Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 26: Brownian Motion and Kinetic Theory II

DY 26.4: Vortrag

Dienstag, 28. März 2006, 17:00–17:15, H\"UL 186

Hydrodynamic coupling of rotation and translation between two colloidal particles — •T. Gisler, S. Martin, M. Reichert, and H. Stark — Universität Konstanz, Fachbereich Physik, Fach M621, 78457 Konstanz

We use optical tweezers combined with fast video microscopy to measure the coupling between translation and rotation of two colloidal spheres with diameters of 3−4 µm. Imaging the birefringent particles under crossed polarizers allows us to determine the positions and orientations of both particles simultaneously. Cross-correlations between random displacements of one particle and orientational fluctuations of its neighbor allow us to quantify the translation-rotation coupling induced by hydrodynamic interactions. Our results are in good agreement with the theory in the creeping-flow limit (M. Reichert and H. Stark, Phys. Rev. E 69, 031407 (2004)).