Imogolites as a tool for evaluating the hazard of HARN

Levard Clément, Liu Wei, Masion Armand, Thill Antoine, Rose Jérôme, Chaurand Perrine, Auffan Mélanie, Doelsch Emmanuel, Proux Olivier, Bottero Jean Yves. 2011. Imogolites as a tool for evaluating the hazard of HARN. Mineralogical Magazine, 75 (3), n.spéc. : Goldschmidt Abstracts 2011, Résumé : 1304. Annual V.M. Goldschmidt Conference. 21, Prague, République tchèque, 14 Août 2011/19 Août 2011.

Quartile : Q2, Sujet : MINERALOGY

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 rooftileshaped 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 tube. (Texte intégral)

Mots-clés Agrovoc : structure chimique, minéralogie, sol volcanique

Mots-clés complémentaires : Nanotube

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

Champ stratégique Cirad : Hors axes (2005-2013)

Auteurs et affiliations

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

Source : Cirad - Agritrop (https://agritrop.cirad.fr/564110/)

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