On the importance of hydrodynamic interactions in polyelectrolyte electrophoresis

Details On the importance of hydrodynamic interactions in polyelectrolyte electrophoresis On the importance of hydrodynamic interactions in polyelectrolyte electrophoresis

2008-08-19

arxiv.org/abs/0808.2606v1

Physics

Condensed Matter

Soft Condensed Matter

15 pages, 7 figures; accepted for publication in J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/20/49/494217

The effect of hydrodynamic interactions on the free-solution electrophoresis of polyelectrolytes is investigated with coarse-grained molecular dynamics simulations. By comparing the results to simulations with switched-off hydrodynamic interactions, we demonstrate their importance in modelling the experimentally observed behaviour. In order to quantify the hydrodynamic interactions between the polyelectrolyte and the solution, we present a novel way to estimate its effective charge. We obtain an effective friction that is different from the hydrodynamic friction obtained from diffusion measurements. This effective friction is used to explain the constant electrophoretic mobility for longer chains. To further emphasize the importance of hydrodynamic interactions, we apply the model to end-labeled free-solution electrophoresis.

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