Self-assembly and magnetization distribution of colloidal magnetic particles: direct TEM observations

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14152
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Kyushu University
• Principal Investigator: Murakami Yasukazu 九州大学, 工学研究院, 教授 (30281992)
• Co-Investigator(Renkei-kenkyūsha): AKASE Zentaro 東北大学, 多元物質科学研究所, 講師 (90372317) ; NIITSU Kodai 理化学研究所, 創発物性科学研究センター, 特別研究員 (90733890)
• Research Collaborator: OSHIMA Yoshifumi 北陸先端科学技術大学院大学, 先端科学技術研究科, 准教授 (80272699) ; KRISHNAN Kannan M. University of Washington, Department of Materials Science and Engineering, Professor ; ONISHI Ichiro 日本電子株式会社, EM事業ユニット, リーダー ; KASUYA Daisuke 日本電子株式会社, フィールドソリューション事業部, 主事
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 磁性微粒子 / 自己組織化 / 電子顕微鏡 / コロイド / その場観察

Outline of Final Research Achievements

The aim of this study is to understand the basic mechanisms of self-assembly of magnetic nanoparticles dispersed in liquid, with the aid of in-situ transmission electron microscopy (TEM) observations. Collaborating with a research group of Univ. Washington (Prof. Krishnan), we have chosen a solvent that is favorable for TEM studies. The self-assembly of magnetite nanoparticles was observed in two conditions, with and without applied magnetic field. The direct observations demonstrated an essential role of magnetic dipolar interaction in the self-assembly. Brownian motion of the nanoparticles was significant in the colloidal phase.

Free Research Field

材料科学