Chuang Chern helps me finish this beautiful beaded model for carbon nanohelix. There are approximately two pitches in this helicoid and twenty heptagons and pentagons. The inner rim structure is exactly the same as the type V torus. Each pitch contains about ten heptagons, suggesting that the tori with the five-fold rotational symmetry are more stable than tori with six-fold rotational symmetry.
The molecular geomtry on the right is created based on the 3D coordinate generated by a guy in Britain. Compare these geometries, I am happy to see that the pitch angle of the physical modeling constructed by beads is in good agreement with the computer-based molecular modeling.
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