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Oral presentation

Development of anion-exchange membranes by radiation grafting technique

Asano, Masaharu; Koshikawa, Hiroshi; Yamaki, Tetsuya; Yoshimura, Kimio; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Shishitani, Hideyuki*; Asazawa, Koichiro*; Yamaguchi, Susumu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of temperature on water permeation of ion exchange membrane for HI concentration

Tanaka, Nobuyuki; Yamaki, Tetsuya; Asano, Masaharu; Terai, Takayuki*; Onuki, Kaoru

no journal, , 

Effect of temperature on the water permeation of ion exchange membrane in a HIx solution (HI-I$$_{2}$$-H$$_{2}$$O mixture) was investigated for an electro-membrane process in the thermochemical water-splitting iodine-sulfur process. A theoretical formula was derived on the basis of the electrophoresis theory. In order to confirm the validation, the experimental results were correlated with the obtained formula and the results showed good agreement.

Oral presentation

Heavy-ion-beam irradiation effect of poly(vinylidene fluoride) films; Chemical structures and reactivity in latent tracks

Yamaki, Tetsuya; Koshikawa, Hiroshi; Asano, Masaharu; Maekawa, Yasunari; Severin, D.*; Seidl, T.*; Trautmann, C.*

no journal, , 

There has been a strong motivation for us to investigate the detailed chemistry of heavy-ion-induced degradation. We report here the results of our first experiments in this regard done at the newly installed M-branch of UNILAC accelerator, GSI. Commercially-available 25 $$mu$$m-thick PVDF films were irradiated at room temperature by 4.8 MeV/u $$^{238}$$U at fluencies of up to 6$$times$$10$$^{11}$$ ions/cm$$^{2}$$. This irradiation was performed in the multi-purpose chamber of the M3 beamline equipped with a Fourier-transform infrared (FT-IR) transmission spectrometer as well as a residual gas analyzer. When irradiated at a fluence of 1$$times$$10$$^{10}$$ ions/cm$$^{2}$$, the film showed three new absorption bands, which can be identified as in-chain and chain-end unsaturations in the PVDF main chain. According to the analysis of outgassing fragments, hydrogen fluoride can be predicted as degradation product for the formation of these unsaturated bonds.

Oral presentation

Development of nano-structure controlled polymer electrolyte fuel-cell membranes using high-energy heavy-ion beams; Irradiating-ion dependence of their dimensional stability

Yamaki, Tetsuya; Sekine, Toshihiko; Sawada, Shinichi; Koshikawa, Hiroshi; Asano, Masaharu; Suzuki, Akihiro*; Terai, Takayuki*; Maekawa, Yasunari

no journal, , 

We have been developing the electrolyte membranes for fuel cell applications by direct grafting into cylindrical latent tracks of swift heavy ions. This study deals with the effect of varying bombarding ions on the dimensional stability of this so-called nano-structure controlled membrane. A poly(ethylene-${it co}$-tetrafluoroethylene) (ETFE) film was irradiated with 56 MeV $$^{15}$$N, 150 MeV $$^{40}$$Ar, and 450 MeV $$^{129}$$Xe ions at fluences of 3.0$$times$$10$$^{9}$$, 3.0$$times$$10$$^{8}$$, and 3.0$$times$$10$$^{7}$$ ions/cm$$^{2}$$, respectively. The membranes were prepared by our established method and then examined in terms of their area change due to water absorption. Interestingly, a swelling ratio depended largely on the bombarding ions. The percentage of proton conductive regions in the entire membrane was calculated by the diameter of each latent track and ion fluence and then used effectively for rationalizing the obtained results.

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