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Superhydrophibicity as a Multiscale Phenomenon



Michael Nosonovsky


Wetting of superhydrophobic surfaces is studied as a multiscale process involving the macroscale (water droplet size), microscale (surface texture size), and nanoscale. It is shown that proper understanding of the contact angle hysteresis and the Cassie-Wenzel transition can be achieved and an apparent contradiction between the kinetic and thermodynamic descriptions can be resolved, if wetting is considered as a multiscale process. Macroscale parameters, such as the contact angle and contact angle hysteresis, cannot be determined from a closed set of macroscale equations, but depend also upon micro- and nanoscale parameters. The validity of the Wenzel and Cassie equations is discussed and generalized Wenzel and Cassie equations are proposed.


contact angle, superhydrophobic surfaces


Nosonovsky, M. (2008), Superhydrophibicity as a Multiscale Phenomenon, Langmuir (Accessed May 19, 2024)


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Created October 16, 2008