Regensburg 2016 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 57: Focus Session: Turbulence - From Pattern Formation to Stochastic Disorder

DY 57.5: Talk

Thursday, March 10, 2016, 16:15–16:30, H46

Microrheology of sphere-shaped and anisometric rod-shaped objects in 2D fluids — Christoph Klopp, •Alexey Eremin, and Ralf Stannarius — Institute of Experimental Physics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39016 Magdeburg, Germany

Flow phenomena in restricted geometries have been intensively studied in the last years with implications to different physical, chemical and biological systems. Those studies usually employ indirect measurements of the inclusion mobilities for the lack of a convenient 2D model system. On the other hand, smectic liquid crystals form freely-suspended fluid films of highly uniform structure and thickness, making them ideal systems for studies of hydrodynamics in two dimensions. We study the mobility of sphere-shaped and rod-shaped inclusions in freely-suspended liquid crystal films. We demonstrate that in thin films, the mobility is primary determined by the coupling of the fluid to the surrounding air, as predicted by the Saffman-Delbrück theory. The effect of particle anisometry appears when the size of the particle is comparable to or larger than the hydrodynamic size of the system (Saffman length).

The authors acknowledge the support by DFG (STA 425-28)