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Search Results: Records 1-8 displayed on this page of 8

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Journal Articles

Depth profile analysis of multi-layer laminated thin film interface by spatiotemporal angle-resolved APXPS method

Toyoda, Satoshi*; Yoshimura, Masashi*; Sumida, Hirosuke*; Mineoi, Susumu*; Machida, Masatake*; Yoshigoe, Akitaka; Yoshikawa, Akira*; Suzuki, Satoru*; Yokoyama, Kazushi*

Hoshako, 35(3), p.200 - 206, 2022/05

The present status of spatiotemporal depth profiling analysis of the multilayer stacked film interface based on Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS) is presented. To begin with, depth profiles of the multilayer stacked film interfaces have been achieved by time-division Near Ambient Pressure Hard X-ray Angle-Resolved PhotoEmission Spectroscopy data. We then have promoted our methods to quickly perform peak fittings and depth profiling from time-division angle resolved AP-XPS data including spatial resolution, which enables us to realize spatiotemporal depth profiles of the interfaces under reaction conditions such as oxidation and reduction. In addition, it is found that the traditional maximum entropy method (MEM) combined with Jackknife averaging of sparse modeling is effective to perform dynamic measurement of depth profiles with high precision.

Journal Articles

Study of catalytic reaction at electrode-electrolyte interfaces by a CV-XAFS method

Kusano, Shogo*; Matsumura, Daiju; Asazawa, Koichiro*; Kishi, Hirofumi*; Sakamoto, Tomokazu*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Mizuki, Junichiro*

Journal of Electronic Materials, 46(6), p.3634 - 3638, 2017/06

https://doi.org/10.1007/s11664-016-5259-x

Times Cited Count：3 Percentile：19.84(Engineering, Electrical & Electronic)

Journal Articles

Structural kinetics studies on phase transitions of the Bi UPD layer between the (2 2) and ( ) structures using surface X-ray diffraction

Tamura, Kazuhisa; Mizuki, Junichiro

Journal of Physical Chemistry B, 109(26), p.12832 - 12836, 2005/07

https://doi.org/10.1021/jp0455632

Times Cited Count：2 Percentile：4.61(Chemistry, Physical)

The kinetics of the phase transition between the (2 2) and ( )-Bi structures on Au(111) was investigated using electrochemical methods and time-resolved surface X-ray diffraction. The temporal changes in the current value and the diffracted X-ray intensity that originated from the (2 2)-Bi overlayer were monitored during the phase transitions at various overpotentials. For the ( ) (2 2) phase transition, the phase transition models determined by the X-ray and electrochemical measurements were a surface-diffusion controlled instantaneous nucleation-growth process and a Langmuir process, respectively. For the reverse transition, the phase transition models determined by X-ray and electrochemical measurements were a Langmuir adsorption process and a surface diffusion controlled nucleation-growth process, respectively.

Journal Articles

Effects of salt concentration on association of the amyloid protofilaments of hen egg white lysozyme studied by time-resolved neutron scattering

Fujiwara, Satoru; Matsumoto, Fumiko*; Yonezawa, Yasushige*

Journal of Molecular Biology, 331(1), p.21 - 28, 2003/08

https://doi.org/10.1016/S0022-2836(03)00722-8

Times Cited Count：45 Percentile：59.1(Biochemistry & Molecular Biology)

The kinetic process of the fibril formation of hen egg white lysozyme (HEWL) in 90% ethanol in various salt concentrations has been investigated with time-resolved neutron scattering. It was shown that by addition of NaCl in a range between 0.3 mM and 1.0 mM, gelation occurred, and this gelation proceed through a two-step process; the lateral association of the protofilaments formed by HEWL, followed by the cross-linking of these fibrils formed. Both the structures of the fibrils and the rate of the gelation depended on NaCl concentration. Above 2 mM NaCl, precipitation occurred because of the formation of amorphous aggregates. Sensitivity of the aggregated structures to salt concentration suggests that electrostatic interaction plays an essential role in the formation of these structures. The structural diversity both in the fibrils and the aggregated structures of the fibrils can be interpreted in terms of the difference in the degree of the electrostatic shielding at different salt concentrations.

Journal Articles