Volume 68, Number 4, November 2004
|Page(s)||494 - 500|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||27 October 2004|
Interaction between macroions mediated by divalent rod-like ions
Faculty of Electrical Engineering, Tržaška 25, University of Ljubljana 1000 Ljubljana, Slovenia
2 University College for Health Care, Poljanska 26a, University of Ljubljana 1000 Ljubljana, Slovenia
3 Research Group “Lipid Membranes”, Friedrich-Schiller University Neugasse. 25, Jena 07743, Germany
Accepted: 28 September 2004
Attractive interactions between identical like-charged macroions in aqueous multivalent salt solution arise due to ion-ion correlations. The mean-field level Poisson-Boltzmann (PB) theory does not predict such behavior for point-like structureless ions. Various multivalent ions, such as certain DNA condensing agents or short stiff polyelectrolytes, do have an internal, often rod-like, structure. Applying PB theory to the generic case of divalent rod-like salt ions, we find attraction between like-charged macroions above a critical distance between the two individual charges of the rod-like ions. We calculate this distance analytically within linearized PB theory. Numerical results for the non-linear PB theory indicate strong enhancement of the tendency to mediate attractive interactions.
PACS: 41.20.Cv – Electrostatics; Poisson and Laplace equations, boundary-value problems / 87.68.+z – Biomaterials and biological interfaces
© EDP Sciences, 2004
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