Journal
CHEMICAL ENGINEERING SCIENCE
Volume 230, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2020.116197
Keywords
Droplet impact; Anisotropic microstructures; Anisotropic pinning; Contact angle hysteresis; Hydrophobicity
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Funding
- Indian Space Research Organization (ISRO) through the Kalpana Chawla Space Technology Cell, Indian Institute of Technology Kharagpur, India [NEW/P/17-18/01]
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The study focuses on droplet impact dynamics on super-hydrophobic surfaces and finds that partial rebound phenomena, such as the formation of satellite drops, can occur even on hydrophobic surfaces.
Droplet impact dynamics on super-hydrophobic micro-structured surfaces is vital in a multitude of processes such as spray coating, cooling, and inkjet printing etc. Majority of the research has been focused on the rebound phenomena while partial rebound is relatively underreported. Recent studies indicate that partial rebound is encountered where transition of wetting state may take place on super-hydrophobic surfaces. Herein, we report that satellite drops are formed during partial rebound of droplets even on hydrophobic surfaces with unidirectional topography created using a mask-less and stamp-less fabrication process. The simultaneous capillary driven retraction along the wrinkles and the strong contact line pinning across these anisotropic substrates leads to formation of satellite drops on hydrophobic surfaces. Excess rebound energy has been evaluated as functions of contact angle, contact angle hysteresis and the maximum spreading diameter to explain partial rebound on such surfaces with potential applications in the design of novel, functional surfaces. (C) 2020 Elsevier Ltd. All rights reserved.
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