Effect of starch retrogradation on molecular dynamics of cooked rice by quasi-elastic neutron scattering

Hirata, Yoshinobu*; Nakagawa, Hiroshi; Yamauchi, Hiroki; Kaneko, Koji; Hagihara, Masato; Yamaguchi, Hideyuki*; Omoto, Chie*; Katsuno, Nakako*; Imaizumi, Teppei*; Nishizu, Takahisa*

Food Hydrocolloids, 141, p.108728_1 - 108728_7, 2023/08

https://doi.org/10.1016/j.foodhyd.2023.108728

Crystallinity is reflected in the mechanical properties of foods and materials. Crystallinity should be related to the structural dynamics of starch. In this study, we used quasi-elastic neutron scattering (QENS) to investigate changes in the molecular dynamics of cooked rice starch during retrogradation. The width of the measured QENS narrowed with retrogradation. The elastic incoherent structure factor (EISF) increased, which indicated that the molecular dynamics are spatially suppressed upon retrogradation. Analysis of EISF with a bimodal continuous diffusion model, where low and high mobilities are assumed to correspond to crystalline and amorphous phases, respectively, showed that the fraction of the low-mobility component increases with retrogradation.

Investigation of the electronic structure of the MgZnY alloy using X-ray photoelectron spectroscopy

Miyazaki, Hidetoshi*; Akatsuka, Tatsuyoshi*; Kimura, Koji*; Egusa, Daisuke*; Sato, Yohei*; Itakura, Mitsuhiro; Takagi, Yasumasa*; Yasui, Akira*; Ozawa, Kenichi*; Mase, Kazuhiko*; et al.

Materials Transactions, 64(6), p.1194 - 1198, 2023/06

https://doi.org/10.2320/matertrans.MT-MD2022019

We investigated the electronic structure of the MgZnY alloy using hard and soft X-ray photoemission spectroscopy and electronic band structure calculations to understand the mechanism of the phase stability of this material. Electronic structure of the MgZnY alloy showed a semi-metallic electronic structure with a pseudo-gap at the Fermi level. The observed electronic structure of the MgZnY alloy suggests that the presence of a pseudogap structure is responsible for phase stability.

Spin density wave in insulating ferromagnetic frustrated chain LiCuVO

Masuda, Takatsugu*; Hagihara, Masato*; Kondo, Yosuke*; Kaneko, Koji; Metoki, Naoto

Journal of the Physical Society of Japan, 80(11), p.113705_1 - 113705_4, 2011/11

https://doi.org/10.1143/JPSJ.80.113705

We study a field-induced quantum phase in the weakly-coupled ferromagnetic frustrated chain LiCuVO by a neutron diffraction technique. A new incommensurate magnetic peak is observed at H 8.5 T. The field-dependent propagation vector is identified with the spin density wave correlation in the theoretically predicted magnetic quadrupole order. Quantum fluctuation, geometrical frustration, and interchain interaction induce an exotic spin density wave long-range order in the insulating magnet.

Strain evaluation of Mg alloy with 18R long-period stacking ordered structure under compression

Shiro, Ayumi; Shobu, Takahisa; Hagihara, Koji*; Izuno, Hitoshi*

no journal, , 

Magnetic properties of a rhombic lattice antiferromagnet KCoPOHO

Fujihara, Masayoshi; Hagihara, Masato; Okabe, Hirotaka*; Nakamura, Jumpei*; Koda, Akihiro*; Matsuo, Akira*; Kindo, Koichi*; Munakata, Koji*; Ishikado, Motoyuki*

no journal, , 

no abstracts in English