Etude des processus de concentration et de dispersion d'une suspension de micro-algues : effet des interactions hydrodynamiques sur la dynamique de la suspension

Abstract : The subject of this thesis is part of the study of the active matter. These systems are composed of "active particles" capable of organizing themselves spontaneously (phase transition), and autonomously (without application of an external field), thus creating complex dynamics such as dynamical phase transition, synchronization, instabilities etc ...Numerous studies tend to show the important role of interactions between active particles in the emergence of these dynamics. We have addressed these issues through the study of a suspension of microalgae Chlamydomonas reinhardtii. It is a model system of micro-swimmer commonly used for the study of active suspensions. We studied in particular a phenomenon of spontaneous migration of the suspension, allowing to concentrate micro-algae thanks to a light source. We then studied the dispersal process of a concentrated bloom of microalgae. In particular, we have highlighted the role of hydrodynamic interactions between micro-algae in this dispersion dynamics.
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Matthieu Martin. Etude des processus de concentration et de dispersion d'une suspension de micro-algues : effet des interactions hydrodynamiques sur la dynamique de la suspension. Biophysique [physics.bio-ph]. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAY008⟩. ⟨tel-01628205⟩

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