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Mise en forme de nanocomposites par contrôle des interactions d'un métallogel fer-triazole avec la silice et étude des propriétés de transition de spin du matériau

Abstract : Iron-triazole coordination polymers have been extensively studied during the last two decades as a class of spin crossover compounds because of their hysteretic and abrupt spin crossover properties. Their use has been limited due to the difficulty to integrate them into a functional material which is still a challenge today. The main goal of this PhD. project is to address this issue by designing a metallogel reinforced by the adjunction of silica nanoparticles, allowing us to prepare a hybrid spin crossover nanocomposite. We achieved this aim by screening the physicochemical parameters of the system and carefully tuning of the experimental conditions. The resulting gel has been extensively characterized by different technics, allowing us to make assumptions for the role of each component of the system on its spin crossover properties. We improved its mechanical properties by in situ chemical vapour deposition of silica, forming a hybrid matrix by sol gel process. The resulting material is functional and easy to handle, and has been further characterized to conclude on the influence of this process on the composite spin crossover properties. Finally, a “bottom-up” approach of the iron-triazole polymer – silica system has been studied, with the aim of a triazole functionalized alcoxysilane precursor and the preparation of polymer wrapped silica nanoparticles in order to study their auto-assembling properties.
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Hugo Voisin. Mise en forme de nanocomposites par contrôle des interactions d'un métallogel fer-triazole avec la silice et étude des propriétés de transition de spin du matériau. Matériaux. Université Pierre et Marie Curie - Paris VI, 2015. Français. ⟨NNT : 2015PA066654⟩. ⟨tel-01363847⟩

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