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Craciun C, Stoica SD, Mitu BM, Acsente T, Dinescu G. Mass Spectra Fitting as Diagnostic Tool for Magnetron Plasmas Generated in Ar and Ar/H 2 Gases with Tungsten Targets. Molecules 2023; 28:5664. [PMID: 37570638 PMCID: PMC10420293 DOI: 10.3390/molecules28155664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/20/2023] [Accepted: 07/24/2023] [Indexed: 08/13/2023] Open
Abstract
In this work, we describe an ion mass spectra processing method from plasmas generated in Ar and Ar/H2 gases in contact with tungsten surfaces. For this purpose, advanced model functions, i.e., those suitable for fitting the experimental mass peak profiles, are used. In addition, the peak positions, peak shapes, abundances, and ion ratios are the parameters considered for building these functions. In the case of a multielement magnetron target, the calibration of the mass spectra with respect to the peak shape and position on the m/z scale is helpful in reducing the number of free variables during fitting. The mass spectra fitting procedure is validated by the obtained isotopic abundances of W ions in W/Ar magnetron plasmas, which, in turn, are comparable with their natural abundance. Moreover, its usefulness is exemplified by calculating the ratio of WH+/W+ ions in W/Ar/H2 plasma. This work paves the way for obtaining relevant results regarding ion species in plasma even in the case of using general-purpose mass spectrometers with limited resolution and accuracy. Although this method is illustrated for the W/Ar/H2 plasma system, it can be easily extendable to any plasma type.
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Affiliation(s)
- Cristina Craciun
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., 077125 Magurele, Ilfov, Romania; (C.C.); (S.D.S.); (T.A.)
- Doctoral School of Physics, Faculty of Physics, University of Bucharest, 405 Atomistilor Str., 077125 Magurele, Ilfov, Romania
| | - Silviu Daniel Stoica
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., 077125 Magurele, Ilfov, Romania; (C.C.); (S.D.S.); (T.A.)
| | - Bogdana Maria Mitu
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., 077125 Magurele, Ilfov, Romania; (C.C.); (S.D.S.); (T.A.)
| | - Tomy Acsente
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., 077125 Magurele, Ilfov, Romania; (C.C.); (S.D.S.); (T.A.)
| | - Gheorghe Dinescu
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., 077125 Magurele, Ilfov, Romania; (C.C.); (S.D.S.); (T.A.)
- Doctoral School of Physics, Faculty of Physics, University of Bucharest, 405 Atomistilor Str., 077125 Magurele, Ilfov, Romania
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Yehia SA, Gabriela Carpen L, Stokker-Cheregi F, Poroşnicu C, Sătulu V, Staicu C, Butoi B, Lungu I, Virot F, Grisolia C, Dinescu G. Corrigendum to ’Laser ablation of a solid target in liquid medium for beryllium nanoparticles synthesis’ Nuclear Materials and Energy 31 (2022) 101160. Nuclear Materials and Energy 2023. [DOI: 10.1016/j.nme.2023.101411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
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Carpen LG, Acasandrei MA, Acsente T, Matei E, Lungu I, Dinescu G. In vitro analysis of the cytotoxic effect of two different sizes ITER-like tungsten nanoparticles on human dermal fibroblasts. Heliyon 2023; 9:e13849. [PMID: 36895402 PMCID: PMC9988585 DOI: 10.1016/j.heliyon.2023.e13849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 02/06/2023] [Accepted: 02/14/2023] [Indexed: 02/19/2023] Open
Abstract
Background Based on the current configuration of the International Thermonuclear Experimental Reactor, tungsten (W) was chosen as the armour material. Nevertheless, during operation, the expected power and temperature of plasma can trigger the formation of W dust in the plasma chamber. According to the scenario for a Loss Of Vacuum Accident (LOVA), in the case of confinement failure dust is released, which can lead to occupational or accidental exposure. Methods For a first evidence of potential risks, fusion devices relevant W dust has been produced on purpose, using a magnetron sputtering gas aggregation source. We aimed to assess the in vitro cytotoxicity of synthesized tungsten nanoparticles (W-NPs) with diameters of 30 and 100 nm, on human BJ fibroblasts. That was systematically investigated using different cytotoxic endpoints (metabolic activity, cellular ATP, AK release and caspase-3/7 activity) and by direct observation with optical and scanning electron microscopy. Results Increasing concentrations of W-NPs of both sizes induced cell viability decrease, but the effect was significantly higher for large W-NPs, starting from 200 μg/mL. In direct correlation with the effect on the cell membrane integrity, high concentrations of large W-NPs appear to increase AK release in the first 24 h of treatment. On the other hand, activation of the cellular caspase 3/7 was found significantly increased after 16 h of treatment solely for low concentrations of small W-NPs. SEM images revealed an increased tendency of agglomeration of small W-NPs in liquid medium, but no major differences in cells development and morphology were observed after treatment. An apparent internalization of nanoparticles under the cell membrane was also identified. Conclusion These results provide evidence for different toxicological outputs identified as mechanistic responses of BJ fibroblasts to different sizes of W-NPs, indicating also that small W-NPs (30 nm) display lower cytotoxicity compared to larger ones (100 nm).
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Affiliation(s)
- Lavinia Gabriela Carpen
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125, Magurele, Ilfov, Romania.,Faculty of Physics, University of Bucharest, 405 Atomistilor Street, 077125, Magurele, Ilfov, Romania
| | - Maria Adriana Acasandrei
- Horia Hulubei National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, 077125, Magurele, Ilfov, Romania
| | - Tomy Acsente
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125, Magurele, Ilfov, Romania
| | - Elena Matei
- National Institute of Materials Physics, 405A Atomistilor Street, 077125, Magurele, Ilfov, Romania
| | - Iulia Lungu
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125, Magurele, Ilfov, Romania
| | - Gheorghe Dinescu
- National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125, Magurele, Ilfov, Romania.,Faculty of Physics, University of Bucharest, 405 Atomistilor Street, 077125, Magurele, Ilfov, Romania
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Balan AE, Bita BI, Vizireanu S, Dinescu G, Stamatin I, Trefilov AMI. Carbon-Nanowall Microporous Layers for Proton Exchange Membrane Fuel Cell. Membranes (Basel) 2022; 12:1064. [PMID: 36363619 PMCID: PMC9698599 DOI: 10.3390/membranes12111064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/24/2022] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
The cathode microporous layer (MPL), as one of the key components of the proton exchange membrane fuel cell (PEM-FC), requires specialized carbon materials to ensure the two-phase flow and interfacial effects. In this respect, we designed a novel MPL based on highly hydrophobic carbon nanowalls (CNW). Employing plasma-assisted chemical vapor deposition techniques directly on carbon paper, we produced high-quality microporous layers at a competitive yield-to-cost ratio with distinctive MPL properties: high porosity, good stability, considerable durability, high hydrophobicity, and substantial conductivity. The specific morphological and structural properties were determined by scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Thermo-gravimetric analysis was employed to study the nanostructures' thermal stability and contact angle measurements were performed on the CNW substrate to study the hydrophobic character. Platinum ink, serving as a fuel cell catalyst, was sprayed directly onto the MPLs and incorporated in the FC assembly by hot-pressing against a polymeric membrane to form the membrane-electrode assembly and gas diffusion layers. Single-fuel-cell testing, at moderate temperature and humidity, revealed improved power performance comparable to industrial quality membrane assemblies (500 mW cm-2 mg-1 of cathodic Pt load at 80 °C and 80% RH), with elevated working potential (0.99 V) and impeccable fuel crossover for a low-cost system.
