Ambient pressure dried tetrapropoxysilane-based silica aerogels with high specific surface area

Vinayak G. Parale, Wooje Han, Hae Noo Ree Jung, Kyu Yeon Lee, Hyung-Ho Park

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In the present paper, we report the synthesis of tetrapropoxysilane (TPOS)-based silica aerogels with high surface area and large pore volume. The silica aerogels were prepared by a two-step sol-gel process followed by surface modification via a simple ambient pressure drying approach. In order to minimize drying shrinkage and obtain hydrophobic aerogels, the surface of the alcogels was modified using trichloromethylsilane as a silylating agent. The effect of the sol-gel compositional parameters on the polymerization of aerogels prepared by TPOS, one of the precursors belonging to the Si(OR)4 family, was reported for the first time. The oxalic acid and NH4OH concentrations were adjusted to achieve good-quality aerogels with high surface area, low density, and high transparency. Controlling the hydrolysis and condensation reactions of the TPOS precursor turned out to be the most important factor to determine the pore characteristics of the aerogel. Highly transparent aerogels with high specific surface area (938 m2/g) and low density (0.047 g/cm3) could be obtained using an optimized TPOS/MeOH molar ratio with appropriate concentrations of oxalic acid and NH4OH.

Original languageEnglish
Pages (from-to)63-70
Number of pages8
JournalSolid State Sciences
Volume75
DOIs
Publication statusPublished - 2018 Jan 1

Fingerprint

Aerogels
aerogels
Specific surface area
Silicon Dioxide
Silica
silicon dioxide
Oxalic Acid
oxalic acid
Oxalic acid
drying
Drying
porosity
Condensation reactions
sol-gel processes
shrinkage
Transparency
Sol-gel process
Sol-gels
Surface treatment
hydrolysis

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Parale, Vinayak G. ; Han, Wooje ; Jung, Hae Noo Ree ; Lee, Kyu Yeon ; Park, Hyung-Ho. / Ambient pressure dried tetrapropoxysilane-based silica aerogels with high specific surface area. In: Solid State Sciences. 2018 ; Vol. 75. pp. 63-70.
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Ambient pressure dried tetrapropoxysilane-based silica aerogels with high specific surface area. / Parale, Vinayak G.; Han, Wooje; Jung, Hae Noo Ree; Lee, Kyu Yeon; Park, Hyung-Ho.

In: Solid State Sciences, Vol. 75, 01.01.2018, p. 63-70.

Research output: Contribution to journalArticle

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