Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 65: Complex Fluids and Soft Matter (organized by DY)

CPP 65.4: Vortrag

Freitag, 24. März 2017, 10:30–10:45, HÜL 186

Microrheology of rod-shaped particles in free standing liquid crystal films of the smectic phase — •Christoph Klopp, Alexey Eremin, and Ralf Stannarius — Institute of Experimental Physics, Otto-von-Guericke University Magdeburg, Germany

Flow phenomena in restricted geometries have been studied in a variety of different physical, chemical and biological systems in the last years. These studies investigate the motion of proteins in lipid membranes and the motion of submicrometer-sized inclusions on thin membranes. Organic liquid crystal materials are able to form very thin, stable free standing films of highly uniform structure and thickness, making them ideal systems for studies of hydrodynamics in two dimensions. We study the mobility of sphere and rod-shaped inclusions in freely-suspended liquid crystal films of the smectic A phase [1]. For the rod-shaped particles we analyze the rotational and translational mobility by measuring Brownian motion. We compare our results with the existing theory of Saffman and Delbrück [2] and analyze the effect of particle anisometry. Measurable effects appear when the length of the particles is comparable to or larger than the hydrodynamic size of the system (Saffman length) and we are able to confirm the theory of Levine et al. with our data [3].

[1] A. Eremin et al., 2011. Pys. Rev. Lett. 107, 268301.

[2] Z. H. Nguyen et al., 2010. Pys. Rev. Lett. 105, 268304.

[3] A. J. Levine et al., 2004. Phys. Rev. Lett. 93, 038102.