Journal
COLLOID AND POLYMER SCIENCE
Volume 291, Issue 2, Pages 299-306Publisher
SPRINGER
DOI: 10.1007/s00396-012-2748-1
Keywords
The Cassie's equation; Wetting hysteresis; Homogenization
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Funding
- King Abdullah University of Science and Technology (KAUST) [SA-C0040/UK-C0016]
- Hong Kong RGC-CERG [603107, 604209]
- Chinese NSFC [11001260]
- National Center for Mathematics and Interdisciplinary Sciences, CAS
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In 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.
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