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

2021, Volume 15, Issue 4

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Frontiers of Chemical Science and Engineering >> 2021, Volume 15, Issue 4 doi: 10.1007/s11705-020-2028-4

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

. School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.. Department of Physics, University of York, York YO10 5DD, UK

Received: 2021-01-20 Accepted: 2021-03-03 Available online: 2021-03-03

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Abstract

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 and 423 m ∙g , respectively. The average pore diameter of silica aerogels is 23 nm as the pore specific volume is 1.11 cm ∙g . 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.

Keywords

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

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