Regensburg 2019 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 27: Complex Fluids and Colloids, Micelles and Vesicles (joint session CPP/DY)
DY 27.8: Talk
Wednesday, April 3, 2019, 11:45–12:00, H14
Semi-dilute mixtures of circular and linear polymers - towards novel separation techniques — •Lisa B. Weiss1, Christos N. Likos1, and Arash Nikoubashman2 — 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna,Austria — 2Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany
Linear polymers have been extensively studied in various concentration regimes, at rest and when exposed to a variety of flow fields. Recently, this interest extended to ring polymers, focusing on melts and dilute solutions. When diluted and at rest, rings show the same scaling behavior as chains, but when exposed to non-equilibrium conditions astonishing differences become apparent uniquely related to their topology. Furthermore, entangled rings show in equilibrium as well as when sheared marked differences compared to their linear counter part. However, the semi-dilute regime of pure ring polymer solutions and topological mixtures of rings and chains have been sparsely investigated so far. To resolve this, we simulate pure linear and ring polymer solutions and their mixtures around the overlap concentration at rest and under Hagen-Poiseuille flow. To correctly take into account hydrodynamic interactions, we employ the multi-particle collision algorithm. Mixtures of chains and rings show a distinct cross stream migration behavior at any investigated concentration, offering a promising route towards novel separation techniques. In particular, we observed a pronounced propensity of the rings to focus at the channel center while the chains populate the region close to the confining walls.