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Non-destructive dispersion method of carbon nanotubes

A carbon nanotube, non-destructive technology, applied in the field of carbon nanotubes, can solve the problems of affecting performance, affecting application, and decreasing electrical conductivity, and achieves the effects of excellent electrical conductivity, stable and uniform properties, and simple method.

Inactive Publication Date: 2018-09-28
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the huge molecular weight of carbon nanotubes and the strong van der Waals force between the tubes, they are often agglomerated or entangled with each other, making it difficult to disperse uniformly into the material, thus affecting the physical properties of carbon nanotubes. Performance
At present, the more common dispersion methods of carbon nanotubes are: strong acid oxidation treatment, adding dispersant, ball milling, ultrasonic vibration, blending, etc. (Journal of Physical Chemistry C, 2007, 111, 12594-12602), but these carbon nanotubes There are some problems in the method: (1) the surface structure of carbon nanotubes will be broken by strong acid oxidation treatment, resulting in a significant decline in its electrical conductivity; (2) adding dispersants or other additives will affect the performance of carbon nanotubes or will Affect its application; (3) strong mechanical grinding method or ultrasonic vibration will also damage the structure of carbon nanotubes, thereby affecting its performance

Method used

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Examples

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Effect test

Embodiment 1

[0018] Example 1: A 500 mL four-necked flask was placed in a low-temperature bath, and the temperature of the low-temperature bath was set at -78°C. Ammonia gas was passed through, and condensed to obtain 150 mL of liquid ammonia. Add 50 mg of single-walled carbon nanotubes to the solution under magnetic stirring at 600 rpm, fully disperse the single-walled carbon nanotubes in liquid ammonia, and then add 20 mg of sodium metal to the solution to obtain a dark blue carbon nanotube dispersion stock solution. After continuing to stir and disperse for 8 hours, add 25 mL of N-methylpyrrolidone (NMP), stir for 2 hours and then remove the low-temperature bath. After the liquid ammonia has evaporated, a stable carbon nanotube dispersion can be obtained.

Embodiment 2

[0019] Example 2: A 500 mL four-necked flask was placed in a low-temperature bath, and the temperature of the low-temperature bath was set at -50° C., and ammonia gas was passed through to obtain 200 mL of liquid ammonia through condensation. Under the condition of 400rpm magnetic stirring, add 1.0g multi-walled carbon nanotubes to the solution, fully disperse the multi-walled carbon nanotubes in liquid ammonia, and then add 50mg metal potassium to the solution to obtain a dark blue carbon nanotube dispersion stock solution After continuing to stir and disperse for 2 hours, add 50 mL of tetrahydrofuran (THF), stir for 4 hours and then remove the low-temperature bath. After the liquid ammonia is volatilized, a stable carbon nanotube dispersion can be obtained.

Embodiment 3

[0020] Example 3: A 500 mL four-necked flask was placed in a low-temperature bath, and the temperature of the low-temperature bath was set at -35° C., and ammonia gas was introduced to condense to obtain 100 mL of liquid ammonia. Under the condition of 500rpm magnetic stirring, add 250 mg double-walled carbon nanotubes to the solution, fully disperse the double-walled carbon nanotubes in liquid ammonia, and then add 20 mg metal sodium potassium alloy to the solution to obtain a dark blue carbon nanotube dispersion After continuing to stir and disperse the stock solution for 12 hours, add 100 ml of N,N-dimethylformamide (DMF), remove the low-temperature bath, and obtain a stable dispersed carbon nanotube dispersion after the liquid ammonia is volatilized.

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Abstract

The invention discloses a non-destructive dispersion method of carbon nanotubes, and relates to the carbon nanotubes. The non-destructive dispersion method comprises the following steps: condensing ammonia gas in a low-temperature bath to obtain liquid ammonia, adding the carbon nanotubes under the conditions of magnetic stirring and nitrogen protection, stirring, and then adding alkali metal to obtain a carbon nanotube dispersion stoste; adding a dispersing agent into the carbon nanotube dispersion stoste, dispersing, then removing the low-temperature bath, and heating to volatilize the liquid ammonia to obtain a stable carbon nanotube dispersion. The carbon nanotubes are one-dimensional nanomaterials with a great application potential; however, due to the large molecular weight thereof and a relatively strong van der Waals force between tubes, the carbon nanotubes are agglomerated or intertwined together and are difficultly dispersed in an ordinary solvent, so that practical application is seriously affected. The existing carbon nanotube dispersion methods include a covalent modification method and a non-covalent modification method; by the covalent modification method, carbon lattices are converted from sp2 hybridization to sp3 hybridization; by the non-covalent modification method, high-power ultrasonic or ball milling is required, so that destruction of the surface structures of the carbon nanotubes is inevitably caused, and the performance thereof is affected.

Description

technical field [0001] The invention relates to carbon nanotubes, in particular to a non-destructive dispersion method for carbon nanotubes. technical background [0002] Carbon nanotubes are one-dimensional nanomaterials with great application potential. Their diameters are generally 2 to 100 nm and their lengths can reach 10 to 50 μm. They are excellent conductive agents. Carbon nanotubes can not only play the role of wires in the conductive network, but also have the electric double layer effect and high rate characteristics of supercapacitors. At the same time, the excellent thermal conductivity of carbon nanotubes is beneficial to the heat dissipation of the battery during charging and discharging, reduces the polarization of the battery, improves the high and low temperature performance of the battery, and prolongs the life of the battery. Sheem et al. (Journal of Power Sources, 2006, 158, 1425-1430) compared LiCoO with carbon nanotubes and traditional conductive carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/174
CPCC01B32/174
Inventor 邓顺柳汪凯范建标谢素原
Owner XIAMEN UNIV
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