Behavior of polyelectrolyte solutions in a wide range of solvent dielectric constant |
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Authors: | Sergey K. Filippov,Thomas A.P. Seery,Peter ?ernoch,Ji?í Pá nek,Petr &Scaron těpá nek |
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Affiliation: | aInstitute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic;bDepartment of Chemistry, University of Connecticut, Storrs, CT 06269, United States;cPolymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, United States |
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Abstract: | We exploit the strong temperature dependence of dielectric constant of N-methylformamide to control the strength of electrostatic interactions in polyelectrolyte solutions of sodium polystyrene sulfonate, and investigate the dynamic properties of salt-free solutions over a broad temperature range, from 54 to −58 °C. The traditional fast and slow diffusion processes are observed. The ratio of diffusion coefficients, Ds/Df, increases and the ratio of their amplitudes, As/Af, decreases, both by a factor of about two in this temperature range confirming the expected temperature variation with the Bjerrum length. |
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Keywords: | Polyelectrolyte Sodium polystyrene sulfonate NMF (N-methylfomamide) DLS (dynamic light scattering) Extraordinary Slow mode |
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