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Dynamical aspects of active colloids : from dilute to dense systems

Abstract : Collective motion are present at every scales and in very various biological systems. For example one can observe flocks of birds, schools of fishes, or swarms of insects. To be able to describe and understand these collective effects, it is necessary to have experimental abiotic model systems.In this PhD we present an experimental system made of Janus colloids of gold and platinum. When putted in an hydrogen peroxide bath, they set in motion, consuming fuel.This system is fully out of equilibirum because energy is consumed at the scale of individuals. It presents collective motion with the apparition of clusters, dynamical aggregates of active colloids.This PhD is structured around three parts :- the study of the kinetics and dynamics of the clusters- the achievement of sedimentation experiments- the study of the system in dense assemblies, forming an active colloidal glass
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Félix Ginot. Dynamical aspects of active colloids : from dilute to dense systems. Physics [physics]. Université de Lyon, 2016. English. ⟨NNT : 2016LYSE1213⟩. ⟨tel-01449573⟩

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