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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We thank C. Egger for nitrogen sorption measurements. JK acknowledges financial support from the EC NMP-CT-2005-515846 (NAPOLYDE).
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Köhler, J., Feinle, A., Waitzinger, M. et al. Glycol-modified silanes as versatile precursors in the synthesis of thin periodically organized silica films. J Sol-Gel Sci Technol 51, 256–263 (2009). https://doi.org/10.1007/s10971-009-1947-9
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DOI: https://doi.org/10.1007/s10971-009-1947-9