engleski

Characterization of Solid/Liquid Interfaces by Surface Potential Measurements

Recently, the method for measurement of the surface potential Ψ 0 was introduced1. For that purpose the single crystal electrodes (SCrE) were developed2. The problem of evaluation of surface potentials from measured electrode potentials of SCrE was solved3. Surface potential, i.e. the electrostatic potential at the solid surface (inner Helmholtz plane), affects directly activity coefficients of charged surface species4 and thus the entire equilibrium within the electrical interfacial layer (EIL). Several metal oxide aqueous interfaces were examined. It was shown that the magnitude of the slope of the Ψ 0(pH) function is lower than the Nernstian, depending on the type of oxide and the composition of the electrolyte solution. The simultaneous interpretation of electrokinetic potential, surface potential and surface charge data will be presented. Such an approach enables more reliable characterization of interfaces. The application of results to the problem of stability of nano-dispersions will be discussed.

Surface potential; metal oxide; Electrical Interfacial Layer

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