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Paul D, Mozetic M, Zaplotnik R, Primc G, Đonlagić D, Vesel A. A Review of Recombination Coefficients of Neutral Oxygen Atoms for Various Materials. Materials (Basel) 2023; 16:1774. [PMID: 36902889 PMCID: PMC10004365 DOI: 10.3390/ma16051774] [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: 01/09/2023] [Revised: 02/13/2023] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Relevant data on heterogeneous surface recombination of neutral oxygen atoms available in the scientific literature are reviewed and discussed for various materials. The coefficients are determined by placing the samples either in non-equilibrium oxygen plasma or its afterglow. The experimental methods used to determine the coefficients are examined and categorized into calorimetry, actinometry, NO titration, laser-induced fluorescence, and various other methods and their combinations. Some numerical models for recombination coefficient determination are also examined. Correlations are drawn between the experimental parameters and the reported coefficients. Different materials are examined and categorized according to reported recombination coefficients into catalytic, semi-catalytic, and inert materials. Measurements from the literature of the recombination coefficients for some materials are compiled and compared, along with the possible system pressure and material surface temperature dependence of the materials' recombination coefficient. A large scattering of results reported by different authors is discussed, and possible explanations are provided.
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Affiliation(s)
- Domen Paul
- Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
- Jozef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Miran Mozetic
- Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Rok Zaplotnik
- Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Gregor Primc
- Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Denis Đonlagić
- Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska cesta 46, 2000 Maribor, Slovenia
| | - Alenka Vesel
- Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
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2
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Tharayil A, Rajakumari R, Mozetic M, Primc G, Thomas S. Contact transmission of SARS-CoV-2 on fomite surfaces: surface survival and risk reduction. Interface Focus 2022; 12:20210042. [PMID: 34956610 PMCID: PMC8662391 DOI: 10.1098/rsfs.2021.0042] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 05/15/2021] [Accepted: 11/02/2021] [Indexed: 12/13/2022] Open
Abstract
There is an unprecedented concern regarding the viral strain SARS-CoV-2 and especially its respiratory disease more commonly known as COVID-19. SARS-CoV-2 virus has the ability to survive on different surfaces for extended periods, ranging from days up to months. The new infectious properties of SARS-CoV-2 vary depending on the properties of fomite surfaces. In this review, we summarize the risk factors involved in the indirect transmission pathways of SARS-CoV-2 strains on fomite surfaces. The main mode of indirect transmission is the contamination of porous and non-porous inanimate surfaces such as textile surfaces that include clothes and most importantly personal protective equipment like personal protective equipment kits, masks, etc. In the second part of the review, we highlight materials and processes that can actively reduce the SARS-CoV-2 surface contamination pattern and the associated transmission routes. The review also focuses on some general methodologies for designing advanced and effective antiviral surfaces by physical and chemical modifications, viral inhibitors, etc.
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Affiliation(s)
- Abhimanyu Tharayil
- School of Energy Materials, Mahatma Gandhi University, Kerala 686560, India
| | - R. Rajakumari
- International and Inter-University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala 686560, India
| | - Miran Mozetic
- Department of Surface Engineering, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
| | - Gregor Primc
- Department of Surface Engineering, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
| | - Sabu Thomas
- School of Energy Materials, Mahatma Gandhi University, Kerala 686560, India
- International and Inter-University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala 686560, India
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Karakurt I, Ozaltin K, Vargun E, Kucerova L, Suly P, Harea E, Minařík A, Štěpánková K, Lehocky M, Humpolícek P, Vesel A, Mozetic M. Controlled release of enrofloxacin by vanillin-crosslinked chitosan-polyvinyl alcohol blends. Mater Sci Eng C Mater Biol Appl 2021; 126:112125. [PMID: 34082942 DOI: 10.1016/j.msec.2021.112125] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/24/2021] [Accepted: 04/18/2021] [Indexed: 11/28/2022]
Abstract
In transdermal drug delivery applications uniform drug distribution and sustained release are of great importance to decrease the side effects. In this direction in the present research, vanillin crosslinked chitosan (CS) and polyvinyl alcohol (PVA) blend based matrix-type transdermal system was prepared by casting and drying of aqueous solutions for local delivery of enrofloxacin (ENR) drug. Subsequently, the properties including the morphology, chemical structure, thermal behavior, tensile strength, crosslinking degree, weight uniformity, thickness, swelling and drug release of the CS-PVA blend films before and after crosslinking were characterized. In vitro drug release profiles showed the sustained release of ENR by the incorporation of vanillin as a crosslinker into the CS-PVA polymer matrix. Furthermore, the release kinetic profiles revealed that the followed mechanism for all samples was Higuchi and the increase of vanillin concentration in the blend films resulted in the change of diffusion mechanism from anomalous transport to Fickian diffusion. Overall, the obtained results suggest that the investigated vanillin crosslinked CS-PVA matrix-type films are potential candidates for transdermal drug delivery system.
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Affiliation(s)
- Ilkay Karakurt
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Kadir Ozaltin
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Elif Vargun
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; Department of Chemistry, Mugla Sitki Kocman University, Kotekli, 48000 Mugla, Turkey.
| | - Liliana Kucerova
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Pavol Suly
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Evghenii Harea
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 76001 Zlín, Czech Republic.
| | - Antonín Minařík
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 76001 Zlín, Czech Republic.
| | - Kateřina Štěpánková
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
| | - Marian Lehocky
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 76001 Zlín, Czech Republic.
| | - Petr Humpolícek
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, 76001 Zlín, Czech Republic.
| | - Alenka Vesel
- Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia.
| | - Miran Mozetic
- Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia.
