Abstract
To study the synthesis of carbon nanotubes, a premixed Propane/Air flame with inert co-flow was employed, along with a moderate direct current Electric Field to assess the effect on mass production and morphology of nanostructures yielded with electric bias. A supported bare plate of 303L stainless steel acted as substrate for the deposition of carbon nanostructures. Mass measurements were performed, and it was concluded that applying voltage to the substrate results in increase of mass produced. For the conditions tested, applying 30 V to the substrate proved to be the optimal situation regarding mass production improvements. It was observed that the average diameter decreases when voltage is applied to the substrate and that catalytic activity is enhanced. Temperature measurements and particle image velocimetry analysis lead to the conclusion that the presence of the electric field does not affect the mixture flow, improving the production via catalysis improvement. Moreover, the mechanism of mass growth rate revealed to be similar whether in the presence of voltage or not, and for the first time a monomolecular model was proposed for its description.
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