2018 Fiscal Year Final Research Report

Development of metal nanowire suspension for heat control of high thermal source and their basic properties

Research Project

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Project/Area Number	16H03843
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Nano/Microsystems
Research Institution	The University of Shiga Prefecture
Principal Investigator	Balachandran Jeyadevan 滋賀県立大学, 工学部, 教授 (80261593)
Co-Investigator(Kenkyū-buntansha)	山崎晴彦大阪府立大学, 工学(系)研究科(研究院), 助教 (10780900) 岩本悠宏名古屋工業大学, 工学(系)研究科(研究院), 助教 (30707162) 井門康司名古屋工業大学, 工学(系)研究科(研究院), 教授 (40221775) 山口博司同志社大学, 理工学部, 教授 (80191237)
Project Period (FY)	2016-04-01 – 2019-03-31
Keywords	金属ナノワイヤ / 熱伝導異方性 / 磁性流体 / 銅ナノワイヤ / 銀ナノワイヤ / 磁性ナノ粒子 / ポリオール法 / 溶媒置換
Outline of Final Research Achievements	Non-magnetic particles dispersed in magnetic fluid apparently behave as a diamagnetic body under a magnetic field and form chain-like structure along the magnetic field. This structure leads to an anisotropic thermal conductivity, which is regulated by the intensity and direction of the magnetic field. In this work, the synthesis of the silver nanowires with precisely-controlled shape as well as a high aspect ratio has been successfully achieved by the polyol method. The solvent substitution of the silver nanowire from the polar to nonpolar solvent was also proposed and realized. Furthermore, by dispersing silver nanowires in the magnetic fluid at a low concentration of 0.11 vol.%, a change of ± 7% in thermal conduction was realized depending on the direction of the applied magnetic field. The above observed physical phenomena was explained experimentally, numerically and theoretically.
Free Research Field	材料科学，界面化学，流体工学，伝熱工学，電磁気学，磁性流体力学，数値流体力学
Academic Significance and Societal Importance of the Research Achievements	新たな金属ナノワイヤ分散磁気機能性流体と熱伝導，熱流制御技術の開発という極めて重要な工学的応用を提案した。これは，材料科学，界面化学，流体工学，伝熱工学，電磁気学，磁性流体力学，数値流体力学などの分野横断型・複合領域研究であり，学術における新たな横断的・学際的な分野を開拓した。本研究の遂行により，流体の熱伝導率を外場で制御する技術を確立し，その物理現象を明らかにするとともに，小型集積回路などの高精度・高性能熱輸送や蓄熱・放熱技術，精密熱流制御技術などへの工学応用の可能性を見出した。