Gels de silice hybrides dopés en particules colloïdales de smectites pour l'étude des interactions bactérie/silicate

Abstract : This work deals with the study of bacteria/silicate interactions by using new hybrid materials, i.e. hybrid silica gel dopped with colloidal smectite particles (HSG). The aims are (1) to characterize HSG physicochemical properties and (2) to get a better knowledge about mineral/bacteria interactions. In a first part of the thesis, it is shown that HSG is a fractal silica network containing well-dispersed mineral particles. Hydrothermal treatment is necessary to stabilize the HSG structure. In the second part, it is shown that diffusion of organic acids and siderophores is sufficient to explain the high efficiency of bacterial action compared to abiotic treatments. Preventing bacterial adhesion or biofilm formation at the mineral surface permits to enhance the influence of metabolites diffusion. To conclude, the advantages and limits of using HSG in environmental studies are discussed
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https://hal.univ-lorraine.fr/tel-01749802
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Djihad Oulkadi. Gels de silice hybrides dopés en particules colloïdales de smectites pour l'étude des interactions bactérie/silicate. Sciences de la Terre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0064⟩. ⟨tel-01749802⟩

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