Contribution des tensioactifs fluorés à la synthèse de matériaux mésoporeux : Application à la conception d'un bioréacteur

Abstract : This work deals with the study of the properties of several non-ionic fluorinated and hydrogenated surfactant based systems which are related to the synthesis of mesoporous silicate materials. One of the aims is to predict the structural and textural properties of the final material for a given application. Thus, we have proved that the cloud point curve, which is characteristic of non-ionic surfactant based systems, must be present at high temperature to obtain well-ordered materials. However, this condition is not the only one but also the ratio between the molar volumes of the hydrophilic part (VA) and the hydrophobic part (VB) of the surfactant should be taken into account. Thus, the study of several mixed systems has allowed to precise the values of VA/VB which correspond to hexagonal materials. A structural study of the fluorinated micelles have been also performed by scattering methods (neutrons and X-ray). We have shown that the presence of spherical micelles promotes the formation of ordered hexagonal materials. Moreover, the in situ observation of the hybrid mesophase formation has shed light on the cooperative templating mechanism which leads to mesostructured silica materials. The effect of the synthesis parameters onto the properties of the materials has also been studied, particularly using the factorial design method. The high hydrothermal stability of the materials prepared from fluorinated surfactant based systems has been demonstrated. Finally, the mesoporous materials prepared from fluorinated micelles have been used as a support for the immobilization of an enzyme. Furthermore, we have shown that a lipase, physically adsorbed onto these materials, can be used to catalyse an esterification reaction. This result offers an outlook for applying these mesoporous materials to bio-diesel synthesis.
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Florentin Michaux. Contribution des tensioactifs fluorés à la synthèse de matériaux mésoporeux : Application à la conception d'un bioréacteur. Autre. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10088⟩. ⟨tel-01748354⟩

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