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Affiliation(s)
- Adriana Elena Balan
- Faculty of Physics, University of Bucharest, 077125 Bucharest-Măgurele, Romania
| | - Bogdan Ionut Bita
- Faculty of Physics, University of Bucharest, 077125 Bucharest-Măgurele, Romania
- National R&D Institute for Laser, Plasma and Radiation Physics (INFLPR), 077125 Bucharest-Măgurele, Romania
| | - Sorin Vizireanu
- National R&D Institute for Laser, Plasma and Radiation Physics (INFLPR), 077125 Bucharest-Măgurele, Romania
| | - Gheorghe Dinescu
- National R&D Institute for Laser, Plasma and Radiation Physics (INFLPR), 077125 Bucharest-Măgurele, Romania
| | - Ioan Stamatin
- Faculty of Physics, University of Bucharest, 077125 Bucharest-Măgurele, Romania
| | - Alexandra Maria Isabel Trefilov
- Faculty of Physics, University of Bucharest, 077125 Bucharest-Măgurele, Romania
- National R&D Institute for Laser, Plasma and Radiation Physics (INFLPR), 077125 Bucharest-Măgurele, Romania
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Kravets LI, Altynov VA, Yarmolenko MA, Gainutdinov RV, Satulu V, Mitu B, Dinescu G. Deposition of Hydrophobic Polymer Coatings on the Surface of Track-Etched Membranes from an Active Gas Phase. Membr Membr Technol 2022. [DOI: 10.1134/s251775162202007x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yehia SA, Gabriela Carpen L, Stokker-Cheregi F, Porosnicu C, Satulu V, Staicu C, Butoi B, Lungu I, Virot F, Grisolia C, Dinescu G. Laser ablation of a solid target in liquid medium for beryllium nanoparticles synthesis. Nuclear Materials and Energy 2022. [DOI: 10.1016/j.nme.2022.101160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Zarif ME, Yehia SA, Biță B, Sătulu V, Vizireanu S, Dinescu G, Holban AM, Marinescu F, Andronescu E, Grumezescu AM, Bîrcă AC, Farcașiu AT. Atmospheric Pressure Plasma Activation of Hydroxyapatite to Improve Fluoride Incorporation and Modulate Bacterial Biofilm. Int J Mol Sci 2021; 22:13103. [PMID: 34884908 PMCID: PMC8658314 DOI: 10.3390/ijms222313103] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 11/04/2021] [Revised: 11/28/2021] [Accepted: 11/30/2021] [Indexed: 11/27/2022] Open
Abstract
Despite the technological progress of the last decade, dental caries is still the most frequent oral health threat in children and adults alike. Such a condition has multiple triggers and is caused mainly by enamel degradation under the acidic attack of microbial cells, which compose the biofilm of the dental plaque. The biofilm of the dental plaque is a multispecific microbial consortium that periodically develops on mammalian teeth. It can be partially removed through mechanical forces by individual brushing or in specialized oral care facilities. Inhibition of microbial attachment and biofilm formation, as well as methods to strengthen dental enamel to microbial attack, represent the key factors in caries prevention. The purpose of this study was to elaborate a cold plasma-based method in order to modulate microbial attachment and biofilm formation and to improve the retention of fluoride (F-) in an enamel-like hydroxyapatite (HAP) model sample. Our results showed improved F retention in the HAP model, which correlated with an increased antimicrobial and antibiofilm effect. The obtained cold plasma with a dual effect exhibited through biofilm modulation and enamel strengthening through fluoridation is intended for dental application, such as preventing and treating dental caries and enamel deterioration.
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Affiliation(s)
- Maria Elena Zarif
- Low Temperature Plasma Laboratory, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 011061 Bucharest, Romania
| | - Sașa Alexandra Yehia
- Low Temperature Plasma Laboratory, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania
- Faculty of Physics, University of Bucharest, 077125 Măgurele, Romania
| | - Bogdan Biță
- Low Temperature Plasma Laboratory, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania
- Faculty of Physics, University of Bucharest, 077125 Măgurele, Romania
| | - Veronica Sătulu
- Low Temperature Plasma Laboratory, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania
| | - Sorin Vizireanu
- Low Temperature Plasma Laboratory, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania
| | - Gheorghe Dinescu
- Low Temperature Plasma Laboratory, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania
- Faculty of Physics, University of Bucharest, 077125 Măgurele, Romania
| | - Alina Maria Holban
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Florica Marinescu
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 77206 Bucharest, Romania
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
| | - Ecaterina Andronescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov no. 3, 050045 Bucharest, Romania
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 011061 Bucharest, Romania
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 050657 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov no. 3, 050045 Bucharest, Romania
| | - Alexandra Cătălina Bîrcă
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 011061 Bucharest, Romania
| | - Alexandru Titus Farcașiu
- Department of Removable Prosthodontics, Faculty of Dental Medicine, Carol Davila University of Medicine and Pharmacy, 032799 Bucharest, Romania
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Panaitescu DM, Vizireanu S, Stoian SA, Nicolae CA, Gabor AR, Damian CM, Trusca R, Carpen LG, Dinescu G. Poly(3-hydroxybutyrate) Modified by Plasma and TEMPO-Oxidized Celluloses. Polymers (Basel) 2020; 12:polym12071510. [PMID: 32646005 PMCID: PMC7408025 DOI: 10.3390/polym12071510] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/04/2020] [Accepted: 07/06/2020] [Indexed: 01/16/2023] Open
Abstract
Microcrystalline cellulose (MCC) was surface modified by two approaches, namely a plasma treatment in liquid using a Y-shaped tube for oxygen flow (MCC-P) and a TEMPO mediated oxidation (MCC-T). Both treatments led to the surface functionalization of cellulose as illustrated by FTIR and XPS results. However, TEMPO oxidation had a much stronger oxidizing effect, leading to a decrease of the thermal stability of MCC by 80 °C. Plasma and TEMPO modified celluloses were incorporated in a poly(3-hydroxybutyrate) (PHB) matrix and they influenced the morphology, thermal, and mechanical properties of the composites (PHB-MCC-P and PHB-MCC-T) differently. However, both treatments were efficient in improving the fiber-polymer interface and the mechanical properties, with an increase of the storage modulus of composites by 184% for PHB-MCC-P and 167% for PHB-MCC-T at room temperature. The highest increase of the mechanical properties was observed in the composite containing plasma modified cellulose although TEMPO oxidation induced a much stronger surface modification of cellulose. This was due to the adverse effect of more advanced degradation in this last case. The results showed that Y-shaped plasma jet oxidation of cellulose water suspensions is a simple and cheap treatment and a promising method of cellulose functionalization for PHB and other biopolymer reinforcements.
