Abstract
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 salts. 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 a higher concentration of
multivalent salt.
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