Preferred Label : surface excess;
Detailed label : surface excess, nσ;
IUPAC definition : For an interface, the adsorption or surface excess of a given component is defined
as the difference between the amount of component actually present in the system,
and that which would be present (in a reference system) if the bulk concentration
in the adjoining phases were maintained up to a chosen geometrical dividing surface
(Gibbs dividing surface). For a solid/liquid interface in which no component of the
liquid phase penetrates into the solid, the surface excess (or adsorption) of component
i i /i is defined as: \[n_{i} {σ } n_{i}- V {{l}}\ c_{i} {{l}}\] where n i is the
total amount of i i /i in the system, V l is the volume of an arbitrarily chosen
amount of bulk liquid (in the framework of the so-called algebraic method) and cil
is its bulk concentration in the liquid.;
Origin ID : S06171;
See also
For an interface, the adsorption or surface excess of a given component is defined
as the difference between the amount of component actually present in the system,
and that which would be present (in a reference system) if the bulk concentration
in the adjoining phases were maintained up to a chosen geometrical dividing surface
(Gibbs dividing surface). For a solid/liquid interface in which no component of the
liquid phase penetrates into the solid, the surface excess (or adsorption) of component
i i /i is defined as: \[n_{i} {σ } n_{i}- V {{l}}\ c_{i} {{l}}\] where n i is the
total amount of i i /i in the system, V l is the volume of an arbitrarily chosen
amount of bulk liquid (in the framework of the so-called algebraic method) and cil
is its bulk concentration in the liquid.
