Tang Qiang, Zhang Zongtang, Zhang Jia-Han, Tang Feiran, Wang Chengjun, Cui Xiaxia
School of Artificial Intelligence, Anhui University of Science and Technology, Huainan 232000, China.
Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
Micromachines (Basel). 2022 Dec 15;13(12):2229. doi: 10.3390/mi13122229.
Charged droplets driven by Coulomb force are an important part of a droplet-based micro reactor. In this study, we realized the rapid oscillatory motion of droplets both in oil and on superhydrophobic surface by injecting charges through corona discharge. Distinct from the oscillatory motion of water droplets under a DC electric field, charge injection can make the motion of water droplets more flexible. A droplet in the oil layer can move up and down regularly under the action of corona discharge, and the discharge voltage can control the movement period and height of the droplet. In addition, the left-right translation of droplets on a superhydrophobic surface can be achieved by injecting charges into the hydrophobic film surface through corona discharge. Two kinds of droplet motion behaviors are systematically analyzed, and the mechanism of droplet motion is explained. The present results could help establish new approaches to designing efficient machines in microfluidics and micromechanical equipment.
由库仑力驱动的带电液滴是基于液滴的微反应器的重要组成部分。在本研究中，我们通过电晕放电注入电荷，实现了油中以及超疏水表面上液滴的快速振荡运动。与直流电场下水滴的振荡运动不同，电荷注入可使水滴的运动更加灵活。油层中的液滴在电晕放电作用下可进行有规律的上下移动，放电电压可控制液滴的运动周期和高度。此外，通过电晕放电向超疏水膜表面注入电荷，可实现液滴在超疏水表面上的左右平移。系统分析了两种液滴运动行为，并解释了液滴运动的机制。目前的结果有助于建立微流体和微机械设备中高效机器设计的新方法。
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