Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Yamaki, Tetsuya; Kozone, Yuichi*; Hiroki, Akihiro; Hosoi, Katsuhiko*; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 75(2), p.175 - 178, 2007/02
Times Cited Count：12 Percentile：26.13(Electrochemistry)Proton exchange membranes for use in fuel cells were prepared our original ion-track technology, which involves (1) the swift heavy ion irradiation of polyvinylidene fluoride films and subsequent chemical etching to obtain cylindrical pores, and (2) the filling of proton-conducting polymer chains into the etched pores by 
-ray-induced graft polymerization. We found that the membranes possessed one-dimensional straight proton conducting pathways parallel to the ion-beam incident axis. Such restricted structures probably led to less water uptake and lower methanol permeability compared to a commercially-available Nafion membrane.
Yamaki, Tetsuya; Kozone, Yuichi; Hiroki, Akihiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
ECS Transactions, 3(1), p.103 - 112, 2006/00
Fluoropolymer-based electrolyte membranes for water electrolyzers and fuel cells were prepared by using heavy ion beams from the cyclotron accelerator. The preparation method for these so-called "nano-scale structure-controlled membranes" involves (1) the swift heavy ion irradiation of polyvinylidene fluoride films and subsequent chemical etching to obtain cylindrical pores with a diameter of 100 nm, and (2) the filling of proton-conducting polymer chains into the etched pores by -ray-induced graft polymerization. The proton transport only in the thickness direction was observed for the resulting membranes with controlled ion exchange capacities, indicating the formation of one-dimensional straight proton-conducting pathways parallel to the ion-beam incident axis. The membranes exhibited a lower water uptake and reduced methanol permeability compared to commercially-available Nafion probably due to the restricted structures.
Yamaki, Tetsuya; Kozone, Yuichi; Hiroki, Akihiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
no journal, ,
no abstracts in English
Yamaki, Tetsuya; Kozone, Yuichi; Hiroki, Akihiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
no journal, ,
We prepared polymer electrolyte fuel-cell membranes with controlled nano-scale proton conducting pathways by ion track technology. One of the preparation methods involves (1) the swift heavy ion irradiation of fluoropolymer films (track formation) and subsequent chemical etching to obtain nano-sized cylindrical pores and (2) introduction of sulfonic acid groups into the etched pores. The resulting membranes exhibited anisotropic conductivity in the thickness direction, less water uptake and methanol permeability compared to Nafion.
Yamaki, Tetsuya; Kozone, Yuichi; Hiroki, Akihiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
no journal, ,
Fluoropolymer-based electrolyte membranes for fuel cells were prepared by use of heavy ion beams from the synchrotron accelerator of TIARA, JAEA. The preparation method for these so-called "nano-scale structure-controlled membranes" involves (1) the swift heavy ion irradiation of polyvinylidene fluoride (PVDF) films and subsequent chemical etching to obtain cylindrical pores with a diameter of 100 nm and (2) the filling of proton-conducting polymer chains into the etched pores by -ray-induced graft polymerization. The proton transport only in the thickness direction was observed for the resulting membranes with controlled ion exchange capacities, indicating the formation of one-dimensional straight proton conducting pathways parallel to the ion-beam incident axis. The membranes exhibited less water uptake and lower methanol permeability compared to commercially-available Nafion probably because of such restricted structures that they had.
