The Measurement of Solid-Liquid Contact Angles

[+] Author and Article Information
Kenji Katoh

Department of Mechanical Engineering, Osaka City University, Osaka 558, Japan

Hideomi Fujita

Department of Mechanical Engineering, Nagoya University, Nagoya 464-01, Japan

Hideharu Sasaki

Ishikawajima System Technology Co., Ltd., Tokyo 102, Japan

Koichi Miyashita

Nihongaishi Co., Ltd., Nagoya 467, Japan

J. Fluids Eng 114(3), 460-463 (Sep 01, 1992) (4 pages) doi:10.1115/1.2910054 History: Received December 29, 1990; Online May 23, 2008


A new method is proposed for measuring solid-liquid contact angles. The well-known phenomenon where the liquid meniscus formed under a downward facing solid surface spontaneously breaks at a certain height is utilized in the contact angle measurements. The relation between the contact angle and the critical height of the solid surface where the instability occurs was derived theoretically from the solid-liquid wetting behavior using a thermodynamic approach. From the theoretical model the contact angles can be obtained by measuring the critical height of the solid. The validity of the analysis and the usefulness of the method were experimentally confirmed for various solid surfaces and test liquids.

Copyright © 1992 by The American Society of Mechanical Engineers
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