TY - JOUR
T1 - Ricocheting Droplets Moving on Super-Repellent Surfaces
AU - Pan, Shuaijun
AU - Guo, Rui
AU - Richardson, Joseph J.
AU - Berry, Joseph D.
AU - Besford, Quinn A.
AU - Björnmalm, Mattias
AU - Yun, Gyeongwon
AU - Wu, Ruoxi
AU - Lin, Zhixing
AU - Zhong, Qi Zhi
AU - Zhou, Jiajing
AU - Sun, Qiang
AU - Li, Jianhua
AU - Lu, Yanbing
AU - Dong, Zhichao
AU - Banks, Margaret Katherine
AU - Xu, Weijian
AU - Jiang, Jianhui
AU - Jiang, Lei
AU - Caruso, Frank
N1 - Publisher Copyright:
© 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/11/1
Y1 - 2019/11/1
N2 - Droplet bouncing on repellent solid surfaces (e.g., the lotus leaf effect) is a common phenomenon that has aroused interest in various fields. However, the scenario of a droplet bouncing off another droplet (either identical or distinct chemical composition) while moving on a solid material (i.e., ricocheting droplets, droplet billiards) is scarcely investigated, despite it having fundamental implications in applications including self-cleaning, fluid transport, and heat and mass transfer. Here, the dynamics of bouncing collisions between liquid droplets are investigated using a friction-free platform that ensures ultrahigh locomotion for a wide range of probing liquids. A general prediction on bouncing droplet–droplet contact time is elucidated and bouncing droplet–droplet collision is demonstrated to be an extreme case of droplet bouncing on surfaces. Moreover, the maximum deformation and contact time are highly dependent on the position where the collision occurs (i.e., head-on or off-center collisions), which can now be predicted using parameters (i.e., effective velocity, effective diameter) through the concept of an effective interaction region. The results have potential applications in fields ranging from microfluidics to repellent coatings.
AB - Droplet bouncing on repellent solid surfaces (e.g., the lotus leaf effect) is a common phenomenon that has aroused interest in various fields. However, the scenario of a droplet bouncing off another droplet (either identical or distinct chemical composition) while moving on a solid material (i.e., ricocheting droplets, droplet billiards) is scarcely investigated, despite it having fundamental implications in applications including self-cleaning, fluid transport, and heat and mass transfer. Here, the dynamics of bouncing collisions between liquid droplets are investigated using a friction-free platform that ensures ultrahigh locomotion for a wide range of probing liquids. A general prediction on bouncing droplet–droplet contact time is elucidated and bouncing droplet–droplet collision is demonstrated to be an extreme case of droplet bouncing on surfaces. Moreover, the maximum deformation and contact time are highly dependent on the position where the collision occurs (i.e., head-on or off-center collisions), which can now be predicted using parameters (i.e., effective velocity, effective diameter) through the concept of an effective interaction region. The results have potential applications in fields ranging from microfluidics to repellent coatings.
KW - contact time
KW - droplet bouncing
KW - interfacial phenomena
KW - repellent coatings
KW - surface science
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U2 - 10.1002/advs.201901846
DO - 10.1002/advs.201901846
M3 - Article
AN - SCOPUS:85073794736
SN - 2198-3844
VL - 6
JO - Advanced Science
JF - Advanced Science
IS - 21
M1 - 1901846
ER -