Abstract
Monolithic composite aerogels have been prepared from silica/boehmite, silica/montmorillonite, silica/mullite and silica/ kaolinite, with 1 and 10 mol% or wt% of the mineral in the final product. The aerogels were sintered at 1000°C for different durations to determine their thermal stability. The various samples lost 50 to 60% of their initial surface area after this treatment but still retained very high surface areas compared to the sintered aerogels prepared from silica only. The incorporation of small amounts of second phases of different morphologies in silica aerogels prevented their densification leading to high surface area materials with high thermal stability.
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