IUPAC definition of self-diffusion coefficient(This is measured using diaphragm-cell technique8 or the pulsed-gradient spin echo (PGSE) NMR method)

self-diffusion coefficient


According to IUPAC definition, self-diffusion coefficient is the diffusion coefficient of species i when the chemical potential gradient equals zero. It is linked to the diffusion coefficient Di by the equation:

Here, ai is the activity of the species i in the solution and ci is the concentration of i. This term is commonly assumed to be equal to the tracer diffusion determined by watching the movement of an isotope in the material of interest.

This is measured using diaphragm-cell technique8 or the pulsed-gradient spin echo (PGSE) NMR method


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