Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India.
J Colloid Interface Sci. 2011 Nov 15;363(2):640-5. doi: 10.1016/j.jcis.2011.07.077. Epub 2011 Jul 31.
The present study elucidates the effects of included submicron-sized particles on the wetting behavior of sessile droplets under the influence of applied electric field in an electro-wetting-on-dielectric (EWOD) configuration. A thermodynamic description using an energy minimization approach is used to analyze the experimental results related to the effects of the included particles on the EWOD phenomenon, considering the effects of line tension as well. The effects of particle size and concentration on interfacial areas are included in the model to analyze the wetting characteristics. Experiments are also conducted with submicron-sizes latex beads, in an effort to elucidate the related phenomena. It is further postulated that these beads act as suspended dielectrics in the droplet, thereby mimicking a system of two capacitors in series. An effective electrical permittivity of the composite medium is used to study the experimental results related to contact angle changes at different concentrations and diameters of submicron particles in the droplet.
本研究阐明了在电润湿-介质（EWOD）配置中施加电场的影响下，包含的亚微米级颗粒对固着液滴润湿行为的影响。采用能量最小化方法的热力学描述用于分析与包含颗粒对 EWOD 现象的影响相关的实验结果，同时考虑线张力的影响。该模型还包括颗粒尺寸和浓度对界面面积的影响，以分析润湿特性。实验还使用亚微米乳胶珠进行，以阐明相关现象。进一步假设这些珠子在液滴中充当悬浮电介质，从而模拟两个串联电容器的系统。采用复合介质的有效介电常数来研究与液滴中不同浓度和直径的亚微米颗粒的接触角变化相关的实验结果。
