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Dynamics and coarsening in three-dimensional foams

By D J Durian, D A Weitz and D J Pine

Abstract

Abstract. We show that diffusing-wave spectroscopy can be used as a non-invasive probe of the bulk properties of three-dimensional foams. A new picture accounting for the origin of the temporal fluctuations of multiply scattexd light is developed and corroborated with direct observations through a microscope. Our interpretation and measurements yield the growth law for the coarsening of foam bubbles and new insight into their dynamics. The kinetics of phase separation and coarsening are phenomena of long standing interest [l]. Soap froths are common and fascinating examples, thought to be useful models of grain growth [a]. Recent experiments have focused on two-dimensional systems, where the structure and coarsening are readily observable [3-61. By contrast, because of the problem of visualizing an opaque system, no analogous experiments have been performed on three-dimensional foams. Nevertheless, such foams are of great scientific interest and have many industrial and commercial applications [7]. In this paper, we present a novel interpretation of the origin of temporal fluctuations of multiply scattered light in foams and obtain new information about the structure

Year: 1990
DOI identifier: 10.1088/0953-8984/2/s/069
OAI identifier: oai:CiteSeerX.psu:10.1.1.205.3716
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