Effect of Mono- and Multivalent Salts on Angle-dependent Attractions between Charged Rods

Details Effect of Mono- and Multivalent Salts on Angle-dependent Attractions between Charged Rods Effect of Mono- and Multivalent Salts on Angle-dependent Attractions between Charged Rods

2003-11-19

arxiv.org/abs/cond-mat/0311429v1

Phys. Rev. Lett. 93, 128101 (2004)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.93.128101

Using molecular dynamics simulations we examine the effective interactions between two like-charged rods as a function of angle and separation. In particular, we determine how the competing electrostatic repulsions and multivalent-ion-induced attractions depend upon concentrations of simple and multivalent salt. We find that with increasing multivalent salt the stable configuration of two rods evolves from isolated rods to aggregated perpendicular rods to aggregated parallel rods; at sufficiently high concentration, additional multivalent salt reduces the attraction. Monovalent salt enhances the attraction near the onset of aggregation, and reduces it at higher concentration of multivalent salt.

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