Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.
University of Chinese Academy of Sciences, 100049, Beijing, P. R. China.
Nat Commun. 2019 Mar 5;10(1):950. doi: 10.1038/s41467-019-08919-2.
Droplet impacting and bouncing off solid surface plays a vital role in various biological/physiological processes and engineering applications. However, due to a lack of accurate control of force transmission, the maneuver of the droplet movement and energy conversion is rather primitive. Here we show that the translational motion of an impacting droplet can be converted to gyration, with a maximum rotational speed exceeding 7300 revolutions per minute, through heterogeneous surface wettability regulation. The gyration behavior is enabled by the synergetic effect of the asymmetric pinning forces originated from surface heterogeneity and the excess surface energy of the spreading droplet after impact. The findings open a promising avenue for delicate control of liquid motion as well as actuating of solids.
液滴冲击和弹离固体表面在各种生物/生理过程和工程应用中起着至关重要的作用。然而，由于力传递的精确控制不足，液滴运动和能量转换的操作相当原始。在这里，我们通过非均匀表面润湿性调节展示了，冲击液滴的平移运动可以转化为旋转，最大旋转速度超过每分钟 7300 转。这种旋转行为是由源自表面非均匀性的不对称钉扎力和冲击后扩展液滴的过剩表面能的协同作用实现的。这些发现为精细控制液体运动以及固体致动开辟了一条有前途的途径。
