Physicochemical features of the formation of siliceous porous mesophases -2. Effect of the size of the surfactant cation

The formation of siliceous mesoporous mesophase materials (SiO2-MMM) prepar ed by precipitation of soluble forms of SiO2 with alkyltrimethylalkylammoni um bromide C(n)TMABr (n = 12, 14, 16, 18 is the number of carbon atoms in t he alkyl chain) was investigated. An increase in the n value has no influen ce on the mechanism of formation of SiO2-MMM but causes an increase in the size and volume of mesopores with the mesopore specific surface area and wa ll thickness remaining virtually constant.