Charge relaxation in polyampholytes of various statistics |
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Authors: | S Moldakarimov A Johner JF Joanny |
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Institution: | (1) Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg Cedex, France, FR;(2) Laboratoire Européen Associé (LEA) ICS/MPIP(Mainz, Germany), DE;(3) Physicochimie Curie, Institut Curie Section Recherche, 26 rue d'Ulm, 75248 Paris, France, FR |
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Abstract: | We discuss theoretically the relaxation of charge fluctuations in polyampholyte solutions. It has been shown previously by
some of us (J. Wittmer et al. Europhys. Lett. 24, 263 (1993)) that the charge distribution along the polyampholyte backbone has a dramatic influence on the polarization energy
and hence on the solubility. Here it is demonstrated that a similar effect exists for the charge relaxation. The charge relaxation
mechanism qualitatively depends on the statistics: for alternating polyampholytes the relaxation is mainly due to local dipole
inversion and is not primarily driven by electrostatic interactions, whereas for random polyampholytes it is driven by electrostatic
interactions. Intermediate statistics (with short-ranged (exponential) correlations) appear as a combination of these two
limiting cases: short-wavelength modes are insensitive to the loss of correlations along the backbone, whereas long-wavelength
modes correspond to a random statistics with renormalized charges. The relaxation of the dielectric constant is also calculated.
Received: 20 December 2002 / Accepted: 13 March 2003 / Published online: 24 April 2003
RID="a"
ID="a"e-mail: johner@ics.u-strasbg.fr |
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Keywords: | PACS 61 25 Hq Macromolecular and polymer solutions polymer melts swelling |
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