Preparation of Large Monodispersed Spherical Silica Particles Using Stöber Method

Abstract

To obtain large-sized, monodispersed spherical particles of silica by Sol-Gel, the classic Stöber method was optimized. Effects of the type of solvents，reaction temperature and reaction time on the particle sizes and the particle diameter distribution of silicon dioxide were investigated by scanning electron microscopy (SEM). The results show that the monodisperse silicon dioxide spherical particles with 1.0μm diameter could be obtained in isopropanol solvent under a suitable reaction condition. When the reaction temperature is increased, the silica particle size will decrease. The particle sizes increase first and decrease later as the reaction time passing. The addition method of TEOS has great effects on the morphology and size of silicon dioxide spherical particles.