Preferred Label : self-diffusion coefficient;
IUPAC definition : The diffusion coefficient Di* of species i in the absence of a chemical potential
gradient. It is related to the diffusion coefficient Di by \[D_{i} {*} D_{i}\ \frac{
(\ln c_{i})}{ \ln a_{i}}\] where ai is the activity of i in the solution, and ci
is the concentration of i. If an isotopically labelled species (i*) is used to study
diffusion, the tracer diffusion coefficient, Di*, is practically identical to the
self-diffusion coefficient provided that the isotope effect is sufficiently small.;
Origin ID : S05582;
See also
The diffusion coefficient Di* of species i in the absence of a chemical potential
gradient. It is related to the diffusion coefficient Di by \[D_{i} {*} D_{i}\ \frac{
(\ln c_{i})}{ \ln a_{i}}\] where ai is the activity of i in the solution, and ci
is the concentration of i. If an isotopically labelled species (i*) is used to study
diffusion, the tracer diffusion coefficient, Di*, is practically identical to the
self-diffusion coefficient provided that the isotope effect is sufficiently small.