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Ozaltin K, Di Martino A, Capakova Z, Lehocky M, Humpolicek P, Saha T, Vesela D, Mozetic M, Saha P. Plasma Mediated Chlorhexidine Immobilization onto Polylactic Acid Surface via Carbodiimide Chemistry: Antibacterial and Cytocompatibility Assessment. Polymers (Basel) 2021; 13:polym13081201. [PMID: 33917700 PMCID: PMC8068050 DOI: 10.3390/polym13081201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/05/2021] [Accepted: 04/06/2021] [Indexed: 01/18/2023] Open
Abstract
The development of antibacterial materials has great importance in avoiding bacterial contamination and the risk of infection for implantable biomaterials. An antibacterial thin film coating on the surface via chemical bonding is a promising technique to keep native bulk material properties unchanged. However, most of the polymeric materials are chemically inert and highly hydrophobic, which makes chemical agent coating challenging Herein, immobilization of chlorhexidine, a broad-spectrum bactericidal cationic compound, onto the polylactic acid surface was performed in a multistep physicochemical method. Direct current plasma was used for surface functionalization, followed by carbodiimide chemistry to link the coupling reagents of N-(3-Dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDAC) and N-Hydroxysuccinimide (NHs) to create a free bonding site to anchor the chlorhexidine. Surface characterizations were performed by water contact angle test, X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The antibacterial activity was tested using Staphylococcus aureus and Escherichia coli. Finally, in vitro cytocompatibility of the samples was studied using primary mouse embryonic fibroblast cells. It was found that all samples were cytocompatible and the best antibacterial performance observed was the Chlorhexidine immobilized sample after NHs activation.
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Affiliation(s)
- Kadir Ozaltin
- Center of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; (A.D.M.); (Z.C.); (M.L.); (P.H.); (D.V.); (P.S.)
- Correspondence: ; Tel.: +420-576031741
| | - Antonio Di Martino
- Center of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; (A.D.M.); (Z.C.); (M.L.); (P.H.); (D.V.); (P.S.)
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, Lenin Av. 30, 634050 Tomsk, Russia
| | - Zdenka Capakova
- Center of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; (A.D.M.); (Z.C.); (M.L.); (P.H.); (D.V.); (P.S.)
| | - Marian Lehocky
- Center of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; (A.D.M.); (Z.C.); (M.L.); (P.H.); (D.V.); (P.S.)
- Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 760 01 Zlin, Czech Republic
| | - Petr Humpolicek
- Center of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; (A.D.M.); (Z.C.); (M.L.); (P.H.); (D.V.); (P.S.)
- Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 760 01 Zlin, Czech Republic
| | - Tomas Saha
- Footwear Research Center, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, 760 01 Zlin, Czech Republic;
| | - Daniela Vesela
- Center of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; (A.D.M.); (Z.C.); (M.L.); (P.H.); (D.V.); (P.S.)
| | - Miran Mozetic
- Department of Surface Engineering and Optoelectronics, Jozef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia;
| | - Petr Saha
- Center of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic; (A.D.M.); (Z.C.); (M.L.); (P.H.); (D.V.); (P.S.)
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Raj I, Gopalakrishnan S, Abraham J, Maria HJ, Mozetic M, Aby Mathew T, Thomas S, Kalarikkal N. Self-assembled PMMA/ZnO nanocomposites with anti-staining and liquid barrier properties–their physicochemical perspectives and clinical implications as a biomaterial for Maxillofacial prosthetic rehabilitation. J Polym Res 2020. [DOI: 10.1007/s10965-020-02137-x] [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: 11/25/2022]
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Raj I, Mozetic M, Jayachandran VP, Jose J, Thomas S, Kalarikkal N. Fracture resistant, antibiofilm adherent, self-assembled PMMA/ZnO nanoformulations for biomedical applications: physico-chemical and biological perspectives of nano reinforcement. Nanotechnology 2018; 29:305704. [PMID: 29726837 DOI: 10.1088/1361-6528/aac296] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Antimicrobial, antibiofilm adherent, fracture resistant nano zinc oxide (ZnO NP) formulations based on poly methyl methacrylate (PMMA) matrix were developed using a facile ex situ compression moulding technique. These formulations demonstrated potent, long-term biofilm-resisting effects against Candida albicans (9000 CFU to 1000 CFU) and Streptococcus mutans. Proposed mechanism of biofilm resistance was the release of metallic ions/metal oxide by 'particle-corrosion'. MTT and cellular proliferation assays confirmed both qualitatively and quantitatively equal human skin fibroblast cell line proliferations (approximately 75%) on both PMMA/ZnO formulation and neat PMMA. Mechanical performance was evaluated over a range of filler loading, and theoretical models derived from Einstein, Guth, Thomas and Quemade were chosen to predict the modulus of the nanoformulations. All the models gave better fitting at lower filler content, which could be due to restricted mobility of the polymer chains by the constrained zone/interfacial rigid amorphous zone and also due to stress absorption by the highly energized NPs. Fracture mechanics were clearly described based on substantial experimental evidence surrounding crack prevention in the initial zones of fracture. Filler-polymer interactions at the morphological and structural levels were elucidated through FTIR, XRD, SEM, TEM and AFM analyses. Major clinical challenges in cancer patient rehabilitation and routine denture therapy are frequent breakage of the prostheses and microbial colonization on the prostheses/tissues. In the present study, we succeeded in developing an antimicrobial, mechanically improved fracture resistant, biocompatible nanoformulation in a facile manner without the bio-toxic effects of surface modifiers/functionalization. This PMMA/ZnO nanoformulation could serve as a cost effective breakthrough biomaterial in the field of prosthetic rehabilitation and local drug delivery scaffolds for abused tissues.
