Work of adhesion of water to a Teflon surface and stability of the system Teflon-air bubble-water

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Abstract
Measurements of water drops beginning to slide down on a vertical Teflon plate and the detachment force of air bubbles of the same volume from the face surface of cylindrical Teflon segments (rods) of various diameters in water were made. Simultaneously, the radius of the contact plane between the air bubble and segment was measured at the moment of detachment, as well as the radius of the small air bubble contact plane which was left after disruption of the Teflon-large air bubble-water system. On the basis of the results obtained, the work of adhesion of water to a Teflon surface was determined using equations known from the literature as well as the equation derived in this paper. Agreement between the values of the work of adhesion calculated from these different equations was obtained. It was found that measurements of the air bubble detachment force from a solid surface may be useful for determination of the work of adhesion of a liquid to a solid surface, at least for a solid for which vapor adsorption may be neglected.

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