Abstract
The surface electrical properties of paraffin particles have been investigated by electrophoretic light scattering and ESA (using the ESA-8000 and the AcoustoSizer). Potentiometric titrations have also been performed. The results show that anomalous surface conductance (also known as Stern layer conductance) is unimportant in this system, despite the fact that the bare surface charge density is of the order of 1 C m −2 and about 90% of the counterions are residing in the Stern layer. The magnitude of the ζ-potential decreases monotonously with increasing ionic strength, and the good agreement between the ζ-potentials obtained with different electrokinetic techniques further supports the relative unimportance of anomalous surface conductance in this system. We have, however, observed that the magnitude of the ζ-potential does decrease with time, and this effect needs to be further investigated.
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