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Generalized Syntheses of Periodic Surfactant/Inorganic Composite Materials
Technical rept. 1 Jun 1993-31 May 1994
CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY
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Here we demonstrate a generalized approach to describe the synthesis of transition and other metal oxide mesophases with cationic and anionic surfactants under variable conditions of pH. We show that tailoring the metal- ion speciation and charge density results in cooperative assembly by electrostatic complementarity at the inorganicorganic interface. Two general synthetic pathways are described direct co-condensation with surfactants of opposite charge and indirect co-condensation of similary charged species mediated by the intercalation of counterions at the surfactantinorganic interface. The latter route has been used to produce, for the first time, organized periodic porous silica structures at room temperature in concentrated acid solution.
APPROVED FOR PUBLIC RELEASE