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Affiliation(s)
- Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
- Correspondence: (D.M.P.); (S.V.)
| | - Sorin Vizireanu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania; (L.G.C.); (G.D.)
- Correspondence: (D.M.P.); (S.V.)
| | - Sergiu Alexandru Stoian
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
- Advanced Polymers Materials Group, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania;
| | - Cristian-Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
| | - Augusta Raluca Gabor
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania; (S.A.S.); (C.-A.N.); (A.R.G.)
| | - Celina Maria Damian
- Advanced Polymers Materials Group, University Politehnica of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania;
| | - Roxana Trusca
- Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania;
| | - Lavinia Gabriela Carpen
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania; (L.G.C.); (G.D.)
- Faculty of Physics, Bucharest University, 405 Atomistilor Street, Magurele-Bucharest, 077125 Ilfov, Romania
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania; (L.G.C.); (G.D.)
- Faculty of Physics, Bucharest University, 405 Atomistilor Street, Magurele-Bucharest, 077125 Ilfov, Romania
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Ribeiro AI, Modic M, Cvelbar U, Dinescu G, Mitu B, Nikiforov A, Leys C, Kuchakova I, De Vrieze M, Felgueiras HP, Souto AP, Zille A. Effect of Dispersion Solvent on the Deposition of PVP-Silver Nanoparticles onto DBD PlasmaTreated Polyamide 6,6 Fabric and Its Antimicrobial Efficiency. Nanomaterials (Basel) 2020; 10:nano10040607. [PMID: 32224934 PMCID: PMC7221693 DOI: 10.3390/nano10040607] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/16/2020] [Accepted: 03/21/2020] [Indexed: 01/02/2023]
Abstract
Polyvinylpyrrolidone-coated silver nanoparticles (PVP-AgNPs) dispersed in ethanol, water and water/alginate were used to functionalize untreated and dielectric barrier discharge (DBD) plasma-treated polyamide 6,6 fabric (PA66). The PVP-AgNPs dispersions were deposited onto PA66 by spray and exhaustion methods. The exhaustion method showed a higher amount of deposited AgNPs. Water and water-alginate dispersions presented similar results. Ethanol amphiphilic character showed more affinity to AgNPs and PA66 fabric, allowing better uniform surface distribution of nanoparticles. Antimicrobial effect in E. coli showed good results in all the samples obtained by exhaustion method but using spray method only the DBD plasma treated samples displayed antimicrobial activity (log reduction of 5). Despite the better distribution achieved using ethanol as a solvent, water dispersion samples with DBD plasma treatment displayed better antimicrobial activity against S. aureus bacteria in both exhaustion (log reduction of 1.9) and spray (methods log reduction of 1.6) due to the different oxidation states of PA66 surface interacting with PVP-AgNPs, as demonstrated by X-ray Photoelectron Spectroscopy (XPS) analysis. Spray method using the water-suspended PVP-AgNPs onto DBD plasma-treated samples is much faster, less agglomerating and uses 10 times less PVP-AgNPs dispersion than the exhaustion method to obtain an antimicrobial effect in both S. aureus and E. coli.
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Affiliation(s)
- Ana I. Ribeiro
- 2C2T - Centro de Ciência e Tecnologia Têxtil, Universidade do Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; (A.I.R.); (H.P.F.); (A.P.S.)
| | - Martina Modic
- Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (M.M.); (U.C.)
| | - Uros Cvelbar
- Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia; (M.M.); (U.C.)
| | - Gheorghe Dinescu
- National Institute for Lasers, Plasma and Radiation Physics, Strada Atomiștilor 409, 077125 Măgurele, Romania; (G.D.); (B.M.)
| | - Bogdana Mitu
- National Institute for Lasers, Plasma and Radiation Physics, Strada Atomiștilor 409, 077125 Măgurele, Romania; (G.D.); (B.M.)
| | - Anton Nikiforov
- Centexbel Ghent, Technologie Park 7, 9052 Ghent, Belgium; (A.N.); (C.L.); (I.K.); (M.D.V.)
| | - Christophe Leys
- Centexbel Ghent, Technologie Park 7, 9052 Ghent, Belgium; (A.N.); (C.L.); (I.K.); (M.D.V.)
| | - Iryna Kuchakova
- Centexbel Ghent, Technologie Park 7, 9052 Ghent, Belgium; (A.N.); (C.L.); (I.K.); (M.D.V.)
| | - Mike De Vrieze
- Centexbel Ghent, Technologie Park 7, 9052 Ghent, Belgium; (A.N.); (C.L.); (I.K.); (M.D.V.)
| | - Helena P. Felgueiras
- 2C2T - Centro de Ciência e Tecnologia Têxtil, Universidade do Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; (A.I.R.); (H.P.F.); (A.P.S.)
| | - António P. Souto
- 2C2T - Centro de Ciência e Tecnologia Têxtil, Universidade do Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; (A.I.R.); (H.P.F.); (A.P.S.)
| | - Andrea Zille
- 2C2T - Centro de Ciência e Tecnologia Têxtil, Universidade do Minho, Campus de Azurém, 4800-058 Guimarães, Portugal; (A.I.R.); (H.P.F.); (A.P.S.)
