Preparation of magnetite nanoparticles coated with silica via a sol-gel approach

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

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13 Citations (Scopus)

Abstract

Silica-coated magnetite nanoparticles were synthesized via sol-gel process, which comprises the hydrolysis and condensation of TEOS in ethanol/water solution with NH3 aq. as catalyst. Transmission electron microscope and vibrating sample magnetometer was applied to characterize the nanocomposite particles. Results reveal that the reaction parameters including volume ratio of alcohol/water, the concentrations of NH3 aq and TEOS play important roles of the formation of silica shell. The thickness of silica shell increased with TEOS concentration. The nanocomposite particles remained favorable superparamagnetism. The formation of silica shell mainly came from the aggregative growth of silica primary particles on the surface of magnetite nanoparticles.

Original languageEnglish
Pages (from-to)877-881
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume115
Issue number1348
DOIs
Publication statusPublished - 2007 Dec
Externally publishedYes

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Keywords

  • Magnetite
  • Nanoparticle
  • Sol-gel

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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