## Wikipedia - Auto-difusión (es) Wikipedia - Autodifusão (pt) Wikipedia - Özyayınım (tr) self-diffusion coefficient

https://doi.org/10.1351/goldbook.S05582
The @[email protected] $$D_{i}^{*}$$ of species $$i$$ in the absence of a @[email protected] @[email protected] It is related to the @[email protected] $$D_{i}$$ by $D_{i}^{*}=D_{i}\ \frac{\partial (\ln c_{i})}{\partial \ln a_{i}}$ where $$a_{i}$$ is the activity of $$i$$ in the solution, and $$c_{i}$$ is the concentration of $$i$$. If an @[email protected] species ($$i^{*}$$) is used to study @[email protected], the @[email protected] @[email protected], $$D_{i}^{*}$$, is practically identical to the [email protected]@ provided that the @[email protected] 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 [Terms] [Paper]