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Journal Articles

Electrical and crystallographic study of an electrothermodynamic cycle for a waste heat recovery

Kim, J.*; Yamanaka, Satoru*; Nakajima, Akira*; Kato, Takanori*; Kim, Y.*; Fukuda, Tatsuo; Yoshii, Kenji; Nishihata, Yasuo; Baba, Masaaki*; Takeda, Masatoshi*; et al.

Advanced Sustainable Systems (Internet), 2(11), p.1800067_1 - 1800067_8, 2018/11

 Times Cited Count:1 Percentile:11.84(Green & Sustainable Science & Technology)

Journal Articles

Temperature stability of PIN-PMN-PT ternary ceramics during pyroelectric power generation

Moro, Takuya*; Kim, J.*; Yamanaka, Satoru*; Murayama, Ichiro*; Kato, Takanori*; Nakayama, Tadachika*; Takeda, Masatoshi*; Yamada, Noboru*; Nishihata, Yasuo; Fukuda, Tatsuo; et al.

Journal of Alloys and Compounds, 768, p.22 - 27, 2018/11

 Times Cited Count:10 Percentile:66.99(Chemistry, Physical)

Journal Articles

Pyroelectric power generation with ferroelectrics (1-x)PMN-xPT

Kim, J.*; Yamanaka, Satoru*; Nakajima, Akira*; Kato, Takanori*; Kim, Y.*; Fukuda, Tatsuo; Yoshii, Kenji; Nishihata, Yasuo; Baba, Masaaki*; Takeda, Masatoshi*; et al.

Ferroelectrics, 512(1), p.92 - 99, 2017/08

 Times Cited Count:6 Percentile:41.1(Materials Science, Multidisciplinary)

Journal Articles

Relationship between the material properties and pyroelectric-generating performance of PZTs

Yamanaka, Satoru*; Kim, J.*; Nakajima, Akira*; Kato, Takanori*; Kim, Y.*; Fukuda, Tatsuo; Yoshii, Kenji; Nishihata, Yasuo; Baba, Masaaki*; Yamada, Noboru*; et al.

Advanced Sustainable Systems (Internet), 1(3-4), p.1600020_1 - 1600020_6, 2017/04

no abstracts in English

Journal Articles

Novel electrothermodynamic power generation

Kim, Y.*; Kim, J.*; Yamanaka, Satoru*; Nakajima, Akira*; Ogawa, Takashi*; Serizawa, Takeshi*; Tanaka, Hirohisa*; Baba, Masaaki*; Fukuda, Tatsuo; Yoshii, Kenji; et al.

Advanced Energy Materials, 5(13), p.1401942_1 - 1401942_6, 2015/07

 Times Cited Count:8 Percentile:41.84(Chemistry, Physical)

An innovative electro-thermodynamic cycle based on temporal temperature variations using pyroelectric effect has been presented. Practical energy is successfully generated in both $textit{in-situ}$ synchrotron X-ray diffraction measurements under controlled conditions and $textit{Operando}$ real engine dynamometer experiments. The main generating origin is revealed as a combination of a crystal structure change and dipole change phenomenon corresponds to the temperature variation. In particular, the electric field induced 180$$^circ$$ domain switching extremely improves generating power, and the true energy breakeven with temperature variation is firstly achieved.

Journal Articles

Speciation of radioactive soil particles in the Fukushima contaminated area by IP autoradiography and microanalyses

Mukai, Hiroki*; Hatta, Tamao*; Kitazawa, Hideaki*; Yamada, Hirohisa*; Yaita, Tsuyoshi; Kogure, Toshihiro*

Environmental Science & Technology, 48(22), p.13053 - 13059, 2014/12

 Times Cited Count:94 Percentile:95.71(Engineering, Environmental)

no abstracts in English

Journal Articles

Cesium-adsorption behavior of weathered biotite from Fukushima Prefecture depends on the degree of vermiculitization

