Abstract
We study interbubble gas transfer in persistent foams resulting from relatively concentrated surfactant mixture solutions. The components of the surfactant mixtures have been carefully chosen to delay the breaking of the liquid films. The analysis of the phenomenon is performed as long as the liquid films are preserved from rupture.
Foams are obtained by independently fixing foaming solutions and gas flows through a coarse porous structure. Precise measurements of these flows give the initial gas volume fractions of the foams while real time diffractometry gives their bubble size initial distribution. The drainage of the foam films is also measured to know the mean variation of the film thickness versus time.
The relative decrease of the global bubble area induced by the gas transfer is determined from reflectometry measurements. We calculate this transfer on the basis of the Lemlich theory, taking into acciount the liquid drainage in the films. We show that a detailed comparison between theory and experiment allows to determine the surface resistances and the volume resistances of the liquid films to the gas transfer. For the studied foams it is found that the volume resistance is much higher than the surface resistance. We attribute the high values of this volume resistance to a long-range structure created in the films by the excess of ionic surfactant molecules. A prefiguration of this structure is detected in the foaming solutions by elastic light scattering.
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© 1996 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Marion, G., Benabdeljalil, K., Lachaise, J. (1996). Interbubble gas transfer in persistent foams resulting from surfactant mixtures. In: Solans, C., Infante, M.R., García-Celma, M.J. (eds) Trends in Colloid and Interface Science X. Progress in Colloid & Polymer Science, vol 100. Steinkopff. https://doi.org/10.1007/BFb0115769
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DOI: https://doi.org/10.1007/BFb0115769
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