Elaboration par un procédé de précipitation de nanoparticules aux propriétés contrôlées : application à la magnétite

Abstract : The present work is focused on developing and modeling a precipitation process for the production of magnetite (Fe3O4) nanoparticles. The Massart chemical method is chosen to obtain the magnetite nanoparticles owing to its detailed study on the reaction parameters. A semi-batch reactor with a recirculation system is chosen to realize this precipitation process and rapid mixers (T mixer and Hartridge-Roughton mixers of different dimensions) are used to provide an intensive mixing of reagent fluids. Different operating parameters are tested to determine their influences on the precipitate quality. Many analytic techniques are employed to determine the properties of obtained nanoparticles. The results indicate that, without changing of chemical parameters, the quality of magnetite elementary nanoparticles and agglomerates depend sensibly on the type of microreactors utilized. In addition, the magnetite nanoparticles are considered to be a hopeful nanoadsorbent and the related tests are studied. Finally, the CFD technique is used to model the hydrodynamic behaviors of the rapid mixers
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Wei Li. Elaboration par un procédé de précipitation de nanoparticules aux propriétés contrôlées : application à la magnétite. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL024N⟩. ⟨tel-01748880⟩

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