Dresden 2006 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 45: Soft Matter
DY 45.5: Vortrag
Donnerstag, 30. März 2006, 15:30–15:45, SCH 251
Optimal cell approach to osmotic properties of finite stiff-chain polyelectrolytes — •Christian Holm1,2 and Dmytro Antypov3 — 1Frankfurt Institute for Advanced Studies (FIAS), Johann Wolfgang Goethe University, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — 2Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128, Mainz, Germany — 3Department of Materials Science and Metallurgy, Pembroke St., Cambridge, CB2 3QZ, UK
We propose a self-consistent geometry optimized cell model approach to study osmotic properties of stiff-chain polyelectrolyte solutions. In contrast to the usual monotonic Poisson-Boltzmann prediction, the osmotic coefficient is a non-monotonic function of concentration with a pronounced minimum. In the dilute regime, a lower degree of polymerization is found to reduce significantly the counterion condensation. Despite its simplicity, the single-chain cell model yields the same osmotic behavior as a corresponding many-body bulk system up to a dense semi-dilute regime.
[1] D. Antypov, C. Holm, manuscript submitted