Carbon Deposition on Volatile Evolution in Chemically Polymerized Silica

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Abstract
Conditions of carbon deposition via break-down of ethyl alcohol during its evaporation out of ethoxysilanol gels were studied. In the heat-treatment step for gel-glass conversion, the heating rate in the temperature range of 150°-200°C was found to be critical for the decomposition of alcohol and deposition of carbon. It was inferred from the obtained information that the break-down reaction of alcohol, occurring in this temperature range, was an initiating, rather than a precursory step of carbon formation. Some possible break-down reactions were enumerated and one of the likely routes to carbon formation was indicated.

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