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- W2471078717 abstract "Quartz fiber composites filled with nanosized SiO 2 were prepared by sol-gel method with vacuum impregnation , supercritical drying and surface modification. The silica sol for vacuum impregnated were made from tetraethyl orthosilicate (TEOS), anhydrous ethanol, water and acid catalyst as the starting materials. The water adsorption rate, apparent porosity and electrical properties of composites were investigated by means of archimedes method and waveguide method while the surface area and pore size of the aerogel samples were tested by BET, the mechanism of hydrophobicity was also discussed. The results showed that the moisture absorption rate of products was decreased to 1.21% from 17.36% that without filled with nanosized SiO 2 , with a decreasing range of 93%. Additional coating could make the rate even as low as 0.052%.The dielectric constant had no significant change while the loss tangent decreased from 3.1╳10 -3 to 1.4╳10 -3 ,with a decreasing range of 51.2%." @default.
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- W2471078717 date "2016-07-01" @default.
- W2471078717 modified "2023-09-25" @default.
- W2471078717 title "Characterization of SiO<sub>2</sub> Aerogel/SiO<sub>2</sub> Fiber Composites Prepared by Sol-Gel Method" @default.
- W2471078717 doi "https://doi.org/10.4028/www.scientific.net/kem.697.409" @default.
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