Evaluation methods for the zeta potential of solid surfaces
The measurement of the streaming potential is the classical approach towards the zeta potential of macroscopic solids. The streaminig current is an alternative parameter to assess the surface zeta potential. State-of-the-art instruments for surface zeta potential analysis provide the same quality of these measuring parameters. Their relation to the surface zeta potential, however, introduces preferences and restrictions for their applications.
The zeta potential is an important property of charged solid-liquid interfaces and an indicator for the actual surface charge of a solid in contact with an electrolyte solution. For macroscopic solid surfaces, the zeta potential is determined by the measurement of the streaming potential and alternatively of the streaming current. With SurPASS 3 both streaming potential and streaming current are measured with the same data quality. However, the evaluation of the surface zeta potential from streaming potential measurements may be affected by surface conductance of the sample, while the streaming current approach requires knowledge about the geometry of the flow channel. This report explains the fundamental equations for evaluating the surface zeta potential from streaming potential and streaming current measurements.
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