Novel synthesis of silica-coated ferrite nanoparticles prepared using water-in-oil microemulsion

Teruoki Tago, Takatoshi Hatsuta, Kanta Miyajima, Masahiro Kishida, Shizuka Tashiro, Katsuhiko Wakabayashi

Research output: Contribution to journalArticle

129 Citations (Scopus)

Abstract

Ferrite nanoparticles (magnetite (Fe3O4) and cobalt-ferrite (CoxFe3-xO4)) coated with silica (SiO2) were prepared using water-in-oil microemulsion of a polyoxyethylen(15)cetylether/cyclohexene system. Observation via transmission electron microscopy revealed that the ferrite nanoparticles were located nearly at the center of spherical SiO2 particles. The sizes of Fe3O4 and CoxFe3-xO4 nanoparticles were in the range of 8-12 nm and 10-14 nm, respectively, and the thickness of the SiO2 layer was ∼ 14.0 nm. The solid solution of cobalt ions into Fe3O4 to form CoxFe3-xO4 nanoparticles led to an increase in the coercivity of the SiO2-coated ferrite nanoparticles. The coercivity increased with increasing amounts of added cobalt, obtaining a maximum value of 780 Oe around a Co/Fe ratio of 0.3-0.4.

Original languageEnglish
Pages (from-to)2188-2194
Number of pages7
JournalJournal of the American Ceramic Society
Volume85
Issue number9
DOIs
Publication statusPublished - Jan 1 2002

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ferrite
Microemulsions
Silicon Dioxide
Ferrite
Oils
silica
Silica
Nanoparticles
Cobalt
Water
cobalt
oil
Coercive force
Magnetite Nanoparticles
Magnetite nanoparticles
water
Solid solutions
solid solution
Ions
transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

Novel synthesis of silica-coated ferrite nanoparticles prepared using water-in-oil microemulsion. / Tago, Teruoki; Hatsuta, Takatoshi; Miyajima, Kanta; Kishida, Masahiro; Tashiro, Shizuka; Wakabayashi, Katsuhiko.

In: Journal of the American Ceramic Society, Vol. 85, No. 9, 01.01.2002, p. 2188-2194.

Research output: Contribution to journalArticle

Tago, Teruoki ; Hatsuta, Takatoshi ; Miyajima, Kanta ; Kishida, Masahiro ; Tashiro, Shizuka ; Wakabayashi, Katsuhiko. / Novel synthesis of silica-coated ferrite nanoparticles prepared using water-in-oil microemulsion. In: Journal of the American Ceramic Society. 2002 ; Vol. 85, No. 9. pp. 2188-2194.
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