Single-walled nanotubes geometric structure

This suggests that the geometric differences (e.g. bends, helicity, diameter, etc.) and graphitisation of the structures play important roles in the electronic behaviour. In addition, bundles of single-walled nanotubes have been shown to behave as metals with resistivities in the 0.34 x 10 to 1.0 x 10" ohm cm range... 

Highly ordered cylindrical monolayer conformations of adsorbed polymers with different wrappings in the barrel phase B at 6f = 5 for (a) at = 1.50, (b) at = 1.57, and (c) af = 0.65 (different shadings shall fecilitate the perception only). Geometric properties of these structures resemble chiral alignments of atomic structures known from single-walled nanotubes. From [321]. 

Yang, X. and Dong, J. (2005) Geometrical and electronic structures of the (5, 3) single-walled gold nanotube from first-principles calculations. Physical Review B -Condensed Matter, 71,233403-1-233403-4. 

We theoretically described the structures of single-walled BCN nanotubes. It was shown that these nanotubes are thermodynamically stable. From geometrical point of view we obtained that BCN nanotubes have selective chirality - they can have only (3n, 3m) type. So we studied two kind of BNC nanotubes with different arrangements of atoms the armchair (3,3) nanotubes and the zigzag (6,0) nanotubes. We obtained cohesive energy for some BNC-NTs and foimd that zigzag tubes are more stable than corresponding armchair tubes. We... 

In addition to the size, also the shape of NMs was shown to play a role in induction of toxicity. NMs made of the same material but in different shapes can be differently internalized into the cells, react with cell membranes, and produce different oxidative effects [6, 14]. Carbon nanomaterials with different geometric structures (single-walled carbon nanotubes [SWCNTs], MWCNTs, and fullerenes) were shown to exhibit quite different cytotoxicity and bioactivity in vitro [15]. The uptake of Au nanospheres and nanorods was also significantly different, illustrating the role of the shape on NM internalization [6, 48],... 

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