Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Reexamination Certificate
2006-11-21
2006-11-21
Cooke, Colleen P. (Department: 1754)
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
C427S249100, C977S842000
Reexamination Certificate
active
07138100
ABSTRACT:
A continuous gas-phase method for producing single-wall carbon nanotubes at high catalyst productivity and high yield is disclosed. The method involves the use of a novel in-situ formed catalyst to initiate and grow single-wall carbon nanotubes using a carbon-containing feedstock in a high temperature and pressure process. The catalyst comprises in-situ-generated transition metal particles in contact with in-situ-generated refractory particles. The population of nucleating sites for single-wall carbon nanotubes is enhanced due to the ease of formation of a population of refractory particles. These, in turn, improve the nucleation and stability of the transition metal particles that grow on them. The larger number of transition metal particles translate into a larger number of sites for single-wall carbon nanotube production. The higher catalyst yields provide a means for obtaining higher purity single-wall carbon nanotubes.
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Hauge Robert H.
Smalley Richard E.
Cooke Colleen P.
Mickelson Edward
Ross Spencer Garsson
Stadler Rebecca M.
William Marsh Rice Univesity
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