Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-04-20
J. Phys. Chem. B (Letters) 112 (2008) 7347
Physics
Condensed Matter
Soft Condensed Matter
letter (11 pages, 4 figures), accepted for publication in jpcb
Scientific paper
10.1021/jp800331b
We study salt-induced charge overcompensation and charge inversion of flexible polyelectrolytes via computer simulations and demonstrate the importance of ion excluded volume. Reentrant condensation takes place when the ion size is comparable to monomer size, and happens in a middle region of salt concentration. In a high-salt region, ions can overcharge a chain near its surface and charge distribution around a chain displays an oscillatory behavior. Unambiguous evidence obtained by electrophoresis shows that charge inversion does not necessarily appear with overcharging and occurs when the ion size is not big. These findings suggest a disconnection of resolubilization of polyelectrolyte condensates at high salt concentration with charge inversion.
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