Monday, December 11th, 11h30, Room 454 A, Condorcet Building.

Laurence Talini

Surface du verre et interfaces – UMR125

CNRS, Saint-Gobain

Foaming in binary mixtures

The lifetime of bubbles in a binary mixture can be considerably longer, sometimes by several orders of magnitude, than that of a pure liquid of similar viscosity. This phenomenon is observed even in the absence of evaporation or liquid contamination. It was first demonstrated several decades ago [1], but has only recently been explained [2, 3]. It is due to slight differences in the bulk and surface concentrations of the components, which impart surface elasticity to a thin film of mixture. Since their simple surface rheology is the sole cause of bubble lifetime extension in binary mixtures, they are in fact model systems for the study of liquid film rupture mechanisms. We show that rupture processes can be quantitatively described in binary mixtures. These results pave the way for a better understanding of liquid film rupture in more complex systems.

[1] S. Ross and G. Nishioka, J. Phys. Chem. 79, 1561 (1975).
[2] H.-P. Tran et al. Phys. Rev. Lett. 125, 178002 (2020).
[3] H.-P. Tran et al. J. Fluid Mech. 944, A55 (2022).

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