Figure 3.

Changes of dihedral angles that are formed by the atoms in the middle two atom layers of the (7,7) nanotube. The dihedral angles are numbered from 1 to 28, corresponding to the dihedral angles from 4-3-2-1 to 3-2-1-28 in inset

Kan et al. Nanoscale Research Letters 2010 5:1144-1149   doi:10.1007/s11671-010-9617-y