Nanotubes d’imogolite et propriétés de l’eau confinée : organisation, structure et dynamique

Mohamed Salah Amara 1, 2
2 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 : This work is dedicated to the study of the structure and to the confinement properties of water in imogolite nanotubes. These aluminosilicate (germanate) inorganic nanotubes exist as single (SW) and double-walled (DW) nanotubes with diameters in the nanometer range. This study concerns the synthesis of imogolite nanotubes, the control of their self-assembling, their structure and deformation, and the properties of confined water.In the first two chapters, we present the state of art on the subject and we describe the different experimental methods used in this work. The third chapter is dedicated to the synthesis of the nanotubes and the properties of hybrid nanotubes. We first present a new method of synthesis allowing the increase of an order of magnitude of the length of double-walled nanotubes; secondly, we demonstrate the affinity of the organic molecule bromopropanol with the methylated hybrid nanotubes.Next chapter focuses on the determination of the atomic structure of different types of imogolite: natural and synthetic, silicon or germanium-based, SW and DW. Results are obtained from computational models based on a geometrical structure minimization, in agreement with the results of small- and wide-angle X-Ray scattering experiments.In the next chapter, we explain how to control the self-assembling and organization of imogolites in powder. Moreover, we analyze the shape deformation of the nanotubes according to their organization.In the last chapter, we describe the behavior of confined water molecules in the imogolite powder as a function of temperature. By combining X-Ray and inelastic neutron scattering techniques, we propose the following sequence for dehydration: external water ‒ confined water in the tube center ‒ bounded water. Dynamical properties of confined and bounded waters are found to be drastically different.
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Mohamed Salah Amara. Nanotubes d’imogolite et propriétés de l’eau confinée : organisation, structure et dynamique. Matière Molle [cond-mat.soft]. Université Paris Sud - Paris XI, 2014. Français. ⟨NNT : 2014PA112400⟩. ⟨tel-01249568⟩

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