Nanotube inorganique d'imogolite à cavité interne hydrophobe : synthèse, fonctionnalisation et encapsulation de molécules organiques

Abstract : In this work, we studied methyl-imogolite, an inorganic nanotube dispersed in water with a hydrophobic cavity.First, we examined the formation mechanisms. On a short time scale, the initial precipitates reorganize to give nano-objects with the same local structure as imogolite. Their size depends on the synthesis conditions (concentration, precursor) and could lead to the formation of cylindrical (imogolite) or spherical (allophane) objects.On a long time scale, we observed that methyl-imogolite coexists with byproducts (aluminum hydroxide, proto-imogolite and allophane). It is possible to reduce their proportion by wisely selecting the synthesis parameter (molar ratio between precursors, synthesis temperature). However, they cannot be fully eliminated. Then, we studied the functionalisation of this nanotube by substituting part of the internal methyl groups by doping ones. Encapsulation of Nile Red, a solvatochromic dye, in the internal cavity of these hybrid nanotubes highlighted the functionalisation of the imogolite with the various groups used.Finally, we investigated the encapsulation of organic molecules (polar, apolar, soluble or insoluble in water) in the nanotubes cavity. SAXS curves evidenced the trapping of all the molecules tested by methyl-imogolite. Moreover, calculated adsorption capacities are similar to the ones obtained when activated carbon or zeolites are used as adsorbents.
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Submitted on : Tuesday, April 16, 2019 - 12:14:07 PM
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Pierre Picot. Nanotube inorganique d'imogolite à cavité interne hydrophobe : synthèse, fonctionnalisation et encapsulation de molécules organiques. Chimie inorganique. Université Paris-Saclay, 2019. Français. ⟨NNT : 2019SACLS051⟩. ⟨tel-02100868⟩

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