Definitions and preferred symbols for mass diffusion coefficients in multicomponent fluid mixtures including electrolytes (IUPAC technical report)

Klein T, Kankanamge CJ, Koller TM, Rausch MH, Fröba AP, Assael MJ, Wakeham WA, Guevara-Carrion G, Vrabec J (2025)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2025

Journal

Book Volume: 97

Pages Range: 689-713

Journal Issue: 7

DOI: 10.1515/pac-2024-0251

Abstract

This work summarizes the fundamentals of the description of molecular diffusion in liquid and gaseous non-electrolyte and electrolyte systems at constant temperature and pressure and in the absence of external fields. On the basis of Fick's law and the theory of Maxwell and Stefan, the description of diffusive fluxes in commonly used reference frames and a recommendation for the terminology of the associated diffusion coefficients are given. For non-electrolyte systems, the corresponding equations for the diffusive fluxes are outlined for a general n-component mixture and are explicitly stated for binary and ternary mixtures. Additionally, the transformation of the component order is discussed for a general n-component mixture. For electrolyte mixtures, explicit equations for the diffusive fluxes are stated for binary mixtures consisting of a molecular solvent and a dissolved electrolyte component and binary mixtures consisting of two electrolyte components sharing a common ion. Furthermore, explicit equations for the diffusive fluxes are given for ternary systems consisting of one electrolyte component dissolved in two non-electrolyte solvents. For all the aforementioned systems, transformations of the diffusion coefficients between commonly used reference frames are included.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

Aristotle University of Thessaloniki Greece (GR) University of Southampton United Kingdom (GB) Technische Universität Berlin Germany (DE)

How to cite

APA:

Klein, T., Kankanamge, C.J., Koller, T.M., Rausch, M.H., Fröba, A.P., Assael, M.J.,... Vrabec, J. (2025). Definitions and preferred symbols for mass diffusion coefficients in multicomponent fluid mixtures including electrolytes (IUPAC technical report). Pure and Applied Chemistry, 97(7), 689-713. https://doi.org/10.1515/pac-2024-0251

MLA:

Klein, Tobias, et al. "Definitions and preferred symbols for mass diffusion coefficients in multicomponent fluid mixtures including electrolytes (IUPAC technical report)." Pure and Applied Chemistry 97.7 (2025): 689-713.

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