Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Reexamination Certificate
2006-08-15
2006-08-15
Hendrickson, Stuart (Department: 1754)
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
C423S447700, C423S461000
Reexamination Certificate
active
07090819
ABSTRACT:
The present invention relates to an all gas-phase process for the purification of single-wall carbon nanotubes and the purified single-wall carbon nanotube material. Known methods of single-wall carbon nanotube production result in a single-wall carbon nanotube product that contains single-wall carbon nanotubes in addition to impurities including residual metal catalyst particles and amounts of small amorphous carbon sheets that surround the catalyst particles and appear on the sides of the single-wall carbon nanotubes and “ropes” of single-wall carbon nanotubes. The purification process removes the extraneous carbon as well as metal-containing residual catalyst particles. The process comprises oxidation of the single-wall carbon nanotube material, reduction and reaction of a halogen-containing gas with the metal-containing species. The oxidation step may be done dry or in the presence of water vapor. The present invention provides a scalable means for producing high-purity single-wall carbon nanotube material.
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Chiang Wan-Ting
Gu Zhenning
Hauge Robert H.
Kittrell Wilber Carter
Smalley Richard E.
Garsson Ross Spencer
Hendrickson Stuart
Mickelson Edward T.
William Marsh Rice University
Winstead Sechrest & Minick P.C.
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