Fume SILICA (cas 10279-57-9) improves the insulating and mechanical performance of SILICA (cas 10279-57-9) aerogel/glass fiber composite
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Add time:07/27/2019 Source:sciencedirect.com
In this work, we prepared the mechanically strong and highly insulated composite of the SILICA (cas 10279-57-9) aerogel/glass fiber by adding fumed silica. The composite was made by acid-base catalyzed tetraethyl orthosilicate sol-gel, to which the fumed silica was added, followed by supercritical CO2 drying technique. The resultant composite possesses not only ultra-low thermal conductivity of 0.0194 W·(m·K)−1 but also excellent flexural strength of 0.58 MPa stress and low bulk density of 0.239 g/cm3. These outstanding performances of the composite are related with its special dense mesoporous SiOSi network formed around the glass fiber by the silica aerogel, and fume silica merged matrix, in which the macrospores of the fumed silica turned to mesoporous and became a part of the silica aerogel which further helped in improving the pore structure. This technique paves a way to enable the silica aerogel/glass fiber pragmatic applications as insulation materials.
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