  In this paper, some equations are derived to describe the out-of-equilibrium
thermodynamics of colloidal suspensions. These results are obtained assuming
that the properties of the colloids essentially come from their surfaces which
are unusually high in comparison to their volume. The dispersion, in the form
of a variable, is introduced in such a way as to embody the various changes
which could affect those systems. Explicit relations are deduced for the free
enthalpy of dispersion which describe two separated phenomena: the
peptization/coalescence and the suspension of a colloidal phase.
