Nanoporous silica cryogels with a high specific surface area of 1095 m g 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 and thermal conductivities as low as 6.7 mW (m·K) at 100 Pa and 28.3 mW (m·K) at 10 Pa were obtained using this new technique.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5090280 | PMC |
| http://dx.doi.org/10.1088/1468-6996/13/3/035003 | DOI Listing |
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