Development of proton exchange membranes for hydriodic acid concentration by ion-track grafting technique

Tanaka, Nobuyuki; Sawada, Shinichi*; Sugimoto, Chihiro; Yamaki, Tetsuya*

QST-M-33; QST Takasaki Annual Report 2020, P. 37, 2022/03

https://repo.qst.go.jp/records/83072

We have been developing the ion exchange membranes by a radiation grafted polymerization method to improve HI concentration performance for Electro-electrodialysis (EED) in the thermochemical water-splitting hydrogen production iodine-sulfur process. We verify to adopt the cation exchange membrane prepared by ion-track grafted technique. In this membrane preparation technique, one-dimensional cylindrical ion-channel can be formed in the base polymer film by the radiation of the heavy ion beam. And, the excess swelling of the ion-channel could be prevented, expecting that the HI concentration performance could be improved. In our works, The HI concentration experiment was conducted by the electric cell assembled the membrane prepared by the ion-track grafting technique. The HI composition of the tested solution increased, indicating that the tested membrane can operate HI concentration by EED.

Crustal deformation analysis by using GPS observation data before and after Tohoku-oki Earthquake in northern Hokkaido, Japan

Tokiwa, Tetsuya; Sugimoto, Shingo*

JAEA-Data/Code 2012-033, 28 Pages, 2013/03

JAEA-Data-Code-2012-033.pdf:10.56MB

GPS analysis was carried out to understand the characteristics of the crustal deformation due to the Tohoku-oki Earthquake in the northern Hokkaido, Japan. The data period for the analysis is from October 1, 2010 to May 31, 2011. The result of the analysis indicated that the displacement in the direction of the south-southeast was detected in this area, and the amount of displacement of the western side of northern Hokkaido is relatively larger than that of the eastern side. Therefore, the eastern side of northern Hokkaido was displaced to the north with respect to Horonobe area, and the west side was displaced to the south. Although the analysis period is short, the crustal deformation is different from a seismic crustal deformation showing the E-W crustal compression.

Conceptual design and related R&D on ITER mechanical based primary pumping system

Tanzawa, Sadamitsu; Hiroki, Seiji; Abe, Tetsuya; Shimizu, Katsusuke*; Inoue, Masahiko*; Watanabe, Mitsunori*; Iguchi, Masashi*; Sugimoto, Tomoko*; Inohara, Takashi*; Nakamura, Junichi*

JAEA-Technology 2008-076, 99 Pages, 2008/12

JAEA-Technology-2008-076.pdf:35.19MB

The primary vacuum pumping system of the International Thermonuclear Experimental Reactor (ITER) exhausts a helium (He) ash resulting from the DT-burn with excess DT fueling gas, as well as performing a variety of functions such as pump-down, leak testing and wall conditioning. A mechanical based vacuum pumping system has some merits of a continuous pumping, a much lower tritium inventory, a lower operational cost and easy maintenance, comparing with a cryopump system, although demerits of an indispensable magnetic shield and insufficient performance for hydrogen (H) pumping are well recognized. To overcome the demerits, we newly fabricated and tested a helical grooved pump (HGP) unit suitable for H pumping at the ITER divertor pressure of 0.1-10 Pa. Through this R&D, we successfully established many design and manufacturing databases of large HGP units for the lightweight gas pumping. Based on the databases, we conceptually designed the ITER vacuum pumping system mainly comprising the HGP with an optimal pump unit layout and a magnetic shield. We also designed conceptually the reduced cost (RC)-ITER pumping system, where a compound molecular pump combining turbine bladed rotors and helical grooved ones was mainly used. The ITER mechanical based primary pumping system proposed has eventually been a back-up solution, whereas a cryopump based one was formally selected to the ITER for construction.

