Regensburg 2004 – wissenschaftliches Programm

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SYLS: Life Sciences on the Nanometer Scale - Physics Meets Biology

SYLS 3: Symposium "Life Sciences on the Nanometer Scale - Physics Meets Biology"

SYLS 3.39: Poster

Mittwoch, 10. März 2004, 16:00–18:30, B

Dynamics of Driven Polymers — •Xaver Schlagberger and Roland Netz — Department of Physics, LMU Munich

A semiflexible charged bead-spring chain in solution under the influence of an external field is investigated using Brownian Dynamics simulation. Counterions are explicitly added. Hydrodynamic interactions are included via an approximate mobility tensor (Rotne-Prager tensor). By choosing strong stretching and bending moduli we also cover stiff rodlike objects of the nanometer/micrometer scale. While, in low Reynolds number flow, highly symmetric rigid objects like cylinders and ellipsoids are not oriented in an homogeneous flow or by a homogeneous external force, a slight coupling between flexibility and hydrodynamic interactions leads to a torque the direction of which depends on the ratio between the stretching and bending moduli. Polarization effects compete with this mechanism. We extrapolate the results to experimentally accessible regions.