Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: SKM Dissertation-Prize 2017

MA 8.3: Hauptvortrag

Montag, 20. März 2017, 11:20–11:45, HSZ 04

Dynamics of Thin Smectic Films: From Viscous Fluid to Quasi Elastic Behaviour — •Kirsten Harth — Otto von Guericke Universtät Magdeburg

Thin films and their dynamics are involved in numerous physical processes reaching from protein motion in cell membranes to surface coating with thin fluid layers. Smectic liquid crystals are partially ordered fluids, possessing a layered structure, in our case paired with in-plane viscous fluid properties. Free-standing smectic films are stable, they can span areas of several square centimetres at few nanometres thickness. We investigate the relaxation and rupture dynamics of sub-millimetre to centimetre sized free-floating and sessile smectic bubbles experimentally. An unpreceded crossover from surface tension driven, low-viscosity fluid type relaxation to behaviour reminiscent of vesicles and elastic membranes is observed. A novel model involving multi-fluid flow, and the in-plane and out-of-plane properties of the smectic film is developed to explain the experimental findings.