Characterization of the state of a droplet on a micro-textured silicon wafer using ultrasound

In this work, we propose acoustic characterization as a new method to probe wetting states on a superhydrophobic surface. The analysis of the multiple reflections of a longitudinal acoustic wave from solid-liquid and solid-vapor interfaces enables to distinguish between the two well known Cassie-Bax...

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Veröffentlicht in:Journal of applied physics 2012-11, Vol.112 (10)
Hauptverfasser: Saad, N., Dufour, R., Campistron, P., Nassar, G., Carlier, J., Harnois, M., Merheb, B., Boukherroub, R., Senez, V., Gao, J., Thomy, V., Ajaka, M., Nongaillard, B.
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Sprache:eng
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Zusammenfassung:In this work, we propose acoustic characterization as a new method to probe wetting states on a superhydrophobic surface. The analysis of the multiple reflections of a longitudinal acoustic wave from solid-liquid and solid-vapor interfaces enables to distinguish between the two well known Cassie-Baxter and Wenzel wetting configurations. The phenomenon is investigated experimentally on silicon micro-pillars superhydrophobic surfaces and numerically using a finite difference time domain method. Numerical calculations of reflection coefficients show a good agreement with experimental measurements, and the method appears as a promising alternative to optical measurement methods.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4767223