The modified Cassie’s equation and contact angle hysteresis

Xianmin Xu, Xiaoping Wang

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


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. © 2012 Springer-Verlag.
Original languageEnglish (US)
Pages (from-to)299-306
Number of pages8
JournalColloid and Polymer Science
Issue number2
StatePublished - Aug 29 2012
Externally publishedYes


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