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Navascués P, Schütz U, Hanselmann B, Hegemann D. Near-Plasma Chemical Surface Engineering. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:195. [PMID: 38251159 PMCID: PMC10819024 DOI: 10.3390/nano14020195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/23/2024]
Abstract
As a new trend in plasma surface engineering, plasma conditions that allow more-defined chemical reactions at the surface are being increasingly investigated. This is achieved by avoiding high energy deposition via ion bombardment during direct plasma exposure (DPE) causing destruction, densification, and a broad variety of chemical reactions. In this work, a novel approach is introduced by placing a polymer mesh with large open area close to the plasma-sheath boundary above the plasma-treated sample, thus enabling near-plasma chemistry (NPC). The mesh size effectively extracts ions, while reactive neutrals, electrons, and photons still reach the sample surface. The beneficial impact of this on the plasma activation of poly (tetrafluoroethylene) (PTFE) to enhance wettability and on the plasma polymerization of siloxanes, combined with the etching of residual hydrocarbons to obtain highly porous SiOx coatings at low temperatures, is discussed. Characterization of the treated samples indicates a predominant chemical modification yielding enhanced film structures and durability.
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Affiliation(s)
- Paula Navascués
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | | | | | - Dirk Hegemann
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
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2
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Ohkubo Y, Okazaki Y, Nishino M, Seto Y, Endo K, Yamamura K. Flexible selection of the functional-group ratio on a polytetrafluoroethylene (PTFE) surface using a single-gas plasma treatment. RSC Adv 2022; 12:31246-31254. [PMID: 36349015 PMCID: PMC9623557 DOI: 10.1039/d2ra04763b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 10/21/2022] [Indexed: 09/07/2024] Open
Abstract
During plasma treatment of polymers, etching occurs and functional groups are introduced on their surface. We assumed that controlling the etching rate would enable plasma treatment using a single gas to control the ratio of functional groups generated on a polymer's surface, although previous studies have indicated that several different types of functional groups are formed when the gaseous species are varied. In this study, we selected the base pressure (BP) as a parameter for controlling the etching rate and subjected polytetrafluoroethylene (PTFE) to plasma treatments using only He gas at various BPs. The chemical composition of the surface of the plasma-treated PTFE samples was evaluated by X-ray photoelectron spectroscopy (XPS), and the ratios of fluorine (CF3, CF2, C-F), oxygen (O-C[double bond, length as m-dash]O, C[double bond, length as m-dash]O, C-O), and carbon (C-C, C[double bond, length as m-dash]C) groups were quantified from the C 1s-XPS spectra. The fluorine-group ratio decreased and the oxygen- and carbon-group ratios increased with decreasing BP. The results demonstrated that plasma treatment using a single gas enabled flexible selection of the ratio of functional groups generated on PTFE via control of the BP.
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Affiliation(s)
- Yuji Ohkubo
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Yuki Okazaki
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Misa Nishino
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Yosuke Seto
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Katsuyoshi Endo
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Kazuya Yamamura
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
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Nishino M, Okazaki Y, Seto Y, Uehara T, Endo K, Yamamura K, Ohkubo Y. Adhesive-Free Adhesion between Plasma-Treated Glass-Cloth-Containing Polytetrafluoroethylene (GC-PTFE) and Stainless Steel: Comparison between GC-PTFE and Pure PTFE. Polymers (Basel) 2022; 14:394. [PMID: 35160384 PMCID: PMC8838903 DOI: 10.3390/polym14030394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 01/11/2022] [Accepted: 01/17/2022] [Indexed: 01/27/2023] Open
Abstract
In this study, the effect of plasma treatment on glass-cloth-containing polytetrafluoroethylene (GC-PTFE) was investigated. Previous plasma studies investigated pure PTFE (which does not contain glass cloth) but not GC-PTFE. The effect of Ar + H2O plasma treatment on GC-PTFE was investigated. The Ar + H2O plasma-treated GC-PTFE sheets were thermally compressed to stainless steel (SUS304) foils without using adhesive, and the GC-PTFE/SUS304 adhesion strengths were measured using a 90° peel test. The adhesion strength increased with the increase in the plasma treatment time (0.8 and 1.0 N/mm at 20 s and 300 s, respectively). Thus, strong adhesion between GC-PTFE/SUS304 was achieved without adhesive. This improvement in the adhesion properties of GC-PTFE can be attributed to the generation of oxygen-containing functional groups and the decrease in the surface roughness of the samples. Thereafter, the adhesion properties of GC-PTFE and pure PTFE were compared. Because, unlike pure PTFE, GC-PTFE has no weak boundary layer, GC-PTFE exhibited better adhesion properties than pure PTFE under short plasma treatment times.
