Attraction and unbinding of like-charged rodsA. Naji1, A. Arnold2, C. Holm2 and R. R. Netz1
1 Sektion Physik, LMU - Theresienstr. 37, D-80333 München, Germany
2 MPI für Polymerforschung - Ackermannweg 10, D-55128 Mainz, Germany
(Received 17 November 2003; accepted in final form 28 April 2004)
We investigate the effective interaction between two like-charged rods in the regime of large coupling parameters using both Molecular Dynamics simulation techniques and the recently introduced strong-coupling theory. We obtain attraction between the rods for elevated Manning parameters accompanied by an equilibrium surface-to-surface separation of the order of the Gouy-Chapman length. A continuous unbinding between the rods is predicted at a threshold Manning parameter .
87.15.-v - Biomolecules: structure and physical properties.
61.20.Ja - Computer simulation of liquid structure.
87.15.Nn - Properties of solutions; aggregation and crystallization of macromolecules.
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