Surface rheology using microfluidic-based antibubbles


Abstract : Although the concepts of surface viscosity and elasticity date back to the Belgian scientist Plateau in the 19th century, they have only later been formalized mathematically and subsequently been used in quantitative descriptions of surface flows. The concepts of surface viscosity and elasticity (Marangoni) effects are intimately related, and are not always distinguishable in an experimental setting. One such setting is the antibubble. An antibubble is a spherical air film that is immersed in a surfactant mixture and drains under the action of hydrostatic pressure. A recent model developed by the promoter allows rationalizing the experimental data based on the sole effect of surface rheology. The project will thus consist in designing a microfluidic chip allowing generating antibubbles of calibrated diameter, from micron to few hundreds of micron size. This microfluidic chip will thus act as a surface rheometer, determining the surface viscoelasticity of a fluid/fluid interface from mean lifetime measurement of antibubbles. Since lifetimes obey to an exponential distribution, there is a need to generate a large number of antibubbles in order to obtain statistically reliable mean lifetimes. With this technique, it is expected to extend the sensitivity of existing devices available in the field of surface rheometry.
Promoteur/Supervisor : Prof. Scheid Benoit
Email : bscheid@ulb.ac.be
Site Web/Web site : http://www.tips-ulb.be
Centre de recherche/Research center : TIPs
Faculté/Faculty : Faculté des Sciences appliquées - école polytechnique/Brussels School of Engineering (Faculty of Applied Sciences)
Ecole doctorale/Graduate Colleges : Sciences de l'ingénieur/Engineering
Ecole doctorale thématique/Graduate School (French Only): Phénomènes non-linéaires, systèmes complexes et mécanique statistique



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