The electrostatic persistence length of polymers beyond the OSF limit |
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Authors: | R. Everaers A. Milchev V. Yamakov |
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Affiliation: | (1) Max-Planck-Institut für Polymerforschung, Postfach 3148, D-55021 Mainz, Germany, DE;(2) Institute for Physical Chemistry, Bulgarian Academy of Sciences, G. Bonchev Street, Block 11, 1113 Sofia, Bulgaria, BG |
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Abstract: | We use large-scale Monte Carlo simulations to test scaling theories for the electrostatic persistence length l e of isolated, uniformly charged polymers with Debye-Hückel intrachain interactions in the limit where the screening length κ-1 exceeds the intrinsic persistence length of the chains. Our simulations cover a significantly larger part of the parameter space than previous studies. We observe no significant deviations from the prediction l e∝κ-2 by Khokhlov and Khachaturian which is based on applying the Odijk-Skolnick-Fixman theories of electrostatic bending rigidity and electrostatically excluded volume to the stretched de Gennes-Pincus-Velasco-Brochard polyelectrolyte blob chain. A linear or sublinear dependence of the persistence length on the screening length can be ruled out. We show that previous results pointing into this direction are due to a combination of excluded-volume and finite chain length effects. The paper emphasizes the role of scaling arguments in the development of useful representations for experimental and simulation data. Received 12 February 2002 |
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Keywords: | PACS. 64.60.-i General studies of phase transitions – 36.20.-r Macromolecules and polymer molecules – 87.15.By Structure and bonding |
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