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Affiliation(s)
- Indu Raj
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam 686560, Kerala, India. Department of Prosthodontics, Government Dental College, Kottayam, Kerala, India
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Resnik M, Zaplotnik R, Mozetic M, Vesel A. Comparison of SF₆ and CF₄ Plasma Treatment for Surface Hydrophobization of PET Polymer. Materials (Basel) 2018; 11:ma11020311. [PMID: 29466293 PMCID: PMC5849008 DOI: 10.3390/ma11020311] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [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: 01/20/2018] [Revised: 02/13/2018] [Accepted: 02/18/2018] [Indexed: 11/27/2022]
Abstract
The fluorination of the polymer polyethylene terephthalate in plasma created from SF6 or CF4 gas at various pressures was investigated. The surface was analysed by X-ray photoelectron spectroscopy and water contact angle measurements, whereas the plasma was characterized by optical emission spectroscopy. The extent of the polymer surface fluorination was dependent on the pressure. Up to a threshold pressure, the amount of fluorine on the polymer surface and the surface hydrophobicity were similar, which was explained by the full dissociation of the SF6 and CF4 gases, leading to high concentrations of fluorine radicals in the plasma and thus causing the saturation of the polymer surface with fluorine functional groups. Above the threshold pressure, the amount of fluorine on the polymer surface significantly decreased, whereas the oxygen concentration increased, leading to the formation of the hydrophilic surface. This effect, which was more pronounced for the SF6 plasma, was explained by the electronegativity of both gases.
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Affiliation(s)
- Matic Resnik
- Jozef Stefan International Postgraduate School, Jamova 39, Ljubljana 1000, Slovenia.
- Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
| | - Rok Zaplotnik
- Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
| | - Miran Mozetic
- Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
| | - Alenka Vesel
- Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
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Ozaltin K, Lehocky M, Humpolicek P, Vesela D, Mozetic M, Novak I, Saha P. Preparation of active antibacterial biomaterials based on sparfloxacin, enrofloxacin, and lomefloxacin deposited on polyethylene. J Appl Polym Sci 2017. [DOI: 10.1002/app.46174] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Kadir Ozaltin
- Centre of Polymer Systems; Tomas Bata University in Zlín; Trida Tomase Bati 5678, Zlin 760 01 Czech Republic
| | - Marian Lehocky
- Centre of Polymer Systems; Tomas Bata University in Zlín; Trida Tomase Bati 5678, Zlin 760 01 Czech Republic
| | - Petr Humpolicek
- Centre of Polymer Systems; Tomas Bata University in Zlín; Trida Tomase Bati 5678, Zlin 760 01 Czech Republic
| | - Daniela Vesela
- Centre of Polymer Systems; Tomas Bata University in Zlín; Trida Tomase Bati 5678, Zlin 760 01 Czech Republic
| | - Miran Mozetic
- Department of Surface Engineering and Optoelectronics; Jozef Stefan Institute; Jamova Cesta 39, Ljubljana 1000 Slovenia
| | - Igor Novak
- Polymer Institute; Slovak Academy of Sciences; Dubravska Cesta 9, Bratislava 845 41 Slovakia
| | - Petr Saha
- Centre of Polymer Systems; Tomas Bata University in Zlín; Trida Tomase Bati 5678, Zlin 760 01 Czech Republic
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Recek N, Primc G, Vesel A, Mozetic M, Avila J, Razado-Colambo I, Asensio MC. Degradation of Albumin on Plasma-Treated Polystyrene by Soft X-ray Exposure. Polymers (Basel) 2016; 8:polym8070244. [PMID: 30974519 PMCID: PMC6431894 DOI: 10.3390/polym8070244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 04/25/2016] [Revised: 06/11/2016] [Accepted: 06/21/2016] [Indexed: 11/29/2022] Open
Abstract
Thin films of human serum albumin (HSA) were immobilized on polystyrene (PS) substrates previously functionalized either with polar or nonpolar functional groups. The functionalization was performed by treatment with cold gaseous plasma created in pure oxygen and tetrafluoromethane (CF4) plasmas, respectively. Samples were examined with soft X-rays in the photon energy range of 520 to 710 eV in the ANTARES beam line at SOLEIL Synchrotron. NEXAFS spectra of O K-edge and F K-edge were collected at different spots of the sample, and measurements at each spot were repeated many times. A strong degradation of the HSA protein was observed. The weakly irradiated samples exhibited strong absorption at 531.5 eV associated with the O 1s→π*amide transitions, and a broad non distinctive peak at 540 eV was attributed to the O 1s→σ*C–O transitions. Both peaks decreased with increasing irradiation time until they were completely replaced by a broad non-distinctive peak at around 532 eV, indicating the destruction of the original protein conformation. The shortage of the amide groups indicated breakage of the peptide bonds.
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Affiliation(s)
- Nina Recek
- Jozef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia.
| | - Gregor Primc
- Jozef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia.
| | - Alenka Vesel
- Jozef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia.
| | - Miran Mozetic
- Jozef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia.
| | - José Avila
- Synchrotron-SOLEIL & Université Paris-Saclay, Saint-Aubin, BP48, Gif sur Yvette Cedex F91192, France.
| | - Ivy Razado-Colambo
- Synchrotron-SOLEIL & Université Paris-Saclay, Saint-Aubin, BP48, Gif sur Yvette Cedex F91192, France.
| | - Maria C Asensio
- Synchrotron-SOLEIL & Université Paris-Saclay, Saint-Aubin, BP48, Gif sur Yvette Cedex F91192, France.
