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Journal Articles

Development of extraction chromatographic adsorbent using alkylpyridinedicarboxyamides as extractant for separation of trivalent minor actinides from lanthanides; Stability and separation ability against nitric acid exposure and $$gamma$$-ray irradiation

Arisaka, Makoto; Watanabe, Masayuki; Sugo, Yumi; Kobayashi, Kumiko*; Kanao, Osamu*; Kimura, Takaumi

Journal of Nuclear Science and Technology, 51(4), p.457 - 464, 2014/04

 Times Cited Count:1 Percentile:10.7(Nuclear Science & Technology)

Toward the development of a practical separation method for trivalent actinides and lanthanides, we used extraction chromatography with alkyl-pyridinedicarboxyamides as the extractant. The results confirmed that the performance degradation of the adsorbent caused by contact with HNO$$_{3}$$ and/or irradiation with $$gamma$$ rays would be very small during the operation of column chromatography. The optimal conditions for the column separation were also determined: eluent, 5M HNO$$_{3}$$; flow rate, 0.1 mL/min.

Journal Articles

Quantum beam technology; Nanostructured proton-conductive membranes prepared by swift heavy ion irradiation for fuel cell applications

Yamaki, Tetsuya; Kobayashi, Misaki*; Asano, Masaharu; Nomura, Kumiko*; Takagi, Shigeharu*; Maekawa, Yasunari; Yoshida, Masaru*

Proceedings of Sadoway 60 Symposium, p.114 - 120, 2010/06

My presentation deals with the application of high-energy heavy ion beams from the cyclotron accelerator of Takasaki Ion Accelerators for Advanced Radiation Application (TIARA), JAEA. Our strategic focus is centered on using nano-scale controllability of the ion-beam processing; the membrane preparation involves (1) the irradiation of commercially-available base polymer films with hundreds of MeV ions, (2) graft polymerization of vinyl monomers into electronically-excited parts along the ion trajectory, called latent tracks, and (3) sulfonation of the graft polymers. Interestingly, the resulting membranes exhibited anisotropic proton transport, i.e., higher conductivity in the thickness direction. According to microscopic observations, this is probably because the columnar electrolyte phase extended, with a width of tens-to-hundreds nanometers, through the membrane.

Journal Articles

Ion beam irradiation has different influences on glutathione peroxidase of cultured human retinal vascular endothelial cells among $$^{20}$$Ne, $$^{12}$$C, and $$^{4}$$He

Akeo, Kiyoshi*; Hamada, Nobuyuki*; Kobayashi, Yasuhiko; Funayama, Tomoo; Sakashita, Tetsuya; Akeo, Yoko*; Kawada, Kumiko*; Tsubota, Kazuo*

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 114, 2007/02

no abstracts in English

Journal Articles

Cell cycle arrest and apoptosis in ${it Caenorhabditis elegans}$ germline cells following heavy-ion microbeam irradiation

Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Wada, Seiichi; Hamada, Nobuyuki*; Kakizaki, Takehiko; Kobayashi, Yasuhiko; Higashitani, Atsushi*

International Journal of Radiation Biology, 82(1), p.31 - 38, 2006/01

 Times Cited Count:39 Percentile:92.82(Biology)

no abstracts in English

Oral presentation

Radiation effect and bystander effect of heavy ion particle irradiation on apoptosis in ${it Caenorhabditis elegans}$ germ cell development

Higashitani, Atsushi*; Sugimoto, Tomoko*; Dazai, Kumiko*; Mori, Chihiro*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

Induction of glutathione peroxidase of retinal vascular endothelial cells exposed to energetic heavy-ion beams

Akeo, Kiyoshi*; Hamada, Nobuyuki*; Kobayashi, Yasuhiko; Funayama, Tomoo; Sakashita, Tetsuya; Akeo, Yoko*; Kawada, Kumiko*; Tsubota, Kazuo*

no journal, , 

no abstracts in English

Oral presentation

Study of biological responses to ionizing radiation in the germline cells of ${it C. elegans}$

Mori, Chihiro*; Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko; Ichishi, Eiichiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Study of biological responses to heavy-ion microbeams in the nematode ${it C. elegans}$

Higashitani, Atsushi*; Mori, Chihiro*; Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

Development of polymer electrolyte membranes by ion-beam irradiation technique for fuel cell applications

Yamaki, Tetsuya; Kobayashi, Misaki*; Asano, Masaharu; Yoshida, Masaru; Nomura, Kumiko*; Takagi, Shigeharu*; Maekawa, Yasunari

no journal, , 

Fluoropolymer films were bombarded with swift heavy ions to produce an activated zone along the incident axis. The chemically active species generated in this so-called ion track were used to initiate the grafting of styrene, and the subsequent sulfonation of the graft chains provided the electrolyte membranes with anisotropic proton conductivity in the thickness direction. These membranes were found to have sufficient mechanical strength as well as highly conductive pathways with a cylindroidal shape of tens-to-hundreds nanometer size.

Oral presentation

Development of nanostructure-controlled fuel-cell membranes by ion irradiation technique

Kobayashi, Misaki*; Yamaki, Tetsuya; Nomura, Kumiko*; Takagi, Shigeharu*; Asano, Masaharu; Yoshida, Masaru; Maekawa, Yasunari

no journal, , 

To realize mass commercialization of fuel cell, many kinds of properties, such as high proton conductivity, low water swelling and high mechanical strength, are required for a polymer electrolyte membrane. Utilizing nano-scale controllability of an ion beam is our strategic way for the preparation of fuel-cell electrolyte membranes. The preparation of membranes involve (1) the irradiation of heavy ions with different masses and energies; (2) the grafting of styrene into electronically-excited region along the ion trajectory called the latent track; (3) sulfonation of the graft chains. According to the FE-SEM and TEM observations, the proton conductive electrolyte part appeared to extend through the membrane thickness with dimensions of tens-to-hundreds nanometers, which agreed with the calculated latent track diameter. Correlations between membrane properties, such as proton conductivity and nanostructure were investigated.

