| 摘要 |
Disclosed is a core-shell silica having high sphericity and narrow particle size distribution. Also disclosed is a method for easily producing such a core-shell silica. Specifically disclosed is a method for producing a core-shell silica, which comprises a step for preparing a dispersion liquid by dispersing substantially non-porous silica core particles having a sphericity of not less than 0.8 and a coefficient of variation of not more than 0.2 into a dispersion medium composed of an alcohol and water in the presence of a surface active agent; a step for forming a shell precursor containing silica and the surface active agent on the surface of each silica core particle by adding a silica raw material into the dispersion liquid and causing a reaction of the silica raw material at a pH of 8-13; and a step for forming a porous shell by removing the surface active agent from the shell precursor. ® KIPO & WIPO 2009 |
