Preparation of spherical silica particles in reverse micro emulsions using silicon tetrachloride as precursor

► We prepared amorphous and spherical silicas using SiCl4 in emulsion system. ► The structure of silica was stable after heating under 600 °C. ► Lower mole ratio of water and SiCl4 caused smaller silica particles. ► Thermal properties and phase of silicas prepared from different emulsion system were similar