Table of Contents
ISRN Nanotechnology
Volume 2011 (2011), Article ID 803910, 6 pages
http://dx.doi.org/10.5402/2011/803910
Research Article

Fabrication of Superhydrophobic Nanocomposite Coatings Using Polytetrafluoroethylene and Silica Nanoparticles

Surface Engineering Division, CSIR National Aerospace Laboratories, Bangalore 560017, India

Received 18 April 2011; Accepted 12 May 2011

Academic Editors: J.-I. Shirakashi and D. Wang

Copyright © 2011 Bharathibai J. Basu and V. Dinesh Kumar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Superhydrophobic nanocomposite coatings were fabricated by incorporating hydrophobically modified silica (HMS) nanoparticles in polytetrafluoroethylene (PTFE) emulsion. Hydrophobicity of the coating was dependent on the concentration of HMS. Coatings containing optimum amounts of PTFE and HMS exhibited superhydrophobic property with high water contact angle (WCA) of 165 and low sliding angle <2. Scanning electron microscopic (SEM) studies have shown a binary surface topography composed of microbumps and nanoscale granules. The synergistic effect of the micro-nano-binary structure and low surface energy of PTFE was responsible for the superhydrophobicity of the coating. The method is simple and cost-effective and can be used for preparing self-cleaning superhydrophobic coatings on large areas of different kinds of substrates like glass, metal, and composites.