Nernst-Hartley equation

Replacement of the diffusion coefficients by the electrolytic mobilities according to Eq. (2.3.22) yields the Nernst-Hartley equation ... 

Therefore we expect Df, identified as the fast diffusion coefficient measured in dynamic light-scattering experiments, in infinitely dilute polyelectrolyte solutions to be very high at low salt concentrations and to decrease to self-diffusion coefficient D KRg 1) as the salt concentration is increased. The above result for KRg 1 limit is analogous to the Nernst-Hartley equation reported in Ref. 33. The theory described here accounts for stmctural correlations inside poly electrolyte chains. 

Since reactive absorption systems often contain electrolyte species, the calculation of relevant diffusion coefficients is crucial. The effective diffusion coefficients for electrolyte components can be obtained from the Nernst-Hartley equation (see... 

The progress in equilibrium correlation functions has also been used to extend the validity range of relations of irreversible thermodynamics to higher concentrations. An example is the Nernst-Hartley equation, Eq. (24), for completely dissociated electrolytes to yield the relationship... 

Fluctuations in ion density near a polyelectrolyte impose fluctuating electrostatic forces on the chain that can affect the chain s diffusion. As described by Sedl (207), polyelectrolyte diffusion in dilute solution is fast diffusion because coim-terions cause more rapid motion in a polyelectrolyte than would be noted in an equivalent neutral chain. Several investigators have modified equation 50 to include this Nernst-Hartley-type diffusion in a consistent manner (203,206). Tivant and co-workers suggested that in a monovalent electrolyte solution at large I the enhancement of Dm by polyelectrolyte-electrolyte coupling should be expressed as(208)... 

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