- Correspondence:
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Kuchakova I, Ionita MD, Ionita ER, Lazea-Stoyanova A, Brajnicov S, Mitu B, Dinescu G, De Vrieze M, Cvelbar U, Zille A, Leys C, Yu Nikiforov A. Atmospheric Pressure Plasma Deposition of Organosilicon Thin Films by Direct Current and Radio-frequency Plasma Jets. Materials (Basel) 2020; 13:ma13061296. [PMID: 32183006 PMCID: PMC7143598 DOI: 10.3390/ma13061296] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 03/09/2020] [Accepted: 03/11/2020] [Indexed: 11/16/2022]
Abstract
Thin film deposition with atmospheric pressure plasmas is highly interesting for industrial demands and scientific interests in the field of biomaterials. However, the engineering of high-quality films by high-pressure plasmas with precise control over morphology and surface chemistry still poses a challenge. The two types of atmospheric-pressure plasma depositions of organosilicon films by the direct and indirect injection of hexamethyldisiloxane (HMDSO) precursor into a plasma region were chosen and compared in terms of the films chemical composition and morphology to address this. Although different methods of plasma excitation were used, the deposition of inorganic films with above 98% of SiO2 content was achieved for both cases. The chemical structure of the films was insignificantly dependent on the substrate type. The deposition in the afterglow of the DC discharge resulted in a soft film with high roughness, whereas RF plasma deposition led to a smoother film. In the case of the RF plasma deposition on polymeric materials resulted in films with delamination and cracks formation. Lastly, despite some material limitations, both deposition methods demonstrated significant potential for SiOx thin-films preparation for a variety of bio-related substrates, including glass, ceramics, metals, and polymers.
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Affiliation(s)
- Iryna Kuchakova
- Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41 B4, 9000 Gent, Belgium; (C.L.); (A.Y.N.)
- Correspondence: (I.K.); (E.-R.I.)
| | - Maria Daniela Ionita
- National Institute for Lasers, Plasma and Radiation Physics, Magurele-Bucharest, MG-36, RO 077125 Ilfov, Romania; (M.D.I.); (A.L.-S.); (S.B.); (B.M.); (G.D.)
| | - Eusebiu-Rosini Ionita
- National Institute for Lasers, Plasma and Radiation Physics, Magurele-Bucharest, MG-36, RO 077125 Ilfov, Romania; (M.D.I.); (A.L.-S.); (S.B.); (B.M.); (G.D.)
- Correspondence: (I.K.); (E.-R.I.)
| | - Andrada Lazea-Stoyanova
- National Institute for Lasers, Plasma and Radiation Physics, Magurele-Bucharest, MG-36, RO 077125 Ilfov, Romania; (M.D.I.); (A.L.-S.); (S.B.); (B.M.); (G.D.)
| | - Simona Brajnicov
- National Institute for Lasers, Plasma and Radiation Physics, Magurele-Bucharest, MG-36, RO 077125 Ilfov, Romania; (M.D.I.); (A.L.-S.); (S.B.); (B.M.); (G.D.)
| | - Bogdana Mitu
- National Institute for Lasers, Plasma and Radiation Physics, Magurele-Bucharest, MG-36, RO 077125 Ilfov, Romania; (M.D.I.); (A.L.-S.); (S.B.); (B.M.); (G.D.)
| | - Gheorghe Dinescu
- National Institute for Lasers, Plasma and Radiation Physics, Magurele-Bucharest, MG-36, RO 077125 Ilfov, Romania; (M.D.I.); (A.L.-S.); (S.B.); (B.M.); (G.D.)
| | - Mike De Vrieze
- Centexbel, Technologiepark-Zwijnaarde 70, 9052 Gent, Belgium;
| | - Uroš Cvelbar
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;
| | - Andrea Zille
- 2C2T-Centro de Ciência e Tecnologia Têxtil, Universidade do Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;
| | - Christophe Leys
- Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41 B4, 9000 Gent, Belgium; (C.L.); (A.Y.N.)
| | - Anton Yu Nikiforov
- Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41 B4, 9000 Gent, Belgium; (C.L.); (A.Y.N.)
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Uboldi C, Sanles Sobrido M, Bernard E, Tassistro V, Herlin-Boime N, Vrel D, Garcia-Argote S, Roche S, Magdinier F, Dinescu G, Malard V, Lebaron-Jacobs L, Rose J, Rousseau B, Delaporte P, Grisolia C, Orsière T. In Vitro Analysis of the Effects of ITER-Like Tungsten Nanoparticles: Cytotoxicity and Epigenotoxicity in BEAS-2B Cells. Nanomaterials (Basel) 2019; 9:nano9091233. [PMID: 31480309 PMCID: PMC6780084 DOI: 10.3390/nano9091233] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 08/22/2019] [Accepted: 08/26/2019] [Indexed: 12/23/2022]
Abstract
Tungsten was chosen as a wall component to interact with the plasma generated by the International Thermonuclear Experimental fusion Reactor (ITER). Nevertheless, during plasma operation tritiated tungsten nanoparticles (W-NPs) will be formed and potentially released into the environment following a Loss-Of-Vacuum-Accident, causing occupational or accidental exposure. We therefore investigated, in the bronchial human-derived BEAS-2B cell line, the cytotoxic and epigenotoxic effects of two types of ITER-like W-NPs (plasma sputtering or laser ablation), in their pristine, hydrogenated, and tritiated forms. Long exposures (24 h) induced significant cytotoxicity, especially for the hydrogenated ones. Plasma W-NPs impaired cytostasis more severely than the laser ones and both types and forms of W-NPs induced significant micronuclei formation, as shown by cytokinesis-block micronucleus assay. Single DNA strand breaks, potentially triggered by oxidative stress, occurred upon exposure to W-NPs and independently of their form, as observed by alkaline comet assay. After 24 h it was shown that more than 50% of W was dissolved via oxidative dissolution. Overall, our results indicate that W-NPs can affect the in vitro viability of BEAS-2B cells and induce epigenotoxic alterations. We could not observe significant differences between plasma and laser W-NPs so their toxicity might not be triggered by the synthesis method.
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Affiliation(s)
- Chiara Uboldi
- CNRS, IRD, IMBE, Avignon Université, Aix Marseille Université, 13005 Marseille, France
| | - Marcos Sanles Sobrido
- CNRS, IRD, INRA, Coll France, CEREGE, Aix Marseille Université, 13545 Aix-en-Provence, France
| | - Elodie Bernard
- CNRS, LP3, Aix Marseille Université, 13005 Marseille, France
- CEA, CNRS, BIAM, Aix Marseille Université, 13108 Saint Paul-Lez-Durance, France
| | - Virginie Tassistro
- CNRS, IRD, IMBE, Avignon Université, Aix Marseille Université, 13005 Marseille, France
| | | | - Dominique Vrel
- LSPM, Université Paris 13, UPR 3407 CNRS, 93430 Villetaneuse, France
| | | | - Stéphane Roche
- INSERM, MMG, Aix Marseille Université, 13005 Marseille, France
| | | | - Gheorghe Dinescu
- INFLPR, 409 Atomistilor Street, Magurele, 77125 Bucharest, Romania
| | - Véronique Malard
- CEA, CNRS, BIAM, Aix Marseille Université, 13108 Saint Paul-Lez-Durance, France
| | | | - Jerome Rose
- CNRS, IRD, INRA, Coll France, CEREGE, Aix Marseille Université, 13545 Aix-en-Provence, France
| | - Bernard Rousseau
- CEA, SCBM, Université Paris Saclay, 91191 Gif-sur-Yvette, France
| | | | | | - Thierry Orsière
- CNRS, IRD, IMBE, Avignon Université, Aix Marseille Université, 13005 Marseille, France.
