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Chin. Phys. B, 2015, Vol. 24(8): 086801    DOI: 10.1088/1674-1056/24/8/086801

Contact angle hysteresis in electrowetting on dielectric

Zhao Rui (赵瑞), Liu Qi-Chao (刘启超), Wang Ping (王评), Liang Zhong-Cheng (梁忠诚)
Center of Optofluidic Technology, College of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Abstract  Contact angle hysteresis (CAH) is one of the significant physical phenomena in electrowetting on dielectric (EWOD). In this work, a theoretical model is proposed to characterize electrowetting evolution on substrates with CAH, and the relationship among apparent contact angle, potential, and some other parameters is quantified. And this theory is also validated experimentally. The results indicate that our theory and equation based on energy balance succeed in describing the electrowetting response of potential with significant contact angle hysteresis. The CAH in EWOD, ranging from 0o to about 20o in electrowetting cycle, increases with the increase of voltage and climbs up to about 20o when voltage is increased to about 38 V, and then decreases to zero with the further increase of voltage.
Keywords:  contact angle hysteresis      electrowetting      energy balance  
Received:  25 December 2014      Revised:  11 March 2015      Accepted manuscript online: 
PACS:  68.08.Bc (Wetting)  
  68.08.-p (Liquid-solid interfaces)  
  68.03.Cd (Surface tension and related phenomena)  
Fund: Project supported by the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2011752).
Corresponding Authors:  Zhao Rui     E-mail:

Cite this article: 

Zhao Rui (赵瑞), Liu Qi-Chao (刘启超), Wang Ping (王评), Liang Zhong-Cheng (梁忠诚) Contact angle hysteresis in electrowetting on dielectric 2015 Chin. Phys. B 24 086801

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