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Nitrogen and Water Sorption Properties of Ethyl-Substituted Silica Aerogels and Xerogels

Published online by Cambridge University Press:  28 February 2011

Chunling Liu
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802.
Sridhar Komarneni
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802. Also with the Department of Agronomy
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High surface area ethyltrimethoxysilane (ETMS) modified silica aerogels and xerogels were synthesized by cohydrolyzing the mixtures of ETMS and tetramethylorthosilicate (TMOS). The effects of ETMS content, pH value and solvent addition were investigated. The surface area, pore structure and hydrophobicity were studied using nitrogen and water sorption measurements. By ETMS modification of TMOS gels, high surface area, density and hydrophobicity were achieved. The 25 mole% ETMS-75 mole% TMOS was found to be the best composition for both aerogel and xerogel, which are hydrophobic and have surface areas of 1221 and 832 m2/g, respectively.

Research Article
Copyright © Materials Research Society 1995

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