AI 中文总结
该研究发现高度非均匀电场可诱导超疏水表面铁电液滴展曲相关的接触起电，约30%实验中液滴出现类电泳运动，均匀电场下无此效应。
AI 中文摘要
超疏水表面上的铁电固着液滴可被高度非均匀电场驱动，其运动方向取决于电场符号，这表明液滴携带非零静电荷，我们认为该电荷是通过与超疏水基底界面的接触起电获得的。在均匀或准均匀电场中未观察到该现象，说明高度非均匀电场有利于液滴带电，此类电场可诱导铁电极化发生局部分畸变，进而产生局域电荷积累位点。因此，静带电可被理解为展曲诱导的接触起电，且被视为使积累电荷最小化的策略。约30%的实验中观察到类电泳运动，这意味着展曲诱导带电需要液滴尺寸、与场源的距离、基底涂层的新鲜度等难以量化的实验条件的恰当组合。当不发生带电时，可观察到与液滴极化相关的效应，如介电泳、极化流体射流喷射及类似电致伸缩的形变。
英文摘要
Ferroelectric sessile droplets on a superhydrophobic surface can be put into motion by highly non-uniform electric fields, in a direction that depends on the field sign. This indicates that droplets carry a non-vanishing electrostatic charge, which we interpret as acquired through contact electrification at the interface with the superhydrophobic substrate. This phenomenon is not observed in the presence of a uniform or quasi-uniform electric field, suggesting that droplets charging is favored in highly nonuniform fields able to induce localized distortions of the ferroelectric polarization, in turn producing localized charge accumulation sites. Electrostatic charging is thus understood as a splay-induced contact electrification and interpreted as a strategy to minimize the accumulated charge. Electrophoretic-like motion is observed in about 30% of the experiments, meaning that splay-induced charging requires the proper combination of conditions such as droplets size, distance from the field source, freshness of the substrate coating and other experimental details that are not easily quantified. When charging does not occur, effects related to droplet polarization such as dielectrophoresis, ejection of polarized fluid jets and electrostriction-like deformations are observed.
Comments32 pages, 18 figures. Links to videos are available upon request
