Sakaguchi Yoshifumi

Affiliation and department：

Research field (2)： Semiconductors, optical and atomic physics , Bio-, chemical, and soft-matter physics

Research keywords (7)： Sample environment , neutron reflectivity , Neutron scattering , photo-induced phenomena , chalcogenides , liquid semiconductors , amorphous semiconductors

Research theme for competitive and other funds (1)：

2013 - 2016 Self-ordering of liquid polymeric sulfur induced by spatial constraint - grazing-incident small-angle neutron scattering

Papers (91)：

Hiroki Iwase, Masaaki Akamatsu, Yasuhiro Inamura, Yoshifumi Sakaguchi, Kazuki Kobayashi, Hideki Sakai. Time-Resolved Structural Analysis of Fast-Photoresponsive Surfactant Micelles by Stroboscopic Small-Angle Neutron Scattering. Langmuir : the ACS journal of surfaces and colloids. 2023. 39. 35. 12357-12364
Yoshifumi Sakaguchi, Shin-chi Takata, Yukinobu Kawakita, Yuki Fujimura, Keietsu Kondo. Direct observation of concentration fluctuations in Au-Si eutectic liquid by small-angle neutron scattering. Journal of Physics: Condensed Matter. 2023. 35. 41. 415403-415403
Hiroki Iwase, Masaaki Akamatsu, Yasuhiro Inamura, Yoshifumi Sakaguchi, Toshiaki Morikawa, Satoshi Kasai, Keiichi Oh-uchi, Kazuki Kobayashi, Hideki Sakai. New measurement system based on small-angle neutron scattering for structural analysis of light-responsive materials. Journal of Applied Crystallography. 2023. 56. 1
Abelito F. Belo, K. Shimakawa, Y. Sakaguchi. Transient photodarkening induced by a nanosecond pulsed laser in amorphous and liquid As2Se3: fractal characteristics in relaxation dynamics. Journal of Materials Science: Materials in Electronics. 2022. 33. 28. 22541-22548
Masaaki Akamatsu, Kazuki Kobayashi, Hiroki Iwase, Yoshifumi Sakaguchi, Risa Tanaka, Kenichi Sakai, Hideki Sakai. Rapid controlled release by photo-irradiation using morphological changes in micelles formed by amphiphilic lophine dimers. Scientific Reports. 2021. 11. 1

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MISC (64)：

坂口佳史. アモルファスカルコゲナイドの光誘起構造変化ー光黒化と銀の光拡散ダイナミクスー. 固体物理. 2022. 57. 1. 45-63
河村聖子, 奥隆之, 渡辺真朗, 高橋竜太, 宗像孝司, 高田慎一, 坂口佳史, 石角元志, 大内啓一, 服部高典, et al. 共通試料環境の現状. 日本原子力研究開発機構JAEA-Review(Web). 2018. 2017-031. 21-24 (WEB ONLY)
坂口佳史. 時分割中性子反射率測定によるアモルファスカルコゲナイドへの銀の光拡. 四季(中性子産業利用推進協議会季報). 2018. 38. 春. 7-8
坂口佳史, 高田慎一, 川北至信, 岩瀬裕希, 花島隆泰. 共晶組成における液体Au-Si合金の中性子小角散乱. 日本物理学会講演概要集(CD-ROM). 2017. 72. 2. ROMBUNNO.22pA21-1
川北至信, LI Bing, 川崎卓郎, 菊地龍弥, 鬼柳亮嗣, 稲村泰弘, 大原高志, 柴田薫, 古府麻衣子, 中村充孝, et al. 乱れた構造がもたらす機能発現のメカニズム. 日本中性子科学会年会講演概要集. 2017. 17th. 113

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Books (2)：

“-Nano-ionic nonvolatile memory devices - basic ideas and structural model of rigid Ge-S glasses as medium for them - Chapter 14” in the book in Rigidity and Intermediate Phases in nanomaterials
Publishing company INOE Publ. House 2009
“Chapter 12. Photo-Induced Changes in Liquid Sulfur and Selenium” p.199-219. in “Photo-induced Metastability in Amorphous Semiconductors”
Wiley 2003

Lectures and oral presentations (5)：

Kinetics of silver photodiffusion into amorphous germanium sulfide probed by in situ neutron reflectivity measurement
(Pan Pacific International Symposium on Chalcogenide Functional Materials @Kumamoto 2019)
Kinetics of silver photodiffusion into amorphous Ge chalcogenides probed by neutron reflectivity measurement
(14th International Conference on the Structure of Non-crystalline Materials @Kobe 2019)
Kinetics study on silver photo-diffusion into amorphous germanium sulfide using neutron reflectivity technique
(International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -Informatics in Advanced Measurements and Material Science- @Kumamoto 2018)
Kinetics of silver photo-diffusion into Ge-chalcogenides: review of neutron reflectivity measurement
(Solid State Chemistry 2018 @University of Pardubice, Pardubice, Czech Republic 2018)
Silver photo-diffusion into amorphous Ge chalcogenides - excitation light energy dependence on the kinetics probed by neutron reflectivity
(28th International Conference on Amorphous and Nanocrystalline Semiconductors (ICANS 28) @Palaiseau, France 2019)

Education (3)：

1992 - 1995 Hiroshima University Graduate School of Biosphere Science
1990 - 1992 Hiroshima University Graduate School of Biosphere Science
1986 - 1990 Hiroshima University Faculty of Integrated Arts and Sciences

Professional career (1)：

博士(学術)

Work history (7)：

2017/04 - 現在 Comprehensive Research Organization for Science and Society Neutron Science and Technology Center
2011/02 - 2017/03 Comprehensive Research Organization for Science and Society
2009/02 - 2011/01 Japan Atomic Energy Agency
2007/04 - 2009/02 Boise State University Department of Electrical and Computer Engineering Postdoctoral researcher
2003/06 - 2007/03 Kyoto University Graduate School of Engineering Deprtment of Materical Science and Engineering

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Association Membership(s) (6)：

高分子学会 , 日本高圧力学会 , 固体イオニクス学会 , 日本中性子学会 , 応用物理学会 , 日本物理学会

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