Web Release Date: October 19,
Structure of Liquid Films of an Ordered Foam Confined in a Narrow Channel
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Groupe Matière Condensée et Matériaux, UMR CNRS 6626, Université de Rennes I, Campus de Beaulieu, 35042 Rennes Cedex, France, and Sciences Chimiques de Rennes, Ecole Nationale Supérieure de Chimie de Rennes, UMR 6226, Campus de Beaulieu, 35700 Rennes Cedex, France
Received June 13, 2007
In Final Form: September 6, 2007
Abstract:
A bamboo foam is the simplest case of an ordered foam confined in a narrow channel. It is made of a regular film distribution, arranged perpendicularly to the channel. Our work consists of studying the structural properties of several films taken in a drained foam. X-ray experiments highlighted the equality of the equilibrium thickness for each film within a foam. The same thickness was found as by measurements of disjoining pressure isotherms, proving as well that films of a bamboo foam behave like isolated ones. The refinement of X-ray data by a simple model of specular reflectivity showed a significant variation of the electronic distribution of the surfactant layer for a common black film forwarding from one equilibrium state to another. A discussion on the organization of the surfactant molecules to the gas/liquid interface and film is proposed.
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