surface excess energy

Defined by:

$U σ = U − U α − U β = U − V α U m α V m α − V β U m β V m β$

where $V α$ and $V β$ satisfy the condition $V α + V β = V$ , the total volume of the system. ( $U m α V m α$ ) and ( $U m β V m β$ ) are the energy densities in the two bulk phases where $U m α$ and $U m β$ are the mean molar energies and $V m α$ and $V m β$ are the mean molar volumes of the two phases.

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 599

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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.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.S06173.

Original PDF version: http://www.iupac.org/goldbook/S06173.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 The PDF version is out of date and is provided for reference purposes only.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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