Abstract
The effect of drying, aging and thermal treatment of alumina xerogels prepared by the nonhydrolytic route was investigated using SAXS, BET and HR-SEM techniques. The microstructure of the fresh xerogels prepared under different procedures varied drastically, ranging from aerogel-like mass fractals to narrow pore size distribution materials. By variation of the drying conditions the N2-BET surface area was varied from an immeasurable low level up to 600 m2/g. The initial microstructure has a significant influence on the xerogel behaviour during the post-drying heating stage. The ability to produce aerogel-like mass fractal materials from the nonhydrolytic systems is discussed. Finally, a brief theoretical treatment of the drying process of mass fractals is presented as well.
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De Hazan, Y., Shter, G., Cohen, Y. et al. The Evolution of Microstructure in Nonhydrolytic Alumina Xerogels. Journal of Sol-Gel Science and Technology 14, 233–247 (1999). https://doi.org/10.1023/A:1008713411672
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DOI: https://doi.org/10.1023/A:1008713411672