On the effect of small ions in the dynamics of polyelectrolyte solutions

Abstract
The effect of small ions on the dynamics of polyelectrolyte solutions complements a preceding publication (J. Physique Lett. 46 (1985) L-207). Expressions for the polyion mutual diffusion coefficient are given as a function of polyelectrolyte and added salt concentrations. For small point-like ions, the classical expressions derived for uncharged systems are deduced. A quantitative illustration of these effects is given : good agreement with light scattering measurements on protein solutions is obtained