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The effects of the discharge current direction with respect to gravity and a steady magnetic field on the production of single-walled carbon nanotubes (SWNTs) by the arc discharge method are examined. In the experiment, highly dense electrons in the arc plasma collide with He gas atoms at a frequency of ~3.510 Hz, and the electron energy is effectively transferred to the gas atoms to accelerate them to a speed greater than that of the natural heat convection. The production rate of soot changes with the direction of the discharge current. When a magnetic field is applied, electrons in the arc plasma are accelerated in the J  B direction by the Lorentz force, resulting in an increase in the production rate of soot and the efficiency of SWNT production.

Effects of Magnetic Field and Gravity on Single-Walled Carbon Nanotube Production in Three Directions of Arc Discharge Current