The dynamics of a topological change in a system of soap films

Authors Organisations
  • Stefan Hutzler(Author)
    Trinity College Dublin
  • M. Saadatfar(Author)
    Trinity College Dublin
  • Antje van der Net(Author)
    Trinity College Dublin
  • Denis Weaire(Author)
    Trinity College Dublin
  • Simon Cox(Author)
Type Article
Original languageEnglish
Pages (from-to)123-131
Number of pages9
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume323
Issue number1-3
Early online date15 Dec 2007
DOI
Publication statusPublished - 20 Jun 2008
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Abstract

The study of soap films spanning wire frames continues to provide insight into both static and dynamic properties of foams. Experiments show that sufficiently small triangular faces shrink spontaneously, with their area varying with time as t^0.8. The growth of the Plateau border that emerges after the collapse of the triangular face is initially linear, followed by an oscillatory relaxation to the equilibrium length. Its initial growth rate decreases with the viscosity of the liquid. We also consider wire frames in the shape of n-sided prisms with regular polygonal ends, n >= 3, and employ experiments and computer simulations to examine the stability of soap film configurations within them. Spontaneous shrinking of small faces occurs in 4 and 5-sided prismoidal frames, while this instability is suppressed for n >= 6.

Keywords

  • foams, emulsions and foams, surface-tension-driven instability