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granny dai ihao at 4ur.com
Tue Sep 25 18:24:05 EEST 2007


Yet, there remains a problem with the "nano" in both nanoscience and nanotechnology. "Nanotechnology's a term with not too much new in it. It existed a long time ago," says Dai. Indeed, the characteristic length of bonds that have always been under scrutiny in the molecular sciences is on the order of a nanometer. Chidsey adds, "I worry that the term confuses people about what's important: the length scale itself is not important." Rather, it is the novel properties that structures exhibit at the nanoscale that is. As Dai puts it, "We work on carbon nanotubes not because they are small, but because they are interesting. They just happen to be nano." For all the problems with the term nanotechnology, though, it may have done some good. Chidsey remarks, "Just as nanotechnology has attracted the attention of outsiders, it also stimulates us internally: it provides a context for tackling and defining grand challenges-things so out there you wouldn't tackle them otherwise."





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Materials: Carbon Nanotubes Dr. Hongjie Dai, Chemistry Slice a layer of pencil lead, roll it up, and you have a carbon nanotube: a graphene sheet (a layer of graphite) rolled up into a cylinder. "A carbon nanotube is a clever way of making a fully saturated nanowire structure-a 1-D structure with all its atoms fully bonded," explains Professor Dai, who has developed catalysts that control where carbon nanotubes grow. "The big challenge is controlling the synthesis. More control leads to definite physical properties," says Dai. In contrast to conventional semi-conductors, where "the surface atoms are not happily bonded," as Dai puts it, the high degree of structural perfection in nanotubes leads to ballistic transport of electrons, which translates into high speed electronics. Dai predicts that while it is doubtful that carbon nanotubes will overtake the electronics industry, it is quite possible that they will replace some electronics components.





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