Coulombic interaction multicomponent systems

Addition of salt leads to an additional screening of the Coulomb interaction [28, 32]. Our calculations for a multicomponent (polymer counterions salt) and a two component system (polymer counterions) demonstrate that the correlation functions can very well be described using the De-bye-Hiickel potential with a salt concentration dependent screening length. The effective potentials, however, strongly depend on the salt concentration. The counterion-counterion potential is weaker, whereas the monomer-monomer potential is stronger. The latter is a consequence of salt ion condensation on the polymer chain. 

Anderko and Lencka find. Eng. Chem. Res. 37, 2878 (1998)] These authors present an analysis of self-diffusion in multicomponent aqueous electrolyte systems. Their model includes contributions of long-range (Coulombic) and short-range (hard-sphere) interactions. Their mixing rule was based on equations of nonequilibrium thermodynamics. The model accurately predicts self-diffusivities of ions and gases in aqueous solutions from dilute to about 30 mol/kg water. It makes it possible to take single-solute data and extend them to multicomponent mixtures. 

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