The European Physical Journal E

, Volume 22, Issue 1, pp 41–49 | Cite as

Formation and mobility of droplets on composite layered substrates

Regular Articles

Abstract.

A mesoscale fluid film placed on a solid support may break up and form droplets. In addition, droplets may exhibit spontaneous translation by modifying the wetting properties of the substrate, resulting in asymmetry in the contact angles. We examine mechanisms for droplet formation and motion on uniform and terraced landscapes, i.e., composite substrates. The fluid film stability, droplet formation and velocity are studied theoretically in the isothermal case using a lubrication approach in one spatial dimension. The droplet properties are found to involve contributions from both the terraced layer thickness and molecular interactions via the disjoining potential.

PACS.

47.55.dr Interactions with surfaces 68.08.Bc Wetting 47.55.np Contact lines 47.15.gm Thin film flows 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of CaliforniaBerkeleyUSA
  2. 2.Department of Chemical Engineering and Minerva Center for Nonlinear Physics of Complex SystemsTechnion - Israel Institute of TechnologyHaifaIsrael

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