Diffusion of a single semiflexible charged polymerX. Schlagberger1, J. Bayer2, J. O. Rädler2 and R. R. Netz1
1 Physics Department, TU Munich - 85748 Garching, Germany
2 Center for Nanoscience, Physics Department, LMU Munich 80539 München, Germany
received 19 June 2006; accepted in final form 22 August 2006
published online 13 September 2006
The diffusion of charged semiflexible polymers is studied by hydrodynamic simulations. The salt-dependent diffusion constant exhibits a shallow minimum at a screening length comparable to the polymer length. Fluorescence correlation spectroscopy data for ds-DNA fragments confirm the relative insensitivity of diffusion over a wide range of salt concentrations. A scaling expression for the diffusion constant of a neutral semiflexible chain encompassing the rod, the intermediate ideal and the asymptotic swollen regime is constructed.
87.15.Vv - Diffusion.
66.10.-x - Diffusion and ionic conduction in liquids.
87.64.Tt - Confocal microscopy.
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