Abstract
The stability of thin liquid films of vesicle suspensions in water formed on a quartz surface is studied by measuring the film lifetime τ and the kinetics of the three-phase contact line formed after the film rupture. The experiments were performed at two temperatures, 20 and 30°C, spanning the melting phase-transition temperature T c of the DMPC lipid used. At the upper temperature it is observed that τ exhibits a pronounced minimum as a function of the vesicle concentration, whereas the dynamic contact angle shows a maximum. To explain the experimental results, the existence of a specific hydrophobic attractive force between the film surfaces is required. Thus, a scenario for the film rupture is proposed that provides an explanation of the results above T c and of the unlimited stability of the films below T c.
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