Controlled Porous Silica Structures Using Template Methods

抄録

Polystyrene (PS) particles have been used as templates to produce porous silica structures. Silica films were grown on the surface of the PS (diameter: 500 and 1000 nm) by adsorbing fine silica particles, which are synthesized by a hydrolysis of tetraethoxy silicate (TEOS). The size of hydrolyzed silica particles, which was determined by a dynamic light scattering (DLS), was ca. 3 nm. The coated PS spheres were characterized using TEM and SEM. The film reached a maximum film thickness. The coated particles were close-packed by centrifuge. Calcination of the compact yielded a continuous matrix consisting of a well-ordered network. The shape of the pore was hexagonal when the particles of the same size was used, and was nonagonal when the close-packed bodies, which was produced by the coated particles of 500 and 1000 nm, were sintered.