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I. Transition regions, line tensions and contact angles in soap films

✍ Scribed by J.A. De Feijter; A. Vrij

Publisher
Elsevier Science
Year
1972
Weight
778 KB
Volume
37
Category
Article
ISSN
0022-0728

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✦ Synopsis

An analysis is given of the thickness profile of a circular soap film and its Plateau border. It shows that in principle the thickness as a function of the radial distance, h(r), for a single film, can provide details of the interaction free energy AF(h) over a large range of h. The transition region between film and Plateau border where h(r) rapidly changes from microscopic to macroscopic values contains most information. With a simple model of AF(h), the profile and extension of the transition region is calculated for some "first black" soap films.

It is shown that to complete the macroscopic description of a liquid sheet, a line tension must be introduced. A theoretical expression for this line tension is given and its physical meaning is discussed. Some values are calculated using the same AF(h) as before.

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