Literaturnachweis - Detailanzeige
| Autor/inn/en | Della Volpe, C.; Siboni, S. |
|---|---|
| Titel | A "Conveyor Belt" Model for the Dynamic Contact Angle |
| Quelle | In: European Journal of Physics, 32 (2011) 4, S.1019-1032 (14 Seiten)
PDF als Volltext |
| Sprache | englisch |
| Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
| ISSN | 0143-0807 |
| DOI | 10.1088/0143-0807/32/4/015 |
| Schlagwörter | Mechanics (Physics); Equations (Mathematics); Science Instruction; Scientific Principles; Models; Science Experiments; Energy; Scientific Concepts |
| Abstract | 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.) (As Provided). |
| Anmerkungen | Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail: info@ioppubusa.com; Web site: http://www.iop.org/EJ/journal/EJP |
| Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
| Update | 2017/4/10 |
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