Effective interactions between like-charged macromolecules

Details Effective interactions between like-charged macromolecules Effective interactions between like-charged macromolecules

2000-06-05

arxiv.org/abs/cond-mat/0006069v1

Phys. Rev. E 62, R1465 (2000).

Physics

Condensed Matter

Soft Condensed Matter

No figure, accepted as a Rapid Communication in Physical Review E

Scientific paper

10.1103/PhysRevE.62.R1465

We investigate, within a local density functional theory formalism, the interactions between like-charged polyions immersed in a confined electrolyte. We obtain a simple condition for a repulsive effective pair potential, that can be related to the thermodynamic stability criterion of the uncharged counterpart of microscopic species constituting the electrolyte. Under the same condition, the phenomenon of charge inversion (over-charging), where the polyion bare charge is over-screened by its electric double layer, is shown to be impossible. These results hold beyond standard mean-field theories (such as Poisson-Boltzmann or Modified Poisson-Boltzmann approaches).

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