Process of isolating carbon nanotubes from a mixture containing carbon nanotubes and graphite particles
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United States of America Patent
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Oct 1, 1996
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N/A
app pub date -
Aug 1, 1994
filing date -
Aug 4, 1993
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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.
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