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

Research output: Contribution to journalArticle

11 Citations (Scopus)

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

Fingerprint

Aerogels
Acetonitrile
Drying
Optical properties
Physical properties
Silicon Dioxide
Hydrochloric Acid
Silica
Hydrochloric acid
Light transmission
Catalysts
Silica Gel
Silica gel
Polymethyl Methacrylate
Sols
Sol-gel process
acetonitrile
Thermal conductivity
Acids

All Science Journal Classification (ASJC) codes

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

Cite this

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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.",
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Improvement in optical and physical properties of TEOS based aerogels using acetonitrile via ambient pressure drying. / Bangi, Uzma K.H.; Park, Chang Sun; Baek, Seungsu; Park, Hyung-Ho.

In: Ceramics International, Vol. 38, No. 8, 01.12.2012, p. 6883-6888.

Research output: Contribution to journalArticle

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