Composite Silica Particles Using a Mixture of Organosilane Monomers

Author: Han Dong   Hah Hoe   Park Hong-Woo   Koo Sang  

Publisher: Springer Publishing Company

ISSN: 0928-0707

Source: Journal of Sol-Gel Science and Technology, Vol.32, Iss.1-3, 2004-12, pp. : 47-51

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Abstract

Composite silica particles were synthesized by a two-step (acid-base) process in an aqueous solution with a mixture of organoalkoxysilane monomers. The two-step process separates the hydrolysis and condensation procedures to easily control condensation rate. In this study, the silane monomers used were phenyltrimethoxysilane (PTMS), vinyltrimethoxysilane (VTMS), methyltrimethoxysilane (MTMS), and tetraethyl-orthosilicate (TEOS). The physical properties of the resultant composite particles were investigated with the change in the molar ratio of monomers. The size of the particles increased with increasing the molar ratio of RaSi(OR)3/RbSi(OR)3 or RaSi(OR)3/TEOS (Ra: phenyl; Rb: vinyl, methyl).