surface excess energy

https://doi.org/10.1351/goldbook.S06173
Defined by: Uσ=UUαUβ=UVα UmαVmαVβ UmβVmβ where Vα and Vβ satisfy the condition Vα+Vβ=V, the total volume of the system. (UmαVmα) and (UmβVmβ) are the energy densities in the two bulk phases where Umα and Umβ are the mean molar energies and Vmα and Vmβ 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 [Terms] [Paper]