Dynamical theory of the inverted cheerios effect.
Soft Matter
; 13(35): 6000-6010, 2017 Sep 13.
Article
em En
| MEDLINE
| ID: mdl-28776051
ABSTRACT
Recent experiments have shown that liquid drops on highly deformable substrates exhibit mutual interactions. This is similar to the Cheerios effect, the capillary interaction of solid particles at a liquid interface, but now the roles of solid and liquid are reversed. Here we present a dynamical theory for this inverted Cheerios effect, taking into account elasticity, capillarity and the viscoelastic rheology of the substrate. We compute the velocity at which droplets attract, or repel, as a function of their separation. The theory is compared to a simplified model in which the viscoelastic dissipation is treated as a localized force at the contact line. It is found that the two models differ only at small separation between the droplets, and both of them accurately describe experimental observations.
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MEDLINE
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En
Ano de publicação:
2017
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Article