Preparation of silica particles by sol-gel process in reverse suspension

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Sol-gel process of silicon alkoxide was performed in reverse suspension to limit the sites of hydrolysis and dehydration-condensation of alkoxide to the inside of the dispersed droplets and to prepare silica particles of tens μm in diameter. Acetic acid aqueous solution was used as a dispersed phase and hexane as a continuous phase. The dispersed phase was poured into the continuous phase in which silicon alkoxide has dissolved with stirring to form a reverse suspension. Silica particles of 67 μm in mean diameter were obtained by calcining the gel particles produced. Effects of pH of the dispersed phase and concentration of dispersion stabiliser on the characteristics of the silica particles were discussed. The formation mechanism of the gel particle was inferred with applying Jander's model which is often used to analyse solid phase reaction of particles.

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