Analytical prediction of electrowetting-induced jumping motion for droplets on textured hydrophobic substrates: Effects of the wetting states
Analytical prediction of electrowetting-induced jumping motion for droplets on textured hydrophobic substrates: Effects of the wetting states
复制标题
纹理疏水基底上电润湿引起的液滴跳跃运动的分析预测：润湿状态的影响
DOI：
10.1063/5.0082832
复制
发表时间：
2020-07
影响因子：
4.6
通讯作者：
Shuo Chen
中科院分区：
文献类型：
--
作者：
Kaixuan Zhang;Jiayi Zhao;Yang Liu;Shuo Chen
在电润湿中，施加的电压可以通过改变三相界面张力的固有平衡来诱导单个液滴的铺展、滑动甚至跳跃。近几十年来，该技术已被广泛用于微流体和芯片实验室设备中的液滴操纵。在本文中，我们提出了一个分析预测的跳跃速度的液滴进行电润湿的纹理疏水表面具有不同的润湿状态。特别地，我们考虑润湿在纹理化疏水基底上的液滴，其中在液滴和基底之间施加电压。一旦电压被关闭，在电润湿期间存储在液滴中的能量被释放，并且甚至可能导致液滴的分离。初始和电润湿状态的影响，即，Cassie-Baxter态和Wenzel态对液滴跳跃速度的影响。基于能量守恒原理，分析了在不同润湿状态下，液滴表面能、接触线弹性能与液滴内部粘性耗散动能之间的能量转换关系。系统地推导了不同润湿状态下液滴跳跃速度的解析表达式。最后，得到了一个统一的形式，用于预测的电润湿诱导跳跃速度的平面和织构基板上的不同的润湿状态。该模型能够描述不同润湿条件下的跳跃运动，并得到了实验结果的验证。这项工作提供了理论上的见解，精确控制的电润湿诱导的跳跃运动的液滴纹理疏水表面。
In electrowetting, an applied electric voltage can induce spreading, sliding, or even jumping of an individual droplet by changing the intrinsic balance of the three-phase interfacial tensions. This technique has been widely used for manipulating droplets in microfluidics and by lab-on-a-chip devices in recent decades. In the present paper, we present an analytical prediction of the jumping velocity for droplets undergoing electrowetting on textured hydrophobic surfaces with different wetting states. In particular, we consider wetting a liquid droplet on a textured hydrophobic substrate with a voltage applied between the droplet and the substrate. Once the voltage is turned off, the energy stored in the droplet during electrowetting is released and could even result in the detachment of the droplet. The effects of the initial and electrowetting states, i.e., the Cassie–Baxter state and the Wenzel state, on the jumping velocity of droplets are systematically discussed. Based on energy conservation, the energy conversion between the surface energy, the elastic energy of the contact line, and the kinetic energy of droplets due to internal viscous dissipation in different wetting states is analyzed. Closed-form formulas for the jumping velocity of different droplet wetting states are systematically derived. Finally, a unified form for predicting the electrowetting-induced jumping velocity of droplets on both flat and textured substrates with different wetting states is obtained. It can describe the jumping motion under various wetting conditions, which is validated by some experimental results. This work provides theoretical insights into the accurate control of the electrowetting-induced jumping motion of droplets on textured hydrophobic surfaces.
登录
查看更多内容
疏水基底上电润湿引起的液滴跳跃运动的分析预测
影响因子：
4.6
作者：
Kaixuan Zhang;Zhen Li;Shuo Chen
通讯作者：
Shuo Chen
DOI：
10.1021/acs.langmuir.7b04162
发表时间：
2018-02
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Chensen Lin;Shuo Chen;L. Xiao;Yang Liu
通讯作者：
Chensen Lin;Shuo Chen;L. Xiao;Yang Liu
液滴撞击环表面的动力学
影响因子：
4.6
作者：
Chensen Lin;Damin Cao;Dongxiao Zhao;Ping Wei;Shuo Chen;Yang Liu
通讯作者：
Yang Liu
波纹基材上的润湿和电润湿
DOI：
10.1063/1.4984244
发表时间：
2017-06
期刊：
Physical of Fluids
影响因子：
--
作者：
Wang Z;Zhao Y P
通讯作者：
Zhao Y P
影响因子：
2.3
作者：
Bahadur, V.;Garimella, S. V.
通讯作者：
Garimella, S. V.