We report irreversible Cassie–Wenzel wetting transition on a nanostructured superhydrophobic surface employing surface acoustic wave (SAW) vibration. The transition is achieved upon penetration of the liquid into the nanogrooves driven by the inertial energy of the drop imparted by the SAW. However, the filling up of nanopores imposes an energy barrier () to the transition, which requires the displacement of the initial solid–air interface inside the pores with a solid–liquid interface. We unravel that the relative magnitudes of the input acoustic energy (), and this energy barrier, hence, dictate the occurrence of the wetting transition, with the irreversibility in the transition, therefore, being explained from energy minimization of the system following the transition. In addition, observing the dynamics of the wetting front allowed the different regimes of the wetting transition process to be identified.
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Cassie–Wenzel wetting transition on nanostructured superhydrophobic surfaces induced by surface acoustic waves
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2 March 2020
Research Article|
March 03 2020
Cassie–Wenzel wetting transition on nanostructured superhydrophobic surfaces induced by surface acoustic waves
A. Sudeepthi;
A. Sudeepthi
1
Micro Nano Bio-Fluidics Unit, Fluid Systems Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras
, Chennai 600036, India
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L. Yeo
;
L. Yeo
2
Micro/Nanophysics Research Laboratory, School of Engineering, Royal Melbourne Institute of Technology (RMIT University)
, Melbourne, Victoria 3001, Australia
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A. K. Sen
A. K. Sen
a)
1
Micro Nano Bio-Fluidics Unit, Fluid Systems Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras
, Chennai 600036, India
a)Author to whom correspondence should be addressed: ashis@iitm.ac.in
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a)Author to whom correspondence should be addressed: ashis@iitm.ac.in
Appl. Phys. Lett. 116, 093704 (2020)
Article history
Received:
January 16 2020
Accepted:
February 23 2020
Citation
A. Sudeepthi, L. Yeo, A. K. Sen; Cassie–Wenzel wetting transition on nanostructured superhydrophobic surfaces induced by surface acoustic waves. Appl. Phys. Lett. 2 March 2020; 116 (9): 093704. https://doi.org/10.1063/1.5145282
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