X-ray Diffraction Study of Mesophase
Bitemplate-Containing Silicas

E. I. Oranskaya^a and N. A. Yaroshenko^b

^a Institute of Surface Chemistry, National Academy of Sciences of Ukraine, Kiev, 03164 Ukraine

e-mail: oranska@visti.com

^b Institute of Sorption and Problems of Endoecology, National Academy
of Sciences of Ukraine, Kiev, 03164 Ukraine

Received October 17, 2007

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. Alkylpyridin-
ium halides (C_nPyHal with n = 8–16 (counterion Cl) and 18 (counterion Br)) were used a solubilizator, and
monoethanolamides (EAC_m) of saturated n-aliphatic acids (m = 10–16) and trialkylphosphine oxides
(H_2e+1C_e)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 orga-
nization, and the solubilizator and solubilizate concentrations.

PACS numbers: 61.43.Gt

DOI: 10.1134/S1063774508050246

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