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Intégration entre chimie douce et fluides complexes pour la genèse d'architectures poreuses hiérarchisées : synthèses, caractérisations et application

Abstract : This work deals with the synthesis, characterizations and applications of inorganic monoliths displaying a hierarchical porosity (macro-, meso- and/or microporosity). First, we developed two new synthetic approaches respectively based on sol-gel reactions confined within the continuous phase of either direct emulsions or foams. We established new relations between the final macroporous texture and some physicochemical parameters, which allow tuning the macroporous architecture. The properties and functions related to the scaffold's microstructure have been varied by using either different molecular precursors (silicium, titanium alkoxide) or nanobuilding blocks (SiO2 particles, V2O5 ribbons). Then, we studied the mechanism that governs the inorganic scaffold genesis inside the foam by considering the macroscopic and local drainage of diluted colloidal nanoparticles dispersions. We showed that nanoparticles aggregation preferentially occurs within the node region enhancing thus the interfacial rigidity. We revealed a nanoparticles stabilizing effect at low concentration and we proposed two mineralization mechanisms, toward respectively polymeric and particulate approaches, that allow a better understanding of the material's behaviour in drying condition. Finally, we have synthesized V2O5-carbon nanotubes foams to engineer positive electrode for lithium batteries. Preliminary results indicated that promising performance can be expected if the carbon nanotubes are homogeneously dispersed.
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https://tel.archives-ouvertes.fr/tel-00267831
Contributor : Nadine Laffargue <>
Submitted on : Friday, March 28, 2008 - 3:03:23 PM
Last modification on : Thursday, January 11, 2018 - 6:14:59 AM
Long-term archiving on: : Thursday, May 20, 2010 - 10:40:10 PM

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  • HAL Id : tel-00267831, version 1

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Florent Carn. Intégration entre chimie douce et fluides complexes pour la genèse d'architectures poreuses hiérarchisées : synthèses, caractérisations et application. Matériaux. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00267831⟩

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