The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China.
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China.
Langmuir. 2021 Dec 21;37(50):14697-14702. doi: 10.1021/acs.langmuir.1c02462. Epub 2021 Dec 13.
Droplet manipulation is the cornerstone of many modern technologies. It is still challenging to drive the droplet motion on nonslippery surfaces flexibly. We present a droplet manipulation method on nonslippery polymer surfaces based on the corona discharge. With the corona discharge of two-needle electrodes with opposite polarities, the droplet's charge polarity can be switched, which results in the directionally droplet transport on a charged polymer surface with the oscillation. Here, such droplet behaviors are presented in detail. Dependence of the motion on the critical distance and driving distance between the droplet and the needle electrode is revealed. The driving mechanism is verified by experiments and simulations. This work enriches the droplet manipulation techniques on nonslippery surfaces for various applications, such as combinatory chemistry, biochemical, and medical detection.
液滴操控是许多现代技术的基础。然而，在非滑润表面上灵活地驱动液滴运动仍然具有挑战性。我们提出了一种基于电晕放电的非滑润聚合物表面上的液滴操控方法。通过具有相反极性的双针电极的电晕放电，可以改变液滴的电荷极性，从而使液滴在带电荷的聚合物表面上以振荡的方式定向传输。在这里，详细介绍了这种液滴行为。揭示了运动对液滴和针电极之间的临界距离和驱动距离的依赖性。通过实验和模拟验证了驱动机制。这项工作丰富了在各种应用中，如组合化学、生化和医疗检测中，在非滑润表面上的液滴操控技术。
