The effect of counter-ion substitution on the transport properties of polyelectrolyte solutions

✍ Scribed by H. Magdelénat; P. Turr; P. Tivant; M. Chemla; R. Menez; M. Drifford

• Publisher: Wiley (John Wiley & Sons)
• Year: 1979
• Tongue: English
• Weight: 782 KB
• Volume: 18
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1979.360180114

✦ Synopsis

The effects of counter-ion substitution in aqueous polyelectrolyte solutions (chondroitin sulfate) on the two main transport phenomena of the ionic species, self-diffusion and electrical mobility, were studied experimentally by tracer methods and dynamic light scattering. The data were analyzed with respect to counter-ion Condensation and stoichiometric substitution of low-ionic counterions by high-ionic charge ones and compared to Manning's theory. Substitution effects on the apparent charge of the macro-ion were derived from the transport data using an extended Nernst-Einstein relationship and discussed in the light of the condensation effect in polyelectrolyte solutions. The effective charge of the polyion (i.e., its residual charge after condensation of counter-ions) and the charge difference between the substituting counter-ions appear determinant in the mechanism of substitution.