Abstract
The effect of hydrodynamic interactions on the free-solution electrophoresis ofpolyelectrolytes is investigated with coarse-grained molecular dynamics simulations. Bycomparing the results to simulations with switched-off hydrodynamic interactions, wedemonstrate their importance in modelling the experimentally observed behaviour. In orderto quantify the hydrodynamic interactions between the polyelectrolyte and thesolution, we present a novel way to estimate its effective charge. We obtain aneffective friction that is different from the hydrodynamic friction obtained fromdiffusion measurements. This effective friction is used to explain the constantelectrophoretic mobility for longer chains. To further emphasize the importanceof hydrodynamic interactions, we apply the model to end-labelled free-solutionelectrophoresis.
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