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Inaguma, Yoshiyuki*; Tanaka, Kie*; Tsuchiya, Takeshi*; Mori, Daisuke*; Katsumata, Tetsuhiro*; Oba, Tomonori*; Hiraki, Koichi*; Takahashi, Toshihiro*; Saito, Hiroyuki
Journal of the American Chemical Society, 133(42), p.16920 - 16929, 2011/09
Times Cited Count:86 Percentile:85.68(Chemistry, Multidisciplinary)Shiraki, Fumiya*; Yoshikawa, Taeko*; Oshima, Akihiro*; Oshima, Yuji*; Takasawa, Yuya*; Fukutake, Naoyuki*; Oyama, Tomoko*; Urakawa, Tatsuya*; Fujita, Hajime*; Takahashi, Tomohiro*; et al.
Nuclear Instruments and Methods in Physics Research B, 269(15), p.1777 - 1781, 2011/08
Times Cited Count:8 Percentile:53.23(Instruments & Instrumentation)The graded energy deposition of heavy ion beam irradiation to polymeric materials was utilized to synthesize a novel proton exchange membrane (PEM) with the graded density of sulfonic acid groups toward the thickness direction. Stacked Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) films were irradiated by Xe ion beam with the energy of 6 MeV/u under a vacuum condition. Irradiated films were grafted with styrene monomer and then sulfonated. The membrane electrode assembly (MEA) fabricated by the function graded PEM showed improved fuel cell performance in terms of voltage stability. It was expected that the function-graded PEM could control the graded concentration of sulfonic acid groups in PEM.
Nagao, Seiya; Matsunaga, Takeshi; Suzuki, Yasuhiro*; Hiraki, Keizo*
Chikyu Kagaku, 35(3), p.107 - 120, 2001/08
no abstracts in English
Suzuki, Yasuhiro*; Nagao, Seiya; Nakaguchi, Yuzuru*; Matsunaga, Takeshi; Muraoka, Susumu; Hiraki, Keizo*
Chikyu Kagaku, 31, p.171 - 180, 1997/00
no abstracts in English
Takasawa, Yuya*; Fukutake, Naoyuki*; Takahashi, Tomohiro*; Urakawa, Tatsuya*; Oshima, Yuji*; Gowa, Tomoko*; Shiraki, Fumiya*; Fujita, Hajime*; Oka, Toshitaka; Murakami, Takeshi*; et al.
no journal, ,
Kishimoto, Masahiko*; Abe, Hiroshi; Hiraki, Takeshi*; Uchida, Hirohisa*
no journal, ,
We investigated combinational effects of electron/ion beam irradiation and KOH alkaline pretreatment on initial hydrogen absorption reaction rate of Mm-Ni based alloy. In previous studies, we have reported that the alkaline pretreatment of the alloy surface using LiOH, NaON or KOH accelerates the rate of the initial activation. For the surface modification of materials, an electron/ion beam irradiation is well known to produce a high density of vacancy type defects in materials and to be a quite useful method. These facts give the possibility that the hydrogen absorptivity in Mm-Ni based alloy is improved by the surface modification on using an electron/ion beam irradiations. In this study, we performed electron (e) and proton ion (H) beam irradiation into MmNiCoMnAl (Mm = LaCe) at TIARA (Takasaki Ion Accelerators for Advanced Radiation Application), JAEA. For the electrochemical measurements of the initial hydrogen absorption reaction rate, either un-irraddiated or e/H beam irradiated MmNiCoMnAl was used as an anode. The hydrogen absorption rate of these samples with both 6M-KOH pretreatment and un-treatment was evaluated. Based on the obtained results, we discuss the correlation among e/H beam irradiation, alkaline pretreatment and initial hydrogen absorption rate in Mm-Ni based alloy.
