Wetting Tension Due to Coulombic Interaction in Charge-Related Wetting Phenomena
Wetting Tension Due to Coulombic Interaction in Charge-Related Wetting Phenomena
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DOI：
10.1021/la034163n
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发表时间：
2003-05
期刊：
影响因子：
3.9
通讯作者：
K. H. Kang;I. Kang;Choung-Mook Lee
中科院分区：
文献类型：
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作者：
K. H. Kang;I. Kang;Choung-Mook Lee
库仑相互作用对润湿的影响在电动力学的框架内阐明。将作用在弯月面上的麦克斯韦应力和渗透压积分，得到库仑对润湿张力的贡献的简明解析表达式。用热力学方法对结果进行了验证。该方法被施加到三个重要的电荷相关的润湿配置，其中液滴被放置在固体基板上。首先，当恒定电位边界条件被施加在基板表面，只有电毛细项，它代表的双电层的静电自由能有助于润湿张力。第二，在恒定电荷条件下，润湿张力包括附加的边缘效应项。结果表明，在这种情况下，润湿张力取决于三相接触线附近的界面轮廓。第三，在电润湿的情况下，润湿张力还包括边缘效应项。作为第三种情况的一个特例，恢复了Lippmann-Young方程中的润湿张力项。
The influence of Coulombic interaction on wetting is elucidated within the framework of electromechanics. The Maxwell stress and osmotic pressure acting on a meniscus are integrated to obtain a concise analytical expression for the Coulombic contribution to wetting tension. The results are verified alternatively by using a thermodynamic approach. The method is applied to three important charge-related wetting configurations in which droplets are placed on a solid substrate. First, when the constant-potential boundary condition is applied at the substrate surface, only the electrocapillary term which represents the electrostatic free energy of the electrical double layer contributes to the wetting tension. Second, in the case of the constant-charge condition, the wetting tension includes an additional edge-effect term. It is found that the wetting tension in this case is dependent on the interface profile near the three-phase contact line. Third, in the case of electrowetting on dielectrics, the wetting tension also includes the edge-effect term. The wetting-tension term appearing in the Lippmann-Young equation is recovered as a special case of the third case.