The Formal Theory of Diffusion, and Its Relation to Self-diffusion, Sedimentation Equilibrium, and Viscosity.

Self-diffusion and interdiffusion in complex-forming binary systems

“…To get 33 in terms of DA* and Dc*, it is necessary to eliminate 31 and 32 from eq 38 and from Da*/RT = 3a* = 8i(l ") + qz^A (39) Sucrose-Water System at 25°T he data of Irani and Adamson22 for this system show that over a wide range of concentration (iVw.Ds* + NsD-w*) alone is greater than Dsw, so that the thermodynamic factor in the unmodified Darken equation (eq 5) acts in the wrong direction. As first pointed out by Scatchard,23 however, the marked negative deviation from Raoult's law in this system can be accounted for quantitatively in dilute solutions if it is assumed that every sucrose molecule is combined with about five molecules of water and that the hydrated molecules form ideal solutions.…”

New relationship between viscosity and the diffusion coefficients based on Lamm's theory of diffusion

“…= 2qii/(ni + ni+),(7) or, C#ii is the friction coefficient between i and i per two moles of i, as claimed above. *91 2 is sometimes called "activity corrected " diffusion coefficient and it is related to the experimentally measured Fick diffusion coefficient 0 1 2 by the equation 9 1 2 = D12/(d In a/d In N where a is the activity of either constituent and N is the corresponding mole fraction.…”

Liquid diffusion of nonelectrolytes: Part II

“…From the engineering point of view, equations relating the self-diffusion coefficient to the mutual diffusion coefficient are most desirable. Only in few instances have such equations been proposed (Lamm, 1954;Van Geet and Adamson, 1965…”