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Vesel A, Zaplotnik R, Modic M, Mozetic M. Hemocompatibility properties of a polymer surface treated in plasma containing sulfur. SURF INTERFACE ANAL 2016. [DOI: 10.1002/sia.5965] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Alenka Vesel
- Jozef Stefan Institute; Jamova 39 1000 Ljubljana Slovenia
| | - Rok Zaplotnik
- Jozef Stefan Institute; Jamova 39 1000 Ljubljana Slovenia
| | - Martina Modic
- Jozef Stefan Institute; Jamova 39 1000 Ljubljana Slovenia
| | - Miran Mozetic
- Jozef Stefan Institute; Jamova 39 1000 Ljubljana Slovenia
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11
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Vesel A, Kovac J, Primc G, Junkar I, Mozetic M. Effect of H₂S Plasma Treatment on the Surface Modification of a Polyethylene Terephthalate Surface. Materials (Basel) 2016; 9:ma9020095. [PMID: 28787895 PMCID: PMC5456499 DOI: 10.3390/ma9020095] [Citation(s) in RCA: 11] [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: 01/18/2016] [Revised: 01/27/2016] [Accepted: 02/01/2016] [Indexed: 01/12/2023]
Abstract
H2S plasma created by an electrode-less radio-frequency discharge was used to modify the surface properties of the polymer polyethylene terephthalate. X-ray photoelectron spectroscopy, secondary ion mass spectrometry and atomic force microscopy were used to determine the evolution of the surface functionalities and morphology. A very thin film of chemically bonded sulfur formed on the surface within the first 10 s of treatment, whereas treatment for more than 20 s caused deposition of higher quantities of unbonded sulfur. The sulfur concentration reached a maximum of between 40 and 80 s of plasma treatment; at longer treatment times, the unbonded sulfur vanished, indicating instability of the deposited sulfur layer. Large differences in the surface morphology were observed.
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Affiliation(s)
- Alenka Vesel
- Department of surface engineering, Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
| | - Janez Kovac
- Department of surface engineering, Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
| | - Gregor Primc
- Department of surface engineering, Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
| | - Ita Junkar
- Department of surface engineering, Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
| | - Miran Mozetic
- Department of surface engineering, Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia.
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Holc M, Junkar I, Primc G, Iskra J, Titan P, Mlakar SG, Kovac J, Mozetic M. Improved Sprout Emergence of Garlic Cloves by Plasma Treatment. Plasma Med 2016. [DOI: 10.1615/plasmamed.2016019133] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Oberkofler M, Alegre D, Aumayr F, Brezinsek S, Dittmar T, Dobes K, Douai D, Drenik A, Köppen M, Kruezi U, Linsmeier C, Lungu C, Meisl G, Mozetic M, Porosnicu C, Rohde V, Romanelli S. Plasma–wall interactions with nitrogen seeding in all-metal fusion devices: Formation of nitrides and ammonia. Fusion Engineering and Design 2015. [DOI: 10.1016/j.fusengdes.2015.01.044] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Recek N, Cheng X, Keidar M, Cvelbar U, Vesel A, Mozetic M, Sherman J. Effect of cold plasma on glial cell morphology studied by atomic force microscopy. PLoS One 2015; 10:e0119111. [PMID: 25803024 PMCID: PMC4372419 DOI: 10.1371/journal.pone.0119111] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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: 09/29/2014] [Accepted: 01/28/2015] [Indexed: 01/12/2023] Open
Abstract
The atomic force microscope (AFM) is broadly used to study the morphology of cells. The morphological characteristics and differences of the cell membrane between normal human astrocytes and glial tumor cells are not well explored. Following treatment with cold atmospheric plasma, evaluation of the selective effect of plasma on cell viability of tumor cells is poorly understood and requires further evaluation. Using AFM we imaged morphology of glial cells before and after cold atmospheric plasma treatment. To look more closely at the effect of plasma on cell membrane, high resolution imaging was used. We report the differences between normal human astrocytes and human glioblastoma cells by considering the membrane surface details. Our data, obtained for the first time on these cells using atomic force microscopy, argue for an architectural feature on the cell membrane, i.e. brush layers, different in normal human astrocytes as compared to glioblastoma cells. The brush layer disappears from the cell membrane surface of normal E6/E7 cells and is maintained in the glioblastoma U87 cells after plasma treatment.
