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http://en.wikipedia.org/wiki/Carbon_nanotube ... The structure of a SWNT can be conceptualized by wrapping a one-atom-thick layer of graphite called graphene into a seamless cylinder. The way the graphene sheet is wrapped is represented by a pair of indices (n,m). The integers n and m denote the number of unit vectors along two directions in the honeycomb crystal lattice of graphene. If m = 0, the nanotubes are called zigzag nanotubes, and if n = m, the nanotubes are called armchair nanotubes. Otherwise, they are called chiral. The diameter of an ideal nanotube can be calculated from its (n,m) indices as follows ...... |
2Â¥2012-11-12 18:36:29
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3Â¥2012-11-12 22:55:05
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6Â¥2012-11-13 16:21:55
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7Â¥2012-11-13 16:30:05
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10Â¥2012-11-13 19:19:03
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4Â¥2012-11-13 10:17:59
mixiao777
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5Â¥2012-11-13 10:27:39
mixiao777
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8Â¥2012-11-13 16:40:03
mixiao777
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9Â¥2012-11-13 16:41:28











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