Preferred Label : electrokinetic potential;
Detailed label : electrokinetic potential, ζ;
IUPAC definition : Potential drop across the mobile part of the double layer, that is responsible for
electrokinetic phenomena. ζ is positive if the potential increases from the bulk of
the liquid phase towards the interface. In calculating the electrokinetic potential
from electrokinetic phenomena it is often asumed that the liquid adhering to the solid
wall and the mobile liquid are separated by a sharp shear plane. As long as there
is no reliable information on the values of the permittivity and the viscosity in
the electrical double layer close to the interface, the calculation of the electrokinetic
potential from electrokinetic experiments remains open to criticism. It is therefore
essential to indicate in all cases which equations have been used in the calculation
of ζ. It can be shown, however, that for the same assumptions about the permittivity
and viscosity all electrokinetic phenomena must give the same value for the electrokinetic
potential.;
Origin ID : E01968;
See also
Potential drop across the mobile part of the double layer, that is responsible for
electrokinetic phenomena. ζ is positive if the potential increases from the bulk of
the liquid phase towards the interface. In calculating the electrokinetic potential
from electrokinetic phenomena it is often asumed that the liquid adhering to the solid
wall and the mobile liquid are separated by a sharp shear plane. As long as there
is no reliable information on the values of the permittivity and the viscosity in
the electrical double layer close to the interface, the calculation of the electrokinetic
potential from electrokinetic experiments remains open to criticism. It is therefore
essential to indicate in all cases which equations have been used in the calculation
of ζ. It can be shown, however, that for the same assumptions about the permittivity
and viscosity all electrokinetic phenomena must give the same value for the electrokinetic
potential.