Abstract
The natural buoyancy of gas bubbles has hampered conventional electrokinetic methods of evaluating charge at the gas-liquid interface.
In this study, bubbles are held by centripetal force at the centre of a horizontal, rotating cylinder filled completely with liquid. Migration of the bubble along the axis of the cylinder can be achieved by applying a gravity force or an electrophoretic force.
An expression for the drag coefficient has been developed and used to calculate surface charge densities and electrokinetic potentials. In the presence of potassium chloride, anionic and non-ionic surfactants, the electrokinetic potentials were negative (∼2–5 mV) at the air-aqueous interface. A cationic surfactant rendered the zeta potential positive.
A knowledge of the air-aqueous interfacial rheology is desirable if the drag coefficient, and consequently the zeta potential, at all types of gas-liquid interfaces is to be evaluated.
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McShea, J.A., Callaghan, I.C. Electrokinetic potentials at the gas-aqueous interface by spinning cylinder electrophoresis. Colloid & Polymer Sci 261, 757–766 (1983). https://doi.org/10.1007/BF01410950
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DOI: https://doi.org/10.1007/BF01410950