A New Method for Measuring Contact Angle and Liquid Surface Tension Applying Detachment of Two-Dimensional Meniscus
✍ Scribed by Kenji Katoh; Yu Tsao; Masayoshi Yamamoto; Tsuneo Azuma; Hideomi Fujita
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 201 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
The purpose of this study is to develop a simple method A method is proposed for measuring either the solid-liquid to measure contact angle and surface tension. In a previous contact angle or the liquid surface tension. The method applies report (11), we proposed a new method to measure the the geometrical instability of a liquid meniscus. When a circular contact angle, in which we applied the unstable phenomenon cylinder as a test solid is horizontally immersed into a liquid bath of an axisymmetric liquid meniscus attaching to the underand lifted up gradually, a pair of two-dimensional meniscuses is side of a test cone surface. At a certain critical height of the formed under the side wall. At a certain critical height of the cone, the meniscus spontaneously falls from the cone surface cylinder, the narrowest parts of the two meniscus curves contact because of energetic instability. Since there is a theoretical each other, and the meniscus breaks down. Since the relation relationship between the contact angle and the critical height, between the critical height H Ber and the contact angle u can be calculated theoretically, u can be obtained by a simple measure-the contact angle can be obtained by the measurement of ment of H Ber . It is possible to apply the same method for a plate the critical height. Although this method has the merit of used as a test solid. The liquid surface tension also can be measured allowing the contact angle to be easily measured, a cone by using a glass cylinder or plate to which most liquids attach at u surface is not general as a test solid surface. In this report, Å 0. The validity and usefulness of the method was experimentally a simpler method using a cylinder and plate as the test surconfirmed for various solid and liquid samples. ᭧ 1998 Academic Press faces is proposed to measure both contact angle and liquid Key Words: contact angle; surface tension; measuring method; surface tension. This method applies the geometric instabilliquid meniscus.
ity of the two-dimensional meniscus curve attaching to the solid test surface. Although the critical height is also measured by this method, the principle involved and the mea-1 To whom correspondence should be addressed.
the cylinder is lifted up slowly, the attaching point of the 54