Formation and Growth Mechanisms of Imogolite-Like Aluminogermanate Nanotubes

The growth mechanisms of imogolite-like aluminogermanate nanotubes have been examined at various stages of their formation. The accurate determination of the nucleation stage was examined using a combination of local- (XAS at the Ge−K edge and 27Al NMR) and semilocal scale technique (in situ SAXS)....

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Published inChemistry of materials Vol. 22; no. 8; pp. 2466 - 2473
Main Authors Levard, C, Rose, J, Thill, A, Masion, A, Doelsch, E, Maillet, P, Spalla, O, Olivi, L, Cognigni, A, Ziarelli, F, Bottero, J.-Y
Format Journal Article
LanguageEnglish
Published American Chemical Society 27.04.2010
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Summary:The growth mechanisms of imogolite-like aluminogermanate nanotubes have been examined at various stages of their formation. The accurate determination of the nucleation stage was examined using a combination of local- (XAS at the Ge−K edge and 27Al NMR) and semilocal scale technique (in situ SAXS). For the first time, 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 probably obtained by an edge−edge assembly of these short nanotube segments.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm902883p