Fully reversible transition from Wenzel to Cassie-Baxter states on corrugated superhydrophobic surfaces

Langmuir : the ACS Journal of Surfaces and Colloids
Robert J VranckenDirk J Broer

Abstract

Liquid drops on textured surfaces show different dynamical behaviors depending on their wetting states. They are extremely mobile when they are supported by composite solid-liquid-air interfaces (Cassie-Baxter state) and immobile when they fully wet the textured surfaces (Wenzel state). By reversibly switching between these two states, it will be possible to achieve control over the fluid dynamics. Unfortunately, these wetting transitions are usually prevented by surface energy barriers. We demonstrate here a new, simple design paradigm consisting of parallel grooves with an appropriate aspect ratio that allows for the controlled, barrierless, reversible switching of the wetting states upon application of electrowetting. We report a direct observation of the barrierless dynamical pathway for the reversible transitions between the Wenzel (collapsed) and Cassie-Baxter (suspended) states and present a theory that accounts for these transitions, including detailed lattice Boltzmann simulations.

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Citations

Jul 21, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Niru Kumari, Suresh V Garimella
Feb 6, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Daiki MurakamiAtsushi Takahara
Jan 20, 2012·Advances in Colloid and Interface Science·A J B Milne, A Amirfazli
Feb 26, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·George PashosAndreas G Boudouvis
Dec 4, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Azar ShahrazKristen A Fichthorn
Oct 4, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Florian LapierreVincent Thomy
Jun 20, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Alberto GiacomelloCarlo Massimo Casciola
Dec 4, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Donghyun SeoYoungsuk Nam
Sep 20, 2018·Physical Chemistry Chemical Physics : PCCP·Senbo XiaoJianying He
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Apr 5, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Nikolaos T ChamakosAthanasios G Papathanasiou
Sep 6, 2018·ACS Applied Materials & Interfaces·Divya PanchanathanGareth H McKinley
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Mar 22, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Michail E KavousanakisAthanasios G Papathanasiou
Jan 9, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Vartika PariharSunando Dasgupta
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Nov 29, 2017·ACS Nano·Emanuele LisiCarlo Massimo Casciola

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