期刊
APPLIED SURFACE SCIENCE
卷 258, 期 7, 页码 2707-2716出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.10.121
关键词
Superhydrophobic; Contact angle hysteresis; Changes of surface free energy; Free energy barrier; Symmetry
类别
资金
- National Natural Science Foundation of China [20973146]
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE10206]
- State Key Laboratory for Manufacturing Systems Engineering [2010003]
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. (C) 2011 Elsevier B.V. All rights reserved.
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