SILICA CORE-SHELL MICROPARTICLES

摘要

Hybrid silica core - shell microparticles are prepared by growing a porous hybrid silica shell from a mixed silica precursor comprising an alkoxy silica precursor and an organic alkoxy silane precursor onto the surface of non- porous silica particles dispersed in a stabilizing mixed surfactant solution under basic pH conditions, the growth step is repeated a plurality of times. The microparticles are hydrothermally treated in an oil-in-water emulsion system and residual surfactant is removed by calcination or extraction. The final pore diameter of the microparticles is increased by controlled dissolution in an acidic or basic solution.