Preparation of silica-coated Co-Fe3O4 nanoparticles and their magnetic properties

被引：8

作者：

Tago, T ^{[1
]}

Hatsuta, T ^{[1
]}

Nagase, R ^{[1
]}

Kishida, M ^{[1
]}

Wakabayashi, K ^{[1
]}

机构：

[1] Kyushu Univ, Dept Chem Engn, Grad Sch Engn, Fukuoka 8128581, Japan

来源：

KAGAKU KOGAKU RONBUNSHU | 2001年 / 27卷 / 02期

关键词：

silica-coated nanoparticle; ferrite; cobalt-modified magnetite; microemulsion; coercivity;

D O I：

10.1252/kakoronbunshu.27.288

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Cobalt-modified magnetite (Co-Fe3O4) nanoparticles coated with silica (SiO2) were prepared by using a water-in-oil microemulsion consisting of polyoxyethylen(15)cetylether, cyclohexene and an aqueous solution of FeCl3 and CoCl2. It is found from TEM observation that the Co-Fe3O4 nanoparticles are located nearly at the center of spherical SiO2 particles, and that the particle size of Co-Fe3O4 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.

引用

页码：288 / 290

页数：3

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