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AKB: Biologische Physik

AKB 50: Poster Session "Biological Physics"

AKB 50.84: Poster

Freitag, 12. März 2004, 10:30–13:00, B

Effective pair–potential approach to entangled stiff polymers — •Sven van Teeffelen, Erwin Frey, and Klaus Kroy — Hahn-Meitner Institut, Berlin

The entanglement of stiff polymers in solution is remarkably well described by an effective tube model, in complete analogy to the well–known blob model for flexible polymers. We extend the scope of this (so far homogeneous) model to account for spatial density fluctuations by reformulating it in terms of a microscopically motivated effective pair potential. This allows us to straightforwardly include additional interactions (depletion, van der Waals, electrostatic…), and thus turns the model into a versatile tool for predicting the static structure factor and the equilibrium phase behavior of stiff polymer solutions. Non–equilibrium (kinetic arrest) scenarios are also considered. Finally we discuss applications to biopolymer solutions.