Formation and Growth Mechanisms of Imogolite-Like Aluminogermanate Nanotubes
Chemistry of Materials2010Vol. 22(8), pp. 2466–2473
Citations Over TimeTop 11% of 2010 papers
Clément Levard, Jérôme Rose, Antoine Thill, Armand Masion, Emmanuel Dœlsch, Perrine Maillet, Olivier Spalla, Luca Olivi, Andrea Cognigni, Fabio Ziarelli, Jean-Yves Bottero
Abstract
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.
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