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12
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Achour A, Islam M, Vizireanu S, Ahmad I, Akram MA, Saeed K, Dinescu G, Pireaux JJ. Orange/Red Photoluminescence Enhancement Upon SF 6 Plasma Treatment of Vertically Aligned ZnO Nanorods. Nanomaterials (Basel) 2019; 9:nano9050794. [PMID: 31126109 PMCID: PMC6567295 DOI: 10.3390/nano9050794] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 05/13/2019] [Accepted: 05/20/2019] [Indexed: 01/23/2023]
Abstract
Although the origin and possible mechanisms for green and yellow emission from different zinc oxide (ZnO) forms have been extensively investigated, the same for red/orange PL emission from ZnO nanorods (nR) remains largely unaddressed. In this work, vertically aligned zinc oxide nanorods arrays (ZnO nR) were produced using hydrothermal process followed by plasma treatment in argon/sulfur hexafluoride (Ar/SF6) gas mixture for different time. The annealed samples were highly crystalline with ~45 nm crystallite size, (002) preferred orientation, and a relatively low strain value of 1.45 × 10−3, as determined from X-ray diffraction pattern. As compared to as-deposited ZnO nR, the plasma treatment under certain conditions demonstrated enhancement in the room temperature photoluminescence (PL) emission intensity, in the visible orange/red spectral regime, by a factor of 2. The PL intensity enhancement induced by SF6 plasma treatment may be attributed to surface chemistry modification as confirmed by X-ray photoelectron spectroscopy (XPS) studies. Several factors including presence of hydroxyl group on the ZnO surface, increased oxygen level in the ZnO lattice (OL), generation of F–OH and F–Zn bonds and passivation of surface states and bulk defects are considered to be active towards red/orange emission in the PL spectrum. The PL spectra were deconvoluted into component Gaussian sub-peaks representing transitions from conduction-band minimum (CBM) to oxygen interstitials (Oi) and CBM to oxygen vacancies (VO) with corresponding photon energies of 2.21 and 1.90 eV, respectively. The optimum plasma treatment route for ZnO nanostructures with resulting enhancement in the PL emission offers strong potential for photonic applications such as visible wavelength phosphors.
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Affiliation(s)
- Amine Achour
- Laboratoire Interdisciplinaire de Spectroscopie Electronique (LISE), Namur Institute of Structured Matter (NISM), University of Namur, 61 Rue de Bruxelles, 5000 Namur, Belgium.
| | - Mohammad Islam
- Center of Excellence for Research in Engineering Materials, Deanship of Scientific Research, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
| | - Sorin Vizireanu
- National Institute for Laser, Plasma and Radiation Physics, Magurele, P.O. Box MG-16, 077125 Bucharest, Romania.
| | - Iftikhar Ahmad
- Center of Excellence for Research in Engineering Materials, Deanship of Scientific Research, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
| | - Muhammad Aftab Akram
- School of Chemical and Materials Engineering, National University of Sciences and Technology, Sector H-12, Islamabad 44000, Pakistan.
| | - Khalid Saeed
- Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Magurele, P.O. Box MG-16, 077125 Bucharest, Romania.
| | - Jean-Jacques Pireaux
- Laboratoire Interdisciplinaire de Spectroscopie Electronique (LISE), Namur Institute of Structured Matter (NISM), University of Namur, 61 Rue de Bruxelles, 5000 Namur, Belgium.
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Siteavu M, Darie L, Dumitru L, Dinescu G, Ciobotaru E. Preliminary data regarding syndromic surveillance in captive wild waterfowl. J Comp Pathol 2019. [DOI: 10.1016/j.jcpa.2018.10.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Panaitescu DM, Ionita ER, Nicolae CA, Gabor AR, Ionita MD, Trusca R, Lixandru BE, Codita I, Dinescu G. Poly(3-hydroxybutyrate) Modified by Nanocellulose and Plasma Treatment for Packaging Applications. Polymers (Basel) 2018; 10:E1249. [PMID: 30961174 PMCID: PMC6401738 DOI: 10.3390/polym10111249] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 11/07/2018] [Accepted: 11/08/2018] [Indexed: 11/28/2022] Open
Abstract
In this work, a new eco-friendly method for the treatment of poly(3-hydroxybutyrate) (PHB) as a candidate for food packaging applications is proposed. Poly(3-hydroxybutyrate) was modified by bacterial cellulose nanofibers (BC) using a melt compounding technique and by plasma treatment or zinc oxide (ZnO) nanoparticle plasma coating for better properties and antibacterial activity. Plasma treatment preserved the thermal stability, crystallinity and melting behavior of PHB‒BC nanocomposites, regardless of the amount of BC nanofibers. However, a remarkable increase of stiffness and strength and an increase of the antibacterial activity were noted. After the plasma treatment, the storage modulus of PHB having 2 wt % BC increases by 19% at room temperature and by 43% at 100 °C. The tensile strength increases as well by 21%. In addition, plasma treatment also inhibits the growth of Staphylococcus aureus and Escherichia coli by 44% and 63%, respectively. The ZnO plasma coating led to important changes in the thermal and mechanical behavior of PHB‒BC nanocomposite as well as in the surface structure and morphology. Strong chemical bonding of the metal nanoparticles on PHB surface following ZnO plasma coating was highlighted by infrared spectroscopy. Moreover, the presence of a continuous layer of self-aggregated ZnO nanoparticles was demonstrated by scanning electron microscopy, ZnO plasma treatment completely inhibiting growth of Staphylococcus aureus. A plasma-treated PHB‒BC nanocomposite is proposed as a green solution for the food packaging industry.
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Affiliation(s)
- Denis Mihaela Panaitescu
- National Institute for Research & Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Eusebiu Rosini Ionita
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Cristian-Andi Nicolae
- National Institute for Research & Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Augusta Raluca Gabor
- National Institute for Research & Development in Chemistry and Petrochemistry-ICECHIM, Polymer Department, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Maria Daniela Ionita
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Roxana Trusca
- Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania.
| | - Brindusa-Elena Lixandru
- "Cantacuzino" National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania.
| | - Irina Codita
- "Cantacuzino" National Medical-Military Institute for Research and Development, 103 Spl. Independentei, 050096 Bucharest, Romania.
