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A kind of preparation method of aligned carbon nanotube thin film

A technology of oriented carbon nanotubes and carbon nanotubes, which is applied in the direction of carbon nanotubes and nanocarbons, can solve the problems of harshness, poor electromagnetic and mechanical properties, and limited application range, and achieve good magnetic properties, electrical conductivity, and compatibility excellent effect

Active Publication Date: 2018-06-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of these methods is complicated, and the conditions required for experimental instruments are harsh; the product quality is easily affected by external environmental factors; the degree of orientation of carbon nanotubes and the thickness and density of aligned carbon nanotube films cannot be controlled during the preparation process. Effective control; the prepared carbon nanotube film has poor self-supporting properties, poor electromagnetic and mechanical properties, which greatly limits its application range

Method used

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  • A kind of preparation method of aligned carbon nanotube thin film
  • A kind of preparation method of aligned carbon nanotube thin film
  • A kind of preparation method of aligned carbon nanotube thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] step 1

[0034] Add 3g of carboxylated carbon nanotubes with a diameter of 50-80nm, 5ml of anhydrous acetic acid, 95ml of anhydrous ethanol, and 2ml of silane coupling agent KH550 into a round bottom flask, mix well, seal and ultrasonically disperse for 30 minutes, and react at 50°C for 24 Hour. The product was washed with absolute ethanol, centrifuged three times, 20 minutes each time, and the rotating speed was 4000r / min. Vacuum filtration is performed after centrifugation, and the pore size of the microporous membrane is 220 nm. The suction-filtered product was dried in a vacuum oven at 40°C to obtain dry CNT-NH 2 .

[0035] step 2

[0036] Add 1.5 g of CNT-NH to the round bottom flask 2 , 50ml of tetrahydrofuran (THF) and 5ml of triethylamine, ultrasonically dispersed for 40min, put the flask in an ice bath, add 2ml of α-bromoisobutyryl bromide, 10ml of THF in the constant pressure dropping funnel, and drop them into the flask. After dropping, the reaction was...

Embodiment 2

[0050] step 1

[0051] Add 3g of carboxylated carbon nanotubes with a diameter of 50-80nm, 5ml of anhydrous acetic acid, 95ml of anhydrous ethanol, and 3ml of silane coupling agent KH550 into a round bottom flask, mix well, seal and ultrasonically disperse for 30 minutes, and react at 50°C for 24 Hour. The product was washed with absolute ethanol, centrifuged three times, 20 minutes each time, and the rotating speed was 4000r / min. Vacuum filtration is performed after centrifugation, and the pore size of the microporous membrane is 220 nm. The suction-filtered product was dried in a vacuum oven at 40°C to obtain dry CNT-NH 2 .

[0052] step 2

[0053] Add 1 g of CNT-NH to a round bottom flask 2 , 30ml of tetrahydrofuran (THF) and 5ml of triethylamine, ultrasonically dispersed for 40min, put the flask in an ice bath, add 2ml of α-bromoisobutyryl bromide, 5ml of THF into the constant pressure dropping funnel, and drop them into the flask. After dropping, the reaction was ca...

Embodiment 3

[0067] step 1

[0068] Add 3g of carboxylated carbon nanotubes with a diameter of 50-80nm, 5ml of anhydrous acetic acid, 95ml of anhydrous ethanol, and 3ml of silane coupling agent KH550 into a round bottom flask, mix well, seal and ultrasonically disperse for 30 minutes, and react at 50°C for 24 Hour. The product was washed with absolute ethanol, centrifuged three times, 20 minutes each time, and the rotating speed was 4000r / min. Vacuum filtration is performed after centrifugation, and the pore size of the microporous membrane is 220 nm. The suction-filtered product was dried in a vacuum oven at 40°C to obtain dry CNT-NH 2 .

[0069] step 2

[0070] Add 1 g of CNT-NH to a round bottom flask 2 , 30ml of tetrahydrofuran (THF) and 5ml of triethylamine, ultrasonically dispersed for 40min, put the flask in an ice bath, add 2ml of α-bromoisobutyryl bromide, 5ml of THF into the constant pressure dropping funnel, and drop them into the flask. After dropping, the reaction was ca...

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Abstract

The invention discloses a preparation method of an oriented carbon nanotube film, and belongs to the field of film material preparation. The preparation method is characterized by comprising the following steps: step A, adopting a magnetic multi-walled carbon nanotube, which is prepared by steps of subjecting carboxylated multi-walled carbon nanotubes to polymeric modification and evenly loading magnetic particles on the modified multi-walled carbon nanotubes through a chemical co-precipitation method; step B, adding the obtained magnetic carbon nanotubes obtained in the step A into a solvent, mixing, and fully dispersing the carbon nanotubes to obtain a stable carbon nanotube solution; step C, adopting a vacuum suction filtration method: pouring the magnetic carbon nanotube solution obtained in the step B into a vacuum suction filtration device, applying a magnetic field on the device, and changing the direction of the magnetic field so as to obtain an in-plane vertical oriented film or an in-plane horizontal oriented film; step D, removing the substrate film by liquid nitrogen so as to obtain the oriented carbon nanotube film. The method is simple and efficient, the film structure is uniform and complete; the orientation degree can be controlled by changing the strength of magnetic field and the grafting rate of magnetic nano particles on the carbon nanotubes, and the integrity of oriented film structure is guaranteed by spraying liquid nitrogen.

Description

technical field [0001] The invention belongs to the field of film material preparation, and in particular relates to a method for polymer-modified carbon nanotube orientation and film formation. Background technique [0002] Due to their unique structure and surface properties, carbon nanotubes have excellent physical, chemical, electrical, optical, and mechanical properties, and are widely used in many fields such as chemical industry, electronics, and energy. In order to further expand the application field of carbon nanotubes, the development of macroscopic materials composed of carbon nanotubes has become one of the feasible ways. At present, macro-scale carbon nanotube bulk materials include arrays, films, fibers, etc. Among them, carbon nanotube films have attracted much attention due to their simple preparation methods, excellent electrical conductivity and wide application fields. However, due to the van der Waals force, carbon nanotubes are easily entangled with ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/158
CPCC01P2006/42
Inventor 贾晓龙徐先娟曹阳李武胜蔡晴杨小平
Owner BEIJING UNIV OF CHEM TECH