Yamada, Hirohisa*; Yokoyama, Shingo*; Watanabe, Yujiro*; Suzuki, Masaya*; Suzuki, Shinichi; Hatta, Tamao*

Nihon Ion Kokan Gakkai-Shi, 25(4), p.207 - 211, 2014/11

Journal Articles

Practical approach to decontamination of radioactive cesium-contaminated matter in agricultural region by improved wet classification and use of geomaterials

Ito, Kenichi*; Miyahara, Hidetaka*; Ujiie, Toru*; Takeshima, Toshikatsu*; Yokoyama, Shingo*; Nakata, Kotaro*; Nagano, Tetsushi; Sato, Tsutomu*; Hatta, Tamao*; Yamada, Hirohisa*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 11(4), p.255 - 271, 2012/04

no abstracts in English

Journal Articles

Preparation of anion-exchange membranes for fuel cell applications by $$gamma$$-ray pre-irradiation grafting

Koshikawa, Hiroshi; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Yamaguchi, Susumu*; Yamamoto, Kazuya*; Asazawa, Koichiro*; Yamada, Koji*; Tanaka, Hirohisa*

Proceedings of 12th International Conference on Radiation Curing in Asia (RadTech Asia 2011) (Internet), p.240 - 241, 2011/06

The anion-exchange membranes (AEM) for fuel cells were prepared by the radiation-induced graft polymerization of chloromethylstyrene into poly(ethylene-co-tetrafluoroethylene) (ETFE) films and subsequent quaternization of the grafts with trimethylamine. When the AEM were treated in 1M-KOH and washed with N$$_{2}$$-saturated water, the membranes with chloride form can be converted quantitatively to hydroxide form. However, the hydroxide form was easily converted to the bicarbonate form by the treatment in non-bubbled (CO$$_{2}$$ dissolved) water. When we introduced the crosslinkers in polymer grafts, which is proved to be very effective in the proton conducting PEM having a poly(styrenesulfonic acid) grafts, the grafted AEM with both chloride and hydroxide forms showed only slight decrease of water uptake. It should be noted that AEM with hydroxide form showed very high tendency to absorb water.

Journal Articles

XAFS analysis of unpyrolyzed CoPPyC oxygen reduction catalysts for Anion-Exchange Membrane Fuel Cells (AMFC)

Asazawa, Koichiro*; Yamamoto, Kazuya*; Yamada, Koji*; Tanaka, Hirohisa*; Matsumura, Daiju; Tamura, Kazuhisa; Nishihata, Yasuo; Atanassov, P.*

ECS Transactions, 33(1), p.1751 - 1755, 2010/10

CoPPyC were analyzed with X-ray adsorption fine structure (XAFS) measurements. Acid-treated CoPPyC (CoPPyC-AT) has higher activity than PPyC for oxygen reduction reaction. From the analysis of EXAFS of Co, CoPPyC electrocatalysts as synthesized consist of two peaks. The peak around 1.6 ${AA}$ was assigned to Co-N and/or Co-O shells. The second peak around 2.6 ${AA}$ was assigned to Co-O-Co shells originated from cobalt hydroxide. CoPPyC-AT showed only one peak of assigned to Co-N and/or Co-O, and it indicates that cobalt hydroxide is removed by acid treatment. It is clear that a coexistence of cobalt and nitrogen in CoPPyC-AT shows specific performance, and pyrolysis is not necessary to make correlation of Co-N.

