The
surface excess amount or Gibbs adsorption of component
,
, which may be positive or negative, is defined as the excess of the amount of this
component actually present in the system over that present in a reference system of
the same volume as the real system and in which the bulk concentrations in the two
phases remain uniform up to the
Gibbs dividing surface. That is
where
is the total amount of the component
in the system,
and
are the concentrations in the two bulk phases
and
, and
and
are the volumes of the two phases defined by the
Gibbs surface.
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 588
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.
