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Meso-Ordered Silica Films Formed by Sugar-Based Surfactants

Published online by Cambridge University Press:  01 February 2011

Uraka Lavrenèiè-Štangar
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/ 165, A- 1060 Vienna, Austria
Michael Puchberger
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/ 165, A- 1060 Vienna, Austria
Nicola Hüsing
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/ 165, A- 1060 Vienna, Austria
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Abstract

Sugar-based amphiphilic molecules are used as templates in the sol-gel processing of thin silica films. The films are prepared relying on solvent evaporation-induced self-assembly during dip-coating in a humidity controlled chamber. Different surfactants, such as the commercially available alkyl glycosides (e.g. n-octyl β-D-glucopyranoside and n-dodecyl β-D-maltopyranoside), are compared with respect to their ability to cooperatively self-assemble in alcoholic silicate solutions. The larger polar headgroup (maltose) decreases the critical packing parameter and thus beneficially influences the formation of a favorable hexagonal phase over the lamellar phase, which is formed with the glucose-based surfactant. The inorganic-organic composite films show a strong influence on the humidity during their synthesis. For nonstructured films, ordering could be achieved by exposing the as-deposited films to a high humidity for several hours. The final material is characterized by X-ray diffraction, nitrogen sorption and solid state NMR techniques.

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Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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