Importance of Hydrodynamic Shielding for the Dynamic Behavior of Short Polyelectrolyte Chains

Kai Grass, Ute Böhme, Ulrich Scheler, Hervé Cottet, Christian Holm
2008 Physical Review Letters  
The dynamic behavior of polyelectrolyte chains in the oligomer range is investigated with coarse-grained molecular dynamics simulation and compared to data obtained by two different experimental methods, namely capillary electrophoresis and electrophoresis NMR. We find excellent agreement of experiments and simulations when hydrodynamic interactions are accounted for in the simulations. We show that the electrophoretic mobility exhibits a maximum in the oligomer range and for the first time
more » ... strate that this maximum is due to the hydrodynamical shielding between the chain monomers. Our findings demonstrate convincingly that it is possible to model dynamic behavior of polyelectrolytes using coarse grained models for both, the polyelectrolyte chains and the solvent induced hydrodynamic interactions.
doi:10.1103/physrevlett.100.096104 pmid:18352729 fatcat:7dcrzr5z2zhtpdwyo3sluuv5g4