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Synthesis of spherical submicron-sized magnetite/silica nanocomposite particles

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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.

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Author notes

  1. Y. Kobayashi

    Present address: Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University, 4-12-1 Naka-narusawa-cho, Hitachi, Ibaraki, 316-8511, Japan

  2. S. Saeki

    Present address: Inorganic Materials Lab, Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Nagakute-cho, Aichi-gun, Aichi, 480-1192, Japan

Authors and Affiliations

  1. Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki-aza, Aoba-ku, Sendai, 980-8579, Japan

    Y. Kobayashi, S. Saeki, M. Yoshida, D. Nagao & M. Konno

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  1. Y. Kobayashi
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  2. S. Saeki
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  3. M. Yoshida
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  4. D. Nagao
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  5. M. Konno
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Correspondence to M. Konno.

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Kobayashi, Y., Saeki, S., Yoshida, M. et al. Synthesis of spherical submicron-sized magnetite/silica nanocomposite particles. J Sol-Gel Sci Technol 45, 35–41 (2008). https://doi.org/10.1007/s10971-007-1648-1

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  • DOI: https://doi.org/10.1007/s10971-007-1648-1

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