- Carol Davila University of Medicine and Pharmacy, Bulevardul Eroii Sanitari 8, 050474 Bucharest, Romania.
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
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Vizireanu S, Panaitescu DM, Nicolae CA, Frone AN, Chiulan I, Ionita MD, Satulu V, Carpen LG, Petrescu S, Birjega R, Dinescu G. Cellulose defibrillation and functionalization by plasma in liquid treatment. Sci Rep 2018; 8:15473. [PMID: 30341312 PMCID: PMC6195520 DOI: 10.1038/s41598-018-33687-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 10/03/2018] [Indexed: 11/13/2022] Open
Abstract
Submerged liquid plasma (SLP) is a new and promising method to modify powder materials. Up to now, this technique has been mostly applied to carbonaceous materials, however, SLP shows great potential as a low-cost and environmental-friendly method to modify cellulose. In this work we demonstrate the modification of microcrystalline cellulose (MCC) by applying the SLP combined with ultrasonication treatments. The plasma generated either in an inert (argon) or reactive (argon: oxygen or argon:nitrogen) gas was used in MCC dispersions in water or acetonitrile:water mixtures. An enhanced defibrillation of MCC has been observed following the application of SLP. Furthermore, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy have been applied to investigate the surface functionalization of MCC with oxygen or nitrogen moieties. Depending on the plasma treatment applied, poly (3-hydroxybutyrate) composites fabricated with the plasma modified cellulose fibers showed better thermal stability and mechanical properties than pristine PHB. This submerged liquid plasma processing method offers a unique approach for the activation of cellulose for defibrillation and functionalization, aiming towards an improved reinforcing ability of biopolymers.
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Affiliation(s)
- Sorin Vizireanu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Denis Mihaela Panaitescu
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania.
| | - Cristian Andi Nicolae
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Adriana Nicoleta Frone
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Ioana Chiulan
- Polymer Department, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Maria Daniela Ionita
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Veronica Satulu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Lavinia Gabriela Carpen
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Simona Petrescu
- Institute of Physical Chemistry "Ilie Murgulescu", Romanian Academy of Sciences, 202 Spl. Independentei, Bucharest, 060021, Romania
| | - Ruxandra Birjega
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele, Bucharest, Ilfov, 077125, Romania
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Kravets LI, Altynov VA, Yablokov MY, Gilman AB, Satulu V, Mitu B, Dinescu G. Investigation of Morphology and Chemical Structure of Nanosized Polytetrafluoroethylene Films Deposited on the Surface of Track-Etched Membranes by Plasma Processing. High Energy Chem 2018. [DOI: 10.1134/s0018143918040094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Panaitescu DM, Vizireanu S, Nicolae CA, Frone AN, Casarica A, Carpen LG, Dinescu G. Treatment of Nanocellulose by Submerged Liquid Plasma for Surface Functionalization. Nanomaterials (Basel) 2018; 8:E467. [PMID: 29949943 PMCID: PMC6070974 DOI: 10.3390/nano8070467] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/22/2018] [Accepted: 06/22/2018] [Indexed: 12/12/2022]
Abstract
Tailoring the surface properties of nanocellulose to improve the compatibility of components in polymer nanocomposites is of great interest. In this work, dispersions of nanocellulose in water and acetonitrile were functionalized by submerged plasmas, with the aim of increasing the quality of this reinforcing agent in biopolymer composite materials. Both the morphology and surface chemistry of nanocellulose were influenced by the application of a plasma torch and filamentary jet plasma in a liquid suspension of nanocellulose. Depending on the type of plasma source and gas mixture the surface chemistry was modified by the incorporation of oxygen and nitrogen containing functional groups. The treatment conditions which lead to nanocellulose based polymer nanocomposites with superior mechanical properties were identified. This work provides a new eco-friendly method for the surface functionalization of nanocellulose directly in water suspension, thus overcoming the disadvantages of chemical treatments.
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Affiliation(s)
- Denis Mihaela Panaitescu
- Department of Polymer, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Sorin Vizireanu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Cristian Andi Nicolae
- Department of Polymer, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Adriana Nicoleta Frone
- Department of Polymer, National Institute for Research and Development in Chemistry and Petrochemistry, 202 Spl. Independentei, 060021 Bucharest, Romania.
| | - Angela Casarica
- National Institute for Chemical-Pharmaceutical Research and Development, 112 Calea Vitan, 031299 Bucharest, Romania.
| | - Lavinia Gabriela Carpen
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, Magurele-Bucharest, 077125 Ilfov, Romania.
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Wu G, Choi EH, Chu PK, Dinescu G, Jung R, Zhao Y. Recent Applications of Scanning Microscopy in Surface Engineering. Scanning 2018; 2018:7546310. [PMID: 29861822 PMCID: PMC5976905 DOI: 10.1155/2018/7546310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 04/12/2018] [Indexed: 06/08/2023]
Affiliation(s)
| | - Eun-Ha Choi
- Kwangwoon University, Seoul, Republic of Korea
| | - Paul K. Chu
- City University of Hong Kong, Kowloon Tong, Hong Kong
| | - Gheorghe Dinescu
- National Institute for Laser, Plasma and Radiation Physics, Magurele, Ilfov, Romania
| | - Ranju Jung
- Kwangwoon University, Seoul, Republic of Korea
| | - Ying Zhao
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
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Kravets LI, Elinson VM, Ibragimov RG, Mitu B, Dinescu G. Plasma surface modification of polypropylene track-etched membrane to improve its performance properties. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1742-6596/982/1/012011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Rizac R, Ciobotaru E, Dinescu G, Soare T, Militaru M. Traumatic Death Due to Forced Feeding in a Burmese Python. J Comp Pathol 2018. [DOI: 10.1016/j.jcpa.2017.10.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Kravets LI, Yablokov MY, Gilman AB, Shchegolikhin AN, Mitu B, Dinescu G. Micro- and nanofluidic diodes based on track-etched poly(ethylene terephthalate) membrane. High Energy Chem 2015. [DOI: 10.1134/s0018143915050070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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23
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Ion R, Vizireanu S, Stancu CE, Luculescu C, Cimpean A, Dinescu G. Surface plasma functionalization influences macrophage behavior on carbon nanowalls. Materials Science and Engineering: C 2015; 48:118-25. [DOI: 10.1016/j.msec.2014.11.064] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 10/24/2014] [Accepted: 11/28/2014] [Indexed: 12/22/2022]
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24
