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- W2027609380 abstract "A wet alumina gel was obtained by cross-linking alumina sol particles from a hydrolyzed aluminum alkoxide with hexamethylene diisocyanate. The alumina gel cross-linked with hexamethylene was supercritically dried in a CO2 extractor. The bulk density of the dried alumina-hexamethylene was one-third that of an alumina aerogel. Boehmite phase was observed in the dried alumina-hexamethylene aerogel. Needle-like texture was observed in the alumina-hexamethylene fired at a temperature of 1200°C for 5 h. The specific surface area of the dried alumina-hexamethylene aerogel was found to be less than that of the alumina aerogel, while its pore sizes were larger. The aerogel had a larger specific surface area after firing at 1200°C for 5 h. This larger surface area was attributed to a θ-phase in the alumina-hexamethylene aerogel, while the alumina aerogel had an α-phase at that temperature. It is concluded that the temperature of the a phase transformation in the alumina-hexamethylene aerogel was higher than in the alumina aerogel. This difference was attributed to the lower packing density resulting from the addition of an organic compound, the existence of boehmite crystallites and the needle-like texture." @default.
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- W2027609380 date "1994-07-01" @default.
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- W2027609380 title "Preparation and properties of alumina-organic compound aerogels" @default.
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- W2027609380 doi "https://doi.org/10.1016/0022-3093(94)90050-7" @default.
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