Ultrahydrophobic silica films by sol-gel process

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

Research output: Contribution to journalArticle

29 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 (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
Volume17
Issue number5
DOIs
Publication statusPublished - 2010 Oct

Fingerprint

Silicon Dioxide
Sol-gel process
Silica
Water
Hydrophobicity
Contact angle
Polymethyl Methacrylate
Polymers
Angle measurement
Sols
Surface structure
Temperature
Fourier transform infrared spectroscopy
Methanol
Wetting
Atomic force microscopy
Atmospheric humidity
Glass
Scanning electron microscopy
Substrates

Keywords

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

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

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

In: Journal of Porous Materials, Vol. 17, No. 5, 10.2010, p. 565-571.

Research output: Contribution to journalArticle

Latthe, Sanjay S. ; Imai, Hiroaki ; Ganesan, V. ; Rao, A. Venkateswara. / Ultrahydrophobic silica films by sol-gel process. In: Journal of Porous Materials. 2010 ; Vol. 17, No. 5. pp. 565-571.
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