Preparation of Silica-Coated Co-Fe3O4 Nanoparticles and their Magnetic Properties

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

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9 Citations (Scopus)


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 FeCl2 and C0Cl2. 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 incrasing amount of Co added. Key words: silica-coated nanoparticle, ferrite, cobalt-modified magnetite, microemulsion, coer-civity.

Original languageEnglish
Pages (from-to)288-290
Number of pages3
Journalkagaku kogaku ronbunshu
Issue number2
Publication statusPublished - Jan 1 2001

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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