Effect of wettability and surface roughness on ice-adhesion strength of hydrophilic, hydrophobic and superhydrophobic surfaces

Bharathidasan, T and Kumar, Vijay and Bobji, MS and Chakradhar, RPS and Basu, Bharathibai J (2013) Effect of wettability and surface roughness on ice-adhesion strength of hydrophilic, hydrophobic and superhydrophobic surfaces. Applied Surface Science, 314. pp. 241-250. ISSN 0042-207X

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Abstract

The anti-icing properties of hydrophilic, hydrophobic and superhydrophobic surfaces/coatings were evaluated using a custom-built apparatus based on zero-degree cone test method. The ice-adhesion reduction factor (ARF) of these coatings has been evaluated using bare aluminium alloy as a reference. The wettability of the surfaces was evaluated by measuring water contact angle (WCA) and sliding angle. It was found that the ice-adhesion strength on silicone based hydrophobic surfaces was ~ 43 times lower than compared to bare polished aluminium alloy indicating excellent anti-icing property of these coatings. Superhydrophobic coatings displayed poor anti-icing property in spite of their high water repellence. Field Emission Scanning Electron Microscope reveal that Silicone based hydrophobic coatings exhibited smooth surface whereas the superhydrophobic coatings had a rough surface consisting of microscale bumps and protrusions superimposed with nanospheres. Both surface roughness and surface energy play a major role on the ice-adhesion strength of the coatings. The 3D surface roughness profiles of the coatings also indicated the same trend of roughness. An attempt is made to correlate the observed ice-adhesion strength of different surfaces with their wettability and surface roughness. It was concluded that smooth surface with low surface energy are responsible for low ice-adhesion strength.

Item Type: Article
Uncontrolled Keywords: Anti-icing; ice-adhesion strength; hydrophobic; superhydrophobic; water contact angle; surface roughness
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mr. BS Shivaram
Date Deposited: 07 Nov 2014 05:29
Last Modified: 07 Nov 2014 05:29
URI: http://nal-ir.nal.res.in/id/eprint/12014

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