The
diffusion coefficient
of species
in the absence of a
chemical potentialgradient.
It is related to the
diffusion coefficient
by
where
is the activity of
in the solution,
and
is the concentration of
.
If an
isotopically labelled species
(
)
is used to study
diffusion, the
tracerdiffusion coefficient,
,
is practically identical to the self-
diffusion coefficient provided that the
isotope effect is sufficiently small.
Source:
PAC, 1972, 31, 577
(Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix
II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry)
on page 617
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
