Like-Charge Colloid-Polyelectrolyte Complexation

Details Like-Charge Colloid-Polyelectrolyte Complexation Like-Charge Colloid-Polyelectrolyte Complexation

2002-01-28

arxiv.org/abs/cond-mat/0201515v1

J. Chem. Phys., vol 117 pp.2947-2960 (2002)

Physics

Condensed Matter

Soft Condensed Matter

18 pages, 13 (main) eps figures, RevTeX4, submitted to J. Chem. Phys

Scientific paper

10.1063/1.1490595

We investigate the complexation of a highly charged sphere with a long flexible polyelectrolyte, \textit{both negatively charged} in salt free environment. Electroneutrality is insured by the presence of divalent counterions. Using molecular dynamics (MD) within the framework of the primitive model, we consider different Coulomb coupling regimes. At strong Coulomb coupling we find that the adsorbed chain is always confined to the colloidal surface but forms different conformations that depend on the linear charge density of the chain. A mechanism involving the polyelectrolyte \textit{overcharging} is proposed to explain these structures. At intermediate Coulomb coupling, the chain conformation starts to become three-dimensional, and we observe multilayering of the highly charged chain while for lower charge density the chain wraps around the colloid. At weak Coulomb coupling, corresponding to an aqueous solvent, we still find like-charge complexation. In this latter case the chain conformation exhibits loops.

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