KAUST Grant NumberSA-C0040/UK-C0016
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AbstractIn this paper, we derive a modified Cassie's equation for wetting on chemically patterned surfaces from a homogenization approach. The derivation reveals that effective contact angle is a local average of the static contact angle along the contact line which describes all possible equilibrium states including the local minimum of the free energy of the system. The usual Cassie's state which corresponds to the global minimum is only a special case. We then discuss the contact angle hysteresis on chemically patterned surfaces. © 2012 Springer-Verlag.
CitationXu X, Wang X (2012) The modified Cassie’s equation and contact angle hysteresis. Colloid and Polymer Science 291: 299–306. Available: http://dx.doi.org/10.1007/s00396-012-2748-1.
SponsorsThis publication was based on work supported in part by Award No SA-C0040/UK-C0016, made by King Abdullah University of Science and Technology (KAUST), Hong Kong RGC-CERG grants 603107 and 604209, Chinese NSFC project 11001260, and by National Center for Mathematics and Interdisciplinary Sciences, CAS.
JournalColloid and Polymer Science