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Dispersion method for carbon nanotubes

A technology of carbon nanotubes and carbon nanotube bundles, which is applied in the field of carbon nanotube dispersion, can solve the problems of destroying the structure of carbon nanotubes and reducing the electrical and heat transmission performance of carbon nanotubes, and achieves the effect of simple and easy method

Active Publication Date: 2012-02-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for dispersing carbon nanotubes without additives and without destroying the structure, which solves the problem of using additives to reduce the electric heat transfer performance between carbon nanotubes or functionally destroying the structure of carbon nanotubes in the prior art

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  • Dispersion method for carbon nanotubes
  • Dispersion method for carbon nanotubes
  • Dispersion method for carbon nanotubes

Examples

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Embodiment 1

[0024] Embodiment 1 Place 50mg of single-walled carbon nanotubes prepared by chemical vapor deposition in 30ml of fuming sulfuric acid (containing 20wt% SO 3 ), heated and stirred at 120°C for 4 days to complete the intercalation and swelling process; slowly added the above carbon nanotube / oleum mixture into 10ml of 65wt% nitric acid, and reacted at 70°C for 1 hour to complete the selection Spontaneous oxidation process, and finally dilute to 250ml with distilled water and filter to obtain spontaneously dispersed single-walled carbon nanotubes. According to statistics under the atomic force microscope, it is found that 48% of the carbon nanotubes in the dispersion exist in a single state, and the rest are carbon nanotube bundles; the average diameter of a single carbon nanotube is 1-4nm, and the diameter of 93% of the carbon nanotube bundles is less than 6nm .

Embodiment 2

[0025] Embodiment 2 Place the single-walled carbon nanotubes prepared by 50mg electric arc method in 30ml oleum (containing 20wt% SO 3 ), heated and stirred at 80°C for 4 days to complete the intercalation and swelling process; the above carbon nanotube / oleum mixture was slowly added to 10ml of 65wt% nitric acid, and reacted at 80°C for 1 hour to complete Selective oxidation process, finally diluted with distilled water to 250ml and filtered to obtain spontaneously dispersed single-walled carbon nanotubes. After spontaneous dispersion in alcohol, 45% of the carbon nanotubes exist in a single state, and the rest are carbon nanotube bundles; the average diameter of a single carbon nanotube is 1-4nm, and 90% of the carbon nanotube bundles have a diameter less than 6nm.

Embodiment 3

[0026] Example 3 Place 50 mg of double-walled carbon nanotubes prepared by chemical vapor deposition in 30 ml of chlorosulfonic acid, heat and stir at 25° C. for 4 days to complete the intercalation and swelling process; mix the above carbon nanotubes / chlorosulfonic acid The solution was slowly added to 10ml of 65wt% nitric acid, reacted at 90°C for 1 hour to complete the selective oxidation process, and finally diluted with distilled water to 250ml and filtered to prepare spontaneously dispersible carbon nanotubes. After spontaneous dispersion in acetone, 50% of the carbon nanotubes exist in a single state, and the rest are carbon nanotube bundles; the average diameter of a single carbon nanotube is 1.5-6nm, and the diameter of 85% of the carbon nanotube bundles is less than 8nm.

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Abstract

The invention relates to the field of dispersion of carbon nanotubes and is a dispersion method for carbon nanotubes, and the method is applicable to uniform and stable dispersion of carbon nanotubes in water and a variety of organic solvents and overcomes the problem of degraded electrothermal transmission performance among carbon nanotubes or functional damage to the structure of carbon nanotubes in the prior art because of utilization of additives. According to the invention, carbon nanotubes are subjected to intercalation and swelling in super acids with oleum or chlorosulfonic acid as a representative, and carbonaceous byproducts in a resultant are selective functionalized by nitric acid; therefore, the carbon nanotubes spontaneously disperse into water and commonly used organic solvents like ethanol and acetone. Most of the carbon nanotubes dispersed by using the method exist in a solvent in the form of a single tube or a tiny tube bank, and the structure of the carbon nanotubes are not damaged; dispersed carbon nanotubes can be widely applied in the fields like film electronics and composite materials.

Description

technical field [0001] The invention relates to the field of dispersing carbon nanotubes, in particular to a new method for dispersing carbon nanotubes. Background technique [0002] Due to their unique structure and excellent performance, carbon nanotubes have potential applications in many fields such as nanoelectronic devices, energy storage devices, structural and functional composite materials. However, due to the strong van der Waals interaction between carbon nanotubes (~500eV·μm -1 ) and large aspect ratio (>1000), it is usually easy to agglomerate to form large tube bundles and difficult to disperse, which greatly restricts the exertion and application of its excellent performance. [0003] At present, the main dispersion methods of carbon nanotubes in solution are: non-covalent functionalization method, covalent functionalization method and solvent stripping method. Their common feature is that they all need to use strong mechanical force, such as high-frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F3/12B01J8/00
Inventor 杜金红刘文彬裴嵩峰苏阳成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI