Europhys. Lett.
Volume 76, Number 2, October 2006
Page(s) 346 - 352
Section Interdisciplinary physics and related areas of science and technology
Published online 13 September 2006
Europhys. Lett., 76 (2), pp. 346-352 (2006)
DOI: 10.1209/epl/i2006-10254-x

Diffusion of a single semiflexible charged polymer

X. 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 $394\un{bp}$ 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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