Reaction Chamber and Cathode Configurations in arc Production of Fullerenes.
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and encapsulated materials. REACTION CHAMBER A reaction chamber (Fig. 1) was designed for evacuation of the soot produced in the decomposition of graphite, towards a non heat irradiated zone. The outcoming soot from the arc decomposition of graphite electrodes was redirected by the flow of inert gas passing through a centered graphite nozzle that surrounds the high temperature zone. A mechanic pump forced the gas flow and soot towards a filtering cartridge. The flow of gas was controlled by a needle valve and maintained at a minimum value, so that no soot could go upwards. A small percentage of soot is deposited in the interior wall of the nozzle. The rest of it was collected in the cellulose cartridge of the type used in soxhlet extractions (33 mm diameter, 100 mm height). Many tests were carried out until, in similar conditions of pressure and current, the same yields as with the usual method were obtained. The interior diameter of the nozzle had to be at least 20 mm for 6.4 mm electrodes. The cathode support had a minimum interference with the flow of gas and soot. After passing through the nozzle, the soot entered a refrigerated expansion tube of 30 mm diameter. The cooling in this zone prevented the carbonization of the cellulose cartridge. The recollection of soot using this reactor configuration resulted simpler and cleaner than in the usual ones. 23 Mat. Res. Soc. Symp. Proc. Vol. 359 01995 Materials Research Society
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