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Kravets LI, Gilman AB, Yablokov MY, Elinson VM, Mitu B, Dinescu G. Surface and electrochemical properties of polypropylene track membrane modified by plasma of non-polymerizing gases. RUSS J ELECTROCHEM+ 2013. [DOI: 10.1134/s1023193513070070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Nicolau AE, Merlan V, Dinescu G, Crăciun M, Kitkani A, Beuran M. [Perforation of hollow organs in the abdominal contusion: diagnostic features and prognostic factors of death]. Chirurgia (Bucur) 2012; 107:162-168. [PMID: 22712343] [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: 06/01/2023]
Abstract
UNLABELLED Blunt hollow viscus perforations (HVP) due to abdominal contusions (AC), although rare, are difficult to diagnose early and are associated with a high mortality. MATERIALS AND METHODS Our paper analyses retrospectively data from patients operated for HVP between January 2005 and January 2009, the efficiency of different diagnostic tools, mortality and prognostic factors for death. RESULTS There were 62 patients operated for HVP, 14 of which had isolated abdominal contusion and 48 were poly trauma patients. There were 9 women and 53 men, the mean age was 41.5 years (SD: +17,9), the mean ISS was 32.94 (SD: +15,94), 23 patients had associated solid viscus injuries (SVI). Clinical examination was irelevant for 16 of the 62 patients, abdominal Xray was false negative for 30 out of 35 patients and abdominal ultrasound was false negative for 16 out of 60 patients. Abdominal CT was initially false negative for 7 out of 38 patients: for 4 of them the abdominal CT was repeated and was positive for HVP, for 3 patients a diagnostic laparoscopy was performed. Direct signs for HVP on abdominal CT were present for 3 out of 38 patients. Diagnostic laparoscopy was performed for 7 patients with suspicion for HVP, and was positive for 6 of them and false negative for a patient with a duodenal perforation. Single organ perforations were present in 55 cases, multi organ perforations were present in 7 cases. There were 15 deaths (15.2%), most of them caused by haemodynamic instability (3 out of 6 patients) and associated lesions: SOL for 9 out of 23 cases, pelvic fracture (PF) for 6 out of 14 patients, craniocerebral trauma (CCT) for 12 out of 33 patients.Multivariate analysis showed that the prognostic factors for death were ISS value (p = 0,023) and associated CCT (odds ratio = 4,95; p = 0,017). The following factors were not confirmed as prognostic factors for death: age, haemodynamic instability, associated SVI, thoracic trauma (TT), pelvic fractures (PF), limbs fractures (LF) and admission-operation interval under 6 hours. CONCLUSIONS Hollow viscus perforations due to abdominal contusions have a high mortality, early diagnosis is difficult, repeated abdominal CT and the selective use of diagnostic laparoscopy for haemodynamic stable patients with ambiguous clinical examination and diagnostic imaging are salutary. Prognostic factors for death were the ISS value and associated craniocerebral trauma.
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Affiliation(s)
- A E Nicolau
- Clinica de Chirurgie, Spitalul Clinic de Urgentă Bucureşti, România.
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Kravets LI, Dmitriev SN, Altynov VA, Satulu V, Mitu B, Dinescu G. Synthesis of bilayer composite nanomembranes with conductivity asymmetry. RUSS J ELECTROCHEM+ 2011. [DOI: 10.1134/s1023193511040094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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28
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Kravets LI, Dmitriev SN, Satulu V, Mitu B, Dinescu G. Preparation of polymeric composite nanomembranes with conductivity asymmetry. RUSS J APPL CHEM+ 2010. [DOI: 10.1134/s1070427210090223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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30
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Dinescu G, Ionascu I, Ciobotaru E, Soare T, Militaru M. The Importance of Cytological Examination in Canine Oral Neoplasia. J Comp Pathol 2010. [DOI: 10.1016/j.jcpa.2010.09.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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Militaru M, Ciobotaru E, Dinescu G, Diaconescu A, Ionascu I, Cranganu D. Cytological Investigation of Mammary Gland Tumours in the Queen and Bitch. J Comp Pathol 2010. [DOI: 10.1016/j.jcpa.2010.09.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Dinescu G, Curtseit S, Ciobotaru E, Soare T, Militaru D, Militaru M. Elements of the Epidemiology of Canine Mast Cell Tumour diagnosed by Cytological Examination. J Comp Pathol 2010. [DOI: 10.1016/j.jcpa.2010.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Ciobotaru E, Tudor L, Constantinescu C, Dinescu G, Soare T, Militaru M. Pseudomonas aeruginosa-Induced Lesions in Non-Venomous Snakes. J Comp Pathol 2009. [DOI: 10.1016/j.jcpa.2009.08.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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35
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Dinescu G, Pop A, Togoe I, Militaru M, Ciobotaru E, Soare T. Modifications of Visceral Lymphoid Tissue Induced in Chickens by an Orally Delivered Lectin. J Comp Pathol 2009. [DOI: 10.1016/j.jcpa.2009.08.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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36
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Nicolau AE, Gheju I, Micu B, Kitkani A, Iftimie I, Dinescu G, Mirea L, Ungureanu R. Laparoscopic repair of post-traumatic diaphragmatic hernia: a case report. Chirurgia (Bucur) 2009; 104:341-345. [PMID: 19601469] [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: 05/28/2023]
Abstract
In a large number of cases, post-traumatic diaphragmatic hernias (PTDH) are a consequence of occult diaphragmatic injuries associated with penetrating abdominal trauma. We present a case of a 26-year-old male patient who, 2 months prior to the current admission, sustained a non-penetrating stab wound to the left anterior chest below the nipple. Upon presentation the patient complained of epigastric pain radiated to the left shoulder, and nausea and vomiting. The chest X-ray, and abdominal and thoracic CT scan were inconclusive. The patient was sutured and discharged. The laparoscopic approach was selected as a diagnostic and minimally invasive therapeutic method. The suspected diagnosis of PTDH was confirmed. The herniated organs (transverse colon, small bowel loops, and greater omentum) were reduced, and the diaphragmatic defect was sutured by placing 3 non-resorbable 2.0 knots. The suture was reinforced with a composite mesh affixed with resorbable clips. Postoperative period was uneventful, and the patient was discharged 4 days later.
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Affiliation(s)
- A E Nicolau
- Clinica Chirurgie, Spitalul de Urgenţă, Bucureşti.
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Kravets LI, Satulu V, Dinescu G, Gil’man AB, Lizunov NE. Preparation of composite membranes by means of plasma polymerization of tiophene. High Energy Chem 2008. [DOI: 10.1134/s001814390805010x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Abstract
We report on the operation and characteristics of radio frequency (RF) plasma beam sources based on the expansion of the discharge outside of limited spaces with small interelectrode gaps. The appropriate electrode configuration, combined with high mass flow values and appropriate power levels, leads to small- or large-size plasma jets, working stably at low, intermediate, and atmospheric pressures. The sources are promising tools for a wide range of applications in thin film deposition, surface modification, and cleaning, including the case of temperature-sensitive substrates.
