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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 7:10 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Investigation of transport and deposition of
species in an arc discharge reactor with carbon
electrodes
Authors:
M. Stancu (1), G. Ruxanda(1), S.
Vizireanu(2), G. Dinescu(2), D. Ciuparu(1)
Affiliation:
(1) Petroleum Gas University of Ploiesti, Physics
Department, Bucharest Blvd. 39, 100680 Ploiesti,
Romania,
(2)National Institute for Laser, Plasma and Radiation
Physics, Magurele MG 36, 077125, Bucharest, Romania
E-mail
elaela11@yahoo.com
Keywords:
arc discharge, carbon soot, carbon
nanostructures
Abstract:
In the process of synthesizing carbon nanostructures
by arc discharge between two electrodes of different
diameters, in addition to the carbonaceous fine
product a solid deposit is formed on the larger
diameter electrode. This deposit is considered as
having a negative influence, although it has a large
amount of nanostructures, because it impedes
maintaining a constant discharge current. The present
paper discusses the mechanism of the formation of the
carbonaceous deposit on the larger diameter electrode.
Among the driving forces of the deposit formation we
have considered the thermophoretic force and the
impact force of the flux consisting of carbon atoms
resulted by the evaporation of the smalled diameter
electrode. Based on our experimental results we have
analyzed the contribution of each of these components
taking into account the environment affected by the
presence of the electrical forces in the arc. We have
observed that, independently of the type of current
used (AC or DC) both the thermophoretic and impact
forces have major contributions to the formation of
the carbonaceous deposit on the larger diameter
electrode.
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