Abstract
Measurements of the force of air bubble detachment from sulfur and graphite surfaces in water were made. Simultaneously, the grain-air bubble system was photographed at the moment of detachment to measure the instantaneous contact angle. The results obtained are discussed as the relationship between detachment force and contact angle for various contact plane radii and air bubble volumes. The measured detachment force values were compared with those calculated from the contact angles. The relationship between the detachment force and the interfacial free energies of the phases in contact was derived for the systems tested.
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