On the importance of hydrodynamic interactions in polyelectrolyte electrophoresis
arXiv:0808.2606 · doi:10.1088/0953-8984/20/49/494217
Abstract
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.
15 pages, 7 figures; accepted for publication in J. Phys.: Condens. Matter
References in corpus (6)
- How to mesh up Ewald sums (I): A theoretical and numerical comparison of various particle mesh routines
- Simulation of a Single Polymer Chain in Solution by Combining Lattice Boltzmann and Molecular Dynamics
- The fraction of condensed counterions around a charged rod: Comparison of Poisson-Boltzmann theory and computer simulations
- Electrophoresis of colloidal dispersions in the low-salt regime
- Importance of hydrodynamic shielding for the dynamic behavior of short polyelectrolyte chains
- Colloidal electrophoresis: Scaling analysis, Green-Kubo relation, and numerical results