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BP: Fachverband Biologische Physik

BP 16: Poster Session I

BP 16.31: Poster

Dienstag, 27. März 2007, 17:00–19:30, Poster D

Polymers in external fields — •Christian Sendner and Roland Netz — TU Muenchen, Physik Department, 85748 Garching

The dynamical response of polymers to external fields at finite temperature is investigated. We explicitly take hydrodynamic interactions in the limit of zero Reynolds number into account. The response of grafted DNA chains to alternating electric fields is examined, addressing important parameters like the bending rigidity. Terminally attached ligands change the dynamics of that system leading to possible biosensing applications [1]. In another project we analyze the influence of a solid--liquid interface on stiff polymers, driven parallel to the surface. This leads to a preferred orientation of the rod with respect to the wall, and gives rise to an effective repulsion away from the surface. We give scaling results for this long ranged repulsion in the high temperature limit. This purely hydrodynamic effect could lead to desorption transitions for short polymer chains which could be important for applications in the field of DNA chips.

[1] C. Sendner, Y.W. Kim, U. Rant, K. Arinaga, M. Tornow, and R. R. Netz, Phys. Stat. Sol. (a) 203 (14), 3476-3491 (2006)