Process of isolating carbon nanotubes from a mixture containing

Details Process of isolating carbon nanotubes from a mixture containing Process of isolating carbon nanotubes from a mixture containing

1994-08-01

1996-10-01

Lewis, Michael

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234472, 423445B, D01F 912, C01B 3102

Patent

active

055608981

ABSTRACT:
Carbon nanotubes are isolated from a mixture containing the carbon nanotubes and graphite particles by a process including the steps of:
finely pulverizing the mixture;
dispersing the pulverized product in a liquid medium;
centrifuging the resulting dispersion to obtain a supernatant containing carbon nanotubes and graphite particles having a particle size of 0.3 .mu.m or less;
separating the supernatant into a solid phase and a liquid phase; and
calcining the solid phase in an oxygen-containing atmosphere at a temperature sufficient to burn the graphite particles and to leave the nanotubes.

REFERENCES:
patent: 4254823 (1981-03-01), Cederqvist
patent: 5346683 (1994-09-01), Green et al.
Pang, L. S. K., et al. "Thermogravimetric Analysis of Carbon Nanotubes and Nanoparticles", J. Phys. Chem., vol. 97, #27, pp. 6941-6942 (08 Jul. 1993).
Seraphin, S., et al. "Effect of Processing Conditions on the Morphology and Yield of Carbon Nanotubes", Carbon, vol. 31, #5, pp. 685-689 (1993, no month).
T. Ebbesen, et al. "Purification of Nanotubes", Nature, vol. 369, p. 519 (10 Feb. 1994).
Ajayan, P. M., et al. "Opening Carbon Nanotubes with Oxygen and Implications for Filling", Nature, vol. 362, pp. 522-525 (8 Apr. 1993).
Saito, Y., et al. "Growth and Structure of Graphitic Tubules and Polyhedral Particles . . . ", Chem. Phys. Lett; vol. 204, #3,4, pp. 277-282 (19 Mar. 1993).
Ebbesen, et al "Large-Scale Synthesis of Carbon Nanotubes," Nature, vol. 358, 16 Jul. 1992, pp. 220-222.

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