Attractive Interactions Between Rod-like Polyelectrolytes: Polarization, Crystallization, and Packing

Details Attractive Interactions Between Rod-like Polyelectrolytes: Polarization, Crystallization, and Packing Attractive Interactions Between Rod-like Polyelectrolytes: Polarization, Crystallization, and Packing

1999-01-28

arxiv.org/abs/cond-mat/9901337v2

Physics

Condensed Matter

Soft Condensed Matter

4 figures, uses revtex, psfig and epsf. The new version contains a different introduction, and the bibliography has been expan

Scientific paper

10.1103/PhysRevE.60.4496

We study the attractive interactions between rod-like charged polymers in solution that appear in the presence of multi-valence counterions. The counterions condensed to the rods exhibit both a strong transversal polarization and a longitudinal crystalline arrangement. At short distances between the rods, the fraction of condensed counterions increases, and the majority of these occupy the region between the rods, where they minimize their repulsive interactions by arranging themselves into packing structures. The attractive interaction is strongest for multivalent counterions. Our model takes into account the hard-core volume of the condensed counterions and their angular distribution around the rods. The hard core constraint strongly suppresses longitudinal charge fluctuations.

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