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September 2007

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lincoln irma <[log in to unmask]>
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Miami Univ LSHAPE <[log in to unmask]>
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Wed, 12 Sep 2007 06:36:54 +0000
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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."
18 Stanford Scientific Review successfully demonstrated their use as highly sensitive toxic gas sensors, and with Professor Calvin Quate (Electrical Engineering), has commercialized nanotubes as scanning probe tips to increase probe resolution and tip durability. An area that Dai has just begun exploring is the drug delivery potential of carbon nanotubes. "The tube has a large surface area and is empty inside. So either you can attach the drug to the outer surface, or fill it up like a test tube," says Dai. Furthermore, multiple functional molecules can be attached to the surface: "Say, a molecule that fluoresces to tell you where the drug is in the cell and an antibody that specifically targets the site of drug delivery." So far, Dai reports that his research finds nanotubes to be quite "biologically friendly."
Just this April, a large cross-departmental group of Stanford faculty was awarded a multi-million dollar grant to take up such challenges and develop new devices and technology for use in 3-D ICs. Chidsey, for instance, is one of the researchers involved in integrating nanowire transistors into 3-D circuits, which requires being able to position nanowires reliably and accurately. With the development of 3-D ICs, you can expect all-in-one MP3 player-telephone-digital camera-PDA devices the size of Star Trek communicators to hit the shelves at Fry's within this decade.

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