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 journalArticlepeer-review

36 Citations (Scopus)


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
Publication statusPublished - 2018 Jan

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Masson SAS

All Science Journal Classification (ASJC) codes

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


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