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Updated: Aug 4, 2026

In Situ Characterization of Boehmite Particles in Water Using Liquid SEM
Published on: September 27, 2017
Surface potential at the hematite-water interface
1Laboratory of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Marulićev trg. 19, P.O. Box 163, 10 001 Zagreb, Croatia. nkallay@chem.pmf.hr
Abstract:
Construction of a metal oxide electrode enabling measurement of surface potential is described. The electrode was made using a hematite monocrystal, which avoids the problems arising from the possible porosity of the oxide layer. The potential of this electrode was measured as a function of pH. The hematite electrode provides reproducible results, especially in the acidic region. Surface potentials were calculated from electrode potentials using the electrokinetic isoelectric point. The slope of surface potential with respect to pH was found to be lower than the Nernstian, especially in the basic region. The effect was more pronounced at higher ionic strengths. It was shown how the measurement of surface potential can help to interpret the equilibrium data and evaluate the choice of a theoretical model describing the interfacial equilibrium at the metal oxide-water interface.
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