Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 16: Droplets, Wetting, and Microfluidics (joint session DY/CPP)

DY 16.10: Talk

Monday, March 9, 2026, 17:30–17:45, ZEU/0118

Electrophoresis in charged chiral active fluids with odd viscosity — •Reinier van Buel, Bogdan Cichocki, and Jeffrey Everts — Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland

Understanding the motion of colloidal particles dissolved in fluids that exhibit odd viscosity – a specific component of the viscous stress tensor found in e.g. chiral active fluids – is of particular interest for realising nontrivial particle transport and characterising out-of-equilibrium thermodynamic properties. Although three-dimensional odd viscosity has not yet been experimentally observed, charge stabilisation is expected to be vital in enabling such measurements. Therefore, we introduce the notion of a charged chiral active fluid and we investigate some of its non-trivial electrokinetic properties. In particular, we focus on electrophoresis of a charged sphere suspended in such an odd viscous fluid. Here, the peculiar nature of odd viscosity breaks the spherical symmetry of the system, and through coupling with the electric double layer and its screening properties, alters the electrophoretic mobility. Using the Lorentz reciprocal theorem, we derive expressions for the electrophoretic mobility of a spherical particle based on the analytical solution for the uncharged flow. Furthermore, we highlight how the Hückel and Smoluchowski limits of the electrophoretic mobility are affected by odd viscosity. Our results demonstrate that odd viscosity leads to directional asymmetries in the electrophoretic mobility tensor, suggesting mechanisms for active control of charged colloidal motion in systems where odd viscosity is prevalent.

Keywords: Odd viscosity; Electrophoretic mobility; Chiral active fluid; Electrolyte colloidal suspension