WETTING OF ROUGH SURFACES

Xinping Zhang (), Sirong Yu, Zhenming He and Yaoxin Miao
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Xinping Zhang: Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Sirong Yu: College of Materials Science and Engineering, Jilin University, Changchun 130025, China
Zhenming He: College of Materials Science and Engineering, Jilin University, Changchun 130025, China
Yaoxin Miao: The Key Laboratory of Automobile Materials, Ministry of Education, China

Surface Review and Letters (SRL), 2004, vol. 11, issue 01, 7-13

Abstract: This paper focuses on effects of roughness on wettability. According to Wenzel's equation, the transition of theoretical wetting contact angles is 90°, whereas many experimental results have indicated that such a transition takes place at contact angles smaller than 90°. A new model of wetting on roughness surface is established in this paper. The model indicates that the influencing factors of wetting on roughness surface include not only equilibrium contact angleθ0and surface roughness, but also the system of liquids and solid substrates. There is a corresponding transition angle for every surface roughness, and the transition angle is lower than 90°. Surface roughness is propitious to improve the contact angle only whenθ0is lower than the transition angle. The effect of surface roughness on the contact angle increases with the increase ofrE. To engineer the surface with different roughnesses, a Ti test sample is polished with sandpaper with abrasive number 350, 500, 1000 and 2000; the contact angles of water on Ti are measured by the sessile drop method. The results of the theoretical analysis agree with experimental ones.

Keywords: Contact angle; surface roughness; interface tension; mathematics model (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X04005925

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