Conductivity of polyelectrolyte solutions

Conductance of Polyelectrolyte Solutions, Anisotropy, and Other Anomalies... 

The conductance of polyelectrolyte solutions can readily be measured with a high degree of precision [22], As a reference, the conductance behavior of simple electrolyte solutions is shown in Figure 1. Flere, A is equivalent conductance defined by... 

Vink H (2001) Conductance of polyelectrolyte solutions, anisotropy, and other anomalies. In Radeva T (ed) Conductance of polyelectrolyte solutions, anisotropy, and other anomaliesedn. Marcel Dekker, New York... 

Bordi, F., R. H. Colby, C. Cametti, L. De Lorenzo, and T. Gili (2002). Electrical conductivity of polyelectrolyte solutions in the semidilute and concentrated regime the role of counterion condensation. Journal of Physical Chemistry Part B 106(27) 6887-6893. 

The electrical conductivity of polyelectrolyte solutions has been extensively studied but it is a new area with a very short history. Only recently has it been possible to achieve electrical conductivity that is both accurate and reproducible because the electrical properties of a gel remain dependent upon the preparation methods. It is also due to the experimental difficulties encountered in electrolysis and the electrode polarization effect. 

Thus although it is possible formally to determine the limiting equivalent conductivity A0 of polyelectrolyte solutions, this quantity lacks the significance of the corresponding quantity in simple electrolyte solutions. Since we have according to Eqs. 1 and 27... 

For a complete characterization of conductance in polyelectrolyte solutions it is necessary to consider some odd features in their conductivity behavior. 

Irrespective of these models for ion binding, the two-state approach is inherent in the dynamic frictional treatment of conductivity in polyelectrolyte solutions, since strongly interacting counterions have to be classified as... 

Figure 1 shows the results obtained by Francois and Skoulios (27) on the conductivity of various liquid crystalline phases in the binary systems water-sodium lauryl sulfate and water-potassium laurate at 50 °C. As might be expected, the water-continuous normal hexagonal phase has the highest conductivity among the liquid crystals while the lamellar phase with its bimolecular leaflets of surfactant has the lowest conductivity. Francois (28) has presented data on the conductivity of the hexagonal phases of other soaps. She has also discussed the mechanism of ion transport in the hexagonal phase and its similarity to ion transport in aqueous solutions of rodlike polyelectrolytes. 

The basic equation for the equivalent conductivity of a pure polyelectrolyte solution is [118-122] ... 

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