Self-assembly of spherical interpolyelectrolyte complexes from oppositely charged polymers

Details Self-assembly of spherical interpolyelectrolyte complexes from oppositely charged polymers Self-assembly of spherical interpolyelectrolyte complexes from oppositely charged polymers

2012-04-25

arxiv.org/abs/1204.5665v1

Physics

Condensed Matter

Soft Condensed Matter

Soft Matter, in press 2012

Scientific paper

10.1039/C2SM25423A

The formation of inter-polyelectrolyte complexes from the association of oppositely charged polymers in an electrolyte is studied. The charged polymers are linear oppositely charged polyelectrolytes, with possibly a neutral block. This leads to complexes with a charged core, and a more dilute corona of dangling chains, or of loops (flower-like structure). The equilibrium aggregation number of the complexes (number of polycations m+ and polyanions m-) is determined by minimizing the relevant free energy functional, the Coulombic contribution of which is worked out within Poisson-Boltzmann theory. The complexes can be viewed as colloids that are permeable to micro-ionic species, including salt. We find that the complexation process can be highly specific, giving rise to very localized size distribution in composition space (m+,m-).

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