NASA Wins Nanotechnology Award 36
Roland Piquepaille writes "NASA is rarely associated with nanotechnologies. But one of its researchers working at the NASA's Goddard Space Flight Center just received a Nanotech Briefs Nano 50 award for a manufacturing process for high-quality carbon nanotubes (CNTs). Because of its ability to produce bundles of CNTs without using a metal catalyst, this method is simpler, safer, and cheaper than current ones. The CNTs produced by this process are also purer and well suited for medical applications."
The actual patent (Score:4, Informative)
Abstract:
"A non-catalytic process for the production of carbon nanotubes includes supplying an electric current to a carbon anode and a carbon cathode which have been securely positioned in the open atmosphere with a gap between them. The electric current creates an electric arc between the carbon anode and the carbon cathode, which causes carbon to be vaporized from the carbon anode and a carbonaceous residue to be deposited on the carbon cathode. Inert gas [*] is pumped into the gap to flush out oxygen, thereby preventing interference with the vaporization of carbon from the anode and preventing oxidation of the carbonaceous residue being deposited on the cathode. The anode and cathode are cooled while electric current is being supplied thereto. When the supply of electric current is terminated, the carbonaceous residue is removed from the cathode and is purified to yield carbon nanotubes."
I assume this means she's identified the electric properties of the metal catalyst as the significant factor in the success of those techniques, and simply, with genius, replaces those properties with an electric current. You could probably do the same thing using a metamaterial or an EM radiation cavity, if you wanted to bypass the patent.
* "Intert gas" is usually helium, or the much, much cheaper alternative of nitrogen.