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De la prise en compte des hétérogénéités morphologiques et structurales vers l'interprétation de la réactivité globale d'un hydroxyde d'aluminium

Abstract : Interfaces mineral oxide-aqueous medium are essential for the understanding of the reactions which take place in natural environments. The objective of this study is to interpret a macroscopic behavior (such as surface charge or a sorption process) using local mechanisms at the surface of an mineral oxide or hydroxide. Gibbsite g-Al(OH)3 was selected for this study because it presents an anisotropy of surface sites according to the exposed crystalline faces. The morphological heterogeneity of the sample (size distribution of the particles, aspect ratio) is characterized by a statistical analysis from Atomic Force Microscopy images. The structure of the OH in volume and at the surface (bond lengths and orientations, interactions between hydroxyls) is determined by infrared and Raman spectrometries. This information is used for the interpretation of potentiometric titrations and the determination of the point of zero charge of the sample.
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Marie-Camille Jodin. De la prise en compte des hétérogénéités morphologiques et structurales vers l'interprétation de la réactivité globale d'un hydroxyde d'aluminium. Autre. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10158⟩. ⟨tel-01747402⟩

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