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2010•Unpublished venueRequires access

Preparation and Characterization of Hydrophobic Mesoporous SiO 2 Aeroge at Low Cost

Hongxia Liu, Fan Tang, Rong Shao, Rui Dong, Ming-lin Jia, Song Chen

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Abstract

silica gel was prepared by acid-base two step catalysis using cheap industrial tetraethyl orthosilicate (TEOS) as precursor, the obtained silica gel was directly modified by using trimethylchlorosilane hexa methyl disiloxane (TMCS/HMDSO) mixed solution , the obtained modified gel was then dried at ambient atmosphere to prepare hydrophobic SiO2 aerogel with a high specific surface area. The chemical compisites, hydrophobic property of the modified silica aerogel had been studied by the IR, N2 phycial absorbtion and the determination of contact angle. The results showed that the modified samples had a good hydrophobic property because of the hydrophilic group (-CH3) that was linked to the aerogel's surface. The specific surface area of the sample with high thermal stability was up to 931 m 2 /g.

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What this paper is about

silica gel was prepared by acid-base two step catalysis using cheap industrial tetraethyl orthosilicate (TEOS) as precursor, the obtained silica gel was directly modified by using trimethylchlorosilane hexa methyl disiloxane (TMCS/HMDSO) mixed solution , the obtained modified gel was then dried at ambient atmosphere to prepare hydrophobic SiO2 aerogel with a high specific surface area. The chemical compisites, hydrophobic property of the modified silica aerogel had been studied by the IR, N2 phycial absorbtion and the determination of contact angle. The results showed that the modified samples had a good hydrophobic property because of the hydrophilic group (-CH3) that was linked to the aerogel's surface. The specific surface area of the sample with high thermal stability was up to 931 m 2 /g.

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Available abstract

silica gel was prepared by acid-base two step catalysis using cheap industrial tetraethyl orthosilicate (TEOS) as precursor, the obtained silica gel was directly modified by using trimethylchlorosilane hexa methyl disiloxane (TMCS/HMDSO) mixed solution , the obtained modified gel was then dried at ambient atmosphere to prepare hydrophobic SiO2 aerogel with a high specific surface area. The chemical compisites, hydrophobic property of the modified silica aerogel had been studied by the IR, N2 phycial absorbtion and the determination of contact angle. The results showed that the modified samples had a good hydrophobic property because of the hydrophilic group (-CH3) that was linked to the aerogel's surface. The specific surface area of the sample with high thermal stability was up to 931 m 2 /g.

Key concepts: Aerogel, Tetraethyl orthosilicate, Hydrophobic silica, Disiloxane, Thermal stability, Contact angle, Mesoporous material, Materials science

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Preparation and Characterization of Hydrophobic Mesoporous SiO 2 Aeroge at Low Cost — Research Paper | ScholarLens