Activity-based Diffusion Coefficients for Liquid Solutions


WHETHER an equilibrium concept is applied to a consideration for diffusion in liquids or whether the methods of irreversible thermodynamics1,2 are used, it is clearly established that the driving force for molecular diffusion in liquids, such as occurs in the well-known diaphragm cell, is the gradient of the chemical potential. However, it has been the common practice to report diffusion coefficients calculated on the basis of concentration gradients as the driving force rather than the gradients of the chemical potential.

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DULLIEN, F., SHEMILT, L. Activity-based Diffusion Coefficients for Liquid Solutions. Nature 190, 526–528 (1961).

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