Dielectric scaling in polyelectrolyte solutions with different solvent quality in the dilute concentration regime

In this note, we present a set of radiowave dielectric spectroscopy measurements of two dilute, differently-charged polyelectrolyte solutions, under different solvent conditions. We have found that both the dielectric strength, Delta epsilon, and the relaxation time, tau(ion), of the dielectric rela...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2006-08, Vol.8 (31), p.3653-3658
Main Authors: BORDI, F, CAMETTI, C, SENNATO, S, ZUZZI, S, DOU, S, COLBY, R. H
Format: Article
Language:English
Subjects:
Chemistry
Electric Conductivity
Electrochemistry
Electrolytes - chemistry
Exact sciences and technology
General and physical chemistry
Ions - chemistry
Polymers - chemistry
Solutions - chemistry
Solvents - chemistry
Spectrum Analysis
Thermodynamics
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Summary:In this note, we present a set of radiowave dielectric spectroscopy measurements of two dilute, differently-charged polyelectrolyte solutions, under different solvent conditions. We have found that both the dielectric strength, Delta epsilon, and the relaxation time, tau(ion), of the dielectric relaxation process associated with the counterion polarization along a length scale of the order of the correlation length obey the scaling laws with the polyion concentration, according to the Ito model. This is verified with good accuracy independently of the quality of the solvent, which has been varied from poor to good solvent conditions. This finding supports evidence to the fact that, in dilute solutions, the counterion polarization is independent of the polyion concentration, in spite of what occurs at the semi-dilute concentrations.
ISSN:1463-9076
1463-9084
DOI:10.1039/b605624e