Self-diffusion

According to IUPAC definition, [ [http://goldbook.iupac.org/S05582.html IUPAC Compendium of Chemical Terminology, 2nd edition] ] 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:

$D\_i^*=D\_ifrac\{partialln\; c\_i\}\{partialln\; a\_i\}.$

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

See also

* Diffusion

References