A general stability criterion for droplets on structured substrates

Martin Brinkmann, Jan Kierfeld, Reinhard Lipowsky

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Wetting morphologies on solid substrates, which may be chemically or topographically structured, are studied theoretically by variation of the free energy which contains contributions from the substrate surface, the fluid–fluid interface and the three-phase contact line. The first variation of this free energy leads to two equations—the classical Laplace equation and a generalized contact line equation—which determine stationary wetting morphologies. From the second variation of the free energy we derive a general spectral stability criterion for stationary morphologies. In order to incorporate the constraint that the displaced contact line must lie within the substrate surface, we consider only normal interface displacements but introduce a variation of the domains of parametrization.
Original languageEnglish
Pages (from-to)11547-11573
JournalJournal of Physics A: Mathematical Nuclear and General
Volume37
Issue number48
Early online date17 Nov 2004
DOIs
Publication statusPublished - 3 Dec 2004
Externally publishedYes

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