A new model for thermodynamic analysis on wetting behavior of superhydrophobic surfaces |
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| Authors: | Hongyun ZhangWen Li Guoping Fang |
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| Institution: | a Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education and Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan 411105, China
b Department of mechanical Engineering, University of Alberta, Edmonton, AB, T6G 2G8 Canada |
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| Abstract: | Superhydrophobic surfaces have shown inspiring applications in microfluidics, and self-cleaning coatings owing to water-repellent and low-friction properties. However, thermodynamic mechanism responsible for contact angle hysteresis (CAH) and free energy barrier (FEB) have not been understood completely yet. In this work, we propose an intuitional 3-dimension (3D) droplet model along with a reasonable thermodynamic approach to gain a thorough insight into the physical nature of CAH. Based on this model, the relationships between radius of three-phase contact line, change in surface free energy (CFE), average or local FEB and contact angle (CA) are established. Moreover, a thorough theoretical consideration is given to explain the experimental phenomena related to the superhydrophobic behavior. The present study can therefore provide some guidances for the practical fabrications of the superhydrophobic surfaces. |
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| Keywords: | Superhydrophobic Contact angle hysteresis Changes of surface free energy Free energy barrier Symmetry |
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