Superhydrophobic silica films by sol-gel co-precursor method

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

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142 Citations (Scopus)

Abstract

Wetting phenomena of water droplets on solid are of crucial concern in our daily life as well as in engineering and science. The present paper describes the room temperature synthesis of superhydrophobic silica films on glass substrates using trimethylethoxysilane (TMES) as a co-precursor. The coating sol was prepared by keeping the molar ratio of tetraethoxysilane (TEOS) precursor, methanol (MeOH) solvent, water (H 2 O) constant at 1:38.6:8.68, respectively, with 2 M NH 4 OH throughout the experiments and the TMES/TEOS molar ratio (M) was varied from 0 to 1.1. It was found that with an increase in M value, the hydrophobicity of the films increased, however the optical transmission decreased from 88% to 82% in the visible range. The hydrophobic silica films retained their hydrophobicity up to a temperature of 275 °C and above this temperature the films became superhydrophilic. The hydrophobic 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 contact angle measurements.

Original languageEnglish
Pages (from-to)217-222
Number of pages6
JournalApplied Surface Science
Volume256
Issue number1
DOIs
Publication statusPublished - 2009 Oct 15

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Keywords

  • Contact angle
  • Optical transmission
  • Sliding angle
  • Superhydrophobic
  • Thermal stability
  • Wetting

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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