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Method for Mass Producing Large Fullerene Type Carbon Clusters Using Localized Heating Sources

IP.com Disclosure Number: IPCOM000121691D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

Bethune, DS: AUTHOR [+4]

Abstract

Disclosed is a method for mass producing the pure carbon molecules known as fullerenes by using localized heating of carbon under an atmosphere of inert gas. This heating may be accomplished by various means, including an electric arc, a laser beam, or by RF induction heating. The C60 and C70 molecules can be extracted by subliming them directly out of the carbon soot.

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Method for Mass Producing Large Fullerene Type Carbon Clusters Using
Localized Heating Sources

      Disclosed is a method for mass producing the pure carbon
molecules known as fullerenes by using localized heating of carbon
under an atmosphere of inert gas.  This heating may be accomplished
by various means, including an electric arc, a laser beam, or by RF
induction heating.  The C60 and C70 molecules can be extracted by
subliming them directly out of the carbon soot.

      The large stable carbon clusters called fullerenes, and in
particular C60 and C70, can be produced readily by evaporation of
graphite under an inert gas atmosphere [1-3]. The use of localized
heating, for example, CW laser or RF induction heating of the end of
a carbon rod, allows a dense neutral carbon vapor to be produced in a
clean manner. Preheating can be used to clean the carbon before
vaporization.  The combination of very clean conditions and a clean,
controllable heating method allows fullerene production to be
optimized.

      Solvent extraction has been used to separate the fullerene
species from the carbon soot [2,4].  However, the use of large
quantities of solvent may be undesirable.  An alternative process for
extracting the C60 and C70 clusters is to directly sublime them from
the raw soot [5].  This provides an effective initial purification
step without requiring or introducing solvent and is comparable to
solvent extraction in efficiency.  Localized heating and d...