X-ray diffraction study of mesophase bitemplate-containing silicas

Abstract

The effect of the composition of a bitemplate (solubilization) mixture on the formation of a spatially organized structure of mesophase siliceous systems has been investigated by X-ray diffraction. Alkylpyridinium halides (CnPyHal with n = 8−16 (counterion Cl) and 18 (counterion Br)) were used a solubilizator, and monoethanolamides (EACm) of saturated n-aliphatic acids (m = 10−16) and trialkylphosphine oxides (H2e + 1Ce)3PO, where e = 8, 10, or 12, were used as solubilizates. Differences in the mesophase structure of template-containing silicas synthesized in aqueous and aqueous salt (NaCl) solutions have been revealed. It is shown that the type and degree of ordering of the silica mesophase structure depends on the nature, spatial organization, and the solubilizator and solubilizate concentrations.