Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2009-10-30
Physics
Condensed Matter
Soft Condensed Matter
24 pages, 5 figures, To appear in Langmuir. The supporting movies can be found at: http://www.mpikg-golm.mpg.de/th/people/hali
Scientific paper
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 large control over the fluid dynamics. Unfortunately, these wetting transitions are usually prevented by surface energy barriers. We demonstrate here a new and simple design paradigm, consisting of parallel grooves of appropriate aspect ratio, that allows for a controlled, barrierless, and reversible switching of the wetting states upon the application of electrowetting. We report a direct observation of the barrierless dynamical pathway for the reversible transitions between the Wenzel (collapsed) and the Cassie-Baxter (suspended) states and present a theory that accounts for these transitions, including detailed lattice-Boltzmann simulations.
Bastiaansen C. W. M.
Broer D. J.
Hermans K.
Kusumaatmaja Halim
Pierre-Louis Olivier
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