Nanoparticules naturelles : imogolites et allophanes.
Structure, mécanismes de croissance et capacité de rétention des éléments traces métalliques

Abstract : The aim of this study was to determine the fate and the mobility of heavy metals in Reunion soils intended for urban waste spreading. Unusually high heavy metal concentrations are found within these volcanic soils. Moreover, they also contain large amounts of naturally formed nanoparticles called "imogolites" (nanotubes) and "allophanes" (spheres, ovoïde, amorphous?). These short-range ordered aluminosilicates are hypothesized to trap heavy metals limiting their mobility and bioavailability.

First, a study of synthetic compounds analogous to the natural aluminosilicates allowed us to improve our knowledge of the structure and growth mechanisms of imogolites and allophanes. The synthesis of imogolite-type compounds (Si-imogolite and Ge-imogolite) has been improved significantly when compared to previous protocols. Thus, making industrial applications of these inorganic nanotubes feasible. Finally our study demonstrates the important role of natural nanoparticles on the behavior of Ni in an andosol of la Reunion. Short-range ordered aluminosilicates fix up to 80% of total Ni.
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Submitted on : Tuesday, September 8, 2009 - 1:33:31 AM
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Clément Levard. Nanoparticules naturelles : imogolites et allophanes.
Structure, mécanismes de croissance et capacité de rétention des éléments traces métalliques. Analyse de données, Statistiques et Probabilités [physics.data-an]. Université Paul Cézanne - Aix-Marseille III, 2008. Français. ⟨tel-00368753v2⟩

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