06-P-20 - Controlling the assembly of silica mesoporous materials by varying the decrease in pH

Abstract

Publisher Summary This chapter discusses controlling the assembly of silica mesoporous materials by varying the decrease in pH. The synthesis of mesoporous silicas is performed from an isotropic reaction mixture using cationic surfactant as a structure-directing agent. The decrease in pH, which causes the formation of solid particles, is achieved by the hydrolysis of methyl acetate. The procedure enabled to obtain not only siliceous MCM-41 but also a less well-ordered hexagonal silica with extraordinary large surface area and silica with bimodal mesoporous structure containing the MCM-41 mesopore system and a system of mesopores with a mean diameter of 14 nm.