Ambient-dried thermal superinsulating monolithic silica-based aerogels with short cellulosic fibers
- Markevicius, Gediminas
- Ladj, Rachid
- Niemeyer, Philipp
- Budtova, Tatiana
- Rigacci, Arnaud
DOIAbstract
International audienceShort (<2.5 mm) cellulose fiber–silica composite aerogels were synthesized by dispersing cellulose fibers in polyethoxydisiloxane-based sol. After in situ gelation, silica phase was hydrophobized with hexamethyldisilazane, and the composites were dried either at ambient pressure or with supercritical (sc) CO2. Fiber concentration was varied from 0 to 25 wt% (corresponding to 0–2.1 vol%) of the final dried composite. Preformed cellulosic fiber network preserved the monolithic shape of the silica-based composites during ambient drying. At room conditions, thermal conductivities were 0.015 ± 0.001 W/(m K) for sc-dried aerogels and 0.017 ± 0.001 W/(m K) for their ambient-dried counterparts. Materials dried with either meth...
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