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DY: Fachverband Dynamik und Statistische Physik

DY 58: Poster - Fluids

DY 58.5: Poster

Donnerstag, 19. März 2015, 16:00–18:00, Poster A

Sedimentation stacking diagram of colloidal mixtures under gravity — •Daniel de las Heras and Matthias Schmidt — Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany

The observation of stacks of distinct layers in a colloidal or liquid mixture in sedimentation--diffusion--equilibrium is a striking consequence of bulk phase separation. Drawing quantitative conclusions about the phase diagram is, however, very delicate. Here we present a general theory to obtain a unique stacking diagram of all possible stacks under gravity. Simple bulk phase diagrams generically lead to complex stacking diagrams. We also extend the Gibbs phase rule to determine the maximum number of sedimented layers under gravity.

References:

[1] D. de las Heras, and M. Schmidt, Soft Matter, 9, 8636, (2013)

[2] D. de las Heras, and M. Schmidt, Accepted in J. Phys: Condens. Matter, (2014)