Optically transparent superhydrophobic TEOS-derived silica films by surface silylation method

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

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Optically transparent silica films were prepared at room temperature (̃27°C) by keeping the molar ratio of TEOS:MeOH:H2O (0.001 M NH4F) constant at 1:19.29: 6.20, respectively. A surface chemical modification of the films was done with alkylchlorosilanes at different concentrations from 0 to 1 vol. % and aging times varied from half to 2 h. The DMCS and TMCS surface modified silica films showed the static water contact angle of 146° and 162°, respectively. When the DMCS and TMCS modified films were cured at temperatures higher than 240 and 275°C, respectively, the films became superhydrophilic. Further, the humidity study was carried out at a relative humidity of 90% at 30°C temperature over 60 days. We characterized the water repellent silica films by Fourier transform infrared spectroscopy, scanning electron microscopy, atomic force microscopy, % of optical transmission, humidity tests and contact angle measurements.

Original languageEnglish
Pages (from-to)208-215
Number of pages8
JournalJournal of Sol-Gel Science and Technology
Volume53
Issue number2
DOIs
Publication statusPublished - 2010 Feb 1

Keywords

  • Humidity
  • Hydrophobicity
  • Sliding angle
  • Sol-gel process
  • Wetting phenomena

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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