1998
DOI: 10.1016/s0022-3093(98)00003-9
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Drying of aerogels in different solvents between atmospheric and supercritical pressures

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Cited by 70 publications
(39 citation statements)
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“…Furthermore, HTSCD has been found the best way to minimize shrinkage of the gel. For each possible solvent, drying pressures are known for which shrinkage of the aerogels stays below 5 % [39].…”
Section: Supercritical Dryingmentioning
confidence: 99%
“…Furthermore, HTSCD has been found the best way to minimize shrinkage of the gel. For each possible solvent, drying pressures are known for which shrinkage of the aerogels stays below 5 % [39].…”
Section: Supercritical Dryingmentioning
confidence: 99%
“…Aging in a siloxane solution increases the stiffness and strength of the alcogel by adding new monomers to the silica network and by improving the degree of siloxane cross linking; conversely this step will reduce the permeability (Kirkbir et al, 1998). During aging, material is transported to the neck region between particles giving a more rigid gel network.…”
Section: Agingmentioning
confidence: 99%
“…Many efforts have been undertaken for establishing a drying procedure that can be carried out at moderate temperatures and pressures. Kirkbir et al (1998) observed that a threshold pressure exists above which the shrinkage is negligible. Below the threshold point, the capillary pressure overcomes the strength and the structure collapses.…”
Section: High Temperature Supercritical Drying (Htscd)mentioning
confidence: 99%
“…Shrinkage can also be eliminated by carefully choosing the solvent present in the monolith during the drying step. To this end, isobutanol, 2-pentanol and iso-octane led to large, crack-free monoliths [42]. Both drying temperature and pressure can be lowered below the critical value for these solvents while still obtaining crack-free monoliths if the pores are large enough [43].…”
Section: Synthesismentioning
confidence: 99%