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Issue 10, 2009
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Link between surface elasticity and foam stability

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Abstract

We have measured the surface dilational elastic moduli of bubbles immersed in water and soap bubbles in air. The short time response was obtained by submitting the bubbles to a rapid expansion after which the surface tension evolution was monitored, using either image analysis or pressure measurements. It was possible with this method to measure directly the Gibbs elasticity. The longer time response was obtained by submitting the bubbles to low frequency oscillations. Experiments were performed with solutions of non-ionic surfactants, C12E6, C12G2, their 1:1 mixture, Pluronic F-68 and 127 and the surface elastic moduli were compared with the stability of foams made with these surfactants. The foams evolve with time, first by Ostwald ripening, controlled by the low frequency elasticity, and then by bubbles coalescence, controlled by the high frequency elasticity.

Graphical abstract: Link between surface elasticity and foam stability

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Article information


Submitted
15 Dec 2008
Accepted
05 Mar 2009
First published
08 Apr 2009

Soft Matter, 2009,5, 2063-2071
Article type
Paper

Link between surface elasticity and foam stability

D. Georgieva, A. Cagna and D. Langevin, Soft Matter, 2009, 5, 2063 DOI: 10.1039/B822568K

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