Naslov
Surface Potential at the Hematite - water Interface

Autori
Kallay, Nikola ; Dojnović, Zvonimir ; Čop, Ana

Izvornik
Journal of Colloid and Interface Science (0021-9797) 286 (2005); 610-614

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
surface potential; hematite electrode; hematite-water interface

Sažetak
Construction of a metal oxide electrode enabling measurements of surface potential is described. The electrode was made using the 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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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