Preparation of core-shell SiO2/Fe3O4 nanocomposite particles by reverse microemulsion

Bing Liu, Deping Wang, Aihua Yao, Wenhai Huang, Masanobu Kamitakahara, Koji Ioku

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Core-shell structural SiO2/Fe3O4 nanocomposite particles were prepared via hydrolysis and condensation of tetraethyl orthosilicate (TEOS) by using Fe3O4 nanoparticles as seeds in a Triton X-100/hexanol/cyclohexane/water reverse microemulsion system. The effects of the mass concentration of Fe3O4, the mole ratio of water to Triton X-100 (ω0) and the mass concentrations of NH4OH and TEOS on SiO2/Fe3O4, nanocomposite particles were investigated. The results show that mass concentration of Fe3O4 has an effect on the core number and appearance of the nanocomposite particles. The mass concentrations of NH4OH and ω0 are the main factors of the SiO2 heterogeneously growing on the Fe3O4 nuclei surface. The SiO2 shell becomes thicker and the particle morphology becomes more uniform with the increase of TEOS mass concentration. The saturation magnetization of the nanocomposite particles decrease with the increase in the thickness of the silica shell, the coercive force of the nanocomposite particles is almost unchanged, and remained favorable to superparamagnetism.

Original languageEnglish
Pages (from-to)569-574
Number of pages6
JournalKuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society
Volume36
Issue number4
Publication statusPublished - 2008 Apr 1
Externally publishedYes

Keywords

  • Core-shell structure
  • Magnetite
  • Reverse microemulsion
  • Silica

ASJC Scopus subject areas

  • Ceramics and Composites
  • Inorganic Chemistry
  • Materials Chemistry

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