Silica gels were prepared by the hydrolysis of silicon tetrachloride in pure water or in a tetrahydrofuran/water solution; hydrolysis in an ammonia/water solution yielded precipitated silica. After solvent transfer in acetone followed by supercritical point drying using liquid carbon dioxide, aerogel powders with high surface areas (up to 900 m2/g) and low tapping densities (down to 0.040 g/cm3) were produced. The powders were characterised by transmission electron microscopy, thermogravimetric analysis and infrared spectroscopy. © 1995, All rights reserved.
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