Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: POSTERS Driven Soft Matter
CPP 20.7: Poster
Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A
Polymer drift in a solvent by force acting on one polymer end — •Semjon Stepanow1 and Norio Kikuchi2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany — 2Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560 012 India
We investigate the effect of hydrodynamic interactions on the non-equilibrium drift dynamics of an ideal flexible polymer pulled by a constant force applied at one polymer end using the perturbation theory and the renormalization group method. For moderate force, if the polymer elongation is small, the hydrodynamic interactions are not screened and the velocity and the longitudinal elongation of the polymer are computed using the renormalization group method. Both the velocity and elongation are nonlinear functions of the driving force in this regime. For large elongation we found two regimes. For large force but finite chain length L the hydrodynamic interactions are screened. For large chain lengths and a finite force the hydrodynamic interactions are only partially screened, which in three dimensions results in unusual logarithmic corrections to the velocity and the longitudinal elongation.