Surface Modification of Silica Aerogels Dried with 2-Methyl-1-Propanol in the Sub-Critical Pressure |
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Authors: | Zhongsheng Deng Jiandong Wei Xiaoshong Xue Jue Wang Lingyan Chen |
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Affiliation: | (1) Pohl Institute of Solid State Physics, Tongji University, Shanghai, 200092, P.R. China |
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Abstract: | Silica aerogels were made by sol-gel techniques using industrial silicon derivatives (polyethoxydisiloxanes, E-40), followed by drying under sub-critical pressure with iso-butanol. The shrinkage (linear), specific surface area, SBET, SEM, TEM and the pore size distribution of the silica aerogels were investigated. The results show that the shrinkage (linear) is below 5%, diameter of the silica particles is about 6 nm and the pore size of the silica aerogels is 10 nm. The specific surface area of the silica aerogel is 559.2 m2/g. IR and NMR techniques were used to determine the organic groups on the silica matrix, GC/MS was also introduced to analyse the composition of the recycled iso-butanol. The surface modification and the reactions of iso-butanol to the silica aerogel are also discussed. |
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Keywords: | silica aerogel sol-gel polyethoxydisiloxanes sub-critical drying |
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