Effect of microstructure and surface roughness on the wettability of superhydrophobic sol–gel nanocomposite coatings

Basu, Bharathibai J and Hariprakash, V and Aruna, ST and Lakshmi, RV and Manasa, J and Shruthi, BS (2010) Effect of microstructure and surface roughness on the wettability of superhydrophobic sol–gel nanocomposite coatings. Journal of Sol-Gel Sciene and Technology, 56. pp. 278-286. ISSN 0928-0707

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Abstract

Sol–gel nanocomposite coatings were fabricated by spraying precursor mixtures containing hydrophobically modified silica (HMS) nanoparticles dispersed in sol–gel matrices prepared with acid-catalyzed tetraethoxysilane (TEOS), and methyltriethoxysilane (MTEOS). The hydrophobicity of the coatings increased with increase in the concentration of HMS nanoparticles. Superhydrophobic coatings with water contact angle (WCA) of 166� and rolloff angle \2� were obtained by optimizing the sol–gel processing parameters and the concentration of silica nanoparticles in the coating. FESEM studies have shown that surface has a micro-nano binary structure composed of microscale bumps and craters with protrusions of nanospheres. The properties of composite coatings fabricated by spin coating and spray coating methods were compared. It was found that the microstructure and the wettability were also dependent on the method of application of the coating.

Item Type: Article
Uncontrolled Keywords: Superhydrophobic, Sol–gel, Nanocomposite coating, Water contact angle, Surface morphology
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Users 10 not found.
Date Deposited: 31 Jan 2012 05:34
Last Modified: 06 Aug 2015 09:11
URI: http://nal-ir.nal.res.in/id/eprint/10299

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