laboratoire de physique statistique
 
 
laboratoire de physique statistique

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EXPERIMENTS IN FLUIDS 


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P U B L I C A T I O N S



 
2010
Impact dynamics of surfactant laden drops: dynamic surface tension effects - Aytouna, Mounir and Bartolo, Denis and Wegdam, Gerard and Bonn, Daniel and Rafai, Salima
EXPERIMENTS IN FLUIDS 4849-57 (2010)

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.