| Issue |
EPL
Volume 80, Number 6, December 2007
|
|
|---|---|---|
| Article Number | 67002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/80/67002 | |
| Published online | 05 November 2007 | |
The dielectric spectrum of flexible polyelectrolyte solutions
Department of Chemistry, National Taiwan University - Taipei 106, Taiwan and Department of Physics, and Center of Theoretical Physics, National Taiwan University - Taipei 106, Taiwan
Received:
25
September
2007
Accepted:
15
October
2007
The simplest version of the double-layer polarization theory for the flexible polyelectrolyte solution is formulated where the thin-double-layer limit is taken. The double-layer region of the polyelectrolyte contains the excess fluxes of charge and salt where the off-diagonal Onsager coefficient couples the charge- and the neutral-salt dynamics. The dynamic charge and the salt distributions are solved for the weakly charged polyelectrolyte. We calculate the free-energy storage and loss under the applied AC electric field to obtain the dielectric function, which depends on the chain configuration through the chain structure factor. A simple mean-field structure factor for the flexible chains is used to calculate the dielectric spectrum for the full range of the polyelectrolyte concentration.
PACS: 77.22.Gm – Dielectric loss and relaxation / 66.10.-x – Diffusion and ionic conduction in liquids / 82.35.Rs – Polyelectrolytes
© Europhysics Letters Association, 2007
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