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Affiliation(s)
- Nina Recek
- Department of Surface Engineering and Optoelectronics, Plasma laboratory, Institute Jozef Stefan, Ljubljana, Slovenia
- Jozef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Xiaoqian Cheng
- Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, D.C., United States of America
| | - Michael Keidar
- Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, D.C., United States of America
- Department of Neurosurgery, The George Washington University, Washington, D.C., United States of America
- * E-mail:
| | - Uros Cvelbar
- Department of Surface Engineering and Optoelectronics, Plasma laboratory, Institute Jozef Stefan, Ljubljana, Slovenia
| | - Alenka Vesel
- Department of Surface Engineering and Optoelectronics, Plasma laboratory, Institute Jozef Stefan, Ljubljana, Slovenia
| | - Miran Mozetic
- Department of Surface Engineering and Optoelectronics, Plasma laboratory, Institute Jozef Stefan, Ljubljana, Slovenia
| | - Jonathan Sherman
- Department of Neurosurgery, The George Washington University, Washington, D.C., United States of America
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Popelka A, Novak I, Lehocky M, Bilek F, Kleinova A, Mozetic M, Spirkova M, Chodak I. Antibacterial treatment of LDPE with halogen derivatives via cold plasma. EXPRESS POLYM LETT 2015. [DOI: 10.3144/expresspolymlett.2015.39] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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16
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Chirayil CJ, Mathew L, Hassan P, Mozetic M, Thomas S. Rheological behaviour of nanocellulose reinforced unsaturated polyester nanocomposites. Int J Biol Macromol 2014; 69:274-81. [DOI: 10.1016/j.ijbiomac.2014.05.055] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 05/15/2014] [Accepted: 05/16/2014] [Indexed: 11/26/2022]
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17
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Recek N, Mozetic M, Jaganjac M, Milkovic L, Zarkovic N, Vesel A. Adsorption of Proteins and Cell Adhesion to Plasma Treated Polymer Substrates. INT J POLYM MATER PO 2014. [DOI: 10.1080/00914037.2013.854243] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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18
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Vesel A, Kolar M, Stana-Kleinschek K, Mozetic M. Etching rates of blood proteins, blood plasma and polymer in oxygen afterglow of microwave plasma. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Alenka Vesel
- Plasma Laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
| | - Metod Kolar
- Jozef Stefan International Postgraduate School; Jamova 39 Ljubljana Slovenia
| | - Karin Stana-Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Miran Mozetic
- Plasma Laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
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Jaganjac M, Vesel A, Milkovic L, Recek N, Kolar M, Zarkovic N, Latiff A, Kleinschek KS, Mozetic M. Oxygen-rich coating promotes binding of proteins and endothelialization of polyethylene terephthalate polymers. J Biomed Mater Res A 2013; 102:2305-14. [DOI: 10.1002/jbm.a.34911] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 07/21/2013] [Accepted: 08/07/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Morana Jaganjac
- Toxicology and Multipurpose; Anti Doping Lab Qatar; Doha State of Qatar
- Divison Molecular Medicine; Rudjer Boskovic Institute; 10000 Zagreb Croatia
| | - Alenka Vesel
- Plasma Laboratory; Jozef Stefan Institute; 1000 Ljubljana Slovenia
| | - Lidija Milkovic
- Divison Molecular Medicine; Rudjer Boskovic Institute; 10000 Zagreb Croatia
| | - Nina Recek
- Plasma Laboratory; Jozef Stefan Institute; 1000 Ljubljana Slovenia
| | - Metod Kolar
- Faculty of Mechanical Engineering, University of Maribor; 2000 Maribor Slovenia
| | - Neven Zarkovic
- Divison Molecular Medicine; Rudjer Boskovic Institute; 10000 Zagreb Croatia
| | - Aishah Latiff
- Toxicology and Multipurpose; Anti Doping Lab Qatar; Doha State of Qatar
| | | | - Miran Mozetic
- Plasma Laboratory; Jozef Stefan Institute; 1000 Ljubljana Slovenia
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20
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Vesel A, Zaplotnik R, Mozetic M. Inductively coupled oxygen plasma in H mode for removal of carbon from mixed a-C:H, W films. Nuclear Engineering and Design 2013. [DOI: 10.1016/j.nucengdes.2013.01.021] [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: 10/27/2022]
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21
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Vesel A, Zaplotnik R, Iacono J, Balat-Pichelin M, Mozetic M. A catalytic sensor for measurement of radical density in CO2 plasmas. Sensors (Basel) 2012; 12:16168-81. [PMID: 23443372 PMCID: PMC3571776 DOI: 10.3390/s121216168] [Citation(s) in RCA: 5] [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: 10/10/2012] [Revised: 11/06/2012] [Accepted: 11/07/2012] [Indexed: 12/02/2022]
Abstract
A catalytic sensor for the measurement of radical density in weakly ionized CO2 plasmas, created in a low-pressure electrodeless discharge, is presented. The CO2 plasma was created in a 4 cm wide borosilicate glass tube inside a copper coil connected to a radio frequency generator operating at 27.12 MHz with a nominal power of 250 W. The dissociation fraction of the CO2 molecules was measured in the early afterglow at pressures ranging from 10 Pa to 100 Pa, and at distances of up to 35 cm along the gas stream from the glowing plasma. The radical density peaked (2 × 1020 m−3) at 80 Pa. The density quickly decreased with increasing distance from the glowing plasma despite a rather large drift velocity. The dissociation fraction showed similar behavior, except that the maximum was obtained at somewhat lower pressure. The results were explained by rather intense surface recombination of radicals.
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Affiliation(s)
- Alenka Vesel
- Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; E-Mails: (A.V.); (R.Z.)
| | - Rok Zaplotnik
- Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; E-Mails: (A.V.); (R.Z.)
| | - Jonathan Iacono
- PROMES-CNRS Laboratory, 7 rue du Four Solaire, 66120 Font-Romeu Odeillo, France; E-Mails: (J.I.); (M.B.P.)
| | - Marianne Balat-Pichelin
- PROMES-CNRS Laboratory, 7 rue du Four Solaire, 66120 Font-Romeu Odeillo, France; E-Mails: (J.I.); (M.B.P.)
