Satoshi KOIZUMIProfessor
■Researcher basic information
Organization
Educational Background
Career
Message from Researchers
(Message from Researchers)
工学部高分子化学科に学び、透過型電子顕微鏡によるジブロック共重合体のミクロ相分離構造の研究で学位を取得. その後、原子力機構にて中性子小角散乱法および散乱装置の開発に従事、2011年より茨城大学工学部で基礎物理や高分子材料の教育に関わる. 担当する授業科目は、統計力学、熱力学、量子力学、高分子材料学、放射線科学など. 2023年より総合科学研究機構 中性子産業利用推進センター（副センター長）を兼務して中性子産業利用を推進
■Research activity information
Paper
- 中性子全反射法による固体表面の組成分析 : ゴムの固着と劣化のその場観察を目指して (特集 ソフトマターの試験・評価技術)
小泉 智; 麻生 脩平; 前田 知貴; 上野 真寛; 仲摩 雄季; 武山 慶久, メカニカル・テック社
Soft matter = ソフトマター : "やわらかい物質"と計測・評価の技術情報誌, 2020, [Reviewed] - 市販の製品そのものの評価が可能な量子線顕微装置 : 動的核スピン偏極コントラスト変調による中性子小角散乱 (特集 ソフトマターの計測・評価技術)
小泉 智; 能田 洋平; 前田 知貴, メカニカル・テック社
Soft matter = ソフトマター : "やわらかい物質"と計測・評価の技術情報誌, 2020, [Reviewed] - 中性子線と分割電極セルの組合せによる固体高分子形燃料電池の水計測技術
UEDA Satoru; EGUCHI Mika; KOBAYASHI Yoshio; TSUTSUMI Yasuyuki; PUTRA Ananda; YAMAGUCHI Daisuke; KOIZUMI Satoshi, Small-angle neutron scattering (SANS) is a powerful technique to visualize the swelling behavior of a polymer electrolyte membrane (Nafion) during cell operation. Using a small incident beam with 10 mm in diameter, we monitored the inhomogeneous swelling and ion-cluster size distribution in a membrane along a serpentine gas flow channel as a function of current density. To determine the local cell voltage, corresponding to SANS observation, we developed a segmented electrode that was incorporated in a shunt resistance circuit. Using the segmented electrode, we quantitatively determined local cell resistance and cell voltage during operation., The Society of Polymer Science, Japan
Kobunshi Ronbunshu, Mar. 2013, [Reviewed] - Nanoscale structures of radiation-grafted polymer electrolyte membranes investigated via a small-angle neutron scattering technique
SAWADA Shin-ichi; YAMAGUCHI Daisuke; PUTRA Ananda; KOIZUMI Satoshi; MAEKAWA Yasunari, Nature Publishing Group
Polymer Journal, 2013, [Reviewed] - Magnetic ordering of spin systems having fractal dimensions,Experimental study
Eur. Phys. J. B, 2013, [Reviewed] - Hierarchical Structure Analysis of Graft-Type Polymer Electrolyte,Membranes Consisting of Cross-Linked Polytetrafluoroethylene by,Small-Angle Scattering in a Wide‑Q Range
Hiroki Iwase; Shin-ichi Sawada; Tetsuya Yamaki; Satoshi Koizumi; Masato Ohnuma; Yasunari Maekawa, Small-angle scattering in a wide-Q range (4 x 10(-3) to 1.5 nm(-1)) of polymer electrolyte membranes consisting of poly(styrenesulfonic acid) and cross-linked polytetrafluoroethylene (cPTFE-PEM) with various grafting degrees up to 36% was observed by focusing small-angle neutron scattering (FSANS), small-angle neutron scattering (SANS), and small-angle X-ray scattering (SAXS). The hierarchical structure of the PEM was characterized as being composed of conducting layers (graft domains) in lamellar stacks with 48-57 nm spacing on the surfaces of 480 nm diameter crystallites and ultrasmall structures with 1.7 nm correlation distance of the sulfonic acid groups in the conducting layers. The PEMs with grafting degrees less than 15% possessed only grafting domains in the amorphous layers of the lamellar stacks of cPTFE. An increase in the grafting degree up to 5% led to an increase in the lamellar spacing of 20%, while the lamellar spacing remained constant with grafting degrees above 5% because of crystalline restriction. Moreover, with grafting degrees of greater than 15%, grafting domains were phase separated from the cPTFE substrate and covered the crystallites with a diameter of 480 nm (the length of a crystallite is