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http://dx.doi.org/10.12925/jkocs.2010.27.3.8

Surface modification of silica aerogel by surfactant adsorption and heat treatment methods  

Kim, Nam-Yi (Department of Chemical Engineering, Kyonggi University)
Kim, Seong-Woo (Department of Chemical Engineering, Kyonggi University)
Publication Information
Journal of the Korean Applied Science and Technology / v.27, no.3, 2010 , pp. 282-289 More about this Journal
Abstract
In preparation of silica aerogel-based hybrid coating materials, the combination of hydrophobic aerogel with organic polar binder material is shown to be very limited due to dissimilar surface property between two materials. Accordingly, the surface modification of the aerogel would be required to obtain compatibilized hybrid coating sols with homogeneous dispersion. In this study, the surface of silica aerogel particles was modified by using both surfactant adsorption and heat treatment methods. Four types of surfactants with different molecular weights and HLB values were used to examine the effect of chain length and hydrophilicity. The surface property of the modified aerogel was evaluated in terms of visible observation for aerogel dispersion in water, water contact angle measurement, and FT-IR analysis. In surface modification using surfactants, the effects of surfactant type and content, and mixing time as process parameter on the degree of hydrophilicity for the modified aerogel. In addition, the temperature condition in modification process via heat treatment was revealed to be significant factor to prepare aerogel with highly hydrophilic property.
Keywords
silica aerogel; surface modification; surfactant; heat treatment;
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Times Cited By KSCI : 1  (Citation Analysis)
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