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Carbon Nanofoam by Pulsed Electric Arc Discharges

The pulsed electric arc discharge was established between two graphite electrodes with 22.8 kVA of power and 150 A DC current; the cathode was relatively motionless and was made of a pure carbon rod of 6 mm diameter, and the spinner anode was a pure carbon disc spinning at 600 rpm; over the disc was an annular cavity where the new catalytic ...

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Optimization of the Ni−Y Catalyst Composition in Bulk ...

2019-5-26 · The influence of Ni−Y catalyst composition on the bulk scale synthesis of single-walled carbon nanotubes (SWNTs) is studied using solution phase near-infrared spectroscopy. We found that a wide range of catalyst concentrations (3−6 atom % Ni and 1−2 atom % Y), allow efficient production of high-purity as-prepared (AP-) SWNT soot. The broad window of acceptable synthetic parameters …

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The Electrocatalytic Properties of Arc‐MWCNTs and ...

These are formed during the electric arc discharge method of producing ultrapure MWCNTs (arc‐MWCNTs). The carbon onions are randomly dispersed amongst the arc‐MWCNTs which are produced with very little amorphous carbon deposits or other unwanted impurities and are formed as closed‐ended tubes.

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Electric field induced needle-pulsed arc discharge …

A simple and low cost apparatus is reported to produce multiwall carbon nanotubes and carbon nano-onions by a low power short pulsed arc discharge reactor. The electric circuitry and the mechanical design details and a micro-filtering assembly are described. The pulsed-plasma is generated and applied between two graphite electrodes.

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Carbon Nanotubes Synthesis via Arc Discharge with a …

A facile method is proposed to use a computer controlled Arc discharge gap between graphite electrodes together with an yttria-nickel catalyst to synthesize carbon nanotubes under an Ar-H 2 gases mixture atmosphere by applying different DC currents and pressure. This produces carbon nanotubes with decreased diameters and increased length.

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Bulk synthesis of multi-walled carbon nanotubes by …

2019-8-25 · This work proposes the production of multi-walled carbon nanotubes by AC arc discharging of spectroscopically pure graphite electrodes of different shapes, that …

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Arc Discharge Method: Sudama Chaurasiya Dr. A. …

2016-4-29 · arc discharge method for carbon nanotubes The principle of this technique is to vaporize carbon in the presence of catalysts (iron, nickel, cobalt, yttrium, boron, gadolinium, and so forth) under reduced atmosphere of inert gas (argon or helium).

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Arc Discharge Method: Sudama Chaurasiya Dr. A. …

2016-4-29 · arc discharge method for carbon nanotubes The principle of this technique is to vaporize carbon in the presence of catalysts (iron, nickel, cobalt, yttrium, boron, gadolinium, and so forth) under reduced atmosphere of inert gas (argon or helium).

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Synthesis of Boron-Doped Carbon Nanotubes With …

2018-7-6 · Synthesis of Boron-Doped Carbon Nanotubes With DC Electric Arc Discharge Abstract: ...

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Synthesis and characterization of long-CNTs by …

Carbon nanotubes (CNTs) are very attractive materials in the fields of medicine and engineering due to their unique electrical, mechanical and elastic properties [1, 2].There are various methods to produce CNTs in sizable quantities [3,4,5].Mainly CNTs are produced by arc discharge, laser ablation and chemical vapor deposition methods [6, 7].Prof.

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Production of Carbon Clusters by Means of Arc …

This paper characterizes and describes the growth of carbon nanotubes (multiwall and single-wall) and nanocapsules produced by electric arc discharge. For the preparation of multiwall nanotubes, an electrode of pure carbon is evaporated in helium gas, while single-wall nanotubes are produced with the aid of metal catalysts. When carbon is evaporated together with metals, carbon nanocages ...

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Production of Carbon Clusters by Means of Arc …

This paper characterizes and describes the growth of carbon nanotubes (multiwall and single-wall) and nanocapsules produced by electric arc discharge. For the preparation of multiwall nanotubes, an electrode of pure carbon is evaporated in helium gas, while single-wall nanotubes are produced with the aid of metal catalysts. When carbon is evaporated together with metals, carbon nanocages ...

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Influence of Plasma Jet Temperature Profiles in Arc ...

2017-2-23 · An assay of carbon nanotubes produced in arc discharge systems available on the market shows that commercial cathode deposits contain about 10% CNTs. Given that the quality of the final product depends on carbon-plasma jet parameters, it is possible to increase the yield of the synthesis by plasma jet control.