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DY: Fachverband Dynamik und Statistische Physik

DY 24: Complex Fluids and Soft Matter (joint session DY/CPP)

DY 24.4: Vortrag

Dienstag, 17. März 2020, 10:15–10:30, ZEU 160

Dynamic wrinkling of thin liquid crystal films — •Dominik Mnich, Torsten Trittel, Kirsten Harth, Christoph Klopp, and Ralf Stannarius — Otto von Guericke University, Institute for Physics, 39106 Magdeburg, Germany

We demonstrate spontaneous wrinkling as a dynamical pattern in freely floating liquid-crystalline films. These films behave liquid-like with respect to flow within the film plane. The adjustment of the film shape to quick changes often requires the formation of additional layers. Centimeter-sized freely floating smectic bubbles are studied during the excitation with acoustic waves. We show that such films develop an undulation instability under acoustic excitation. The results of parabolic flight and ground lab experiments are presented. The observed "wrinkles" show charactistic wavelengths in the submillimeter range. We introduce a basic model of the wavelength selection mechanism.