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Habilitation à diriger des recherches

Optimisation des voies alcoolates pour l'élaboration de matériaux céramiques oxydes et de revêtements fonctionnels en réponse aux problématiques environnementales

Abstract : LMCPA has been renowned since 2000 for its ability to create various ceramic parts with variable geometries endowed with remarkable properties (high thermal and mechanical resistance, piezoelectricity, etc) and for its ability to synthesize the powders necessary for this manufacture. On this last point mention may be made of liquid process under autoclave ("solvothermal" process) alongside dry process production methods. The need of the LMCPA, by recruiting me was to pursue the devolpment of these liquid pathways to broaden the field of this research and to orient the physico-chemical properties of the ceramic powders thus produced. My research activities are therefore built on the basis of skills in organic synthesis and characterization methods of various molecules and macromolecules obtained by unconventional chemical processes (with or without solvent, with or wthout microwave assistance, etc). I wanted to develop work involving various organometallic precusors for development of nano and/or micrometric ceramic coating by the "sol-gel" route, carried out at atmospheric pressure to create in particular various depolluting systems (heterogeneous catalysis). This dissertation presents the most significant experimental results, accumulated through my work on the synthesis of numerous oxides and allow me today to propose theorical and practical approches related to these 2 liquid pathways (solvothermal and sol-gel) in the perspective of rational and environmentally friendly processes. The main objectve of this manuscript is to overcome the difficulties observed to achieve the gelation of mixtures of precursors, a mechanistic step common to these 2 liquid pathways (solvothermal and sol-gel) involving multi-cationic media. In other words, the gelation of multi-cationic systems? This Habilitation to Direct Research manuscript contains 3 main parts : the 1st concerns the hydrothermal route through the verification of a proposed postulate, assuming thal the bimetallic precursors are at the origin of theproperties oxides formed. The 2nd presents results obtained in the synthesis of powders and the devolpment of coatings. The 3rd targets the exploitation of modified precursors for the production of new generation nanostructured layers.
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Habilitation à diriger des recherches
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https://hal-uphf.archives-ouvertes.fr/tel-03769813
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Submitted on : Monday, September 5, 2022 - 5:56:31 PM
Last modification on : Monday, September 5, 2022 - 6:17:50 PM

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Philippe Champagne. Optimisation des voies alcoolates pour l'élaboration de matériaux céramiques oxydes et de revêtements fonctionnels en réponse aux problématiques environnementales. Matériaux. Université Ppolytechnique Hauts-de-France, 2020. ⟨tel-03769813⟩

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