Journal of Sol-Gel Science and Technology

, Volume 45, Issue 1, pp 35–41

Synthesis of spherical submicron-sized magnetite/silica nanocomposite particles

  • Y. Kobayashi
  • S. Saeki
  • M. Yoshida
  • D. Nagao
  • M. Konno
Original Paper

DOI: 10.1007/s10971-007-1648-1

Cite this article as:
Kobayashi, Y., Saeki, S., Yoshida, M. et al. J Sol-Gel Sci Technol (2008) 45: 35. doi:10.1007/s10971-007-1648-1

Abstract

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.

Keywords

Particle Magnetite Silica Composite Surface-modification Stöber method 

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Y. Kobayashi
    • 1
    • 2
  • S. Saeki
    • 1
    • 3
  • M. Yoshida
    • 1
  • D. Nagao
    • 1
  • M. Konno
    • 1
  1. 1.Department of Chemical Engineering, Graduate School of EngineeringTohoku UniversityAoba-ku, SendaiJapan
  2. 2.Department of Biomolecular Functional Engineering, College of EngineeringIbaraki UniversityHitachi, IbarakiJapan
  3. 3.Inorganic Materials LabToyota Central R&D Labs., Inc.Aichi-gun, AichiJapan

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