Patent ID: 9080056
Filing Date: 2015-07-14
Classification: B01J,C01B,C01P,C09C

Abstract:
1. A process for preparing silica core-shell microparticles comprising the steps of: a) growing a porous silica shell from a silica precursor onto the surface of non-porous silica particle dispersed in a mixed surfactant solution under basic pH conditions, b) hydrothermally treating the particles of (a) in an oil-in-water emulsion system; and c) calcining the particles of (b) to remove residual surfactants, wherein step (a) is repeated at least once to achieve a silica core-shell particle with an ordered mesoporous layered shell, wherein the mixed surfactant comprises a cationic surfactant of an alkyl trimethylammonium comprising the formula: wherein: n is an integer between 12 and 20; and a non-ionic surfactant of the formula: wherein: x is an integer between 5 and 106; and