Sbragaglia Mauro, Peters Alisia M, Pirat Christophe, Borkent Bram M, Lammertink Rob G H, Wessling Matthias, Lohse Detlef
Physics of Fluids, Faculty of Science and Technology, Impact and Mesa{+} Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Phys Rev Lett. 2007 Oct 12;99(15):156001. doi: 10.1103/PhysRevLett.99.156001.
In some cases water droplets can completely wet microstructured superhydrophobic surfaces. The dynamics of this rapid process is analyzed by ultrahigh-speed imaging. Depending on the scales of the microstructure, the wetting fronts propagate smoothly and circularly or-more interestingly-in a stepwise manner, leading to a growing square-shaped wetted area: entering a new row perpendicular to the direction of front propagation takes milliseconds, whereas once this has happened, the row itself fills in microseconds ("zipping"). Numerical simulations confirm this view and are in quantitative agreement with the experiments.
在某些情况下，水滴能够完全润湿微结构化的超疏水表面。通过超高速成像分析了这一快速过程的动力学。根据微结构的尺度，润湿前沿以平滑且呈圆形的方式传播，或者更有趣的是呈阶梯状传播，从而导致方形的润湿面积不断增大：进入垂直于前沿传播方向的新行需要数毫秒，而一旦发生这种情况，该行自身在微秒内就会填满（“拉链式”）。数值模拟证实了这一观点，并与实验在定量上相符。
