Preparation and Characterization of Hydrophobic Mesoporous SiO₂ Aerogel

Abstract:

Hydrophobic mesoporous silica aerogels were synthesized using cheap industrial grade tetraethyl orthosilicate (TEOS) as precursor by ambient pressure drying.The silica alcogels were prepared by acid-base sol-gel polymerization of the TEOS, the surfaces of silica alcogels were modified using trimethylchlorosilane/ hexamethyldisiloxane via simultaneous solvent exchange and surface modification. The attachment of trymethylsilyl (-Si(CH₃)₃) groups to the silica surface was confirmed by the presence of Si-CH₃ peaks at 2963, 1256 and 845 cm−1 in the IR spectra. Properties of the aerogels were examined by SEM, TEM, XRD, BET and DTA-TG analyses. The results indicate that the aerogels in a typical amorphous state have a highly porous network with an average pore diameter in the range of 5–10 nm, have high specific surface area (931 m²/g) and are thermally stable up to 322 °C.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 1393-1397
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.1393
• Online since: August 2011
• Authors: Hong Xia Liu, Song Chen, Rong Shao, Rui Dong, Ming Lin Jia
• Keywords: Ambient Pressure Drying, Hydrophobic, Silica Aerogel, Surface Modification

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DOI: 10.1002/9783527619474.ch11