Spontaneous droplets gyrating via asymmetric self-splitting on heterogeneous surfaces
Spontaneous droplets gyrating via asymmetric self-splitting on heterogeneous surfaces
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通过非对称自分裂在异质表面上自发旋转的液滴
DOI：
10.1038/s41467-019-08919-2
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发表时间：
2019-03-05
影响因子：
16.6
通讯作者：
Song, Yanlin
中科院分区：
文献类型：
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作者：
Li, Huizeng;Fang, Wei;Song, Yanlin
液滴在固体表面的撞击和反弹在各种生物/生理过程和工程应用中起着至关重要的作用。然而，由于缺乏对力传递的精确控制，液滴的运动和能量转换的机动相当原始。在这里，我们表明，通过非均匀表面润湿性调节，撞击液滴的平移运动可以转换为旋转，最大转速超过每分钟7300转。旋转行为是由表面非均匀产生的不对称钉扎力和撞击后扩散液滴的过剩表面能共同作用的。这一发现为精细控制液体运动以及固体的驱动开辟了一条很有希望的途径。
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.