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Relationship between sliding acceleration of water droplets and dynamic contact angles on hydrophobic surfaces |
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| Authors: | Munetoshi Sakai Jeong-Hwan Song Shunsuke Suzuki Yoshikazu Kameshima Akira Nakajima |
| Affiliation: | a Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa 213-0012, Japan b Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan c Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan |
| Abstract: | This study measured sliding acceleration of water droplets on hydrophobic solid surfaces and used expanding and contracting method to compare that value with dynamic contact angles. Sliding action of the droplet was classified into three motion categories: constant accelerated motion, constant velocity and stasis. Differences exist in the dependencies of contact radius and the injection-suction rate in dynamic contact angle hysteresis according to these categories. This method is an effective indicator of water droplets’ sliding acceleration. |
| Keywords: | Hydrophobicity Sliding angle Contact angle Sliding acceleration Contact angle hysteresis |
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