[12635] in libertarians
Home-based work for you
daemon@ATHENA.MIT.EDU (dael benjie)
Sat Sep 15 15:24:32 2007
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From: "dael benjie" <aileen@olgafilippova.com>
To: <libertarians-discussion@mit.edu>
Date: Sat, 15 Sep 2007 17:36:44 +0000
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Nature's own marvelous nanoscale machines include motors that spin bacterial flagella at up to 1000 revolutions per second and polymerases that step along DNA and RNA to facilitate the flow of genetic information. Block, along with other Stanford researchers such as Professors W. E. Moerner (Chemistry) and Steve Chu (Physics), are studying Nature's machines through single molecule science. This young field is devoted to following molecules one at a time rather than observing their averaged behavior, as has been done traditionally. To understand why average properties may obscure molecular behavior, "Consider a ship traveling from New York to San Francisco," says Block. "If it's small enough, it will travel down into the Caribbean and go across the Panama Canal and then back up to San Francisco. If it's a big oil tanker, it won't fit through the Panama Canal; it's got to go all the way around Cape Horn. But the average path of a ship traveling from New York to San Francisco wo
uld probably come out somewhere in the middle of the Amazon where there is in fact no route at all!"
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As a term, nanotechnology is clearly ambiguous. Moreover, it has already been claimed by the Drexlerians, apostles of K. Eric Drexler, who was one of the first to popularize nanotechnology with the publication of his 1987 book, Engineers of Creation: The Coming Era of Nanotechnology. According to Professor Steve Block, the Drexlerians have a futurist vision of nanotechnology in which self-replicating molecular assemblers programmed at the molecular-scale manufacture arbitrary products at the atomic level, molecule by molecule, bottom up. Some scientists have attempted to distance themselves from the futurist Drexlerians by claiming the term nanoscience. There's also another motivation for the excision of "technology" in this term. Nanoscience, as a term, captures the learning-the fundamental understanding of processes and materials at the nanoscale-that many scientists feel is necessary before or at the same time that researchers turn to engineering solutions. The term nanote
chnology, on the other hand, reinforces what Chidsey describes as a "glib attitude" that "technology is the goal of science at this length scale."
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.
