TY - JOUR
T1 - Nonspecular Reflection of Droplets
AU - Zhu, Pingan
AU - Chen, Chengmin
AU - Nandakumar, Krishnaswamy
AU - Wang, Liqiu
N1 - Publisher Copyright:
© 2020 Wiley-VCH GmbH
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/1/21
Y1 - 2021/1/21
N2 - The bouncing of droplets on super-repellent surfaces normally resembles specular reflection that obeys the law of reflection. Here, the nonspecular reflection of droplet impingement onto solid surfaces with a dimple for energy-efficient, omnidirectional droplet transport is reported. With the dimple of the radius being comparable to that of the droplet, all the symmetries in the law of reflection can be broken down so that the droplet is endowed with a translational velocity finely tunable in both its direction and magnitude simply by varying the radii of the droplet and the dimple, the impinging position, and droplet Weber number. Tailoring the initial and translational velocity of impinging droplets would steer their reflected trajectories at will, thus enabling versatile droplet manipulation including trapping, shedding, antigravity transport, targeted positioning, and on-demand coalescence of droplets.
AB - The bouncing of droplets on super-repellent surfaces normally resembles specular reflection that obeys the law of reflection. Here, the nonspecular reflection of droplet impingement onto solid surfaces with a dimple for energy-efficient, omnidirectional droplet transport is reported. With the dimple of the radius being comparable to that of the droplet, all the symmetries in the law of reflection can be broken down so that the droplet is endowed with a translational velocity finely tunable in both its direction and magnitude simply by varying the radii of the droplet and the dimple, the impinging position, and droplet Weber number. Tailoring the initial and translational velocity of impinging droplets would steer their reflected trajectories at will, thus enabling versatile droplet manipulation including trapping, shedding, antigravity transport, targeted positioning, and on-demand coalescence of droplets.
KW - droplet impact
KW - liquid repellency
KW - nonspecular reflection of droplets
KW - omnidirectional droplet transport
KW - symmetry breaking
UR - http://www.scopus.com/inward/record.url?scp=85097840698&partnerID=8YFLogxK
U2 - 10.1002/smll.202006695
DO - 10.1002/smll.202006695
M3 - 文章
C2 - 33345437
AN - SCOPUS:85097840698
SN - 1613-6810
VL - 17
JO - Small
JF - Small
IS - 3
M1 - 2006695
ER -