Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 25: Posters - Soft Particles, Microswimmers, Microfluidics

DY 25.6: Poster

Dienstag, 21. März 2017, 18:15–21:00, P3

Transport of ring polymers in microfluidic channels: A comparison to their linear counterparts — •Lisa Weiß¹, Arash Nikoubashman², and Christos N. Likos¹ — ¹Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria — ²Institute of Physics, Johannes Gutenberg University, Mainz, Staudingerweg 7, 55128 Mainz, Germany

Ring polymers are an important class of biological and synthetic macromolecules. Due to the lack of free ends, they are expected to show distinct behaviour compared to their linear counterparts, as for example with respect to migration mechanisms, rheology or disentanglement. This simulation study aims at addressing the question, whether those two are transported distinctly in microfluidic devices. Since many biological ring polymers are in aqueous solution hydrodynamics is taken into account by a simulation method called Multi-Particle Collision Dynamics while the polymer itself is treated via Molecular Dynamics. We establish the existene of marked differences in the density profiles between linear chains and their cyclic counterpart in a Hagen-Poiseuille flow profile. In addition, we investigate the effects of polymer rigidity on their transport properties, which lead to a pronounced difference regarding depletion close to walls. On this basis we suggest possibilities to utilise these features as a means to separate the two architectures in microfluidic devices.