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Journal Articles

X-ray absorption spectra of aqueous cellobiose; Experiment and theory

Akazawa, Daisuke; Sasaki, Takehiko*; Nagasaka, Masanari*; Shiga, Motoyuki

Journal of Chemical Physics, 156(4), p.044202_1 - 044202_7, 2022/01

 Times Cited Count:6 Percentile:58.79(Chemistry, Physical)

The hydration structure of cellulose is very important for understanding the hydrolysis of cellulose at the molecular level. In this paper, we report a joint experimental and theoretical study on the X-ray absorption spectroscopy (XAS) of aqueous cellobiose, a disaccharide unit of cellulose. In the experimental part, high resolution measurements of the carbon K-edge XAS spectra were performed. It was found that the peak heights in the spectrum change considerably over the temperature range of 25 $$^{circ}$$C to 60 $$^{circ}$$C, which is a reflection of the number of hydrogen bonds between cellobiose and water. We suggest that this spectral change could be useful information for identifying the hydration of cellulose in various environments.

Journal Articles

Analytical method of $$gamma$$ emitters in seawater using coprecipitation with nickel hexacyanoferrate(II) and iron(III) hydroxide

Nakano, Masanao; Kokubun, Yuji; Sasaki, Takeshi*; Takeishi, Minoru

Radioisotopes, 58(2), p.61 - 69, 2009/02

The analytical yield of $$gamma$$ emitters in seawater by coprecipitation method with nickel hexacyanoferrate(II) and iron(III) hydroxide was confirmed using spiked radioisotope ($$^{137}$$Cs) and stable elements. Ninety-nine % of spiked $$^{137}$$Cs was adsorbed on nickel hexacyanoferrate(II), and 88 $$sim$$ 94% of spiked Ce, Co, Mn, Ru, Zn, Zr was adsorbed on iron(III) hydroxide. This analytical method is considered tobe very efficient and practical for environmental radiation monitoring from the view of quick and simple operation, especially easy analysis of plural samples.

Oral presentation

Development of SiC cladding for BWR application

Ishibashi, Ryo*; Hirosaka, Kazuma*; Ikegawa, Tomohiko*; Shibata, Masatoshi*; Sasaki, Masana*; Tsuchiya, Akiyuki*; Pham, V. H.; Kurata, Masaki; Nemoto, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Performance of Ti-coated SiC at high-temperature steam as accident tolerant fuel cladding

Pham, V. H.; Ishibashi, Ryo*; Sasaki, Masana*; Nemoto, Yoshiyuki; Yamashita, Shinichiro

no journal, , 

Oral presentation

Pirani vacuum gauge for J-PARC 3GeV synchrotron vacuum system

Kuroiwa, Masahide*; Sasaki, Masanao*; Fujii, Susumu*; Matsumoto, Nobuhiko*; Ogiwara, Norio; Arai, Hideyuki*

no journal, , 

no abstracts in English

Oral presentation

Accident-Tolerant Fuel R&D Program in Japan

Yamashita, Shinichiro; Mohamad, A. B.; Ioka, Ikuo; Nemoto, Yoshiyuki; Kawanishi, Tomohiro; Kaji, Yoshiyuki; Osaka, Masahiko; Murakami, Nozomu*; Owaki, Masao*; Sasaki, Masana*; et al.

no journal, , 

Japan's Accident Tolerant Fuel (ATF) research and development (R&D) program has been conducted since 2015 in cooperation with power plant providers, fuel venders and universities for making the most use of the experiences in R&D, practical design, and evaluations of fuels and cores of commercial Light Water Reactors (LWRs). An overview of the present R&D progress is given, in relation to the role of Japan Atomic Energy Agency (JAEA) in the program. The ATF candidate materials currently under consideration are the following three claddings: the silicon carbide (SiC) composite which is potentially applicable for Pressurized Water Reactor (PWR) and Boiling Water Reactor (BWR), the FeCrAl steel strengthened by dispersion of fine oxide particles (FeCrAl-ODS) for BWR, and Cr-coated zircalloy claddings for PWR. In addition to the cladding materials, R&D on the SiC-made BWR channel box and accident tolerant control rods are also underway.

Oral presentation

BeCu material vacuum chamber with NEG coating

Wada, Kaoru*; Shiga, Takashi; Okahashi, Kazunari*; Kamiya, Junichiro; Kobata, Masaaki; Morohashi, Yuko; Abe, Kazuhide; Kishikawa, Shinsuke*; Sasaki, Masanao*; Kuroiwa, Masahide*; et al.

no journal, , 

Tokyo Electronics Co., Ltd. manufactures and sells ultra-high vacuum equipment using BeCu material. By integrating this with the NEG coating technology from the Japan Atomic Energy Agency, the company has developed a getter-type BeCu vacuum chamber that can operate without electricity. In a series of experiments, the chamber was opened to the atmosphere, evacuated, and then subjected to a baking (activation) process at 200 for 8.5 hours, repeated five times. The results showed that the NEG coating significantly improved the pumping speed and reduced the ultimate pressure. Additionally, during buildup pressure measurements, this process was repeated five times. While there was no substantial difference in pressure before the tests, a noticeable improvement in pressure was observed with the NEG coating as the tests progressed. This demonstrates that the NEG coating not only enhances the efficiency of the vacuum system but also plays a crucial role in maintaining an ultra-high vacuum environment.

Oral presentation

R&D for introducing silicon carbide materials to safety improvement of BWR's core, 9; Joint strength evaluation of end-plug joints in SiC tubes at a sumilated severe accident, 2

Ishibashi, Ryo*; Hirosaka, Kazuma*; Shibata, Masatoshi*; Sasaki, Masana*; Tsuchiya, Akiyuki*; Nemoto, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

R&D for introducing silicon carbide materials to safety improvement of BWR's core, 10; Joint strength evaluation of end-plug joints in SiC tubes at a simulated severe accident, 3

Ishibashi, Ryo*; Hirosaka, Kazuma*; Shibata, Masatoshi*; Sasaki, Masana*; Nemoto, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Study on coating technic to enhance accident tolerance of fuel cladding II, 4; Steam oxidation of Ti-coated SiC as accident tolerant fuel cladding

Pham, V. H.; Ishibashi, Ryo*; Sasaki, Masana*; Nemoto, Yoshiyuki; Yamashita, Shinichiro

no journal, , 

Silicon carbide is the most prominent candidate for accident tolerant fuel cladding in terms of oxidation resistance and cladding integrity at high temperatures in steam. However, dilution of silica from SiC in aqueous environment under long-term corrosion can become a concern when considering SiC as nuclear graded materials. In order to improve its corrosion resistance in water for normal operations, coating of Ti layer on SiC was proposed. In this study, oxidation behavior and oxidation kinetics of Ti-coated SiC are studied via a thermogravimetric system at 1200-1500$$^{circ}$$C. Influence of the Ti coating layer on oxidation kinetics and behavior of SiC will then be discussed and reported.

Oral presentation

Development of SiC cladding for BWR application

Ishibashi, Ryo*; Hirosaka, Kazuma*; Yamana, Teppei*; Shibata, Masatoshi*; Sasaki, Masana*; Yasuda, Kenichi*; Nemoto, Yoshiyuki; Hinoki, Tatsuya*

no journal, , 

no abstracts in English

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