2008/08/19 by Kai Grass, K Grass, Christian Holm +1 · 6 citations
Chemistry · Engineering · Physics and Astronomy · #Diffusion #Dynamics (music) #Electrophoresis #Electrostatics and Colloid Interactions #Fick's laws of diffusion #Hydrodynamic radius #Microfluidic and Capillary Electrophoresis Applications #Molecular dynamics #Nanopore and Nanochannel Transport Studies #Polyelectrolyte #cond-mat.soft
paper · pdf · doi:10.1088/0953-8984/20/49/494217
published in Journal of Physics Condensed Matter 20(49), 494217 (IOP Publishing) · 15 pages, 7 figures; accepted for publication in J. Phys.: Condens. Matter
arxiv created 2008/08/19 · openalex publication_date 2008/11/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.