Preparation and Properties of Hydrophobic Silica Aerogels by Ambient Pressure Drying Method

Abstract:

Silica alcogels were prepared by hydrolysis with hydrochloric acid and condensation with NH₄OH of ethanol diluted tetraethylorthosilicate (TEOS) precursor and trimethylchlorosilane and hexane as surface modifying agent. The physical properties such as density, appearance, hydrophobicity, surface area, pore size distribution and thermal stability were measured. It was found that the physical and hydrophobic properties of the silica aerogels depend on the TMCS/hexane (V) volume ratio. The density decreased with increase of V, and the aerogels are more hydrophobic as V=3%. The aerogels were thermally stable up to a temperature of 350 °C, and the aerogel prepared has a high surface area and large pore volume.

• Periodical: Applied Mechanics and Materials (Volumes 71-78)
• Pages: 1040-1043
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.71-78.1040
• Online since: July 2011
• Authors: Hui Wang, Shi Ming Liu, Ling Ke Zeng
• Keywords: Hydrophobic, Porous Structure, Silica Aerogels, Surface Modification

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DOI: 10.1016/s0022-3093(05)80435-1

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