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Characterization of Hydrophobic SiO2 Powders Prepared by Surface Modification on Wet Gel

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Abstract

Hydrophobic porous silica has been prepared by surface modification of TEOS (tetraethylorthosilicate) wet gel with 6 and 12 vol.% of TMCS (trimethylchlorosilane). We characterized the products by using FT-IR, TGA, DTA, N2 adsorption/desorption, contact angle and SEM. Surface silanol groups of the gel were widely replaced by–Si(CH3)3 to result in a hydrophobic SiO2 powder as confirmed by contact angle measurements with H2O, 1-butanol and ethanol. The modified dried gels had a surface area of 950–1000 m2/g (average pore size 120 Å), compared to the non-modified surface which had a surface area of 690 m2/g (average pore size 36 Å). The adsorption/desorption isotherm curves indicated they had similar pore characteristics as aerogels prepared by the supercritical drying process.

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Authors and Affiliations

  1. Department of Fine Chemicals Engineering and Chemistry, Chungnam National University, Taejon, 305-764, South Korea

    Ae-Young Jeong

  2. Department of Industrial Chemistry, Hanyang University, Seoul, 133-791, South Korea

    Sang-Man Koo

  3. Department of Fine Chemicals Engineering and Chemistry, Chungnam National University, Taejon, 305-764, South Korea

    Dong-Pyo Kim

Authors
  1. Ae-Young Jeong
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  2. Sang-Man Koo
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  3. Dong-Pyo Kim
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Jeong, AY., Koo, SM. & Kim, DP. Characterization of Hydrophobic SiO2 Powders Prepared by Surface Modification on Wet Gel. Journal of Sol-Gel Science and Technology 19, 483–487 (2000). https://doi.org/10.1023/A:1008716017567

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  • DOI: https://doi.org/10.1023/A:1008716017567

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