Ultrahydrophobic silica films by sol-gel process

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

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


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 (27 °C) synthesis of adherent and water repellent silica films on glass substrates using vinyltrimethoxysilane (VTMS) as a hydrophobic reagent by a single step sol-gel process. The silica sol was prepared by keeping the molar ratio of tetraethoxysilane (TEOS), methanol (MeOH), water (H2O) constant at 1:14.69:5, respectively, with 0.01 M NH4F throughout the experiments and the VTMS/TEOS molar ratio (M) was varied from 0 to 0.97. The effects of M on the surface structure and hydrophobicity have been researched. The static water contact angle as high as 144° and water sliding angle as low as 14° was obtained for silica film prepared from M = 0.97. The hydrophobic silica films retained their hydrophobicity up to a temperature of 255 °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, humidity test and static and dynamic water contact angle measurements.

Original languageEnglish
Pages (from-to)565-571
Number of pages7
JournalJournal of Porous Materials
Issue number5
Publication statusPublished - 2010 Oct


  • Adherent
  • Contact angle
  • Humidity
  • Hydrophobic
  • Sliding angle
  • Thermal stability

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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