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self-diffusion coefficient

The diffusion coefficient D i * of species i in the absence of a chemical potential gradient. It is related to the diffusion coefficient D i by
D i * = D i ∂ ( ln c i ) ∂ ln a i
where a i is the activity of i in the solution, and c i is the concentration of i. If an isotopically labelled species (i *) is used to study diffusion, the tracer diffusion coefficient, D i *, is practically identical to the self-diffusion coefficient provided that the isotope effect is sufficiently small.
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
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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. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.S05582.
Original PDF version: http://www.iupac.org/goldbook/S05582.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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