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Chin. Phys. B, 2010, Vol. 19(10): 106801    DOI: 10.1088/1674-1056/19/10/106801

A new model for the formation of contact angle and contact angle hysteresis

Gong Mao-Gang(公茂刚), Liu Yuan-Yue(刘远越), and Xu Xiao-Liang(许小亮)
Department of Physics, University of Science and Technology of China, Hefei 230026, China
Abstract  The formation mechanism of the contact angle and the sliding angle for a liquid drop on a solid surface plays an important role in producing hydrophobic surfaces. A new half soakage model is established in this paper as a substitute for Wenzel (complete soakage) and Cassie (no soakage) models. The model is suited to many solid surfaces, whether they are hydrophilic or hydrophobic, or even superhydrophobic. Based on the half soakage model, we analyse two surfaces resembling lotus, i.e. taper-like surface and corona-like surface. Furthermore, this new model is used to establish a quantitative relationship between the sliding angle and the parameters of surface morphology.
Keywords:  contact angle      half soakage model      contact angle hysteresis  
Received:  20 March 2010      Revised:  26 April 2010      Accepted manuscript online: 
PACS:  68.03.Cd (Surface tension and related phenomena)  
  68.08.-p (Liquid-solid interfaces)  
  68.35.B- (Structure of clean surfaces (and surface reconstruction))  
Fund: Project supported by the National Basic Research Program of China (Grant No. 2006CB302900) and the National Natural Science Foundation of China (Grant No. 50872129).

Cite this article: 

Gong Mao-Gang(公茂刚), Liu Yuan-Yue(刘远越), and Xu Xiao-Liang(许小亮) A new model for the formation of contact angle and contact angle hysteresis 2010 Chin. Phys. B 19 106801

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