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Takano, Katsuyoshi; Sato, Takahiro; Ishii, Yasuyuki; Koka, Masashi; Kamiya, Tomihiro; Okubo, Takeru; Sugimoto, Masaki; Nishikawa, Hiroyuki*; Seki, Shu*
Transactions of the Materials Research Society of Japan, 36(3), p.305 - 308, 2011/09
Yoneda, Yasuhiro; Abe, Hiroshi
Transactions of the Materials Research Society of Japan, 36(1), p.23 - 26, 2011/03
Metal nanoparticles embedded in insulating matrices have received an increasing interest in the last decade due to their peculiar optical, magnetic, and catalytic properties when the size becomes comparable to or less than the electron mean free path. Recently, oxide nanoparticles in insulators can be fabricated by combining the ion implantation and the thermal oxidation). In this method metal nano particles are formed inside of the insulators by ion implantation at first, then the metal nanoparticles are oxidized by thermally activated migration of oxygen in the insulators. In this study, we demonstrated the growth of Bi-Ti-O system by the Bi-ion implantation on TiO
textured substrate. We performed the Bi-ion implantation with Takasaki Ion Accelerators for Advanced Radiation Application (TIARA) and the grown nanoparticles were evaluated by synchrotron X-ray at SPring-8.
Chen, J.; Asano, Masaharu; Maekawa, Yasunari
no journal, ,
An aromatic polymer electrolyte membrane (PEM) was prepared by direct modification of polyetheretherketone (PEEK) film using the radiation-induced crosslinking and grafting techniques. The crosslinked PEEK (cPEEK) film retained high mechanical strength, and was not dissolved either in the grafting solution or in the sulfonation solution. Divinylbenzene (DVB) was thermally grafted into the cPEEK film, by which the following radiation induced grafting of styrene from 1-propanol solution was largely enhanced. The PEM was obtained by sulfonation of the styrene-grafted film. The water uptake, proton conductivity and methanol permeability of the PEM increased with increasing ion exchange capacity, which was a function of the grafting yield of styrene. The PEM exhibited better mechanical property compared to Nafion, and especially, a higher cell performance of direct methanol fuel cell at the high temperature, reaching a high maximum power density.
Asano, Masaharu; Chen, J.; Maekawa, Yasunari
no journal, ,
no abstracts in English
Yamaguchi, Daisuke; Koizumi, Satoshi; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*
no journal, ,
A comprehensive ultrasmall- and small-angle scattering analysis on the dispersion state of fillers in rubber/filler compounds is investigated. Recently, an effective size reduction of dispersible units of the fillers and consequential improvement of the property of the hysteresis loss was attained in the end functionalized S-SBR/filler system. Here S-SBR denotes solution polymerization styrene-butadiene rubber. To get more insight into the hierarchical structure of those systems, a complementary use of different contrasts between neutron and synchrotron X-ray was attempted. The different q-dependence of the scattering profiles taken by neutron and by X-ray suggested that two dominant structures exist in the system: one is the higher-order aggregations of the fillers and the other is the density fluctuations due to the vulcanization. By modification of the chain end of SBR with a functional group having the affinity for the fillers, the scattering signals originated from the vulcanization of SBR hardly changed, whereas those originated from the aggregation of the fillers distinctly changed. This tendency strongly supports the above scenario for the improvement of mechanical property of rubber/filler compounds.
Yamamoto, Shunya; Hakoda, Teruyuki; Kawaguchi, Kazuhiro; Yoshimura, Kimio; Yamaki, Tetsuya; Kobayashi, Tomohiro*; Yoshikawa, Masahito
no journal, ,
no abstracts in English
Nb)O
Owada, Kenji; Hirota, Kazuma*
no journal, ,
no abstracts in English
substrateKawaguchi, Kazuhiro; Takahiro, Katsumi*; Yamamoto, Shunya; Hakoda, Teruyuki; Yoshimura, Kimio; Yoshikawa, Masahito
no journal, ,
no abstracts in English
Yoshimura, Kimio; Hakoda, Teruyuki; Yamamoto, Shunya; Yoshikawa, Masahito
no journal, ,
no abstracts in English
Hiroki, Akihiro; Pham, T. T. H.*; Nagasawa, Naotsugu; Tamada, Masao
no journal, ,
no abstracts in English
Hiroki, Akihiro; Nagasawa, Naotsugu; Taguchi, Mitsumasa; Yoshii, Fumio
no journal, ,
Koshikawa, Hiroshi; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Yamaguchi, Susumu*; Yamamoto, Kazuya*; Asazawa, Koichiro*; Yamada, Koji*; Tanaka, Hirohisa*
no journal, ,
We prepared anion-exchange membranes based on an ethylene-tetrafluoroethylene copolymer by 
-ray-induced graft polymerization of chloromethylstyrene (CMS) and the subsequent quaternization reaction. The crosslinker effect was investigated in terms of membrane preparation and performance of a hydrazine fuel cell. The quaternization ratio appeared to decrease as the concentration of divinylbenzene (DVB) in the CMS grafting solution increased. Importantly, the crosslinker lowered the water uptake of the resulting membranes in the Cl
and OH forms, possibly thereby restricting excessive swelling during the fuel-cell operation.
Suzuki, Junichi; Takata, Shinichi; Shinohara, Takenao; Oku, Takayuki; Kira, Hiroshi; Nakatani, Takeshi; Inamura, Yasuhiro; Ito, Takayoshi; Suzuya, Kentaro; Aizawa, Kazuya; et al.
no journal, ,
no abstracts in English
model interface for polymer electrolyte fuel cellsFugane, Keisuke*; Mori, Toshiyuki*; Masuda, Takuya*; Uosaki, Kohei*; Yamamoto, Shunya; Maekawa, Yasunari
no journal, ,
no abstracts in English
Iwamatsu, Kazuhiro; Taguchi, Mitsumasa; Sugo, Yumi; Kimura, Atsushi; Kurashima, Satoshi; Katsumura, Yosuke
no journal, ,
no abstracts in English
