蒸发 sessile 液滴的自充电与自推进耦合
Coupled self-charging and self-propulsion of evaporating sessile droplets
- Okinawa Institute of Science and Technology Graduate University（冲绳科学技术大学院大学）
- Max Planck Institute for Polymer Research（马克斯·普朗克高分子研究所）
- King Abdullah University of Science and Technology (KAUST)（阿卜杜拉国王科技大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究揭示蒸发水滴的自充电驱动其自发自推进，产生自回避轨迹，并形成交替极性的电荷图案，对喷墨打印等精度要求高的工艺有重要影响。
AI中文摘要：
蒸发中的 sessile 水滴普遍会沉积表面电荷，同时自身也变成自充电状态——尽管这一现象具有潜在的重要后果，却仍未得到充分重视。在此，我们研究了其中一个后果：由自充电驱动的液滴自推进。这种自推进在无外部刺激的情况下自发产生，并产生自回避轨迹，可将液滴移动其自身直径的数倍。我们的结果对需要空间精度的工艺（如喷墨打印）具有重要的实际意义。自充电与自推进之间的耦合产生了以交替极性为特征的马赛克表面电荷图案，我们利用基于双电层性质的物理模型对此进行了解释。
英文摘要：
Evaporating sessile water droplets universally deposit surface charges while simultaneously becoming self-charged---a phenomenon that remains under-appreciated despite its potentially important consequences. Here, we investigate one such consequence: droplet self-propulsion driven by self-charging. This self-propulsion arises spontaneously in the absence of external stimuli and produces self-avoiding trajectories that can displace droplets by many times their own diameter. Our results have important practical implications for processes requiring spatial precision, such as inkjet printing. The coupling between self-charging and self-propulsion produces mosaic surface charge patterns characterized by alternating polarities, which we explain with a physical model based on properties of the electric double layer.
