Microémulsions solidifiées : une nouvelle voie pour les conducteurs protoniques ?

Cécile Noirjean 1
1 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : Proton-exchange membrane is an important part of fuel cells. It allows protons to move from one electrode to the other while producing energy. Proton conduction in current membranes is optimum at 80°C and very sensitive to water. It is therefore necessary to build new proton-exchange membranes to design fuel cells that are effective at ambient temperature and less water-sensitive.During my PhD, we intend to prepare solidified microemulsions as proton-exchange membranes. Microemulsions are nanostructured liquids composed of water, oil and surfactants at thermodynamic equilibrium. Bicontinuous microemulsions, made of water and oil channels separated by surfactants, obtained using proton conducting surfactants should have interesting proton conductivity. It is then necessary to solidify the obtained liquid to be able to use them as proton-exchange membrane. In this study, we use oil that is solid at room temperature to overcome this trouble. Two systems, with an oil solid at room temperature and proton-conducting surfactants, were studied. Bicontinuous microemulsions are prepared above the melting point of the oil. The point is then to understand how cooling down the liquid microemulsion allow to prepare a solidified microemulsion which is a solid with the same nanostructure as the initial liquid. This study highlights the influence of crystallization on nanostructure during cooling.
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Cécile Noirjean. Microémulsions solidifiées : une nouvelle voie pour les conducteurs protoniques ?. Matériaux. Université de Versailles-Saint Quentin en Yvelines, 2014. Français. ⟨NNT : 2014VERS0023⟩. ⟨tel-01128869⟩



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