Regensburg 2016 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster: Wetting, Nano- and Microfluidics
CPP 46.6: Poster
Wednesday, March 9, 2016, 18:15–21:00, Poster B2
Contact Line Dynamics and Hydrodynamic Boundary Conditions in Stepped Liquid Films — •Marco Rivetti1, Thomas Salez2, Michael Benzaquen2, Elie Raphaël2, and Oliver Bäumchen1 — 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), Göttingen, Germany — 2UMR Gulliver, CNRS and ESPCI ParisTech, PSL University, Paris, France
For flows on the micro- and nanoscale, the physics of the contact line as well as the hydrodynamic boundary condition at a solid surface play a crucial role. In past few years much has been learned about both phenomena from flows that are driven by capillary forces. We here discuss some recent results involving thin liquid films which exhibit slip or no-slip boundary conditions. In the absence of slip, the relaxation of a liquid nanostripe on a smooth, hydrophilic substrate has evidenced the occurrence of, both, stationary and receding contact line regimes [1]. Self-similarity of the liquid profiles in the stationary regime has been proved, and a universal transition between the two regimes has emerged by rescaling with regard to the viscosity, surface tension and film thickness. In the second part we discuss the relaxation of initially perturbed liquid surfaces [2], i.e. stepped liquid films in the absence of contact lines. We find strong evidence that this relaxation process is also sensitive to the slip boundary condition at the solid/liquid interface. Thin film models comprising slip enable a quantification of the slip length of viscous liquids of various molecular properties. [1] Rivetti et al., Soft Matter 11 (2015) [2] McGraw et al., Phys. Rev. Lett. 109, 128303 (2012)