Improvement in optical and physical properties of TEOS based aerogels using acetonitrile via ambient pressure drying

Uzma K.H. Bangi, Chang Sun Park, Seungsu Baek, Hyung-Ho Park

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Abstract

The experimental results on the improvement in optical and physical properties of TEOS based aerogels using acetonitrile via ambient pressure drying are reported herein. Silica gels were prepared by a two step sol-gel process using hydrochloric acid (HCl) as an acid catalyst and tertrabutyl ammonium fluoride (TBAF) as a base catalyst. Acetonitrile acts as a strong diluting solvent in the preparation of silica sol which considerably lowers the density and improves the optical transmission of silica aerogels. To study the effect of acetonitrile on the properties of TEOS based aerogels, acetonitrile::TEOS molar ratio was varied from 1.09 to 5.45. Optical transmission study of these aerogels was carried out by comparing the photos of aerogel granules. Optically transparent silica aerogels with low density (0.065 g/cc) as well as low thermal conductivity (0.068 W/mK) were successfully prepared using 1×10 -3 M HCl, 0.1M TBAF and TEOS::MeOH::H 2 O(A)::H 2 O(B)::Acetonitrile::TMCS molar ratio at 1::16.75::3.5:2.5::1.69::0. 88 respectively by ambient pressure drying method.

Original languageEnglish
Pages (from-to)6883-6888
Number of pages6
JournalCeramics International
Volume38
Issue number8
DOIs
Publication statusPublished - 2012 Dec 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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