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http://dx.doi.org/10.7736/KSPE.2014.31.2.171

Apparent Contact Angle on the Hydrophilic/Hydrophobic Surfaces with Micro-pillars  

Yu, Dong In (Department of Mechanical Engineering, POSTECH)
Doh, Seung Woo (Division of Advanced Nuclear Engineering, POSTECH)
Kwak, Ho Jae (Department of Mechanical Engineering, POSTECH)
Ahn, Ho Seon (Division of Mechanical System Engineering, Incheon National University)
Kim, Moo Hwan (Division of Advanced Nuclear Engineering, POSTECH)
Park, Hyun Sun (Division of Advanced Nuclear Engineering, POSTECH)
Publication Information
Journal of the Korean Society for Precision Engineering / v.31, no.2, 2014 , pp. 171-178 More about this Journal
Abstract
In this study, the apparent contact angle on the hydrophilic/hydrophobic surfaces with micropillars was studied. The previous researches showed that the Wenzel equation and the Cassie-Baxter equation were thermodynamically derived for the rough hydrophilic/hydrophobic surfaces and generally referenced on the field of wetting phenomena. For the verification of both equations, the apparent contact angle on the hydrophilic/hydrophobic surfaces with micro-pillars was measured. In the comparison between the measured and estimated apparent contact angles with the equations, the differences between the apparent contact angles were analyzed. Conclusively, the available range and limitation of theoretical equations were investigated and further researches about the apparent contact angle on the rough surfaces were proposed.
Keywords
Apparent contact angle; Micro structure; Wenzel equation; Cassie-Baxter equation;
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