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Affiliation(s)
- Gheorghe Dinescu
- 1National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, Magurele MG-36, RO 77125, Bucharest, Romania
| | - Eusebiu R. Ionita
- 1National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, Magurele MG-36, RO 77125, Bucharest, Romania
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Dinescu G, Ionita E, Luciu I, Grisolia C. Flexible small size radiofrequency plasma torch for Tokamak wall cleaning. Fusion Engineering and Design 2007. [DOI: 10.1016/j.fusengdes.2007.06.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Turculet C, Feodor T, Dinescu G, Petrică R, Rădulescu S, Beuran M. [Bi-layer hernioplasty in day surgery]. Chirurgia (Bucur) 2007; 102:433-438. [PMID: 17966941] [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: 05/25/2023]
Abstract
Nowadays the modern surgical techniques of hernia repair highly consider not only the decrease of the recurrence rate, but also a fast recovery, minimal postoperative pain and low costs of this type of surgery. This paper presents the preliminary results of a study performed on 41 patients diagnosed with inguinal hernia and operated under local anesthesia, as day surgery cases, during 2004-2006. The selection of the patients was performed under the "Guidelines and Standards for Day Surgery in Australia". We used local "step by step" anesthesia with a solution of 20 ml of lydocaine 1%, 20 ml of marcaine 0.5% and and 20 ml of NaCl 0.9%. The surgical procedure based on the sutureless technique "Gilbert", implied the placement of two polypropylene meshes: one of them introduced through the deep inguinal ring, and the other one in the inguinal channel, minimally fixed. We studied: intraoperative comfort and postoperative pain of the patients, problems related to the surgical technique, the operative time, complications and the recurrence rate. The follow-up period was 14 months. 85.36% of the patients had a very good intraoperative comfort, and only 14.64 % of them needed supplementary intravenous analgesia; none of the patients needed conversion to general anesthesia. The mean operative time was 65 minutes. The complications were: seroma (3 patients) and hematoma (1 patient), all of them treated conservatively. No recurrence was noticed. From this preliminary study it seems that the surgical treatment of the inguinal hernia with double polypropylene mesh, under local anesthesia and as day surgery is feasible and secure. The minimal postoperative complications and the patients' satisfaction show that the new concept of day surgery must be promoted in our surgery clinics. However, we must emphasize that, in order to obtain good results on a larger scale, certain measures are mandatory, such as: organizing a special area and circuits for day surgery, nursing at home, precise inform of the patients (video samples), the use of modern communication (internet) with patients.
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Constantinovici A, Drăghici L, Constantinescu A, Dinescu G. [Characteristics of the onset in cavum tumors]. Rev Med Interna Neurol Psihiatr Neurochir Dermatovenerol Neurol Psihiatr Neurochir 1988; 33:277-82. [PMID: 3255156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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42
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Turbatu D, Orban A, Nicolau P, Dinescu G. [Contribution of endoscopic retrograde pancreatocholangiography (ERCP) to the diagnosis of hepatopancreatic diseases]. Rev Med Interna Neurol Psihiatr Neurochir Dermatovenerol Med Interna 1984; 36:181-9. [PMID: 6146177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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43
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Turbatu D, Cârstea M, Dinescu G. [Retrograde pancreato-cholangiography by the endoscopic method]. Rev Chir Oncol Radiol O R L Oftalmol Stomatol Chir 1982; 31:437-42. [PMID: 6220429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Endoscopic retrograde pancreato-cholangiography is a modern technique introduced as a result of the development of digestive fiber optics and which is used for the diagnosis and the treatment of biliary, and pancreatic affections, as well as for affections involving the Vater ampulla. Besides the advantages, the indications and the technique the authors also describe the normal aspect of the pancreas according to established indicators as defined by experienced specialists. The results are also commented in the paper, as well as the importance of this procedure as compared with other techniques.
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44
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Pănoiu L, Dobrescu A, Petrescu R, Sternberg I, Dinescu G, Ionescu C, Bărbulescu V, Both R. Epidemiological investigations on viral hepatitis in preschool and school communities. Note II. Evaluation of the prophylactic efficiency of standard gammaglobulin administration. Virologie (Montrouge) 1979; 30:103-7. [PMID: 88794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
At the beginning of the 1977--1978 schoolyear 10% standard gammaglobulin (0.03 ml/kg body weight) was administered to 974 preschool children and 530 schoolchildren. Representative groups of children were tested serologically and virologically before gammaglobulin administration and 3 months afterwards. No statistically significant reductions of viral hepatitis morbidity were recorded in the protected groups as against controls.
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Săvulescu V, Leu A, Cristea H, Dinescu G, Meleaşă M. [Segmental benign stenosis of the hepatic duct]. Rev Chir Oncol Radiol O R L Oftalmol Stomatol Chir 1975; 24:207-8. [PMID: 127224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Stefaniu A, Romaşcanu G, Dinescu G, Ene F, Stefan A. [Histiocytosis X with bilateral mastoid localization in adults. Pathogenic considerations]. Rev Chir Oncol Radiol O R L Oftalmol Stomatol Otorinolaringol 1975; 20:65-9. [PMID: 127289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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47
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Romaşcanu G, Stefaniu A, Botescu M, Szatmary R, Bageac C, Călăraşu R, Dinescu G, Ene F, Stefan A. [Anaphylactic reactions to alpha-chymotrypsin]. Otorinolaringologie 1970; 15:111-6. [PMID: 5428221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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48
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Călăraşu R, Romaşcanu G, Dinescu G, Popescu P, Călăraşu F. [Horizontal glottic partial laryngectomy. I]. Otorinolaringologie 1970; 15:51-8. [PMID: 5427094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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49
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Lucian M, Stefănescu V, Mihăilescu R, Manoliu M, Dobrescu A, Sternbert I, Dinescu G, Ciureş Z, Dreptate N, Selaru A. [Effectiveness of anti-smallpox vaccination given concomitantly with administration of gamma-globulin. I. Epidemiologic study]. Microbiol Parazitol Epidemiol (Bucur) 1969; 14:505-9. [PMID: 4190937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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50
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Stefaniu A, Romaşcanu G, Tigănuş I, Călăraşu R, Dinescu G. [Petrous apexitis with aseptic serous meningitis during chronic otomastoiditis and diabetes mellitus]. Otorinolaringologie 1969; 14:269-73. [PMID: 5356071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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