| abstract |
The disclosure provides a process for preparing the functionalized hollow silica particles comprises: providing a core-shell silica particle comprising a template core particle and a silica treatment, wherein the core-shell silica particle has an outer surface; and wherein the silica treatment is prepared using a water-based silica precursor; creating a functionalized surface on the core-shell silica particle, wherein the functionalized surface is prepared using sulfonic acid, phosphonic esters, carboxylic acid, amines, epoxides, or boronic acids, and removing the template core particle to form a functionalized hollow silica particle. These inorganic hollow particles are useful as hiding or opacifying agents in coating and molding compositions. They are also useful as photonic band gap or thermal insulation materials. |