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Equipment for synthesizing multi-wall carbon nanotubes by water protection method

A technology of multi-walled carbon nanotubes and arc method, which is applied in the field of devices for synthesizing multi-walled carbon nanotubes, can solve problems such as poor graphitization of carbon nanotubes, affecting the quality of carbon nanotubes, and unstable arcs, etc., to achieve Simple structure, low cost, improved yield and purity

Inactive Publication Date: 2003-01-15
TSINGHUA UNIV
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Problems solved by technology

However, this method cannot be realized at room temperature
In 2001, Hsin et al. introduced a method for preparing multi-walled carbon nanotubes by arcing two graphite electrodes in an aqueous solution of cobalt sulfate (Adv.Mater., 2001, Vol.13, P.830-833), However, the degree of graphitization of the carbon nanotubes prepared by them is not very good. This is because a large number of bubbles will be generated around the arc area when the arc is generated, making the arc unstable and affecting the quality of the carbon nanotubes.

Method used

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  • Equipment for synthesizing multi-wall carbon nanotubes by water protection method
  • Equipment for synthesizing multi-wall carbon nanotubes by water protection method
  • Equipment for synthesizing multi-wall carbon nanotubes by water protection method

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[0011] The present invention mainly comprises a water container 1, an anode rod 3 placed in water, a cathode rod 5 and a protective cover placed on the electrodes. Inside; the catalyst 4 is filled in the anode rod, the liquid in the container 1 is deionized water 2, and the cathode and anode are placed vertically, or horizontally or obliquely. like figure 2 As shown, this embodiment adopts DC welding power supply (30V, 50A), anode rod 3 is connected to the positive pole of the power supply, cathode rod 5 is connected to the negative pole of the power supply, and 1 is a plexiglass water container (long 200mm, wide 200mm, high 200mm), anode carbon The diameter of the rod is 6mm, the length is about 50mm, there are small holes drilled on it, the diameter is 3.2mm, the depth is 20-30mm, and the catalyst (Ni, Y 2 o 3 , graphite powder mixture, the atomic ratio of Ni:Y is 4.2:1, the graphite powder accounts for 95% of the total weight of the mixture), the cathode carbon rod has a...

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Abstract

An equipment for synthesizing the multi-wall carbon nanotubes by water protected arc method features that a protecting pox with downward opening is arranged for the arc region between anode and cathode. In the beginning stage, the gas generated by arc can expel water from the protecting box to form a gas reaction chamber. Its advantages are less loss of carbon as less water vapour taking part in reaction with electrode, high arc stability, high output and impurity of nanotubes, and low cost.

Description

technical field [0001] The invention relates to a device for synthesizing multi-wall carbon nanotubes by using an arc method, in particular to a device for synthesizing multi-wall carbon nanotubes by using a water-protected arc method. Background technique [0002] Since the discovery of multi-walled carbon nanotubes, they have shown important value in both theoretical research and practical application. Catalytic cracking process to prepare multi-walled carbon nanotubes (Appl.Phys.Lett., 1998, Vol.72, P.2912-2913) is a relatively common method for preparing multi-walled carbon nanotubes, because this method may realize carbon Therefore, the continuous production of nanotubes is considered to be the most likely method to realize the large-scale industrial preparation of carbon nanotubes. However, the purity of multi-walled carbon nanotubes prepared by this method is relatively low, and the degree of graphitization is relatively poor, which is closer to carbon fibers; in add...

Claims

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Application Information

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IPC IPC(8): B01J19/08C01B31/02
Inventor 李雪松朱宏伟徐才录吴德海
Owner TSINGHUA UNIV
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