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Hydrolysis and Condensation of Alkyltrimethoxysilanes in Monomolecular Films |
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| Authors: | Johan Sjöblom Hege Ebeltoft Alf Bjørseth Stig E. Friberg Chris Brancewicz |
| Affiliation: | 1. Department of Chemistry , University of Bergen , Bergen, N-5007, Norway;2. Elkem A/S , PO Box 4282, Torshov, N-0401, Norway;3. Center for Advanced Materials Processing, Clarkson University , Potsdam, New York, 13699-5814, U.S.A. |
| Abstract: | Hydrolysis and condensation of monomolecular alkyloxysilane films by the Langmuir technique is presented. Octadecyltrimethoxysilane formed monolayers on aqueous subphases with different properties depending on the bulk pH. At pH 1 a solid condensed film was directly formed with a molecular area of 23 Å2 and a surface pressure/surface area variation similar to that on non-ionized stearic acid. At pH 5.6 and 11 several phase transitions were observed during the compression of the monolayer with a final collapse at a molecular area of 20 Å2. Relaxation measurements confirmed the stability of the films for longer than 12 hours at different surface pressures below a critical value. |
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