Impact dynamics of surfactant laden drops : dynamic surface tension effects

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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https://hal.archives-ouvertes.fr/hal-00471222
Contributor : Salima Rafaï <>
Submitted on : Wednesday, April 7, 2010 - 4:31:08 PM
Last modification on : Tuesday, May 14, 2019 - 10:25:51 AM

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Denis Bartolo, Mounir Aytouna, G.H. Wegdam, Daniel Bonn, Salima Rafaï. Impact dynamics of surfactant laden drops : dynamic surface tension effects. Experiments in Fluids, Springer Verlag (Germany), 2009, 48 (1), pp.49. ⟨10.1007/s00348-009-0703-9⟩. ⟨hal-00471222⟩

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