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Affiliation(s)
- Misa Nishino
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; (M.N.); (Y.O.); (Y.S.); (K.E.); (K.Y.)
| | - Yuki Okazaki
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; (M.N.); (Y.O.); (Y.S.); (K.E.); (K.Y.)
| | - Yosuke Seto
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; (M.N.); (Y.O.); (Y.S.); (K.E.); (K.Y.)
| | - Tsuyoshi Uehara
- SEKISUI CHEMICAL Co., Ltd., 2-2 Kamichoshi-cho, Kamitoba, Minami-ku, Kyoto 601-8105, Japan;
| | - Katsuyoshi Endo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; (M.N.); (Y.O.); (Y.S.); (K.E.); (K.Y.)
| | - Kazuya Yamamura
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; (M.N.); (Y.O.); (Y.S.); (K.E.); (K.Y.)
| | - Yuji Ohkubo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; (M.N.); (Y.O.); (Y.S.); (K.E.); (K.Y.)
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KAMEDA T, SATO H, OKA S, MIYAZAKI A, OHKUMA K, TERADA K. Low temperature polytetrafluoroethylene (PTFE) coating improves the appearance of orthodontic wires without changing their mechanical properties. Dent Mater J 2020; 39:721-734. [DOI: 10.4012/dmj.2019-227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Takashi KAMEDA
- Department of Orthodontics, Nippon Dental University School of Life Dentistry at Niigata
| | | | - Shunya OKA
- Department of Biology, Nippon Dental University School of Life Dentistry at Niigata
| | | | - Kazuo OHKUMA
- Department of Dental Materials Science, Nippon Dental University School of Life Dentistry at Niigata
| | - Kazuto TERADA
- Orthodontic Dentistry, Nippon Dental University Niigata Hospital
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OHTA S, SHIBA S, YAJIMA T, NIWA O. Plasma-Treated Sputtered Nanocarbon Film Electrodes for Suppressing Electrochemical Fouling by Serotonin. ELECTROCHEMISTRY 2020. [DOI: 10.5796/electrochemistry.20-64072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Saki OHTA
- Department of Life Science and Green Chemistry, Graduate School of Engineering, Saitama Institute of Technology
| | - Shunsuke SHIBA
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
| | - Tatsuhiko YAJIMA
- Department of Life Science and Green Chemistry, Graduate School of Engineering, Saitama Institute of Technology
| | - Osamu NIWA
- Department of Life Science and Green Chemistry, Graduate School of Engineering, Saitama Institute of Technology
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Ohta S, Shiba S, Yajima T, Kamata T, Kato D, Niwa O. Gas-phase Treatment Methods for Chemical Termination of Sputtered Nanocarbon Film Electrodes to Suppress Surface Fouling by Proteins. J PHOTOPOLYM SCI TEC 2019. [DOI: 10.2494/photopolymer.32.523] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Saki Ohta
- Advanced Science Research Laboratory, Saitama Institute of Technology
| | - Shunsuke Shiba
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
| | - Tatsuhiko Yajima
- Advanced Science Research Laboratory, Saitama Institute of Technology
| | - Tomoyuki Kamata
- National Institute of Advanced Industrial Science and Technology
| | - Dai Kato
- National Institute of Advanced Industrial Science and Technology
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology
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Kameda T, Ohkuma K, Oka S. Polytetrafluoroethylene (PTFE): A resin material for possible use in dental prostheses and devices. Dent Mater J 2019; 38:136-142. [PMID: 30381638 DOI: 10.4012/dmj.2018-088] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Polytetrafluoroethylene (PTFE) is chemically stable, non-toxic to humans, highly resistant to heat and chemicals, and has an extremely low coefficient of friction. Therefore, PTFE is used in medical applications. We focused on the physical properties of PTFE in relation to its application as a material for use in prostheses and dental devices/instruments. PTFE exhibited low wear (approximately 1/3 that of bovine tooth, and 1/2 that of type III gold alloy), low dynamic friction (approximately 1/5 that of the other specimens), low hardness (4.8HV1.0), low coloration, and low bacterial adhesion, compared to other specimens except porcelain in wear and coloration test (p<0.01). These results suggest that PTFE could have applications in some prostheses for provisional and/or permanent use, and dental instruments/devices by providing excellent impact absorption, high wear resistance for maintenance of occlusal vertical dimension and original function, and ease of cleaning.