| | - Miran Mozetic
- Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; E-Mails: (A.V.); (R.Z.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +386-1-477-3516; Fax: +386-1-477-3440
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22
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Vrlinic T, Debarnot D, Legeay G, Coudreuse A, El Moualij B, Zorzi W, Perret-Liaudet A, Quadrio I, Mozetic M, Poncin-Epaillard F. How to control the recombinant prion protein adhesion for successful storage through modification of surface properties. Biointerphases 2012; 7:66. [PMID: 23109107 DOI: 10.1007/s13758-012-0066-2] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 10/16/2012] [Indexed: 11/25/2022] Open
Abstract
Depletion of neuroproteins on the inner walls of storage tubes influences the accuracy of tests used for identification of various neurodegenerative disorders. In this paper, a strategy is described for surface modification of Eppendorf tubes leading to non-adhesive properties towards the recombinant human prion proteins (PrPrec(hum)). Tubes were pre-activated by helium plasma and grafted with three diverse coatings: pure poly(N-isopropylacrylamide) (PNIPAM), PNIPAM admixed with either neutral PEG(20)sorbitan monolaurate (PEG(20)) or positively charged cetyl trimethylammonium bromide (CTAB) at varying plasma activation times and polymer to surfactant ratios. New functionalized surfaces were analyzed by goniometry, streaming potential measurement and X-ray photoelectron spectroscopy, whereas the protein adhesion was monitored by enzyme linked immunosorbent assays and confocal microscopy. The mapping of PrPrec(hum) adhesion associated with surface analyses enabled us to determine that no or negligible depletion of PrPrec(hum) can be obtained by surfaces possessing basic component in the range between 50 and 60 mJ m(-2) and streaming potential ζ(7.4) - -50 mV.
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Affiliation(s)
- T Vrlinic
- Département Polymères Colloïdes et Interfaces, Institut des Molécules et Matériaux du Mans, LUNAM Université, UMR Université du Maine, CNRS n° 6283, Avenue Olivier Messiaen, 72085 Le Mans Cedex, France
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Vrlinic T, Debarnot D, Legeay G, Coudreuse A, El Moualij B, Zorzi W, Perret-Liaudet A, Quadrio I, Mozetic M, Poncin-Epaillard F. Non-Adhesive Behavior of New Nanostructured PNIPAM Surfaces Towards Specific Neurodegenerative Proteins: Application to Storage and Titration of Tau Proteins. Macromol Biosci 2012; 12:1354-63. [DOI: 10.1002/mabi.201200116] [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] [Received: 04/04/2012] [Revised: 06/07/2012] [Indexed: 11/08/2022]
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24
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Vesel A, Kolar M, Doliska A, Stana-Kleinschek K, Mozetic M. Etching of polyethylene terephthalate thin films by neutral oxygen atoms in the late flowing afterglow of oxygen plasma. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.5064] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alenka Vesel
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
| | - Metod Kolar
- Jozef Stefan International Postgraduate School; Jamova 39 Ljubljana Slovenia
| | - Ales Doliska
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Karin Stana-Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Miran Mozetic
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
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Vrlinic T, Debarnot D, Legeay G, Coudreuse A, El Moualij B, Zorzi W, Perret-Liaudet A, Quadrio I, Mozetic M, Poncin-Epaillard F. Are the interactions between recombinant prion proteins and polymeric surfaces related to the hydrophilic/hydrophobic balance? Macromol Biosci 2012; 12:830-9. [PMID: 22508476 DOI: 10.1002/mabi.201100454] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 01/14/2012] [Indexed: 11/06/2022]
Abstract
New non-fouling tubes are developed and their influence on the adhesion of neuroproteins is studied. Recombinant prion proteins are considered as a single component representative of hydrophobic proteins. Samples are stored for 24 h at 4 °C in tubes coated with two different coatings: poly(N-isopropylacrylamide) as a hydrophilic surface and a plasma-fluorinated coating as a hydrophobic one. The protein adhesion is monitored by ELISA tests, XPS and confocal microscopy. It appears that the highest recovery of recombinant prion protein in the liquid phase is obtained with the hydrophilic surface while the hydrophobic character of the storage tube induces an important amount of biological loss. However, the recovery is not complete even for tubes coated with poly(N-isopropylacrylamide).
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Affiliation(s)
- Tjasa Vrlinic
- LUNAM Université, UMR Université du Maine-CNRS n° 6283, Institut des Molécules et Matériaux du Mans-Département, Av. O. Messiaen, 72085 Le Mans, France
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26
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Sedlarik V, Otgonzul O, Kitano T, Gregorova A, Hrabalova M, Junkar I, Cvelbar U, Mozetic M, Saha P. Effect of Phase Arrangement on Solid State Mechanical and Thermal Properties of Polyamide 6/Polylactide Based Co-polyester Blends. J MACROMOL SCI B 2011. [DOI: 10.1080/00222348.2011.610265] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Vladimir Sedlarik
- a Centre of Polymer Systems , Polymer Centre, Tomas Bata University in Zlin , Zlin , Czech Republic
| | - Onon Otgonzul
- a Centre of Polymer Systems , Polymer Centre, Tomas Bata University in Zlin , Zlin , Czech Republic
| | - Takeshi Kitano
- a Centre of Polymer Systems , Polymer Centre, Tomas Bata University in Zlin , Zlin , Czech Republic
| | - Adriana Gregorova
- b Institute for Chemistry and Technology of Materials , Graz University of Technology , Graz , Austria
| | - Marta Hrabalova
- c Institute for Natural Materials Technology, IFA-Tulln , University of Natural Resources and Applied Life Sciences , Tulln , Austria
| | - Ita Junkar
- d Jozef Stefan Institute , Ljubljana , Slovenia
| | | | | | - Petr Saha
- a Centre of Polymer Systems , Polymer Centre, Tomas Bata University in Zlin , Zlin , Czech Republic
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Vrlinic T, Debarnot D, Mozetic M, Vesel A, Kovac J, Coudreuse A, Legeay G, Poncin-Epaillard F. Elaboration of nano-structured grafted polymeric surface. J Colloid Interface Sci 2011; 362:300-10. [PMID: 21784430 DOI: 10.1016/j.jcis.2011.06.057] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 06/14/2011] [Accepted: 06/23/2011] [Indexed: 11/18/2022]
Abstract
The surface grafting of multi-polymeric materials can be achieved by grafting as components such as polymers poly(N-isopropylacrylamide) and/or surfactant molecules (hexatrimethylammonium bromide, polyoxyethylene sorbitan monolaurate). The chosen grafting techniques, i.e. plasma activation followed by coating, allow a large spectrum of functional groups that can be inserted on the surface controlling the surface properties like adhesion, wettability and biocompatibility. The grafted polypropylene surfaces were characterized by contact angle analyses, XPS and AFM analyses. The influence of He plasma activation, of the coating parameters such as concentrations of the various reactive agents are discussed in terms of hydrophilic character, chemical composition and morphologic surface heterogeneity. The plasma pre-activation was shown inevitable for a permanent polymeric grafting. PNIPAM was grafted alone or with a mixture of the surfactant molecules. Depending on the individual proportion of each component, the grafted surfaces are shown homogeneous or composed of small domains of one component leading to a nano-structuration of the grafted surface.
