期刊
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
卷 13, 期 3, 页码 -出版社
TAYLOR & FRANCIS LTD
DOI: 10.1088/1468-6996/13/3/035003
关键词
tert-butyl alcohol; vacuum freeze drying; silica cryogels; thermal insulating
资金
- National Nature Science Foundation of China [51172234]
- Guangdong Provincial Science and Technology Grant [2011B010100043]
Nanoporous silica cryogels with a high specific surface area of 1095m(2) g(-1) were fabricated using tert-butyl alcohol as a reaction solvent, via a cost-effective sol-gel process followed by vacuum freeze drying. The total time of cryogel production was reduced markedly to one day. The molar ratio of solvent/precursor, which was varied from 5 to 13, significantly affected the porous structure and thermal insulating properties of the cryogels. The silica cryogels with low densities in the range of 0.08-0.18 g cm(-3) and thermal conductivities as low as 6.7mW(m.K)(-1) at 100 Pa and 28.3mW(m.K)(-1) at 10(5) Pa were obtained using this new technique.
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