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Journal of Colloid and Interface Science 227, 152163 (2000) doi:10.1006/jcis.2000.6847, available online at http://www.idealibrary.com on
 

Summary: Journal of Colloid and Interface Science 227, 152­163 (2000)
doi:10.1006/jcis.2000.6847, available online at http://www.idealibrary.com on
Surface Charge of Silver Iodide and Several Metal Oxides. Are All
Surfaces Nernstian?
Ian Larson1
and Phil Attard2
Ian Wark Research Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
Received November 1, 1999; accepted March 15, 2000
Charge titration data for silver iodide, titanium dioxide, alu-
minum oxide, silica dioxide and ferric hydroxide are analyzed using
a generic site binding model that has the Nernst equation as a lim-
iting form. Both the hypernetted chain and the nonlinear 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. C 2000 Academic Press
Key Words: Nernst equation; charge titration; site binding; sur-
face potential.
INTRODUCTION

  

Source: Attard, Phil - School of Chemistry, University of Sydney

 

Collections: Chemistry