Zirconia-Based Aerogel

Very recently, hierarchically arranged aerogel monoliths [209], silica-based monoliths from swollen liquid crystals [210] or heptane/water/ethanol/sodium dodecylsulfate microemulsion [211], monolith-based hybrid components such as the PMOs [212], and silicon oxycarbide monoliths with better thermal properties than the pure (organo) silica monoliths [213] have been reported. These approaches have been extended also to alumina or aluminumsilicates [214, 215], titania [216, 217], zirconia [218], or ceramic-based [219] systems. 

Mesoporous aerogels based rai sidfated zirconia doped with chromium have been synthesized by sol-gel method and dried in supercritical conditions of the solvent by Ghorbel et al. [45]. The characterization results revealed that Zr02 tetragonal phase is stabilized by both sulfate groups and metal at high temperature. The physisorption of N2 showed that the sol-gel procedure coupled to the drying under supercritical conditions of the... 

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