Superhydrophobic-like tunable droplet bouncing on slippery liquid interfaces

Chonglei Hao, Jing Li, Yuan Liu, Xiaofeng Zhou, Yahua Liu, Rong Liu, Lufeng Che, Wenzhong Zhou, Dong Sun, Lawrence Li, Lei Xu and Zuankai Wang ()
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Chonglei Hao: City University of Hong Kong
Jing Li: City University of Hong Kong
Yuan Liu: Chinese University of Hong Kong
Xiaofeng Zhou: Science and Technology on Microsystem Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Yahua Liu: City University of Hong Kong
Rong Liu: City University of Hong Kong
Lufeng Che: Science and Technology on Microsystem Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Wenzhong Zhou: City University of Hong Kong
Dong Sun: City University of Hong Kong
Lawrence Li: City University of Hong Kong
Lei Xu: Chinese University of Hong Kong
Zuankai Wang: City University of Hong Kong

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Droplet impacting on solid or liquid interfaces is a ubiquitous phenomenon in nature. Although complete rebound of droplets is widely observed on superhydrophobic surfaces, the bouncing of droplets on liquid is usually vulnerable due to easy collapse of entrapped air pocket underneath the impinging droplet. Here, we report a superhydrophobic-like bouncing regime on thin liquid film, characterized by the contact time, the spreading dynamics, and the restitution coefficient independent of underlying liquid film. Through experimental exploration and theoretical analysis, we demonstrate that the manifestation of such a superhydrophobic-like bouncing necessitates an intricate interplay between the Weber number, the thickness and viscosity of liquid film. Such insights allow us to tune the droplet behaviours in a well-controlled fashion. We anticipate that the combination of superhydrophobic-like bouncing with inherent advantages of emerging slippery liquid interfaces will find a wide range of applications.

Date: 2015
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DOI: 10.1038/ncomms8986

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