Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Surface modification of silica aerogel by surfactant adsorption and heat treatment methods

계면활성제 흡착 및 열처리를 이용한 실리카 에어로겔의 표면 개질

  • Kim, Nam-Yi (Department of Chemical Engineering, Kyonggi University) ;
  • Kim, Seong-Woo (Department of Chemical Engineering, Kyonggi University)
  • Received : 2010.06.10
  • Accepted : 2010.09.24
  • Published : 2010.09.30
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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.

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References

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