Synthesis of spherical submicron-sized magnetite/silica nanocomposite particles

Y. Kobayashi, S. Saeki, M. Yoshida, Daisuke Nagao, Mikio Konno

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


This paper describes a method for fabricating spherical submicron-sized silica particles that contained magnetite nanoparticles (magnetite/silica composite particles). The magnetite nanoparticles with a size of ca. 10 nm were prepared according to the Massart method, and were surface-modified with carboxyethylsilanetriol. The fabrication of magnetite/silica composite particles was performed in water/ethanol solution of tetraethoxyorthosilicate with ammonia catalyst in the presence of the surface-modified magnetite nanoparticles. The magnetite/silica composite particles with a size of ca. 100 nm were successfully prepared at 0.05 M TEOS, 15 M water, and 0.8 M ammonia with injection of the magnetite nanoparticle colloid at 2 min after the initiation of hydrolysis reaction of TEOS. Magnetite concentration in the composite particles could be raised to 17.3 wt.% by adjustment of the injected amount of the magnetite colloid, which brought about the saturation magnetization of 7.5 emu/g for the magnetite/silica composite particles.

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalJournal of Sol-Gel Science and Technology
Issue number1
Publication statusPublished - 2008 Jan 1


  • Composite
  • Magnetite
  • Particle
  • Silica
  • Stöber method
  • Surface-modification

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry


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