Ian Wark Research Institute,
University of South Australia, Mawson Lakes SA 5095 Australia.
J. Colloid Interface Sci. 227, 152-163 (2000).
Abstract
Charge titration data for silver iodide,
titanium dioxide, aluminium oxide, silica dioxide, and ferric hydroxide
are analysed using a generic site binding model
that has the Nernst equation as a limiting form.
Both the hypernetted chain and the non-linear Poisson-Boltzmann
approximations are used to relate the diffuse double layer
potential to the surface charge, and a zeroth order Stern layer
is used to give the surface potential.
In all cases it is shown that
in the vicinity of the point of zero charge
the Nernst equation accurately gives the surface charge.
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