Line tension in a thick soap film

Line tension in a thick soap film
T Lenavetier, G Audéoud, M Berry, A Gauthier, R Poryles, C Trégouët, I Cantat

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.054001

Résumé :

The thickness of freshly made soap films is usually in the micron range, and interference colors make thickness fluctuations easily visible. Circular patterns of constant thickness are commonly observed, either a thin film disc in a thicker film or the reverse. In this Letter, we evidence the line tension at the origin of these circular patterns. Using a well controlled soap film preparation, we produce a piece of thin film surrounded by a thicker film. The thickness profile, measured with a spectral camera, leads to a line tension of the order of 10−10 N which drives the relaxation of the thin film shape, initially very elongated, toward a circular shape. A balance between line tension and air friction leads to a quantitative prediction of the relaxation process. Such a line tension is expected to play a role in the production of marginal regeneration patches, involved in soap film drainage and stability.


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