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Journal Articles

Methodology development for explosion hazard evaluation in hydrogen production system using high temperature gas-cooled reactor

Morita, Keisuke; Aoki, Takeshi; Shimizu, Atsushi; Sato, Hiroyuki

Proceedings of 31st International Conference on Nuclear Engineering (ICONE31) (Internet), 6 Pages, 2024/08

Journal Articles

Universal access to water-compatible and nanostructured materials via the self-assembly of cationic alternating copolymers

Sujita, Ryota*; Aoki, Hiroyuki; Takenaka, Mikihito*; Ouchi, Makoto*; Terashima, Takaya*

ACS Macro Letters (Internet), 13(6), p.747 - 753, 2024/06

 Times Cited Count:0 Percentile:0.00(Polymer Science)

Journal Articles

Hydrogenation of silicon-bearing hexagonal close-packed iron and its implications for density deficits in the inner core

Mori, Yuichiro*; Kagi, Hiroyuki*; Aoki, Katsutoshi*; Takano, Masahiro*; Kakizawa, Sho*; Sano, Asami; Funakoshi, Kenichi*

Earth and Planetary Science Letters, 634, p.118673_1 - 118673_8, 2024/05

 Times Cited Count:1 Percentile:73.79(Geochemistry & Geophysics)

To investigate silicon effects on the hydrogen-induced volume expansion of iron, neutron diffraction and X-ray diffraction experiments were conducted to examine hcp-Fe$$_{0.95}$$Si$$_{0.05}$$ under high pressures and high temperatures. Neutron diffraction experiments were performed on the deuterated hcp-Fe$$_{0.95}$$Si$$_{0.05}$$ at 13.5 GPa and 900 K, and at 12.1 GPa and 300 K. By combining the P-V-T equation of state of hcp-Fe$$_{0.95}$$Si$$_{0.05}$$, present results indicate that the hydrogen-induced volume expansion of hcp-Fe$$_{0.95}$$Si$$_{0.05}$$ is 10% greater than that of pure hcp iron. Using the obtained values, we estimated the hydrogen content that would reproduce the density deficit in the inner core, which was 50% less than that without the effect of silicon. Possible hydrogen content, $$x$$, in the inner core and the outer core was calculated to be 0.07 and 0.12-0.15, respectively, when reproducing the density deficit of the inner core with hcp-Fe$$_{0.95}$$Si$$_{0.05}$$Hx.

Journal Articles

Lamellar microphase separation and phase transition of hydrogen-bonding/crystalline statistical copolymers; Amide functionalization at the interface

Ikami, Takaya*; Aoki, Hiroyuki; Terashima, Takaya*

ACS Macro Letters (Internet), 13(4), p.446 - 452, 2024/04

 Times Cited Count:0 Percentile:0.00(Polymer Science)

Journal Articles

Development of a D$$_2$$O/H$$_2$$O vapor generator for contrast-variation neutron scattering

Arima-Osonoi, Hiroshi*; Takata, Shinichi; Kasai, Satoshi*; Ouchi, Keiichi*; Morikawa, Toshiaki*; Miyata, Noboru*; Miyazaki, Tsukasa*; Aoki, Hiroyuki; Iwase, Hiroki*; Hiroi, Kosuke; et al.

Journal of Applied Crystallography, 56(6), p.1802 - 1812, 2023/12

 Times Cited Count:2 Percentile:60.51(Chemistry, Multidisciplinary)

Journal Articles

Microphase separation of cationic homopolymers bearing alkyl ammonium salts into sub-4 nm lamellar materials with water intercalation channels

Sujita, Ryota*; Imai, Sahori*; Ouchi, Makoto*; Aoki, Hiroyuki; Terashima, Takaya*

Macromolecules, 56(23), p.9738 - 9749, 2023/12

 Times Cited Count:2 Percentile:35.88(Polymer Science)

Journal Articles

Adhesion interface studied by neutron reflectometry

Aoki, Hiroyuki

Hamon, 33(4), p.142 - 145, 2023/11

Journal Articles

Strain-induced crystallization and phase separation used for fabricating a tough and stiff slide-ring solid polymer electrolyte

Hashimoto, Kei*; Shiwaku, Toru*; Aoki, Hiroyuki; Yokoyama, Hideaki*; Mayumi, Koichi*; Ito, Kozo*

