Reactivity and toxicity of imogolite nanotubes

Liu Wei, Levard Clément, Masion Armand, Chaurand Perrine, Auffan Mélanie, Rose Jérôme, Doelsch Emmanuel, Thill A., Bottero Jean Yves. 2011. Reactivity and toxicity of imogolite nanotubes. In : Fundamental for life: soil, crop and environmental sciences. ASA, CSSA and SSSA 2011 International Annual Meetings, October 16-19, 2011, San Antonio, Etats-Unis; ASA; CSSA; SSSA. s.l. : s.n., Résumé, 1 p. ASA, CSSA and SSSA 2011 International Annual Meetings, San Antonio, États-Unis, 16 Octobre 2011/19 Octobre 2011.

Note générale : Emmanuel Doelsch est l'expert invité du Cirad

Résumé : Since the discovery of carbon nanotubes (NTs), there has been great interest in the synthesis and characterization of similar shaped structures like inorganic nanotubes, nanorods, or nanowires. Imogolites (Al2SiO3(OH)4) are natural aluminosilicate single wall nanotubes. To date, only Ge-Al imogolite analogues have been successfully synthesized 100 times more concentrated than Si-Al imogolites. The growth mechanisms of imogolite-like aluminogermanate nanotubes were examined using a combination of local- (XAS at the Ge-Kedge and 27Al NMR) and semilocal scale techniques (in situ SAXS). A model is proposed for the precursors of the nanotubular structure and consist in rooftile-shaped particles, up to 5 nm in size, with ca. 26% of Ge vacancies and varying curvatures. These precursors assemble to form short nanotubes/nanorings observed during the aging process. The final products are most likely obtained by an edge-edge assembly of these short nanotube segments. Two structures are revealed by SAXS: at 0.25M of Al the Al-Ge imogolite are double-walled NTs whereas at 0.5 M single-walled NTs are obtained. First tests to reveal cyto and genotoxicity on various vertebrates cells (human fibroblasts and CHO-K1) are interesting. They show a genotoxicity for concentrations from 8 10-5 g/L and effects decreasing from proto-imogolite to long tubes. (Texte intégral)

Mots-clés Agrovoc : sol volcanique, structure chimique, propriété physicochimique, toxicité du sol

Mots-clés complémentaires : Nanotube

Classification Agris : P33 - Chimie et physique du sol
000 - Autres thèmes

Auteurs et affiliations

• Liu Wei, Université Paul Cézanne (FRA)
• Levard Clément, CNRS (FRA)
• Masion Armand, CNRS (FRA)
• Chaurand Perrine, Université Paul Cézanne (FRA)
• Auffan Mélanie, Université Paul Cézanne (FRA)
• Rose Jérôme, CNRS (FRA)
• Doelsch Emmanuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-7478-4296
• Thill A.
• Bottero Jean Yves, CNRS (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/564116/)

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