Journal Articles

Arsenate sorption on schwertmannite

Fukushi, Keisuke*; Sato, Tsutomu*; Yanase, Nobuyuki; Minato, Junichi*; Yamada, Hirohisa*

American Mineralogist, 89(11-12), p.1728 - 1734, 2004/11

The sorption mechanism of As(V) on schwertmannite was investigated by both a batch sorption experiment and crystallographic considerations. The batch experiment was carried out as a function of As(V) concentration in acidic solution at 25 $$^{circ}$$C. Crystallographic considerations indicate surface sites of schwertmannite comprise varied surface oxygen (hydroxyl) and SO$$_{4}$$ groups. Sorption experiments showed reactive surface sites for As(V) sorption are surface SO$$_{4}$$ groups. As(V) sorption mechanism involves ligand exchange with solid phase SO$$_{4}$$. Results also suggest monodentate As(V) coordination with surface adsorbed SO$$_{4}$$ sites and bidentate As(V) coordination in structural originated SO$$_{4}$$ sites. Estimated equilibrium constant for ligand exchange reaction describes the observed As(V) sorption behavior. The surface structure approach in this study reveals reactive surface sites in As(V) sorption on schwertmannite comprise surface SO$$_{4}$$ group instead of surface hydroxyl groups identified by former views.

JAEA Reports

None

Odakura, Makoto; *; Yamada, Kazuo; Ishikawa, Hirohisa; Kikuchi, Hiroshi*; ; Ishiguro, Katsuhiko

PNC TN8410 97-015, 29 Pages, 1997/01

PNC-TN8410-97-015.pdf:2.04MB

None

JAEA Reports

None

Myochin, Munetaka; Kosugi, Kazumasa; Wada, Yukio; Yamada, Kazuo; Seimiya, Hiroshi; Ishikawa, Hirohisa

PNC TN8410 96-071, 86 Pages, 1996/03

PNC-TN8410-96-071.pdf:36.39MB

None

Journal Articles

Effects of alpha decay on the properties of actual nuclear waste glass

Bamba, Tsunetaka; ; Muraoka, Susumu; Yamada, Kazuo*; Saito, Makoto*; Ishikawa, Hirohisa*; Sasaki, Noriaki*

Materials Research Society Symposium Proceedings, Vol.353, p.1397 - 1404, 1995/00

no abstracts in English

Journal Articles

Development of the Engineered Barriers for the Deep Geological Disposal of High-Level Radioactive Waste

Sasaki, Noriaki; Ishikawa, Hirohisa; Miyahara, Kaname; Yamada, Kazuo; Yusa, Yasuhisa

High Level Radioactive Waste Management 1990, p.675 - 682, 1990/00

Oral presentation

Preparation of anion-exchange membranes by radiation grafting and their fuel cell performance

Asano, Masaharu; Koshikawa, Hiroshi; Yamaki, Tetsuya; Maekawa, Yasunari; Yamaguchi, Susumu*; Asazawa, Koichiro*; Yamada, Koji*; Tanaka, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Preparation of anion-exchange membranes using ionizing radiation and their cell testing

Koshikawa, Hiroshi; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Yamaguchi, Susumu*; Asazawa, Koichiro*; Yamada, Koji*; Tanaka, Hirohisa*

no journal, , 

Anion-exchange membranes based on poly(ethylene-co-tetrafluoroethylene) (ETFE) were prepared by the $$gamma$$-ray graft polymerization of chloromethylstyrene (CMS) and the subsequent quaternization. The degree of grafting increased during the course of reaction for up to 8 h. We obtained higher degree of grafting as the pre-irradiation dose became higher. The highest degree of grafting reached 101% at a dose of 50 kGy for 8 h. The hydroxide ion conductivity was 0.044 S/cm at room temperature and a relative humidity of 100%. This value is higher than or comparable to that of the previous radiation-grafted anion-exchange membranes.

Oral presentation

Preparation of anion-exchange membranes by radiation grafting

Asano, Masaharu; Koshikawa, Hiroshi; Yamaki, Tetsuya; Maekawa, Yasunari; Yamaguchi, Susumu*; Yamamoto, Kazuya*; Asazawa, Koichiro*; Yamada, Koji*; Tanaka, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Preparation of anion-exchange membranes by radiation grafting and their cell testing; Effect of crosslinker

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 $$gamma$$-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.

Oral presentation

Preparation of anion-exchange membranes using ionizing radiation and their cell testing

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 $$gamma$$-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.

26 (Records 1-20 displayed on this page)