Abstract
Optically transparent, hexagonally organized mesoporous silica films with variable thickness have been synthesized from aqueous solutions of tetrakis(2-hydroxyethyl)orthosilicate (EGMS) in the presence of an amphiphilic structure-directing agent (Pluronic P123). Two different methods for film formation have been compared: spin coating from a highly concentrated and viscous precursor solution comprising EGMS, P123 and water/HCl via a direct templating of a preformed LC phase and spin coating from diluted solutions in tetrahydrofuran, thus following a cooperative self-organization process induced by solvent-evaporation. The influence of processing parameters such as pH-value, concentration of the precursors as well as aging of the sol on the periodic mesostructure is investigated.
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