F185 (2003). Formation mechanism of H2Ti3O7 nanotubes.
Top left: TEM images showing H2Ti3O7 single crystalline plates and nanotubes. Bottom left: Competing contribution to the total energy of a multilayer shell nanotube. Top right: Schematic model showing the effect of the alkali environment and the breaking of the surface layer due to hydrogen deficiency on the surface. Bottom right: A model of the nanotubes. [S. Zhang, L. M. Peng, Q. Chen, G. H. Du, G. Dawson, W. Z. Zhou, Phys. Rev. Lett. 91, art. no. 256103 (2003)].