JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
Particle Technology and Fluidization
Preparation of Silica Microcapsules by Sol-Gel Method in W/O Emulsion
Hideo OnoKoji Takahashi
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1998 Volume 31 Issue 5 Pages 808-812

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Abstract

Spherical silica microcapsules whose average diameter was 3.6 μm were synthesized by the sol-gel method in W/O emulsions containing an anionic surfactant at a high water to surfactant molar ratio. Special agitational conditions are needed to prepare spherical silica microcapsules. The properties of the resulting silica microcapsules were determined by Fourier-transform infrared spectroscopy and scanning electron microscopy. As the spherical silica particles have a hollow core structure, hydrolysis and condensation of TEOS occur at the micellar periphery, and the diameter of the water droplets in the W/O emulsion at a high water to surfactant molar ratio (Wo) are micron sized.

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© 1998 The Society of Chemical Engineers, Japan
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