Imogolite nanotubes

Fig. 47 The left part shows the structure of two imogolite nanotubes [i.e., a) the (12,0) zigzag one and b) the (8,8) armchair one]. The left part shows the variation in the total energy as a function of tube radius for (filled circles) zigzag and (open circles) armchair nanotubes. Reproduced with permission of American Chemical Society from ref. 143. 

Guimaraes, L., Enyashin, A.N., Frenzel, J., Heine, T., Duarte, H.A. Seifert, G. (2007) Imogolite nanotubes Stability, electronic, and mechanical properties. ACS Nano, 1, 362-368. 

Lee, S.U., Choi, Y.C., Youm, S.G. Sohn, D. (2011) Origin of the strain energy minimum in imogolite nanotubes. Journal of Physical Chemistry C, 115, 5226-5231. 

Zhao, M.W., Xia, Y.Y. Met, L.M. (2009) Energetic minimum structures of imogolite nanotubes A first-principles prediction. Journal of Physical Chemistry C, 113, 14834-14837. 

Fig. 5 Qualitative schematic scenario for the protoimogoiite transformation into SW or DW imogolite nanotubes. Reprinted with permission from ref. 33. Copyright 2012 American Chemical Society.

Fig. 10 Variation of the strain energy of imogolite nanotubes relative to imogolite sheet as a function of Nu. The error bars (<0.003 KJ mol" -) are smaller than symbols. The bond length evolution of Al-O and Si-O bonds is plotted in the inset of this figure. Reprinted with permission from ref. 69. Copyright 2009 American Chemical Society.

Takahara and co-workers have modified imogolite nanotubes with alkyl phosphate (3) in an aqueous solution. The XPS analysis provided evidence for the covalent bonding between imogolite surface and the phosphate groups. ... 

Imogolite A Natural Nanotube, Aqueous Synthesis, and Composite Materials... 

Guimaraes, L., Pinto, YJ4., Lourenco, M.P., Duarte, H.A., 2013. Imogolite-like nanotubes structure, stability, electronic and mechanical properties of the phosphorous and arsenic derivatives. Physical Chemistry Chemical Physics 15, 4303—4309. 

Although the nanotube (NT) term is recent, the idea of a small tubular structure is not new. In 1930, Linus Pauling (1930) proposed the existence of cylindrical structures formed by minerals in nature. Based on asbestos related minerals, Pauling proposed that if two faces of a mineral are not symmetrical, there will be a structural mismatch between the layers leading to its deformation and curvature. Chrysotile, halloysite and imogolite are examples of such structures. Unfortimately, Pauling concluded that layered materials with symmetric... 

Imogolite-like nanotubes - Gibbsite as a template for new materials... 

Bursill, L.A., Peng, J.L. Bourgeois, L.N. (2000) Imogolite An aluminosilicate nanotube material. Philosophical Magazine A, Physics of Condensed Matter Structure Defects and Mechanical Properties, 80,105-117. 

Kuc, A. Heine, T. (2009) Shielding nanowires and nanotubes with imogolite A route to nanocables. Advanced Materials, 21, 4353-+. 

Levard, C., Rose, J., Thill, A., Masion, A., Doelsch, E., Maillet, P., Spalla, O., Olivi, L., Cognigni, A., Ziarelli, F. Bottero, J.Y. (2010) Formation and growth mechanisms of imogolite-like aluminogermanate nanotubes. Chemistry Of Materials, 22, 2466-2473. 

Nanotubes with well-defined structure imogolites... 

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