Emulsions microfluidiques et rouleurs colloïdaux : effets collectifs en matière molle forcée hors-équilibre

Abstract : Emulsions, colloidal suspensions, polymer solutions, bacterial suspensions, ... The dynamical properties of these disperse systems rely on the interplay between the microscopic structure of the dispersed phase, and the flow of the continuous phase.This thesis is devoted to the collective dynamics of suspensions driven out-of-equilibrium. The driving can take place either at the macroscopic scale (advection, uniform strength, ...) or at the microscopic scale (self-propulsion).Our goal is to understand the large scale dynamics of the suspensions on the basis of the symmetries of the interactions between the particles.Our approach is experimental. It relies on microfluidic tools to perform quantitative model experiments. In the first part of the manuscript, I focus on the dynamics of suspensions of passive particles in rigidly confined thin liquid films. In particular, I present experimental and theoretical results on the propagation of linear density waves in advected emulsions. In the second part of the manuscript, I study the collective dynamics of bidimensional assemblies of self-propelled particles embedded in a fluid at rest at infinity. I present our experimental setup based on a new propulsion mechanism for the particles. It enables us to study and understand the emergence of collective motion on the basis of the interactions between the individuals. Finally, I investigate the propagation of non-linear excitations of these assemblies of self-propelled particles in heterogeneous media.
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Nicolas Desreumaux. Emulsions microfluidiques et rouleurs colloïdaux : effets collectifs en matière molle forcée hors-équilibre. Matière Molle [cond-mat.soft]. Université Pierre et Marie Curie - Paris VI, 2015. Français. ⟨NNT : 2015PA066071⟩. ⟨tel-01159549⟩

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