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Affiliation(s)
- Tjasa Vrlinic
- LUNAM Université, Laboratoire Polymères, Colloïdes et Interfaces, UMR CNRS 6120 - Université du Maine, av. O. Messiaen, 72085 Le Mans, France
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Tabarés FL, Ferreira JA, Ramos A, van Rooij G, Westerhout J, Al R, Rapp J, Drenik A, Mozetic M. Suppression of tritium retention in remote areas of ITER by nonperturbative reactive gas injection. Phys Rev Lett 2010; 105:175006. [PMID: 21231056 DOI: 10.1103/physrevlett.105.175006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2010] [Indexed: 05/30/2023]
Abstract
A technique based on reactive gas injection in the afterglow region of the divertor plasma is proposed for the suppression of tritium-carbon codeposits in remote areas of ITER when operated with carbon-based divertor targets. Experiments in a divertor simulator plasma device indicate that a 4 nm/min deposition can be suppressed by addition of 1 Pa·m³ s⁻¹ ammonia flow at 10 cm from the plasma. These results bolster the concept of nonperturbative scavenger injection for tritium inventory control in carbon-based fusion plasma devices, thus paving the way for ITER operation in the active phase under a carbon-dominated, plasma facing component background.
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Ostrikov KK, Levchenko I, Cvelbar U, Sunkara M, Mozetic M. From nucleation to nanowires: a single-step process in reactive plasmas. Nanoscale 2010; 2:2012-27. [PMID: 20721365 DOI: 10.1039/c0nr00366b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This feature article introduces a deterministic approach for the rapid, single-step, direct synthesis of metal oxide nanowires. This approach is based on the exposure of thin metal samples to reactive oxygen plasmas and does not require any intervening processing or external substrate heating. The critical roles of the reactive oxygen plasmas, surface processes, and plasma-surface interactions that enable this growth are critically examined by using a deterministic viewpoint. The essentials of the experimental procedures and reactor design are presented and related to the key process requirements. The nucleation and growth kinetics is discussed for typical solid-liquid-solid and vapor-solid-solid mechanisms related to the synthesis of the oxide nanowires of metals with low (Ga, Cd) and high (Fe) melting points, respectively. Numerical simulations are focused on the possibility to predict the nanowire nucleation points through the interaction of the plasma radicals and ions with the nanoscale morphological features on the surface, as well as to control the localized 'hot spots' that in turn determine the nanowire size and shape. This generic approach can be applied to virtually any oxide nanoscale system and further confirms the applicability of the plasma nanoscience approaches for deterministic nanoscale synthesis and processing.
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Affiliation(s)
- Kostya Ken Ostrikov
- Plasma Nanoscience Centre Australia, CSIRO Materials Science and Engineering, PO Box 218, Lindfield, NSW 2070, Australia.
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Arulsamy AD, Cvelbar U, Mozetic M, Ostrikov KK. Non-square-well potential profile and suppression of blinking in compositionally graded Cd(1-x)Zn(x)Se/Cd(x)Zn(1-x)Se nanocrystals. Nanoscale 2010; 2:728-733. [PMID: 20648317 DOI: 10.1039/b9nr00322c] [Citation(s) in RCA: 4] [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: 05/29/2023]
Abstract
Random blinking is a major problem on the way to successful applications of semiconducting nanocrystals in optoelectronics and photonics, which until recently had neither a practical solution nor a theoretical interpretation. An experimental breakthrough has recently been made by fabricating non-blinking Cd(1-x)Zn(x)Se/ZnSe graded nanocrystals [Wang et al., Nature, 2009, 459, 686]. Here, we (1) report an unequivocal and detailed theoretical investigation to understand the properties (e.g., profile) of the potential-well and the distribution of Zn content with respect to the nanocrystal radius and (2) develop a strategy to find the relationship between the photoluminescence (PL) energy peaks and the potential-well due to Zn distribution in nanocrystals. It is demonstrated that the non-square-well potential can be varied in such a way that one can indeed control the PL intensity and the energy-level difference (PL energy peaks) accurately. This implies that one can either suppress the blinking altogether, or alternatively, manipulate the PL energy peaks and intensities systematically to achieve a controlled non-random intermittent luminescence. The approach developed here is based on the ionization energy approximation and as such is generic and can be applied to any non-free-electron nanocrystals.
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Affiliation(s)
- Andrew Das Arulsamy
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia.
