic permeabilities can be quantitatively accounted for by bulk fluidity provided we assume a sticking boundary layer, i.e., a negative velocity slip length of molecular dimensions. The thickness of this boundary layer is discussed with regard to previous capillarity-driven flow experiments (spontaneous imbibition) and with regard to velocity slippage at the pore walls resulting from dissolved gas. Water flow across the silanized, hydrophobic nanopores is blocked up to a hydrostatic pressure of at least 70 bar. The absence of a sticking boundary layer quantitatively accounts for an enhanced n-hexane permeability in the hydrophobic compared to the hydrophilic nanopores.
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Affiliation(s)
- Simon Gruener
- Experimental Physics, Saarland University, D-66041 Saarbrücken, Germany and Sorption and Permeation Laboratory, BASF SE, D-67056 Ludwigshafen, Germany
| | - Dirk Wallacher
- Experimental Physics, Saarland University, D-66041 Saarbrücken, Germany and Department Sample Environments, Helmholtz-Centre Berlin for Energy and Materials, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany
| | - Stefanie Greulich
- Experimental Physics, Saarland University, D-66041 Saarbrücken, Germany
| | - Mark Busch
- Institute of Materials Physics and Technology, Eißendorfer Str. 42, D-21073 Hamburg-Harburg, Germany
| | - Patrick Huber
- Experimental Physics, Saarland University, D-66041 Saarbrücken, Germany and Institute of Materials Physics and Technology, Eißendorfer Str. 42, D-21073 Hamburg-Harburg, Germany
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Zuo M, Renman G, Gustafsson JP, Renman A. Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment. Water Res 2015; 87:271-281. [PMID: 26433005 DOI: 10.1016/j.watres.2015.09.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 05/25/2015] [Revised: 09/16/2015] [Accepted: 09/20/2015] [Indexed: 06/05/2023]
Abstract
Argon oxygen decarburisation (AOD) slag may be used for phosphorus (P) removal, as its high pH and weatherable calcium (Ca) minerals provide sufficient Ca(2+) and OH(-) for calcium phosphate (Ca-PO4) precipitation. This study examined the P removal performance of AOD slag for use as wastewater treatment material. Batch experiments were carried out using both synthetic P solution and real wastewater, followed by chemical modelling and X-ray absorption near edge structure (XANES) spectroscopy. The influences of initial P concentration, slag dose and modification by polyethylene glycol (PEG), an effective agent for generation of porous materials, were investigated to determine the optimal conditions for P removal by AOD slag. It was found that virgin AOD slag removed 94.8% of P from a synthetic P solution in 4 h and 97.8% in 10 h. This high P removal was accompanied by a rapid increase in pH from 7.0 to 10.74. The maximum P removal capacity (PRC) from synthetic P solution ranged from 1.3 to 27.5 mg P g(-1). The optimal AOD dose for P removal from wastewater, determined in 8-h batch experiments, was 25 g L(-1). PEG modification increased the reaction rate and resulted in higher final pH, increasing PRC by 47.9%. Combined Visual MINTEQ and XANES analysis for detailed examination of P removal mechanisms revealed that the main P removal mechanism was precipitation of calcium phosphate. According to the XANES analysis, the main Ca-PO4 precipitate formed on virgin AOD slag under low initial P concentration and high pH was apatite, while brushite was the dominant product at high initial P concentration and low pH.
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Affiliation(s)
- Minyu Zuo
- Division of Land and Water Resources Engineering, KTH Royal Institute of Technology, Teknikringen 76, SE-100 44 Stockholm, Sweden.
| | - Gunno Renman
- Division of Land and Water Resources Engineering, KTH Royal Institute of Technology, Teknikringen 76, SE-100 44 Stockholm, Sweden.
| | - Jon Petter Gustafsson
- Division of Land and Water Resources Engineering, KTH Royal Institute of Technology, Teknikringen 76, SE-100 44 Stockholm, Sweden; Department of Soil and Environment, Swedish University of Agricultural Sciences, Box 7014, SE-750 07 Uppsala, Sweden.
| | - Agnieszka Renman
- Division of Land and Water Resources Engineering, KTH Royal Institute of Technology, Teknikringen 76, SE-100 44 Stockholm, Sweden.
