title: Investigating the role of a poorly soluble surfactant in a thermally driven 2D microfoam.
abstract: Foam drainage dynamics is known to be strongly affected by the nature of the surfactants stabilising the liquid/gas interface. In the present work, we consider a 2D microfoam stabilized by both soluble (sodium dodecylsulfate) and poorly soluble (dodecanol) surfactants. The drainage dynamics is driven by a thermocapillary Marangoni stress at the liquid/gas interface [V. Miralles et al., Phys. Rev. Lett., 2014, 112, 238302] and the presence of dodecanol at the interface induces interface stress acting against the applied thermocapillary stress, which slows down the drainage dynamics. We define a damping parameter that we measure as a function of the geometrical characteristics of the foam. We compare it with predictions based on the interface rheological properties of the solution.
authors: MMN, Laboratoire Gulliver, CNRS, ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005 Paris, France. marie-caroline.jullien@espci.fr.
authors: Vincent
authors: V
authors: Miralles
authors: Laboratoire de Physique des Solides, UMR CNRS & Université Paris-Sud 8502, 91405 Orsay Cedex, France.
authors: Emmanuelle
authors: E
authors: Rio
authors: IPR, UMR CNRS 6251, Université de Rennes 1, 35000 Rennes, France.
authors: Isabelle
authors: I
authors: Cantat
authors: MMN, Laboratoire Gulliver, CNRS, ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005 Paris, France. marie-caroline.jullien@espci.fr.
authors: Marie-Caroline
authors: MC
authors: Jullien