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Yamaki, Tetsuya*; Kitamura, Akane; Sawada, Shinichi*; Koshikawa, Hiroshi*
Nihon Kaisui Gakkai-Shi, 72(2), p.62 - 74, 2018/04
This review paper is devoted to two topics, i.e., fluoropolymer-based porous and ion-exchange membranes, both of which include the creation of nanostructure-controlled functional membranes with high-energy ion beams. Latent tracks of the MeV-GeV heavy ions in a polymer foil can sometimes be chemically etched out to form a membrane with micro- and nano-sized through-pores, the so-called ion-track membrane. Our focus is on ion-track membranes of poly (vinylidene fluoride) (PVDF) and cation- and anion-exchange membranes (CEMs and AEMs, respectively).
Ichinose, Yuji; Kawanishi, Shunichi
Langmuir, 13(22), p.5805 - 5807, 1997/00
Times Cited Count：5 Percentile：76.07(Chemistry, Multidisciplinary)no abstracts in English
Kawanishi, Shunichi; Ichinose, Yuji
Reza Kenkyu, 24(7), p.780 - 786, 1996/07
no abstracts in English
Ichinose, Yuji; Kawanishi, Shunichi
Macromolecules, 29, p.4155 - 4157, 1996/00
Times Cited Count：10 Percentile：44.72(Polymer Science)no abstracts in English
*; Ichinose, Yuji; Kawanishi, Shunichi
Kobunshi Rombunshu, 52(1), p.66 - 68, 1995/01
Times Cited Count：3 Percentile：25.14(Polymer Science)no abstracts in English
Ichinose, Yuji; *; Kawanishi, Shunichi; *; *
Chemistry Letters, 0(10), p.943 - 944, 1995/00
no abstracts in English
Yamaki, Tetsuya
no journal, ,
My talk is devoted to the following two topics, both of which include the creation of fluoropolymer-based nanostructures with swift heavy ions mainly from the cyclotron of the Takasaki Ion Accelerators for Advanced Radiation Application. (1) We have prepared the ion-track membranes of poly(vinylidene fluoride) (PVDF), a type of fluoropolymer, by etching out latent tracks of MeV-GeV heavy ions in an alkaline solution. (2) The electrolyte membranes for fuel cell applications have been prepared by the direct grafting of a styrene monomer into the ion tracks in a fluoropolymer substrate, poly(ethylene-co-tetrafluoroethylene) (ETFE) film.
Yamaki, Tetsuya
no journal, ,
We have realized the importance of developing micro/nanofabrication techniques for fluoropolymers in order to further pursue the potential for their future applications. My talk is devoted to our recent research activities on (1) ion-track membranes of poly(vinylidene fluoride) (PVDF) and (2) proton-conductive membranes prepared by ion-track grafting into poly(ethylene-co-tetrafluoroethylene) (ETFE) films. Both of them include the creation of fluoropolymer-based nanostructures with swift heavy ions mainly from the cyclotron of the Takasaki Ion Accelerators for Advanced Radiation Application (TIARA), JAEA.
Yamaki, Tetsuya; Nuryanthi, N.*; Koshikawa, Hiroshi; Asano, Masaharu*; Sawada, Shinichi; Kitamura, Akane; Maekawa, Yasunari; Kay-Obbe, V.*; Severin, D.*; Seidl, T.*; et al.
no journal, ,
Practically, polyvinylidene fluoride (PVDF) has been said to be the only fluoropolymer in which ion tracks can be developed by chemical etching. We thus investigated the possibility of varying the beam parameters and applying the effect of a pre-etching treatment for PVDF ion-track membranes with the goal of achieving enhanced track etching for effective control of the pore size and shape. Our activities also cover all types of fluoropolymers including PVDF. Compared to PVDF, poly(ethylene-
-tetrafluoroethylene) and a series of perfluoropolymers are known to be very stable in highly-concentrated acid or alkaline solutions or at higher temperatures. Although this property might make their ion-track etching very challenging, the ongoing research is expected to allow one to accumulate know-how on methods of chemical etching, which can be generalized for the chemical structures. These will give feedback to a guiding principle for effective ion-track etching in fluoropolymers.
Kitamura, Akane; Yamaki, Tetsuya*; Yuri, Yosuke*; Koshikawa, Hiroshi*; Sawada, Shinichi*; Yuyama, Takahiro*
no journal, ,
Ion track membranes of polyvinylidene fluoride (PVDF) are produced by chemical etching using a strong oxidant in an alkali solution after irradiation with an ion beam in vacuum. The oxidant erodes not only ion tracks but also a pristine surface of PVDF. Therefore, it causes serious deterioration in the quality of PVDF membranes. We have developed a track etching technique without any oxidant by irradiation with an ion beam in an oxygen atmosphere. PVDF films were irradiated with 330-MeV Ar ions in an oxygen atmosphere using a uniform-beam formation/irradiation system developed at the TIARA AVF-cyclotron facility. The maximum etching rate resulting from the present method was six times faster than that from the conventional method; furthermore, the maximum diameter of track-etched pores with the present method was more than twice as large as that in the conventional method. This suggests that the irradiation in oxygen can provide a useful technique of an oxidant-free track-etching process.
Kitamura, Akane; Yamaki, Tetsuya*; Yuri, Yosuke*; Koshikawa, Hiroshi*; Sawada, Shinichi*; Yuyama, Takahiro*
no journal, ,
Ion track membranes of polyvinylidene fluoride (PVDF) are produced by chemical etching using a strong oxidant in an alkali solution after irradiation with an ion beam in vacuum. The oxidant erodes not only ion tracks but also a pristine surface of PVDF. Therefore, it causes serious deterioration in the quality of PVDF membranes. We have developed a track etching technique without any oxidant by irradiation with an ion beam in an oxygen atmosphere. PVDF films were irradiated with 330-MeV Ar ions in an oxygen atmosphere using a uniform-beam formation/irradiation system developed at the AVF-cyclotron of the TIARA facility. The maximum etching rate was six times faster than that from the conventional method; furthermore, the maximum diameter of track-etched pores was more than twice as large as that in the conventional method. FT-IR results showed that more oxygen-containing functional groups were formed on the surface irradiated in an oxygen atmosphere. Those were both caused by oxidation of ion tracks and the oxidation of ion tracks widened the size of etchable ion tracks. This suggests that the irradiation in oxygen can provide a useful technique of an oxidant-free track-etching process.
Fujikawa, Hisaharu*; Arai, Yoichi; Watanabe, So; Fukumoto, Hiroki*; Ago, Tomohiro*
no journal, ,
no abstracts in English