Science Advances (Internet), 9(47), p.eadi8505_1 - eadi8505_8, 2023/11

 Times Cited Count:25 Percentile:96.12(Multidisciplinary Sciences)

Journal Articles

Development of coupling technology for high temperature gas-cooled reactors and hydrogen production facility; HTTR heat application test project plan

Ishii, Katsunori; Morita, Keisuke; Noguchi, Hiroki; Aoki, Takeshi; Mizuta, Naoki; Hasegawa, Takeshi; Nagatsuka, Kentaro; Nomoto, Yasunobu; Shimizu, Atsushi; Iigaki, Kazuhiko; et al.

Dai-27-Kai Doryoku, Enerugi Gijutsu Shimpojiumu Koen Rombunshu (Internet), 4 Pages, 2023/09

Journal Articles

Neutron reflectometry analysis of condensed water layer formation at a solid interface of epoxy resins under high humidity

Liu, Y.*; Miyata, Noboru*; Miyazaki, Tsukasa*; Shundo, Atsuomi*; Kawaguchi, Daisuke*; Tanaka, Keiji*; Aoki, Hiroyuki

Langmuir, 39(29), p.10154 - 10162, 2023/06

 Times Cited Count:4 Percentile:62.38(Chemistry, Multidisciplinary)

Journal Articles

Development plan for coupling technology between high temperature gas-cooled reactor HTTR and Hydrogen Production Facility, 2; Development plan for coupling equipment between HTTR and Hydrogen Production Facility

Mizuta, Naoki; Morita, Keisuke; Aoki, Takeshi; Okita, Shoichiro; Ishii, Katsunori; Kurahayashi, Kaoru; Yasuda, Takanori; Tanaka, Masato; Isaka, Kazuyoshi; Noguchi, Hiroki; et al.

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 6 Pages, 2023/05

Journal Articles

Development plan for coupling technology between high temperature gas-cooled reactor HTTR and hydrogen production facility, 1; Overview of the HTTR heat application test plan to establish high safety coupling technology

Nomoto, Yasunobu; Mizuta, Naoki; Morita, Keisuke; Aoki, Takeshi; Okita, Shoichiro; Ishii, Katsunori; Kurahayashi, Kaoru; Yasuda, Takanori; Tanaka, Masato; Isaka, Kazuyoshi; et al.

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 7 Pages, 2023/05

Journal Articles

Validation of evaluation model for analysis of steam reformer in HTGR hydrogen production plant

Ishii, Katsunori; Aoki, Takeshi; Isaka, Kazuyoshi; Noguchi, Hiroki; Shimizu, Atsushi; Sato, Hiroyuki

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 9 Pages, 2023/05

Journal Articles

Development of safety design philosophy of HTTR-Heat Application Test Facility

Aoki, Takeshi; Shimizu, Atsushi; Noguchi, Hiroki; Kurahayashi, Kaoru; Yasuda, Takanori; Nomoto, Yasunobu; Iigaki, Kazuhiko; Sato, Hiroyuki; Sakaba, Nariaki

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 9 Pages, 2023/05

The safety design philosophy is developed for the HTTR (High Temperature Engineering Test Reactor) heat application test facility connecting high temperature gas-cooled reactor (HTGR) and the hydrogen production plant. The philosophy was proposed to apply proven conventional chemical plant standards to the hydrogen production facility for ensuring public safety against anticipated disasters caused by high pressure and combustible gases. The present study also proposed the safety design philosophy to meet specific safety requirements identified to the nuclear facilities with coupling to the hydrogen production facility such as measures to ensure a capability of normal operation of the nuclear facility against a fire and/or explosion of leaked combustible material, and fluctuation of amount of heat removal occurred in the hydrogen production plant. The safety design philosophy will be utilized to establish its basic and detailed designs of the HTTR-heat application test facility.