Cell cycle arrest and apoptosis in 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

https://doi.org/10.1080/09553000600577821

no abstracts in English

Study of biological responses to ionizing radiation in the germline cells of

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

Synthesis of a nitrogen-containing carbon material with oxygen reduction activity from polymer precursors

Idesaki, Akira; Sugimoto, Masaki; Shimada, Akihiko; Yamamoto, Shunya; Taguchi, Mitsumasa; Yamaki, Tetsuya

no journal, , 

Recently, development of platinum-substitute catalysts has been studied extensively; it has been found that a nitrogen-containing carbon material shows oxygen reduction activity almost same as platinum metal. We have been studying about synthesis process of a nitrogen-containing carbon material by pyrolysis of polymer precursors which are easy to be shaped as fiber, film, and so on. In this work, some materials were selected as polymer precursors and their organic-inorganic conversion process were investigated. It was found that polyimide and phenol resin show high carbon yield of 50-60% and graphite structure is formed above 800C.

Synthesis of carbon-based electrocatalysts by electron beam irradiation

Ota, Tomonori*; Hagiwara, Tokio*; Sugimoto, Masaki; Yamamoto, Shunya; Koshikawa, Hiroshi; Yamaki, Tetsuya

no journal, , 

Nitrogen (N)-doped carbon-based electrocatalysts are expected as a platinum alternative material for cost reduction of polymer electrolyte membrane fuel cells. However, nobody has not yet established the method of introducing N atoms in a graphene structure at high concentrations. Therefore, our purpose is to propose a new method of N doping using electron beam irradiation at high temperatures in an ammonia atmosphere. We developed here a sample chamber with a heating device, gas inlet and outlet, which made it possible to perform the irradiation without any temperature change. As a result, the phenolic resin, that is, a source of carbon-based electrocatalysts was irradiated with 2 MeV electrons at a dose rate of 2 kGy/s while being maintained at 300 C with a high precision as 2 C.

Effect of nitrogen doping in carbon-based catalyst materials by electron-beam irradiation in ammonia

Ota, Tomonori*; Yamaki, Tetsuya; Sugimoto, Masaki; Yamamoto, Shunya; Koshikawa, Hiroshi; Hagiwara, Tokio*

no journal, , 

Nitrogen-doped carbon-based catalysts are expected as Pt alternatives, and however there have been so far no established methods to introduce N atoms into graphene structures. Thus, we report N doping in carbon-based catalysts by electron beam (EB) irradiation in ammonia (NH). A precursor was phenolic resin or its mixture with 5 or 10 wt% cobalt(II) chloride (CoCl); it was then irradiated with 2 MeV electron beam up to a dose of 6 MGy in 1 vol% NH at 400C. This irradiated powder was carbonized in an Ar atmosphere at 800C for 1 h. An N-doping level reached an atomic concentration of ca. 0.5% when 5 wt% CoCl was mixed in the precursor.

L X-ray spectrometry of transuranium elements using the TES microcalorimeter

Nakamura, Keisuke; Sugimoto, Tetsuya*; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Morishita, Yuki; Takasaki, Koji; Mitsuda, Kazuhisa*

no journal, , 

no abstracts in English

Development of proton exchange membranes for hydriodic acid concentration by ion-track grafting technique

Tanaka, Nobuyuki; Sawada, Shinichi*; Sugimoto, Chihiro; Yamaki, Tetsuya*

no journal, , 

We have been developing the ion exchange membranes by a radiation grafted polymerization method to improve HI concentration performance for Electro-electrodialysis (EED) in the thermochemical water-splitting hydrogen production iodine-sulfur process. We verify to adopt the cation exchange membrane prepared by ion-track grafted technique. In this membrane preparation technique, one-dimensional cylindrical ion-channel can be formed in the base polymer film by the radiation of the heavy ion beam. And, the excess swelling of the ion-channel could be prevented, expecting that the HI concentration performance could be improved. In our works, The HI concentration experiment was conducted by the electric cell assembled the membrane prepared by the ion-track grafting technique. The HI composition of the tested solution increased, indicating that the tested membrane can operate HI concentration by EED.