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Theses

Réarrangements et auto-organisation induits par une déformation dans une émulsion concentrée

Abstract : The concentrated emulsions are disordered compact packing of droplets of oil in water. As in the case of colloidal suspensions or foams, their rheological behavior is that of a Herschel-Bulkley liquid. On the microscopic scale, the flow is explained by plastic and localized rearrangements of the oil droplets. The objective of this thesis is to characterize and understand these microscopic dynamics. By adapting the Diffusing Wave Spectroscopy (DWS) technique, we have developed a time and space resolved detection technique for the plastic rearrangement of droplets . Concentrated, non-Brownian emulsions were developed by membrane emulsification. An osmotic device allows us to monitor in situ the confinement pressure of our samples. We have probed the rearrangements of droples triggered by applying to our samples uniaxial deformations of controlled amplitudes. We have observed the presence of plastic rearrangements even at the smallest amplitudes of deformations.
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Pierre-Yves Perrin. Réarrangements et auto-organisation induits par une déformation dans une émulsion concentrée. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066319⟩. ⟨tel-01724115⟩

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