| Results of an extensive Monte Carlo study on both single and many semiflexible charged chains with excluded volume are summarized. The model employed has been tailored to mimic worm-like micelles in solution. Simulations have been performed at different ionic strengths of added salt, charge densities, chain lengths, and volume fractions Phi, covering the dilute to concentrated regime. At infinite dilution the scattering functions can be fitted by the same fitting functions for uncharged semiflexible chains with excluded volume, provided that an electrostatic contribution b_el is added to the bare Kuhn length. The scaling of b_el is found to be more complex than the Odijk-Skolnick-Fixman predictions, and qualitatively compatible with more recent variational calculations. Universality in the scaling of the radius of gyration is found if all lengths are rescaled by the total Kuhn length. At finite concentration, the simple model used is able to reproduce the structural peak in the scattering function S(q) observed in many experiments, as well as other properties of polyelectrolytes in solution. Universal behavior of the forward scattering S(0) is established after a rescaling of Phi. Monte Carlo data are found to be in very good agreement with experimental scattering measurements with equilibrium polyelectrolytes, which are giant worm-like micelles formed in mixtures of nonionic and ionic surfactants in dilute aqueous solution, with added salt.
for LaTeX users @article{LCannavacciuolo2002-14,
author = {L. Cannavacciuolo and J. S. Pedersen and P. Schurtenberger},
title = {Single coil properties and concentration effects for polyelectrolyte-like micelles: A Monte Carlo study},
journal = {J. Phys. Cond. Mat.},
volume = {14},
pages = {2283},
year = {2002}
}
\bibitem{LCannavacciuolo2002-14} L. Cannavacciuolo, J.S. Pedersen, P. Schurtenberger,
Single coil properties and concentration effects for polyelectrolyte-like micelles: A Monte Carlo study,
J. Phys. Cond. Mat. {\bf 14} (2002) 2283.LCannavacciuolo2002-14
L. Cannavacciuolo, J.S. Pedersen, P. Schurtenberger
Single coil properties and concentration effects for polyelectrolyte-like micelles: A Monte Carlo study
J. Phys. Cond. Mat.,14,2002,2283 |
mk@mat.ethz.ch
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