Effect of substrate roughness on the apparent surface free energy of sputter deposited superhydrophobic PTFE thin films

Barshilia, Harish C and Krishna, Mohan and Selvakumar, N and Rajam, KS (2009) Effect of substrate roughness on the apparent surface free energy of sputter deposited superhydrophobic PTFE thin films. Applied Physics Letters, 95 (033116). ISSN 0003-6951

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Abstract

Surface morphology plays an important role in determining the superhydrophobic behavior of solids. To provide insights on influence of roughness over a wide range, we have carried out a quantitative study of effect of substrate roughness on contact angle and surface free energy (SFE) of sputter deposited superhydrophobic PTFE thin films. An optimum value for substrate roughness has been derived and a practical methodology (sand blasting) for its fabrication has been proposed. The SFE values were calculated using Zisman method and validated by Fowkes-Girifalco-Good theory.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mr N Selvakumar
Date Deposited: 27 Jul 2011 05:33
Last Modified: 27 Jul 2011 05:33
URI: http://nal-ir.nal.res.in/id/eprint/9661

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