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|
Diffusion of a single semiflexible charged polymer
Physics Department, TU Munich - 85748 Garching, Germany
2 Center for Nanoscience, Physics Department, LMU Munich 80539 München, Germany
Accepted: 22 August 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.
PACS: 87.15.Vv – Diffusion / 66.10.-x – Diffusion and ionic conduction in liquids / 87.64.Tt – Confocal microscopy
© EDP Sciences, 2006
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