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According to the 2nd edition of the IUPAC Compendium of Chemical Terminology (1997), self-diffusion coefficient is the diffusion coefficient D_i^* of species i when the chemical potential gradient equals zero. It is linked to the diffusion coefficient Di by the equation:

D_i^*=D_i\frac{\partial\ln c_i}{\partial\ln a_i}.

Here, ai is the activity of the species i in the solution and ci is the concentration of i.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Self-diffusion". A list of authors is available in Wikipedia.
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