engleski

Introduction of surface potential measurements in interpretation of equilibrium at electrical interfacial layer

Electrostatic potential at the inner surface plane within the electrical interfacial layer (surface potential Ψ0) affects the state of charged surface species formed by interactions with potential determining ions (p.d.i.) and is one of the main parameters characterizing the interface. Surface potential (Ψ0) could be measured by Ion Sensitive Field Effect Transistors (ISFET) and by more recently developed Single Crystal Electrodes (SCrE). Surface potential measurements by themselves, and also in combination with electrokinetic and surface charge data, provide information on the rate of equilibration and the equilibrium state. The properties of individual surface planes, as well as their interaction due to the bulk crystal conductivity could be examined and compared with the theoretical models. Several aqueous systems were examined, such as gas, ice, metal oxides and silver halides.

surface potential; electrical interfacial layer; surface charge; surface compexation

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