Self-diffusion

Self-diffusion
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Self-diffusion".

According to IUPAC definition,¹ 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 $D i$ by the equation:

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

Here, $a i$ is the activity of the species $i$ in the solution and $c i$ is the concentration of $i$ .

References

^ IUPAC Compendium of Chemical Terminology, 2nd edition

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