Oshima, Akihiro*; Shiraki, Fumiya*; Takasawa, Yuya*; Fujita, Hajime*; Yoshikawa, Taeko*; Tatsumi, Takahiro*; Tsubokura, Hidehiro*; Takahashi, Tomohiro*; Gowa, Tomoko*; Sakaue, Kazuyuki*; et al.
no journal, ,
no abstracts in English
Washio, Masakazu*; Shiraki, Fumiya*; Oshima, Yuji*; Takasawa, Yuya*; Fujita, Hajime*; Gowa, Tomoko*; Kudo, Hisaaki*; Oka, Toshitaka; Hama, Yoshimasa*; Murakami, Takeshi*; et al.
no journal, ,
no abstracts in English
Muraki, Keita*; Kishimoto, Masahiko*; Abe, Hiroshi; Hiraki, Takeshi*; Uchida, Hirohisa*
no journal, ,
no abstracts in English
Muraki, Keita*; Nakagawa, Takuya*; Kishimoto, Masahiko*; Abe, Hiroshi; Hiraki, Takeshi*; Uchida, Hirohisa*
no journal, ,
In this study, we examined the effect of electron irradiation on the surface of a hydrogen storage alloy in order to improve the initial activation. We measured the initial rate of hydrogen absorption in an electrochemical process, and found that the electron irradiation treatment in the atmosphere is more effective than that in the vacuum or helium gas. Based on results of surface analysis of the alloy by ESCA, we found the existence of non-stoichiometric oxides of rare earths. As well known, non-stoichiometric rare earth oxides such as CeO and LaO has a high ability to dissociate covalent molecules like HO. This paper demonstrates an effective surface treatment of electron irradiation, and the important catalytic actions of rare earth oxides in the surface to improve the initial activation of the alloy.
Moriyama, Kazuhiro*; Muraki, Keita*; Kishimoto, Masahiko*; Abe, Hiroshi; Hiraki, Takeshi*; Uchida, Hirohisa*
no journal, ,
no abstracts in English
Tokuhira, Shinnosuke*; Ohata, Yuki*; Abe, Hiroshi; Hiraki, Takeshi*; Uchida, Hirohisa*
no journal, ,
no abstracts in English
Ono, Taiga*; Tokuhira, Shinnosuke*; Abe, Hiroshi; Hiraki, Takeshi*; Uchida, Hirohisa*
no journal, ,
no abstracts in English
Hiraki, Yoshihisa; Terasawa, Toshiharu*; Imaizumi, Ken*; Taniguchi, Takumi; Kato, Jun; Osugi, Takeshi; Sone, Tomoyuki; Nakazawa, Osamu; Kuroki, Ryoichiro
no journal, ,
The relationship between the amount of radionuclide to be solidified and the solidified body temperature was analyzed, when solidify contaminated water management waste at Fukushima Daiichi Nuclear Power Station with cement etc. at low temperature. The analysis code used the radiation transport code and the thermal analysis code. Thus, the limit value by radionuclide concentration during solidification process are evaluated. The summary of the test and some of the obtained results are introduced.
Hiraki, Yoshihisa; Enomoto, Mayu*; Terasawa, Toshiharu*; Imaizumi, Ken*; Kato, Jun; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro
no journal, ,
Evaluate the maximum temperature of solidified body, when Secondary Waste Produced from Contaminated Water Treatment at Fukushima Daiichi NPP is solidified with cement etc. Simulate various container shapes, and analysis using the radiation transport code and the thermal analysis code was performed. The summary of the test and some of the obtained results are introduced.
Kakuda, Ayaka; Osone, Osamu*; Hiraki, Yoshihisa; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro; Kudo, Isamu*; Elakneswaran, Y.*; Sato, Tsutomu*
no journal, ,
no abstracts in English
Hiraki, Yoshihisa; Saito, Toshimitsu*; Kakuda, Ayaka; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro; Kudo, Isamu*; Elakneswaran, Y.*; Sato, Tsutomu*
no journal, ,
no abstracts in English
Hiraki, Yoshihisa; Kakuda, Ayaka; Saito, Toshimitsu*; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro; Elakneswaran, Y.*; Sato, Tsutomu*
no journal, ,
no abstracts in English
Sato, Tsutomu*; Islam, C.*; Elakneswaran, Y.*; Hiraki, Yoshihisa; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro; Provis, J.*
no journal, ,
no abstracts in English
Hiraki, Yoshihisa; Kakuda, Ayaka; Saito, Toshimitsu*; Sone, Tomoyuki; Elakneswaran, Y.*; Sato, Tsutomu*; Osugi, Takeshi; Kuroki, Ryoichiro
no journal, ,
no abstracts in English