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Method of utilizing external force to crush, wash and purify slender carbon nanotube

A technology of carbon nanotubes and crushing liquid, which is applied in the field of new materials, can solve the problems of low purity, difficult separation, and difficult separation of carbon nanotubes and carbon fibers, and achieve the effect of high purification efficiency and easy operation

Inactive Publication Date: 2002-10-16
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although conventional physical methods such as centrifugation, microfiltration, and chromatographic separation can reduce the damage to the sample, it is difficult to completely separate carbon nanotubes from other forms of carbon, especially carbon nanotubes and carbon fibers of different diameters. , so the purity of the purification is not high

Method used

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  • Method of utilizing external force to crush, wash and purify slender carbon nanotube
  • Method of utilizing external force to crush, wash and purify slender carbon nanotube
  • Method of utilizing external force to crush, wash and purify slender carbon nanotube

Examples

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Effect test

Embodiment 1

[0028] This example examines the effect of external force on the fragmentation of carbon fibers and thick carbon nanotubes and the suspension performance of their fragments in the liquid phase. The samples used are prepared by nano-agglomerated bed catalytic cracking method, and are mainly composed of carbon fibers and thick carbon nanotubes. Add 25 mg of sodium dodecylbenzenesulfonate to 100 mg of sample and grind for half an hour. The ground sample was placed in 25ml of deionized water, and the sample was dispersed using ultrasonic waves under stirring conditions. The stirring speed was 1500 rpm, the ultrasonic intensity was 5W / ml, and the ultrasonic time was 3 minutes. A suspension of the sample was obtained after ultrasonic dispersion.

[0029] Figure 2a It is a scanning electron micrograph of the original sample, in which a large number of coarse carbon fibers can be seen.

[0030] Figure 2b This is the scanning electron micrograph of the ground sample, from which m...

Embodiment 2

[0033] Examples 2-4 are purification examples. The crude sample used was prepared by nano-agglomerated bed catalytic cracking method, which contained elongated carbon nanotubes, thick carbon nanotubes and carbon fibers. Add 10 mg sodium dodecylbenzenesulfonate to 50 mg crude sample and grind for half an hour. The ground sample was placed in 25ml of deionized water, and ultrasonic waves were added to disperse the samples under stirring conditions. The stirring speed was 1800 rpm, the ultrasonic intensity was 5W / ml, and the ultrasonic time was 3 minutes. A suspension of the sample was obtained after ultrasonic dispersion. The suspension was left to settle for 2 hours, and the sediment was separated by filtration and washed with 100 ml of deionized water.

[0034] Figure 2a It is a scanning electron microscope photo of the original sample, in which impurities such as elongated carbon nanotubes and thick carbon fibers coexist.

[0035] Figure 2b It is a transmission electro...

Embodiment 3

[0038] The crude sample used contained elongated carbon nanotubes, thick carbon nanotubes, and carbon fibers. To 440 mg crude sample was added 60 mg polyoxyethylene and triturated for two hours. Place the ground sample in 500ml of deionized water, and disperse the sample in an SK2200H ultrasonic pool for 30 minutes. A suspension of the sample was obtained after ultrasonic dispersion. The sediment and the suspension were separated by centrifugation at a speed of 1000 rpm and a centrifugation time of 20 minutes.

[0039] Electron microscope observations proved that the elongated carbon nanotubes were concentrated in the sediment.

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Abstract

The present invention relates to one physical technological method of purifying slender carbon nanotube. The purifying process includes external force crushing, liquid phase dispersion, deposition, filtering and washing. By means of the characteristics of slender carbon nanotube, which is flexible, wear resistant and easy to flocculate and deposit in liquid phase, coarse carbon fiber and large carbon nanotube may be eliminated easily and nano carbon particle, fine amorphous carbon and other easy-to-suspend impurity may be eliminated. The said process has no damage to slender carbon nanotube and has high purification efficiency.

Description

technical field [0001] The invention relates to a method for purifying elongated carbon nanotubes, relates to a technology for purifying elongated carbon nanotubes, and belongs to the technical field of new materials. Background technique [0002] Carbon nanotubes (Carbon Nanotubes, abbreviated as CNTs) belong to the same category as "carbon fullerenes (C60, etc.)" in structure, and are formed by the aggregation of single carbon atoms under certain conditions (Sumio Iijima, Nature, 354 (1991 )56-58). Because of its unique structure, carbon nanotubes have many unique properties, and are expected to be widely used in composite materials, molecular components, catalyst supports, and nanoelectronic devices. (Erik T. Thostenson et al., Composites Science and Technology, 61 (2001) 1899-1912). [0003] There have been many research reports on the preparation of carbon nanotubes. There are mainly three relatively mature laboratory preparation methods: arc discharge method, laser a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 王垚魏飞吴珺
Owner TSINGHUA UNIV
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