论文标题
观察由于不均匀的电场引起的接触角磁滞
Observation of contact angle hysteresis due to inhomogeneous electric fields
论文作者
论文摘要
静态接触角滞后（CAH）广泛归因于表面粗糙度和化学污染。在后一种情况下，化学缺陷会产生自由能的屏障，以防止接触线运动。电网研究表明，电场改变表面自由能景观的能力相似。然而，电场的明显静态CAH的增加仍然看不见。在这里，我们报告了电解滞后的观察和理论分析。这种现象使CAH的连续和动态控制不仅用于基本研究，而且还可以制造出粘性的表面以进行样品收集。
Static contact angle hysteresis (CAH) is widely attributed to surface roughness and chemical contamination. In the latter case, chemical defects create free-energy barriers that prevent the contact line motion. Electrowetting studies have demonstrated the similar ability of electric fields to alter the surface free-energy landscape. Yet, the increase of apparent static CAH by electric fields remains unseen. Here, we report the observation and theoretical analysis of electrowetting hysteresis. This phenomenon enables the continuous and dynamic control of CAH, not only for fundamental studies but also to manufacture sticky-on-demand surfaces for sample collection.
