Europhys. Lett.
Volume 67, Number 1, July 2004
Page(s) 130 - 136
Section Interdisciplinary physics and related areas of science and technology
Published online 01 June 2004
Europhys. Lett., 67 (1) , pp. 130-136 (2004)
DOI: 10.1209/epl/i2003-10275-y

Attraction and unbinding of like-charged rods

A. 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 $\xi_{\ab{c}}=2/3$.

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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