Time dependent scattering properties of slow decaying liquid foams

J. N. Swamy, C. Crofcheck, M. P. Mengüç

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


An experimental procedure is described to explore the physical characteristics of foam structures using a diagnostics tool based on elliptically polarized light scattering (EPLS) concept. The experimental system was constrained in cylindrical geometry and used to test a slow decaying, stable foam. Measurements were taken over a period of 30 h to utilize the scaling behavior of foam over long time scales. The normalized Mueller matrix elements were obtained for backscattering angles in the range of 120-150°. Additionally, Monte Carlo simulations were conducted and compared to the experiments. Experimental results suggest that backscattering signals, as quantified with the matrix elements (S11, S12, and S33), are sensitive to foam age and show a dynamic range especially at angles between 120° and 135°. The Monte Carlo simulations display a qualitative agreement with the angular profiles obtained from experiments. The age dependence of the properties of shaving foam in terms of the liquid fraction, bubble size, and polydispersity is used to understand the correlation with the measured profiles of S11, S12, and S33.

Original languageEnglish
Pages (from-to)80-86
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number1-3
StatePublished - Apr 15 2009


  • Foam
  • Monte Carlo method
  • Mueller matrix
  • Polarized light scattering

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


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