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Aerogels of SiO 2 and NiOAl 2 O 3 were prepared by means of sol-gel method followed by supercritical CO 2 drying. Aerogels were characterized in terms of BET surface area, pore size distribution by both nitrogen adsorption and mercury porosimetry, and TEM microscope observation in comparison with xerogels that were prepared by ambient drying of alcogel. Aerogels had...
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