Journal
LANGMUIR
Volume 29, Issue 43, Pages 13129-13134Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la402481b
Keywords
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Funding
- Lebanese CNRS
- French CNRS
- region Nord-Pas-de-Calais through the CPER-CIA project
- FEDER through the CPER-CIA project
- French government program [ANR-11-EQUIPEX-0025]
- Ministry of Defense
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Many applications involving superhydrophobic materials require accurate control and monitoring of wetting states and wetting transitions. Such monitoring is usually done by optical methods, which are neither versatile nor integrable. This letter presents an alternative approach based on acoustic measurements. An acoustic transducer is integrated on the back side of a superhydrophobic silicon surface on which water droplets are deposited. By analyzing the reflection of longitudinal acoustic waves at the composite liquid-solid-vapor interface, we show that it is possible to track the local evolution of the Cassie-to-Wenzel wetting transition efficiently, as induced by evaporation or the electrowetting actuation of droplets.
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