Collapse of Stiff Polyelectrolytes due to Counterion Fluctuations

Details Collapse of Stiff Polyelectrolytes due to Counterion Fluctuations Collapse of Stiff Polyelectrolytes due to Counterion Fluctuations

1999-01-26

arxiv.org/abs/cond-mat/9901293v2

Phys. Rev. Lett. 82, 4456 (1999)

Physics

Condensed Matter

Soft Condensed Matter

4 pages RevTex, 3 ps figures included using epsf, final version as appeared in PRL

Scientific paper

10.1103/PhysRevLett.82.4456

The effective elasticity of highly charged stiff polyelectrolytes is studied in the presence of counterions, with and without added salt. The rigid polymer conformations may become unstable due to an effective attraction induced by counterion density fluctuations. Instabilities at the longest, or intermediate length scales may signal collapse to globule, or necklace states, respectively. In the presence of added-salt, a generalized electrostatic persistence length is obtained, which has a nontrivial dependence on the Debye screening length.

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