Abstract
Surface tension measurements by the Wilhelmy plate method are being done at our laboratory using an automatic balance. Surface-active material (surfactant) is spread as a monolayer on an air-water interface and a Pt plate, suspended from a micro-balance, is brought vertically into contact with the interface. The water is contained in a trough, two opposite sides of which can move independently, one producing a large variation in surface area and the other generating a longitudinal wave in the monolayer. This set-up is a new, asymmetric variant of the Benjamins-De Feyter method. Results of measurements on visco-elastic interfacial properties of model compounds of lung surfactant are reported.
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