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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Wetting, Nano- and Microfluidics I (joint session CPP/DY, organized by CPP)

CPP 50.6: Talk

Thursday, March 10, 2016, 11:15–11:30, H42

Non-equilibrium interfacial tension during relaxation — •Markus Bier — Max Planck Institute Int. Sys. and University of Stuttgart, Germany

The concept of a non-equilibrium interfacial tension, defined via the work required to deform the system such that the interfacial area is changed while the volume is conserved, is discussed in the context of the relaxation of an initial perturbation of a colloidal fluid towards the equilibrium state. It is shown that the non-equilibrium interfacial tension is not necessarily positive, that negative non-equilibrium interfacial tensions are consistent with strictly positive equilibrium interfacial tensions and that the sign of the interfacial tension can influence the morphology of density perturbations during relaxation.

References:
[1] M. Bier and D. Arnold, Phys. Rev. E 88, 062307 (2013).
[2] M. Bier, Phys. Rev. E 92, 042128 (2015).