Oral presentation

Effect of ion beam irradiation on expression of glutathione peroxidase in cultured cell of human retinal vascular endothelium

Akeo, Kiyoshi*; Hamada, Nobuyuki*; Funayama, Tomoo; Kobayashi, Yasuhiko; Kawada, Kumiko*; Akeo, Yoko*

no journal, , 

no abstracts in English

Oral presentation

Development of nano-structure controlled polymer electrolyte fuel-cell membranes by high-energy heavy ion irradiation

Yamaki, Tetsuya; Asano, Masaharu; Kobayashi, Misaki*; Nomura, Kumiko*; Takagi, Shigeharu*; Maekawa, Yasunari; Yoshida, Masaru

no journal, , 

In order to develop proton-conductive membranes for PEFCs, we have been using high-energy heavy ion beams from the cyclotron accelerator of TIARA. Our strategic focus is centered on using nano-scale controllability of the ion-beam processing; the membrane preparation involves (1) the irradiation of commercially-available base polymer films with MeV ions, (2) graft polymerization of vinyl monomers into electronically-excited parts along the ion trajectory, called latent tracks, and (3) sulfonation of the graft polymers. Interestingly, the resulting membranes exhibited anisotropic proton transport, i.e., higher conductivity in the thickness direction. According to microscopic observations, this is probably because the columnar electrolyte phase extended, with a width of tens-to-hundreds nanometers, through the membrane. Other excellent membrane properties, e.g., sufficient mechanical strength, high dimensional stability, and low gas permeability should be due to such a controlled structure.

Oral presentation

Development of fuel-cell polymer electrolyte membranes by ion track technology

Yamaki, Tetsuya; Asano, Masaharu; Kobayashi, Misaki*; Nomura, Kumiko*; Takagi, Shigeharu*; Maekawa, Yasunari; Yoshida, Masaru

no journal, , 

We have been using high-energy heavy ion beams from the cyclotron accelerator of Takasaki Ion Accelerators for Advanced Radiation Application (TIARA), JAEA to develop proton-conductive membranes for PEFCs. Our strategic focus is centered on using nano-scale controllability of the ion-beam processing; the membrane preparation involves (1) the irradiation of commercially-available base polymer films with MeV ions, (2) graft polymerization of vinyl monomers into electronically-excited parts along the ion trajectory, called latent tracks, and (3) sulfonation of the graft polymers. Interestingly, the resulting membranes exhibited anisotropic proton transport, i.e., higher conductivity in the thickness direction. According to microscopic observations, this is probably because the columnar electrolyte phase extended, with a width of tens-to-hundreds nanometers, through the membrane. Other excellent membrane properties, e.g., sufficient mechanical strength, high dimensional stability, and low gas permeability should be due to such a controlled structure.

Oral presentation

Development of nano-structure controlled polymer electrolyte fuel-cell membranes by high-energy heavy ion irradiation

Yamaki, Tetsuya; Kobayashi, Misaki*; Asano, Masaharu; Nomura, Kumiko*; Takagi, Shigeharu*; Maekawa, Yasunari; Yoshida, Masaru*

no journal, , 

Our presentation deals with the application of high-energy heavy ion beams to the preparation of nano-structure controlled electrolyte membranes. The membrane preparation involves (1) irradiation of commercially-available base polymer films with 100 MeV $$^{16}$$O, 400 MeV $$^{56}$$Fe, or 450 MeV $$^{129}$$Xe, (2) graft polymerization of vinyl monomers into latent tracks, and (3) sulfonation of the graft polymers. The resulting membranes exhibited anisotropic proton transport, i.e., higher conductivity in the through-plane direction. According to microscopic observations, this is probably because the nearly columnar electrolyte phase with a width of tens-to-hundreds nanometers extended through the membrane. Interestingly, our ion irradiation technique would be able to control the nano-structure of proton-conducting pathways in the membranes. Other excellent membrane properties should also be due to such a controlled structure.

Oral presentation

Development of nano-structure controlled polymer electrolyte fuel-cell membranes by high-energy heavy-ion irradiation; Study of their proton conductivity

Yamaki, Tetsuya; Kobayashi, Misaki*; Asano, Masaharu; Nomura, Kumiko*; Takagi, Shigeharu*; Maekawa, Yasunari; Yoshida, Masaru*

no journal, , 

This study deals with the application of high-energy heavy ion beams from the cyclotron accelerator of Takasaki Ion Accelerators for Advanced Radiation Application (TIARA), JAEA. Our strategic focus is centered on using nano-scale controllability of the ion-beam processing; the membrane preparation involves (1) the irradiation of commercially-available base polymer films with hundreds of MeV ions, (2) graft polymerization of vinyl monomers into electronically-excited parts along the ion trajectory, called latent tracks, and (3) sulfonation of the graft polymers. The resulting membranes exhibited anisotropic proton transport, i.e., higher conductivity in the thickness direction. The through-plane proton conductivity, which is a more direct measurement of the membrane's conductivity and is of interest in an operating fuel cell, was comparable to that of a Nafion112 membrane at the same ion exchange capacity level.

Oral presentation

Analysis of relaxation times of radicals induced in irradiated soy beans

Kishida, Keigo*; Yamamoto, Kumiko*; Kikuchi, Masahiro; Kameya, Hiromi*; Shimoyama, Yuhei; Kobayashi, Yasuhiko; Todoriki, Setsuko*; Nakamura, Hideo*; Ukai, Mitsuko*

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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