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Affiliation(s)
- Takashi Kameda
- Department of Orthodontics, Nippon Dental University School of Life Dentistry at Niigata
| | - Kazuo Ohkuma
- Department of Dental Materials Science, Nippon Dental University School of Life Dentistry at Niigata
| | - Shunya Oka
- Department of Biology, Nippon Dental University School of Life Dentistry at Niigata
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Nagatsu M, Sugiyama K, Motrescu I, Ciolan MA, Ogino A, Kawamura N. Surface Modification of Fluorine Contained Resins using an Elongated Parallel Plate Electrode Type Dielectric Barrier Discharge Device. J PHOTOPOLYM SCI TEC 2018. [DOI: 10.2494/photopolymer.31.379] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Masaaki Nagatsu
- Research Institute of Electronics, Shizuoka University
- Graduate School of Integrated Science and Technology, Shizuoka University
| | - Kazuya Sugiyama
- Graduate School of Integrated Science and Technology, Shizuoka University
| | - Iuliana Motrescu
- Research Institute of Electronics, Shizuoka University
- Science Department & Research Institute for Agriculture and Environment, University of Agricultural Sciences and Veterinary Medicine of Iasi
| | | | - Akihisa Ogino
- Graduate School of Integrated Science and Technology, Shizuoka University
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Zhang Y, Cattrall RW, Kolev SD. Fast and Environmentally Friendly Microfluidic Technique for the Fabrication of Polymer Microspheres. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14691-14698. [PMID: 29227109 DOI: 10.1021/acs.langmuir.7b03574] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This paper reports on a novel microfluidic technique for the fabrication of microspheres of synthetic polymers including poly(vinyl chloride) (PVC), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), poly(lactic acid) (PLA), and polystyrene (PS). The polymers are dissolved in tetrahydrofuran (THF) and the method is based on the diminished solubility of THF in a 20% (w/v) NaCl solution which allows the formation of droplets of the polymer solution. These polymer solution droplets are generated in a microfluidic system and their desolvation is accomplished within seconds by allowing the droplets to rise by buoyancy through a NaCl solution with a concentration lower than 15%. The size and morphology of the resultant polymer microspheres have been investigated by optical and scanning electron microscopy. Apart from the elimination of the use of highly toxic solvents as in conventional methods for manufacturing of polymer microspheres, the newly developed technique has the advantages of providing faster desolvation of the polymer solution droplets and a higher yield of microspheres compared to emulsification-based techniques.
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Affiliation(s)
- Yanlin Zhang
- School of Chemistry, The University of Melbourne , Victoria 3010, Australia
| | - Robert W Cattrall
- School of Chemistry, The University of Melbourne , Victoria 3010, Australia
| | - Spas D Kolev
- School of Chemistry, The University of Melbourne , Victoria 3010, Australia
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Nguyen HD, Yajima T. A Spectroscopic Study on Argon-Ammonia Water Gaseous Plasma Super-hydrophilizing Polytetrafluoroethylene. J PHOTOPOLYM SCI TEC 2017. [DOI: 10.2494/photopolymer.30.325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hai Dang Nguyen
- Department of Applied Chemistry, Graduate School of Engineering
| | - Tatsuhiko Yajima
- Department of Applied Chemistry, Graduate School of Engineering
- Department of Life Science and Green Chemistry, Faculty of Engineering, Saitama Institute of Technology
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11
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Nagatsu M, Kimpara M, Hu R, Abuzairi T. Surface Modification of Fluorine-containing Polymers by Atmospheric Pressure Plasma Jet with Negative Substrate Biasing. J PHOTOPOLYM SCI TEC 2017. [DOI: 10.2494/photopolymer.30.307] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Masaaki Nagatsu
- Research Institute of Electronics, Shizuoka University
- Graduate School of Integrated Science and Technology, Shizuoka University
- Graduate School of Science and Technology, Shizuoka University
| | - Masahiro Kimpara
- Graduate School of Integrated Science and Technology, Shizuoka University
| | - Rui Hu
- Graduate School of Science and Technology, Shizuoka University
- Institute of Plasma Physics, Chinese Academy of Sciences
| | - Tomy Abuzairi
- Department of Electrical Engineering, University of Indonesia
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