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Improved inverted bubble method for measuring small contact angles at crystal–solution–vapor interfaces

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Abstract

We propose and evaluate an improvement of the inverted bubble method, originally proposed by McLachlan and Cox [Rev. Sci. Instrum. 46, 80 (1975)], a technique for measuring small contact angles at crystal–solution–vapor interfaces on a gas bubble under a solid immersed in a test solution. A simple experimental setup is used to evaluate the proposed method. We conclude that the method is suitable for measuring small contact angles with a minimum detectable angle of about 3°. Improvements in instrument design are proposed to lower the detection limit to 0.5° or below.

© 2007 Optical Society of America

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