Mechanically switchable wetting on wrinkled elastomers with dual-scale roughness
- 22 January 2009
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Soft Matter
- Vol. 5 (5), 1011-1018
- https://doi.org/10.1039/b814145b
Abstract
We report the fabrication of a new superhydrophobic surface with dual-scale roughness by coating silica nanoparticles on a poly(dimethylsiloxane) (PDMS) elastomer bilayer film with micro-scaled ripples. The wetting behavior of the surface can be reversibly tuned by applying a mechanical strain, which induces the change in micro-scale roughness determined by the ripples. The dual-scale roughness promotes the wetting transition of the final dual-structure surface from Wenzel region into the Cassie region, thus, reducing the sliding angle at least three times in comparison to that from the surfaces with single-scale roughness (either from the nanoparticle film or the wrinkled PDMS film). In addition, three-times and fast-response tunability of the sliding angle by applying mechanical strain on this dual-roughness surface is demonstrated.Keywords
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