Mechanism of contact angle saturation and an energy-based model for electrowetting  

作　　者：赵瑞 梁忠诚 

机构地区：[1]College of Optoelectronic Engineering,Center of Optofluidic Technology,Nanjing University of Posts and Telecommunications

出　　处：《Chinese Physics B》2016年第6期360-365,共6页中国物理B（英文版）

基　　金：Project supported by the Fund from the Research Center of Optical Communications Engineering&Technology,Jiangsu Province,China(Grant No.ZSF0402)

摘　　要：Electrowetting,as a well-known approach to increasing droplet wettability on a solid surface by electrical bias,has broad applications.However,it is limited by contact angle saturation at large voltage.Although several debated hypotheses have been proposed to describe it,the physical origin of contact angle saturation still remains obscure.In this work,the physical factors responsible for the onset of contact angle saturation are explored,and the correlated theoretical models are established to characterize electrowetting behavior.Combination of the proper 3-phase system employed succeeds in dropping the saturating contact angle below 25？,and validates that the contact angle saturation is not a result of devicerelated imperfection.Electrowetting,as a well-known approach to increasing droplet wettability on a solid surface by electrical bias,has broad applications.However,it is limited by contact angle saturation at large voltage.Although several debated hypotheses have been proposed to describe it,the physical origin of contact angle saturation still remains obscure.In this work,the physical factors responsible for the onset of contact angle saturation are explored,and the correlated theoretical models are established to characterize electrowetting behavior.Combination of the proper 3-phase system employed succeeds in dropping the saturating contact angle below 25？,and validates that the contact angle saturation is not a result of devicerelated imperfection.

关 键 词：ELECTROWETTING contact angle SATURATION 

分 类 号：O487[理学—固体物理]