Distribution of counterions near discretely charged planes and rods

Details Distribution of counterions near discretely charged planes and rods Distribution of counterions near discretely charged planes and rods

2003-10-22

arxiv.org/abs/cond-mat/0310540v3

Europhys. Lett. 66, 284 (2004)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 1 figure; added references, minor revisions

Scientific paper

10.1209/epl/i2003-10205-1

Realistic charged macromolecules are characterized by discrete (rather than homogeneous) charge distributions. We investigate the effects of surface charge discretization on the counterion distribution at the level of mean-field theory using a two-state model. Both planar and cylindrical geometries are considered; for the latter case, we compare our results to numerical solutions of the full Poisson-Boltzmann equation. We find that the discretization of the surface charge can cause enhanced localization of the counterions near the surface; for charged cylinders, counterion condensation can exceed Oosawa-Manning condensation.

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