Synthesis of a polysilazane layer on silica gel by chemical surface coating
- 1 January 1996
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 92 (21) , 4285-4289
- https://doi.org/10.1039/ft9969204285
Abstract
Thermally pretreated silica gel has been modified with SiCl4 and NH3. Repeating this treatment gives rise to a polysilazane layer, chemically bonded to the silica gel surface. Using FTIR, N and Cl determinations and gravimetric analysis, a total characterization of the polysilazane layer was obtained, together with quantification of the different reactions occurring. The parameters of the reaction cycles have been optimized in such a way, that a high density of silazanes (Si—NH—Si) is reached at the silica surface. The influence of the modification process upon the porosity of the silica gel was also studied.Keywords
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