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Preparation method of high-concentration evenly-dispersed carbon nano tube suspension liquid

A carbon nanotube, evenly dispersed technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as high organic impurities, low concentration, and insufficient stability of carbon nanotube suspensions, etc. To achieve the effect of excellent dispersion

Active Publication Date: 2017-01-04
湖北迪洁膜科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the existing defects in the surface modification process of carbon nanotubes, such as many organic impurities, insufficient stability of the carbon nanotube suspension, and low concentration, and provide a high-concentration, uniformly dispersed carbon nanotube suspension Preparation method, the method uses concentrated sulfuric acid, concentrated nitric acid to modify the surface of CNTs, and after centrifugation, dilution, and pH adjustment, a high-concentration carbon nanotube suspension that does not settle for more than 3 months can be prepared

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the ratio of 1g:50mL, pour 250ml of mixed acid (concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 3:2) into 5g of multi-walled carbon nanotubes and mix evenly to obtain a carbon nanotube mixed acid solution. Mix the carbon nanotubes The acid solution was heated to 80°C and condensed and refluxed for 6 hours, then the heating was stopped. After it was naturally cooled, it was diluted and washed with deionized water several times. The diluted and washed carbon nanotube suspension is placed in a centrifuge, and centrifuged at a speed of 10,000 rpm for 4 times for 10 minutes each time to obtain surface-modified carbon nanotubes. Add 40ml of deionized water to the carbon nanotubes precipitated by centrifugation to prepare a suspension of multi-walled carbon nanotubes, then adjust the pH to 7 with a small amount of concentrated ammonia water, and finally obtain a uniformly dispersed multi-walled carbon nanotube with a concentration of mor...

Embodiment 2

[0019] According to the ratio of 1g:20mL, pour 100ml of mixed acid (concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 3:2) into 5g of multi-walled carbon nanotubes and mix uniformly to obtain a carbon nanotube mixed acid solution. Mix the carbon nanotubes The acid solution was heated to 100°C and refluxed for 8 hours, then the heating was stopped. After it was naturally cooled, it was diluted and washed with deionized water several times. The diluted and washed carbon nanotube suspension is placed in a centrifuge, and centrifuged at a rotation speed of 10,000 rpm for 6 times, each time for 10 minutes to obtain surface-modified carbon nanotubes. Add 40ml of deionized water to the carbon nanotubes precipitated by centrifugation to prepare a suspension of multi-walled carbon nanotubes, then use a small amount of concentrated ammonia to adjust the pH to 12, and finally obtain a uniformly dispersed multi-walled carbon nanotube with a concentration of more t...

Embodiment 3

[0021] According to the ratio of 1g:30mL, pour 150ml of mixed acid (concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 3:2) into 5g of multi-walled carbon nanotubes and mix evenly to obtain a carbon nanotube mixed acid solution. Mix the carbon nanotubes The acid solution was heated to 90°C and condensed and refluxed for 7 hours, then the heating was stopped. After it was naturally cooled, it was diluted and washed with deionized water several times. The diluted and washed carbon nanotube suspension is placed in a centrifuge, and centrifuged at a speed of 10,000 rpm for 5 times, and the surface-modified carbon nanotubes are obtained by centrifugation for 10 minutes each time. Add 40ml of deionized water to the carbon nanotubes precipitated by centrifugation to prepare a suspension of multi-walled carbon nanotubes, then use a small amount of concentrated ammonia to adjust the pH to 10, and finally obtain a uniformly dispersed multi-walled carbon nanotube ...

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Abstract

The invention belongs to the technical field of carbon nano tube surface modification and particularly relates to a preparation method of high-concentration evenly-dispersed carbon nano tube suspension liquid. The method includes the steps that firstly, to-be-modified carbon nano tubes are mixed with a concentrated sulfuric acid and concentrated nitric acid mixed acid solution according to the proportion of 1 g:(20-50) ml, the mixture is heated to 80-100 DEG C and then subjected to reflux condensation for 6-8 hours for surface modification, the mixture is naturally cooled and then washed with deionized water for dilution, the modified carbon nano tubes are centrifugally separated out, finally, water is added, the material is prepared into suspension liquid, the pH is adjusted to range from 7 to 12, and the carbon nano tube suspension liquid with the mass fraction being about 10% is obtained. The suspension liquid prepared through the method is high in concentration and even in dispersion, does not contain excessive organic surfactant, and does not settle after still standing for 3 months.

Description

Technical field [0001] The invention belongs to the technical field of carbon nanotube surface modification, and specifically relates to a method for preparing a carbon nanotube suspension with high concentration and uniform dispersion. Background technique [0002] Carbon nanotubes (CNTs) were discovered by Lijima, a Japanese electron microscope expert, in 1991. It is a quasi-one-dimensional material with a hollow cylindrical structure formed by winding single or multilayer graphene sheets. Carbon nanotubes are widely used in various fields due to their small diameter, large specific surface area, large aspect ratio, and excellent physical and chemical properties. However, CNTs have a large specific surface area, and there is a strong Van der Waals effect between the tube and the tube, so it is very easy to agglomerate in the solvent and ceramic matrix. The difficulty of dispersing CNTs severely limits its application. [0003] At present, through effective surface modification ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00
Inventor 陈常连王璀璨黄小雨
Owner 湖北迪洁膜科技有限责任公司
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