Effect of substrate roughness on the contact angle of sputter deposited superhydrophobic polytetrafluoroethylene coatings

Selvakumar, N and Barshilia, Harish C and Ramesh, M and Rajam, KS (2010) Effect of substrate roughness on the contact angle of sputter deposited superhydrophobic polytetrafluoroethylene coatings. In: 23rd International Conference on Surface Modification Technologies (SMT 23), 2-5 Nov 2009, Mamallapuram.

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Abstract

A polytetrafluoroethylene (PTFE) superhydrophobic coating was prepared using magnetron sputtering process. The PTFE coating was deposited on sand blasted glass substrates with different substrate roughness (Ra) in the range of 50 - 7000 nm. The PTFE coatings were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, contact angle analyzer and atomic force microscopy techniques. The PTFE coatings deposited on sand blasted glass substrates (Ra = 4500-4800 nm) were found to be superhydrophobic with a static contact angle of 152 and a low contact angle hysteresis (2). In order to investigate the influence of substrate roughness on the wetting properties, we have carried out a quantitative study of effect of substrate roughness on contact angle and surface free energy (SFE) of sputter deposited PTFE coatings.

Item Type: Conference or Workshop Item (Paper)
Subjects: CHEMISTRY AND MATERIALS > Inorganic, Organic and Physical Chemistry
Depositing User: Mr N Selvakumar
Date Deposited: 27 Jul 2011 06:35
Last Modified: 19 Sep 2011 06:20
URI: http://nal-ir.nal.res.in/id/eprint/9689

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