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    Effect of sodium bicarbonate solution on methyltrimethoxysilane-derived silica aerogels dried at ambient pressure

    Year: 2021

    Journal: Front. Chem. Sci. Eng., Volume 15, AUG, page 954–959

    Authors: Liu, Yujing; Han, Xiao; Kuerbanjiang, Balati; Lazarov, Vlado K.; Siller, Lidija

    Keywords: silica aerogel; methyltrimethoxysilane; solvent exchange; sodium bicarbonate; trimethylchlorosilane; ambient pressure drying

    Here we present an economical ambient pressure drying method of preparing monolithic silica aerogels from methyltrimethoxysilane precursor while using sodium bicarbonate solution as the exchanging solvent. We prepared silica aerogels with a density and a specific surface area of 0.053 g center dot cm(-3) and 423 m(2)center dot g(-1), respectively. The average pore diameter of silica aerogels is 23 nm as the pore specific volume is 1.11 cm(3)center dot g(-1). Further, the contact angle between water droplet and the surface of silica aerogels in specific condition can be as high as 166 degrees, which indicates a super-hydrophobic surface of aerogels.
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