Pentagons, heptagons and negative curvature in graphite microtubule growth

@article{Lijima1992PentagonsHA,
  title={Pentagons, heptagons and negative curvature in graphite microtubule growth},
  author={Sumio Lijima and Toshinari Ichihashi and Yoshinori Ando},
  journal={Nature},
  year={1992},
  volume={356},
  pages={776-778}
}
THE standard carbon-arc synthesis for fullerenes also produces graphitic microtubules with helical structures1. In most cases the cylindrical tubes are closed by polyhedral caps, some being first transformed into a conical shape before closure2. Here we present images from transmission electron microscopy of a further kind of growth morphology, in which cone-like growth is transformed into cylindrical growth by the incorporation of a defect that induces negative curvature. We suggest that the… CONTINUE READING
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