Journal Articles

Hydrogen occupation and hydrogen-induced volume expansion in Fe$$_{0.9}$$Ni$$_{0.1}$$D$$_x$$ at high $$P-T$$ conditions

Shito, Chikara*; Kagi, Hiroyuki*; Kakizawa, Sho*; Aoki, Katsutoshi*; Komatsu, Kazuki*; Iizuka, Riko*; Abe, Jun*; Saito, Hiroyuki*; Sano, Asami; Hattori, Takanori

American Mineralogist, 108(4), p.659 - 666, 2023/04

 Times Cited Count:3 Percentile:71.64(Geochemistry & Geophysics)

The phase relation and crystal structure of Fe$$_{0.9}$$Ni$$_{0.1}$$H$$_x$$ (D$$_x$$) at high pressures and temperatures up to 12 GPa and 1000 K were clarified by in-situ X-ray and neutron diffraction measurements. Under $$P-T$$ conditions of the present study, no deuterium atoms occupied tetragonal ($$T$$) sites of face-centered cubic (fcc) Fe$$_{0.9}$$Ni$$_{0.1}$$D$$_x$$ unlike fcc FeH$$_x$$(D$$_x$$). The deuterium-induced volume expansion per deuterium $$v_mathrm{D}$$ was determined as 2.45(4) $AA$^3$$ and 3.31(6) $AA$^3$$ for fcc and hcp phases, respectively, which were significantly larger than the corresponding values for FeD$$_x$$. The $$v_mathrm{D}$$ value slightly increased with increasing temperature. This study suggests that only 10% of nickel in iron drastically changes the behaviors of hydrogen in metal. Assuming that $$v_mathrm{D}$$ is constant regardless of pressure, the maximum hydrogen content in the Earth's inner core is estimated to be one to two times the amount of hydrogen in the oceans.

Journal Articles

Dynamic exchange of amphiphilic random copolymers between micelles in water; Kinetics and mechanism analyzed by TR-SANS

Hibino, Masayuki*; Takata, Shinichi; Hiroi, Kosuke; Aoki, Hiroyuki; Terashima, Takaya*

Macromolecules, 56(8), p.2955 - 2964, 2023/04

 Times Cited Count:3 Percentile:18.26(Polymer Science)

Journal Articles

Neutron reflectivity study on the nanostructure of PMMA chains near substrate interfaces based on contrast variation accompanied with small molecule sorption

Shimokita, Keisuke*; Yamamoto, Katsuhiro*; Miyata, Noboru*; Nakanishi, Yohei*; Shibata, Motoki*; Takenaka, Mikihito*; Yamada, Norifumi*; Seto, Hideki*; Aoki, Hiroyuki; Miyazaki, Tsukasa*

Soft Matter, 19(11), p.2082 - 2089, 2023/03

 Times Cited Count:2 Percentile:54.76(Chemistry, Physical)

Journal Articles

Interfacial distribution of Nafion ionomer thin films on nitrogen-modified carbon surfaces

Yoshimune, Wataru*; Kikkawa, Nobuaki*; Yoneyama, Hiroaki*; Takahashi, Naoko*; Minami, Saori*; Akimoto, Yusuke*; Mitsuoka, Takuya*; Kawaura, Hiroyuki*; Harada, Masashi*; Yamada, Norifumi*; et al.

ACS Applied Materials & Interfaces, 14(48), p.53744 - 53754, 2022/11

 Times Cited Count:8 Percentile:61.14(Nanoscience & Nanotechnology)

Journal Articles

Neutron reflectivity study on the suppression of interfacial water accumulation between a polypropylene thin film and Si substrate using a silane-coupling agent

Shimokita, Keisuke*; Yamamoto, Katsuhiro*; Miyata, Noboru*; Arima-Osonoi, Hiroshi*; Nakanishi, Yohei*; Takenaka, Mikihito*; Shibata, Motoki*; Yamada, Norifumi*; Seto, Hideki*; Aoki, Hiroyuki; et al.

Langmuir, 38(41), p.12457 - 12465, 2022/10

 Times Cited Count:2 Percentile:18.86(Chemistry, Multidisciplinary)

Journal Articles

Water-assisted microphase separation of cationic random copolymers into sub-5 nm lamellar materials and thin films

Imai, Sahori*; Arakawa, Masato*; Nakanishi, Yohei*; Takenaka, Mikihito*; Aoki, Hiroyuki; Ouchi, Makoto*; Terashima, Takaya*

Macromolecules, 55(20), p.9113 - 9125, 2022/10

 Times Cited Count:4 Percentile:34.08(Polymer Science)

305 (Records 1-20 displayed on this page)