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ERIC Number: EJ931786
Record Type: Journal
Publication Date: 2011-Jul
Pages: 14
Abstractor: As Provided
Reference Count: 19
ISSN: ISSN-0143-0807
A "Conveyor Belt" Model for the Dynamic Contact Angle
Della Volpe, C.; Siboni, S.
European Journal of Physics, v32 n4 p1019-1032 Jul 2011
The familiar Young contact angle measurement of a liquid at equilibrium on a solid is a fundamental aspect of capillary phenomena. But in the real world it is not so easy to observe it. This is due to the roughness and/or heterogeneity of real surfaces, which typically are not perfectly planar and chemically homogeneous. What can be easily detected, and in a repeatable way, are advancing and receding contact angles. In this paper, we discuss a simple model which accounts for the onset of advancing and receding contact angles measured by the Wilhelmy microbalance, one of the most powerful techniques for contact angle measurements. The model also explains the experimental observation that advancing and receding contact angles become closer to each other when the system is gently "shaken", by supplying mechanical energy in an appropriate way. The model may be pedagogically useful in introducing students and teachers to aspects of capillary phenomena which are not usually discussed in basic physics courses. (Contains 10 figures.)
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A