Blobs, channels and “cigars”: Morphologies of liquids at a step
Interdisciplinary Research Institute, c/o IEMN Avenue Poincaré BP 69, F-59652, Villeneuve d’Ascq, France
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Published online: 16 June 2004
We have studied the equilibria of liquid droplets wetting a step edge with an opening angle by a combination of analytical and numerical methods. Depending on the wetting properties of the substrate walls and on the liquid volume, different locally or globally stable liquid morphologies are found. Complete spreading of the liquid along the bottom edge of the step is observed at equilibrium contact angles satisfying . If the contact angle exceeds a threshold value the liquid exists in a blob-like configuration. Surprisingly, we find an intermediate regime at a sufficiently high liquid volume and in a range of contact angles , in which “cigar”-shaped configurations arise in addition to the blob. We close the paper by a detailed discussion of the stability of this novel liquid morphology.
© EDP Sciences, Società Italiana di Fisica, and Springer-Verlag, 2004