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Journal Articles

Thermal behavior, structure, dynamic properties of aqueous glycine solutions confined in mesoporous silica MCM-41 investigated by X-ray diffraction and quasi-elastic neutron scattering

Yoshida, Koji*; Inoue, Takuya*; Torigoe, Motokatsu*; Yamada, Takeshi*; Shibata, Kaoru; Yamaguchi, Toshio*

Journal of Chemical Physics, 149(12), p.124502_1 - 124502_10, 2018/09

 Times Cited Count:2 Percentile:83(Chemistry, Physical)

Differential scanning calorimetry, X-ray diffraction, and quasi-elastic neutron scattering (QENS) measurements of aqueous glycine solutions confined in mesoporous silica (MCM-41) were performed at different glycine concentrations, pH, and loading ratio (= mass of glycine solution / mass of dry MCM-41) in the temperature range from 305 to 180 K to discuss the confinement effect on the thermal behavior, the structure, and the dynamic properties of the solutions.

Journal Articles

AC calorimetry under high pressure

Haga, Yoshinori

Koatsuryoku No Kagaku To Gijutsu, 14(4), p.353 - 357, 2004/11

High-pressure technique is now recognized as an important tool to study strongy correlated electron systems. For the high-pressures above 2 GPa, resistivity measurements are commonly performed because of the restricted small sample space. In this review, recent efforts to measure specific heat under high pressure are presented.

Journal Articles

Heat capacity measurements on unirradiated and irradiated fuel pellets

Amaya, M.*; Une, Katsumi*; Minato, Kazuo

Journal of Nuclear Materials, 294(1-2), p.1 - 7, 2001/04

 Times Cited Count:12 Percentile:33.08(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Electrochemical calorimetry of D$$_{2}$$O electrolysis using a palladium cathode; An Undivided, open cell system

*; *; *; *; *; *; *; Oyama, Yukio; Nakamura, Tomoo; Shibata, Tokushi*; et al.

Bulletin of the Chemical Society of Japan, 63(9), p.2659 - 2664, 1990/09

 Times Cited Count:1 Percentile:84.04(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Fine structure of Wigner energy release spectrum in neutron-irradiated graphite

Journal of Nuclear Materials, 133-134, p.361 - 364, 1985/00

 Times Cited Count:47 Percentile:2.92(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Differential scanning calorimetric study of quenched-in vacancies in NiAl

*; ; *

Philos.Mag.Lett., 51(4), p.L49 - L53, 1985/00

no abstracts in English

JAEA Reports

Journal Articles

Studies of heavy ion damage in solids by calorimetric techniques

Hoshasen, 5(2), p.51 - 61, 1978/02

no abstracts in English

Oral presentation

Characterization and thermodynamic study of the protonation of humic acid dissolved in deep groundwater at Horonobe, Hokkaido, Japan

Kimuro, Shingo*; Kirishima, Akira*; Akiyama, Daisuke*; Sato, Nobuaki*; Nagao, Seiya*; Saito, Takumi*; Amano, Yuki; Miyakawa, Kazuya

no journal, , 

In this study, size exclusion chromatography (SEC), flow-field flow fractionation (Fl-FFF) and calorimetry were applied to the humic acid isolated from the groundwater collected at 350m below the ground level at the Horonobe Underground Research Laboratory, JAEA. First, the characteristic molecular weight distribution of Horonobe humic acids were observed from the SEC analysis. Second, the small hydrodynamic diameter of Horonobe humic acids were observed by the Fl-FFF. Finally, the protonation enthalpies of Horonobe humic acids were determined by the combination of potentiometry and calorimetry. The values of protonation enthalpy of Horonobe humic acids were close to simple organic acids (i.e., benzoic acid and phenol). It was suggested that Horonobe humic acids have lower molecular weight than IHSS surface soil humic acids (Elliot Soil and Waskish Peat) and the simple protonation mechanism, which is not affected by the heterogeneity.

Oral presentation

Thermodynamic study of complexation of deep groundwater humic acid by calorimetry

Kimuro, Shingo; Terashima, Motoki; Tachi, Yukio; Kitatsuji, Yoshihiro; Miyakawa, Kazuya; Akiyama, Daisuke*; Sato, Nobuaki*; Kirishima, Akira*

no journal, , 

Humic acid is confirmed to be present even in deep underground where radioactive wastes are planned to be disposed. Although the characteristic properties and reaction mechanism of humic acid are strongly affected by its origin, the reaction enthalpy and entropy for groundwater humic acid complexation are only estimated values obtained from the equilibrium constants at different temperature despite these thermodynamic quantities is necessary for the discussion of reaction thermodynamics. In this study, the thermodynamic quantities of the complexation of deep groundwater humic acid at Horonobe, Hokkaido, Japan with copper (II) and uranyl (VI) ion were determined by the combination of the potentiometry and calorimetry to cultivate a better understanding of the reaction mechanism. By the comparison of thermodynamic quantities with typical humic acid and simple organic acid, the characteristic reaction mechanism of Horonobe humic acid was revealed. In addition, thermodynamic equilibrium calculations based on the determined thermodynamic quantities were performed for the discussion of the impact of humic acid complexation and the origin of humic acid in the migration of radionuclide.

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