above the observed Q region (>1.6 mu m). The graft domains around the crystallites were connected with the adjoining domains; accordingly, the PEMs with a higher degree of grafting had conductivity higher than that of Nafion. Furthermore, in the SAXS measurement, the nano order internal structure (1.7 nm) corresponded to the distance between the sulfonic acid groups of the graft polymers in the conducting layers of the cPTFE-PEM. The nano order correlation distances of the sulfa groups, which cannot be observed in Nafion, should result in methanol and water crossover levels lower than those in Nafion., AMER CHEMICAL SOC
Macromolecules, 2012, [Reviewed] - Preirradiation Graft Polymerization of Styrene in a Poly(tetrafluoroethylene) Film Investigated by Time-Resolved Small-Angle Neutron Scattering
Hiroki Iwase; Shin-ichi Sawada; Tetsuya Yamaki; Yasunari Maekawa; Satoshi Koizumi, Preirradiation graft polymerization of styrene in a poly(tetrafluoroethylene) (PTFE) film was examined by time-resolved small-angle neutron scattering (SANS). A crosslinked PTFE film, thickness of which is about 50 mu m, was irradiated by gamma-ray and immersed in a mixed solvent of styrene monomer and toluene. SANS elucidated that graft polymerization proceeds by two reaction processes (I) and (II). In process (I) at 0 < t < 200 min, graft polymerization occurs at an interface between crystalline and amorphous PTFE domains and the grafted polystyrene segregates from PTFE, forming a thin layer with a sharp interface. In process (II) at 200 < t < 600 min, grafted PS layer starts to bridge between crystalline domains. At the end of process (II), 40% of total crystalline PTFE domain is covered by the grafted PS chains., HINDAWI PUBLISHING CORPORATION
INTERNATIONAL JOURNAL OF POLYMER SCIENCE, 2011, [Reviewed]
MISC
- 入門講座 原子炉における小角散乱装置
日本中性子科学会誌「波紋」, May 2014, [Reviewed] - Small-Angle Neutron Scattering at Reactor and Spollation Sources
KOIZUMI Satoshi
The Journal of Japan Institute for Interconnecting and Packaging Electronic Circuits, Jul. 2012
Books and other publications
Lectures, oral presentations, etc.
- In-situ Observation of Polymer Electrolyte Fuel Cell (PEFC) by Neutron Small-Angle Scattering with Contrast Variation by Using Deuterium Gas
SAS2012 (Sydney), 22 Nov. 2012, [Invited] - In-situ Observation of Operating Polymer Electrolyte Fuel Cell (PEFC) by Neutron Small-Angle Scattering - Contrast Variation by Using Deuterium Gas -
JCNS Workshop 2012 (Trends and Perspectives in Neutron Scattering for Soft Matter and Biophysics), 08 Oct. 2012
Courses
Research Themes
- Systematization of Kansei evaluation to connect sustainable materials (fibers / yarns) and textile products
Grant-in-Aid for Scientific Research (B)
Kobe University
01 Apr. 2022 - 31 Mar. 2026 - Investigation of the functional prediction of polymer materials base on informatics and structural data
Grant-in-Aid for Scientific Research (A)
National Institutes for Quantum and Radiological Science and Technology
Apr. 2018 - Mar. 2022 - Development and application of a neutron polarizing and focusing system based on magnetic field gradients
Grant-in-Aid for Scientific Research (B)
Japan Atomic Energy Agency
2008 - 2010 - Structure Formation and Molecular Motion of Temperature-Responsive Telechelic Associating Polymers
Grant-in-Aid for Scientific Research (B)
Kyoto University
2007 - 2010 - Study on volume phase transition of gels induced by helix-coil transition
Grant-in-Aid for Scientific Research (C)
Kyoto University
2003 - 2004
