Porous superhydrophobic silica films by sol-gel process

Sanjay S. Latthe, Hiroaki Imai, V. Ganesan, A. Venkateswara Rao

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

Wettability of solid surfaces is a crucial concern in our daily life as well as in engineering and science. The present research work describes the room temperature synthesis of adherent and porous superhydrophobic silica films on glass substrates using methyltriethoxysilane (MTES) as hydrophobic reagent by sol-gel process. The coating sol was prepared by keeping the molar ratio of tetraethoxysilane (TEOS), methanol (MeOH), water (H2O) constant at 1:22.09:6.25, respectively, with 0.01 M NH4F catalyst throughout the experiments and the MTES/TEOS molar ratio (M) was varied from 0 to 0.43. The static water contact angle as high as 160° and water sliding angle as low as 3° was obtained for silica film prepared from M = 0.43. The surface morphological study showed the porous structure with pore sizes ranging from 250 to 300 nm. The superhydrophobic silica films retained their superhydrophobicity up to a temperature of 290 °C and above this temperature the films became superhydrophilic. The prepared silica films were characterized by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Fourier Transform Infrared (FT-IR) spectroscopy, percentage of optical transmission, humidity test and static and dynamic water contact angle measurements.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume130
Issue number1-3
DOIs
Publication statusPublished - 2010 May

Fingerprint

sol-gel processes
Silicon Dioxide
Sol-gel process
Silica
silicon dioxide
Water
water
Contact angle
Polymethyl Methacrylate
Polymers
Angle measurement
Light transmission
Sols
wettability
solid surfaces
Temperature
Pore size
Fourier transform infrared spectroscopy
reagents
Methanol

Keywords

  • Contact angle
  • Sliding angle
  • Superhydrophobic
  • Wettability

ASJC Scopus subject areas

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

Cite this

Porous superhydrophobic silica films by sol-gel process. / Latthe, Sanjay S.; Imai, Hiroaki; Ganesan, V.; Venkateswara Rao, A.

In: Microporous and Mesoporous Materials, Vol. 130, No. 1-3, 05.2010, p. 115-121.

Research output: Contribution to journalArticle

Latthe, Sanjay S. ; Imai, Hiroaki ; Ganesan, V. ; Venkateswara Rao, A. / Porous superhydrophobic silica films by sol-gel process. In: Microporous and Mesoporous Materials. 2010 ; Vol. 130, No. 1-3. pp. 115-121.
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