Abstract
A computational technique is described which enables interfacial tensions to be obtained readily from sessile drops by the measurement of the drop height, Z θ , maximum radius, X 90, and contact angle, θ. The method gives negligible errors when compared with the direct numerical solutions of the governing Laplace equations and is valid for any value of interfacial tension provided that the contact angle is greater than 90°. Optimization of experimental conditions is also discussed, and it is shown that errors are minimized by measurements on flat drops with contact angles greater than 150°.
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