Synthesis of spherical submicron-sized magnetite/silica nanocomposite particles |
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| Authors: | Y Kobayashi S Saeki M Yoshida D Nagao M Konno |
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| Institution: | (1) Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki-aza, Aoba-ku, Sendai 980-8579, Japan;(2) Present address: Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University, 4-12-1 Naka-narusawa-cho, Hitachi, Ibaraki 316-8511, Japan;(3) Present address: Inorganic Materials Lab, Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Nagakute-cho, Aichi-gun, Aichi 480-1192, Japan |
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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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| Keywords: | Particle Magnetite Silica Composite Surface-modification St?ber method |
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