Salt-Induced Counterion-Mobility Anomaly in Polyelectrolyte Electrophoresis

Details Salt-Induced Counterion-Mobility Anomaly in Polyelectrolyte Electrophoresis Salt-Induced Counterion-Mobility Anomaly in Polyelectrolyte Electrophoresis

2009-05-23

arxiv.org/abs/0905.3853v1

Phys. Rev. Lett. 101, 176103 (2008)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.176103

We study the electrokinetics of a single polyelectrolyte chain in salt solution using hydrodynamic simulations. The salt-dependent chain mobility compares well with experimental DNA data. The mobility of condensed counterions exhibits a salt-dependent change of sign, an anomaly that is also reflected in the counterion excess conductivity. Using Green's function techniques this anomaly is explained by electrostatic screening of the hydrodynamic interactions between chain and counterions.

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