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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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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.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 The PDF version is out of date and is provided for reference purposes only.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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