Impact dynamics of surfactant laden drops: dynamic surface tension effects |
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Authors: | Mounir Aytouna Denis Bartolo Gerard Wegdam Daniel Bonn Salima Rafaï |
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Affiliation: | 1. Van der Waals-Zeeman Institute, Amsterdam, The Netherlands 3. Physique et mécanique des milieux hétérogènes, PMMH-ESPCI-CNRS UMR7636-P6-P7, Paris, France 2. Laboratoire de Physique Statistique de l’ENS, LPS-ENS-CNRS UMR8550-P6-P7, Paris, France 4. Laboratoire de Spectrométrie Physique, UJF-CNRS UMR5588, Grenoble, France
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Abstract: | We study the impact and subsequent retraction of aqueous surfactant-laden drops upon high-speed impact on hydrophobic surfaces. Without surfactants, a rapid expansion of the drop due to the fluid inertia is followed by a rapid retraction, due to the wetting incompatibility. With surfactants, the retraction can be partly or completely inhibited. We provide quantitative measurements showing that both the expansion and the retraction dynamics depend not only on the equilibrium surface tension (ST) but also on the dynamic tension of the surfactant solutions; the latter varies significantly between different surfactants. |
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