Abstract
A method is proposed for measuring either the solid–liquid contact angle or the liquid surface tension. The method applies the geometrical instability of a liquid meniscus. When a circular cylinder as a test solid is horizontally immersed into a liquid bath and lifted up gradually, a pair of two-dimensional meniscuses is formed under the side wall. At a certain critical height of the cylinder, the narrowest parts of the two meniscus curves contact each other, and the meniscus breaks down. Since the relation between the critical heightHBerand the contact angle θ can be calculated theoretically, θ can be obtained by a simple measurement ofHBer. It is possible to apply the same method for a plate used as a test solid. The liquid surface tension also can be measured by using a glass cylinder or plate to which most liquids attach at θ = 0. The validity and usefulness of the method was experimentally confirmed for various solid and liquid samples.
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