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31
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Vesel A, Drenik A, Zaplotnik R, Mozetic M, Balat-Pichelin M. Reduction of thin oxide films on tungsten substrate with highly reactive cold hydrogen plasma. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3185] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Junkar I, Sustar V, Frank M, Jansa V, Zavec AB, Rozman B, Mozetic M, Hagerstrand H, Kralj-Iglic V. Blood and Synovial Microparticles as Revealed by Atomic Force and Scanning Electron Microscope. ACTA ACUST UNITED AC 2009. [DOI: 10.2174/1876894600901010050] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [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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34
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Vesel A, Junkar I, Cvelbar U, Kovac J, Mozetic M. Surface modification of polyester by oxygen- and nitrogen-plasma treatment. SURF INTERFACE ANAL 2008. [DOI: 10.1002/sia.2923] [Citation(s) in RCA: 220] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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35
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Cvelbar U, Ostrikov KK, Mozetic M. Reactive oxygen plasma-enabled synthesis of nanostructured CdO: tailoring nanostructures through plasma-surface interactions. Nanotechnology 2008; 19:405605. [PMID: 21832625 DOI: 10.1088/0957-4484/19/40/405605] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Plasma-assisted synthesis of nanostructures is one of the most precise and effective approaches used in nanodevice fabrication. Here we report on the innovative approach of synthesizing nanostructured cadmium oxide films on Cd substrates using a reactive oxygen plasma-based process. Under certain conditions, the surface morphology features arrays of crystalline CdO nano/micropyramids. These nanostructures grow via unconventional plasma-assisted oxidation of a cadmium foil exposed to inductively coupled plasmas with a narrow range of process parameters. The growth of the CdO pyramidal nanostructures takes place in the solid-liquid-solid phase, with the rates determined by the interaction of plasma-produced oxygen atoms and ions with the surface. It is shown that the size of the pyramidal structures can be effectively controlled by the fluxes of oxygen atoms and ions impinging on the cadmium surface. The unique role of the reactive plasma environment in the controlled synthesis of CdO nanopyramidal structures is discussed as well.
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Affiliation(s)
- Uroš Cvelbar
- Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
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36
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Cvelbar U, Chen Z, Sunkara MK, Mozetic M. Spontaneous growth of superstructure alpha-Fe2O3 nanowire and nanobelt arrays in reactive oxygen plasma. Small 2008; 4:1610-1614. [PMID: 18770506 DOI: 10.1002/smll.200800278] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Uros Cvelbar
- JoZef Stefan Institute, Jamova cesta 39, Ljubljana, SI-1000, Slovenia
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Mozetic M, Zalar A, Cvelbar U, Babic D. AES characterization of thin oxide films growing on Al foil during oxygen plasma treatment. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.1818] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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40
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Kunaver M, Klanjsek-Gunde M, Mozetic M, Kunaver M, Hrovat A. The degree of dispersion of pigments in powder coatings and the origin of some surface defects. ACTA ACUST UNITED AC 2003. [DOI: 10.1007/bf02699650] [Citation(s) in RCA: 11] [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: 11/28/2022]
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41
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Arcon I, Mozetic M, Kodre A, Jagielski J, Traverse A. EXAFS study of NiAl in thin films. J Synchrotron Radiat 2001; 8:493-495. [PMID: 11512827 DOI: 10.1107/s0909049500016642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Accepted: 11/08/2000] [Indexed: 05/23/2023]
Abstract
Technologically important coatings of transition-metal aluminides call be produced by thermal or ion beam mixing of multilayer structures sputter deposited on substrates. The quantitative detection of constituents by depth profiling is sufficient to establish the efficiency of mixing methods. However, to decide whether a mixture of nanoparticles or a stoichiometric alloy is formed, EXAFS analysis of the local atomic neighborhood in the film is required. Ni K edge EXAFS spectra are measured on a series of samples of Ni/Al multilayer on Si(111) surface, after ion mixing at different substrate temperatures. The spectra show that with increasing temperature the nickel aluminide phase gradually substitutes the Ni fcc metal phase.
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Affiliation(s)
- I Arcon
- Nova Gorica Polytechnic, Slovenia.
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Cizman M, Mozetic M, Radescek-Rakar R, Pleterski-Rigler D, Susec-Michieli M. Aseptic meningitis after vaccination against measles and mumps. Pediatr Infect Dis J 1989; 8:302-8. [PMID: 2726323] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This retrospective study (1979 to 1986) investigated the possible etiologic relationship between vaccination and aseptic meningitis in 115 hospitalized children who became ill within 30 days of vaccination with the Leningrad 3 strain of mumps virus and the Edmonston-Zagreb strain of measles virus. The etiologic viral diagnosis was based on serologic tests and the isolation of virus from cell cultures which distinguished between attenuated and "virulent" mumps virus. The incidence of mumps vaccine-associated meningitis was 1/1000 vaccine recipients. In 92% of children the incubation period was 11 to 25 days and 28% had associated swelling of the salivary glands. Sixteen cases (13.9%) had a positive cerebrospinal fluid culture (attenuated mumps virus, 6 cases; "virulent" mumps virus, 7 cases; echoviruses, 3 cases). Clustering of cases, seasonal occurrence and age of the patients suggested causal relationship with the vaccination in the majority of children. In 4 patients with attenuated virus isolation from cerebrospinal fluid the incubation period ranged from 17 to 20 days. Clinical findings did not differ from natural mumps meningitis. The course was uncomplicated and at discharge the patients had no sequelae. Measles virus was never found as a cause of the meningitis. The mumps vaccine virus should be recognized as one of the causative agents of aseptic meningitis in countries where less attenuated mumps vaccine is used.
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Affiliation(s)
- M Cizman
- Department of Infectious Diseases, University Medical Center, Ljubljana, Yugoslavia
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Petricević I, Borcić D, Sekula I, Bacun-Kubović M, Mozetic M. [Study on the etiology of febrile conditions during an epidemic in the year 1969]. Lijec Vjesn 1972; 99:389-402. [PMID: 4657163] [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: 01/11/2023]
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