Orientationally ordered aggregates of stiff polyelectrolytes in the presence of multivalent salt

Details Orientationally ordered aggregates of stiff polyelectrolytes in the presence of multivalent salt Orientationally ordered aggregates of stiff polyelectrolytes in the presence of multivalent salt

2009-01-13

arxiv.org/abs/0901.1740v2

Physics

Condensed Matter

Soft Condensed Matter

18 pages, 8 figures, accepted for publication in Soft Matter

Scientific paper

10.1039/b815953j

Aggregation of stiff polyelectrolytes in solution and angle- and distance-dependent potential of mean force between two like-charged rods are studied in the presence of 3-valent salt using molecular dynamics simulations. In the bulk solution, formation of long-lived metastable structures with similarities to the raft-like structures of actin filaments is observed within a range of salt concentration. The system finally goes to a state with lower free energy in which finite-sized bundles of parallel polyelectrolytes form. Preferred angle and interaction type between two like-charged rods at different separations and salt concentrations are also studied, which shed some light on the formation of orientationally ordered structures.

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