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

• Published in: Frontiers of chemical science and engineering Vol. 15; no. 4; pp. 954 - 959
• Main Authors: Liu, Yujing, Han, Xiao, Kuerbanjiang, Balati, Lazarov, Vlado K., Šiller, Lidija
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.08.2021; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Contact angle; Density; Industrial Chemistry/Chemical Engineering; Nanotechnology; Pressure; Research Article; Silica aerogels; Silicon dioxide; Sodium bicarbonate; Specific volume; Water drops; methyltrimethoxysilane; trimethylchlorosilane; ambient pressure drying; sodium bicarbonate; silica aerogel; solvent exchange
• ISSN: 2095-0179; 2095-0187
• DOI: 10.1007/s11705-020-2028-4

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·cm −3 and 423 m 2 ·g −1 , respectively. The average pore diameter of silica aerogels is 23 nm as the pore specific volume is 1.11 cm 3 ·g −1 . Further, the contact angle between water droplet and the surface of silica aerogels in specific condition can be as high as 166°, which indicates a super-hydrophobic surface of aerogels.