シリカで包接されたコバルト修飾マグネタイトナノ微粒子の調製とその磁気特性

多湖 輝興; 初田 隆俊; 長瀬 亮; 岸田 昌浩; 若林 勝彦

doi:10.1252/kakoronbunshu.27.288

Materials and Devices

Preparation of Silica-Coated Co-Fe304 Nanoparticles and their Magnetic Properties

Teruoki Tago, Takatoshi Hatsuta, Ryo Nagase, Masahiro Kishida, Katsuhiko Wakabayashi

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Keywords: silica-coated nanoparticle, ferrite, cobalt-modified magnetite, microemulsion, coercivity

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2001 Volume 27 Issue 2 Pages 288-290

DOI https://doi.org/10.1252/kakoronbunshu.27.288

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Abstract

Cobalt-modified magnetite (Co-Fe304) nanoparticles coated with silica (Si02) were prepared by using a water-in-oil microemulsion consisting of polyoxyethylen (15) cetylether, cyclohexene and an aqueous solution of FeCl2 and CoC12. It is found from TEM observation that the Co-Fe304 nanoparticles are located nearly at the center of spherical Si02 particles, and that the particle size of Co-Fe304 is very uniform (ca. 14-17 nm). The coercivity of the nanoparticle increases from 1.17 kA/m to 58.9 kA/m with increasing amount of Co added.

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