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Hirata R, Teixeira H, Ayres APA, Machado LS, Coelho PG, Thompson VP, Giannini M. Long-term Adhesion Study of Self-etching Systems to Plasma-treated Dentin. J Adhes Dent 2015; 17:227-33. [PMID: 26159128 DOI: 10.3290/j.jad.a34138] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE To determine the influence of atmospheric pressure plasma (APP) treatment on the microtensile dentin bond strength of two self-etching adhesive systems after one year of water storage as well as observe the contact angle changes of dentin treated with plasma and the micromorphology of resin/dentin interfaces using SEM. MATERIALS AND METHODS For contact angle measurements, 6 human molars were sectioned to remove the occlusal enamel surface, embedded in PMMA resin, and ground to expose a flat dentin surface. Teeth were divided into two groups: 1) argon APP treatment for 30 s, and 2) blown air (control). For the microtensile test, 28 human third molars were used and prepared similarly to contact angle measurements. Teeth were randomly divided into 4 groups (n = 7) according to two self-etching adhesives and APP treatment (with/without). After making the composite resin buildup, teeth were sectioned perpendicular to the bonded interface to obtain beam specimens. The specimens were tested after 24 h and one year of water storage until failure. Bond strength data were analyzed by three-way ANOVA and Tukey's post-hoc test (α = 0.05%). Three beam specimens per group that were not used in the bond strength test were prepared for interfacial SEM analysis. RESULTS APP application decreased the contact angle, but increased the bond strength only for one adhesive tested. SEM evaluation found signs of degradation within interfacial structures following 1-year aging in water. APP increased the dentin surface energy, but the effects of APP and 1-year water storage on dentin bond strength were product dependent. CONCLUSION APP increased the dentin surface energy. It also increased the bond strength for Scotchbond Universal, but storage for one year negated the positive effect of APP treatment.
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dos Santos DM, Vechiato-Filho AJ, da Silva EVF, Goiato MC, Cesar PF, Rangel EC, da Cruz NC. Aging Effect of Atmospheric Air on Zirconia Surfaces Treated by Nonthermal Plasma. J Adhes Dent 2015; 17:413-9. [PMID: 26525005 DOI: 10.3290/j.jad.a35011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE The purpose of this study was twofold: 1) to characterize the zirconia (Y-TZP) surfaces through scanning electronic microscopy associated with energy-dispersive spectroscopy and atomic force microscopy after the deposition of a thin organosilicon film by nonthermal plasma (NTP) treatment, and 2) to determine the zirconia surface hydrophilicity, before and after aging, through surface energy analysis. MATERIALS AND METHODS Surfaces of 16 zirconia disks (10 x 3 mm) were treated for 30 min each with hexamethyldisiloxane and argon plasmas, followed by oxygen plasma. Disks were analyzed before NTP treatment, immediately after NTP treatment, and after aging for 7, 15, and 30 days. The surface energy of the Y-TZP disks was measured with a goniometer. Quantitative data were submitted to statistical analysis using ANOVA and Tukey's test (p < 0.05). RESULTS Immediately after NTP treatment, the surface energy of the zirconia disks was significantly higher than at any other tested period (p < 0.001), and the water contact angle on the zirconia disks was reduced to 0 degrees. Similar surface energy results were obtained before NTP treatment and after 15 or 30 days of aging (p > 0.05; Tukey's test). Energy-dispersive spectroscopy results revealed the presence of carbon, oxygen, and silicon on the surface after NTP treatment. CONCLUSION NTP treatment was useful for treating the zirconia surface for cementation procedures, as it produced a high level of hydrophilicity on the zirconia surface. However, this high level of hydrophilicity did not persist after aging.
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Šantak V, Zaplotnik R, Tarle Z, Milošević S. Optical Emission Spectroscopy of an Atmospheric Pressure Plasma Jet During Tooth Bleaching Gel Treatment. Appl Spectrosc 2015; 69:1327-1333. [PMID: 26647056 DOI: 10.1366/15-07962] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Optical emission spectroscopy was performed during atmospheric pressure plasma needle helium jet treatment of various tooth-bleaching gels. When the gel sample was inserted under the plasma plume, the intensity of all the spectral features increased approximately two times near the plasma needle tip and up to two orders of magnitude near the sample surface. The color change of the hydroxylapatite pastille treated with bleaching gels in conjunction with the atmospheric pressure plasma jet was found to be in correlation with the intensity of OH emission band (309 nm). Using argon as an additive to helium flow (2 L/min), a linear increase (up to four times) of OH intensity and, consequently, whitening (up to 10%) of the pastilles was achieved. An atmospheric pressure plasma jet activates bleaching gel, accelerates OH production, and accelerates tooth bleaching (up to six times faster).
