Münster 1997 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
PO: Polymerphysik
PO 3: Poster: Kolloide und Polyelektrolyte
PO 3.12: Poster
Monday, March 17, 1997, 15:30–17:30, Gg
Persistence length of weakly charged polyelectrolytes with variable intrinsic stiffness — •Uwe Micka and Kurt Kremer — Max-Planck-Institut für Polymerforschung, Postfach 3184, 55021 Mainz
We present simulations of a basic model of weakly charged polyelectrolyte chains of variable intrinsic stiffness within the Debye-Hückel approximation. Starting from the sublinear dependence of the electrostatic persistence length Le on the screening parameter for flexible systems [1], the corresponding effective exponent y crosses over to values up to 2 when the intrinsic persistence length L0 exceeds the electrostatic one Le. LP shows a pronounced minimum with increasing intrinsic stiffness due to the occurence of two relevant length scales which influence each other strongly [2,3]. This makes the concept of a unique persistence length for these systems questionable.
[1] U. Micka & K. Kremer, Phys. Rev. E 54 (3), 2653 (1996)
[2] U. Micka & K. Kremer, EPL (1996) submitted
[3] U. Micka & K. Kremer, J. Phys.: Cond. Matter 8 (47), 9463 (1996)