JANUS 1 (IMAGE)
Caption
Rice University researchers have determined that an odd, two-faced 'Janus' edge is more common than previously thought for carbon nanotubes growing on a rigid catalyst. The conventional nanotube at left has facets that form a circle, allowing the nanotube to grow straight up from the catalyst. But they discovered the nanotube at right, with a tilted Janus edge that has segregated sections of zigzag and armchair configurations, is far more energetically favored when growing carbon nanotubes via chemical vapor deposition.
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Illustration by Evgeni Penev/Rice University
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