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Affiliation(s)
- Vedran Šantak
- Institute of Physics, Bijenička cesta 46, 10000 Zagreb, Croatia
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Chandran J, Aravind UK, Aravindakumar CT. Sonochemical transformation of thymidine: A mass spectrometric study. Ultrason Sonochem 2015; 27:178-186. [PMID: 26186835 DOI: 10.1016/j.ultsonch.2015.05.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 02/09/2015] [Revised: 05/14/2015] [Accepted: 05/15/2015] [Indexed: 06/04/2023]
Abstract
Ultrasound is extensively used in medical field for a number of applications including targeted killing of cancer cells. DNA is one of the most susceptible entities in any kind of free radical induced reactions in living systems. In the present work, the transformation of thymidine (dT) induced by ultrasound (US) was investigated using high resolution mass spectrometry (LC-Q-ToF-MS). dT was subjected to sonolysis under four different frequencies (200, 350, 620 and 1000 kHz) and at three power densities (10.5, 24.5 and 42 W/mL) in aerated as well as argon saturated conditions. A total of twenty modified nucleosides including non-fully characterized dT dimeric compounds were detected by LC-Q-ToF-MS. Out of these products, seven were obtained only in the argon atmosphere and two only in the aerated conditions. Among the identified products, there were base modified products and sugar modified products. The products were formed by the reaction of hydroxyl radical and hydrogen atom. Under aerated conditions, the reactions proceed via the formation of hydroperoxides, while in argon atmosphere disproportionation and radical recombinations predominate. The study provides a complete picture of sonochemical transformation pathways of dT which has relevance in DNA damage under ultrasound exposure.
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Affiliation(s)
- Jisha Chandran
- Inter University Instrumentation Centre, Mahatma Gandhi University, Kottayam 686560, Kerala, India
| | - Usha K Aravind
- Advanced Centre of Environmental Science and Sustainable Development, Mahatma Gandhi University, Kottayam 686560, Kerala, India
| | - C T Aravindakumar
- Inter University Instrumentation Centre, Mahatma Gandhi University, Kottayam 686560, Kerala, India; School of Environmental Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India.
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Razo IB, Sheraz SNR, Henderson A, Lockyer NP, Vickerman JC. Mass spectrometric imaging of brain tissue by time-of-flight secondary ion mass spectrometry--How do polyatomic primary beams C₆₀⁺, Ar₂₀₀₀⁺, water-doped Ar₂₀₀₀⁺ and (H₂O)₆₀₀₀⁺ compare? Rapid Commun Mass Spectrom 2015; 29:1851-62. [PMID: 26411506 PMCID: PMC4989468 DOI: 10.1002/rcm.7285] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Revised: 07/14/2015] [Accepted: 07/15/2015] [Indexed: 05/11/2023]
Abstract
RATIONALE To discover the degree to which water-containing cluster beams increase secondary ion yield and reduce the matrix effect in time-of-flight secondary ion mass spectrometry (TOF-SIMS) imaging of biological tissue. METHODS The positive SIMS ion yields from model compounds, mouse brain lipid extract and mouse brain tissue together with mouse brain images were compared using 20 keV C60(+), Ar2000(+), water-doped Ar2000(+) and pure (H2O)6000(+) primary beams. RESULTS Water-containing cluster beams where the beam energy per nucleon (E/nucleon) ≈ 0.2 eV are optimum for enhancing ion yields dependent on protonation. Ion yield enhancements over those observed using Ar2000(+) lie in the range 10 to >100 using the (H2 O)6000 (+) beam, while with water-doped (H2O)Ar2000(+) they lie in the 4 to 10 range. The two water-containing beams appear to be optimum for tissue imaging and show strong evidence of increasing yields from molecules that experience matrix suppression under other primary beams. CONCLUSIONS The application of water-containing primary beams is suggested for biological SIMS imaging applications, particularly if the beam energy can be raised to 40 keV or higher to further increase ion yield and enhance spatial resolution to ≤1 µm.
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Affiliation(s)
- Irma Berrueta Razo
- Manchester Institute of Biotechnology, The University of Manchester, Manchester, M13 9PL, UK
- School of Chemistry, The University of Manchester, Manchester, UK
| | - Sadia née Rabbani Sheraz
- Manchester Institute of Biotechnology, The University of Manchester, Manchester, M13 9PL, UK
- School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, UK
| | - Alex Henderson
- Manchester Institute of Biotechnology, The University of Manchester, Manchester, M13 9PL, UK
- School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, UK
| | - Nicholas P Lockyer
- Manchester Institute of Biotechnology, The University of Manchester, Manchester, M13 9PL, UK
- School of Chemistry, The University of Manchester, Manchester, UK
| | - John C Vickerman
- Manchester Institute of Biotechnology, The University of Manchester, Manchester, M13 9PL, UK
- School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, UK
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