Abstract
Large facetted hollow silica vesicles were synthesized by directed growth of silica on equilibrium icosahedrally facetted catanionic vesicles, made from cetyltrimethylammonium hydroxide/myristic acid surfactant bilayers. Three critical parameters were identified: (i) the surface charge of the vesicles; (ii) the rate of silica deposition by tetraethoxysilane (TEOS) hydrolysis and (iii) the rate of concomitant ethanol production. All three factors are pH-dependent. Thus, depending on the reaction pH and TEOS concentration, the silica vesicles have been shown to be either facetted, rounded or damaged, in a process controlled by the template.
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