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Preparation method of high-concentration and uniformly dispersed carbon nanotube suspension

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: 2018-12-14
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 (the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:2) into 5g of multi-walled carbon nanotubes and mix evenly to obtain a carbon nanotube mixed acid solution. The acid solution was heated to 80° C., condensed and refluxed for 6 hours, and then stopped heating. After cooling naturally, it was diluted with deionized water and washed several times. The diluted and washed carbon nanotube suspension was placed in a centrifuge, and centrifuged four times at a speed of 10,000 rpm for 10 minutes each time to obtain surface-modified carbon nanotubes. Add 40ml of deionized water to the centrifuged carbon nanotubes to prepare a suspension of multi-walled carbon nanotubes, then use a small amount of concentrated ammonia water to adjust its pH to 7, and finally obtain a uniformly dispersed concentration of multi-walled carbon nanotubes with a concentration of more than 10wt%. Tube suspension. ...

Embodiment 2

[0019] According to the ratio of 1g:20mL, pour 100ml of mixed acid (the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:2) into 5g of multi-walled carbon nanotubes and mix evenly to obtain a carbon nanotube mixed acid solution. The acid solution was heated to 100°C, condensed and refluxed for 8 hours, and then stopped heating. After cooling naturally, it was diluted with deionized water and washed several times. The diluted and washed carbon nanotube suspension was placed in a centrifuge and centrifuged 6 times at a speed of 10000 rpm for 10 minutes each time to obtain surface-modified carbon nanotubes. Add 40ml of deionized water to the centrifuged carbon nanotubes to prepare a suspension of multi-walled carbon nanotubes, then use a small amount of concentrated ammonia water to adjust its pH to 12, and finally obtain a uniformly dispersed concentration of multi-walled carbon nanotubes with a concentration of more than 10wt%. Tube suspension.

Embodiment 3

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

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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, in particular to a method for preparing a high-concentration and uniformly dispersed carbon nanotube suspension. Background technique [0002] Carbon nanotubes (CNTs) were discovered by Japanese electron microscope expert Lijima in 1991. It is a quasi-one-dimensional material with a hollow cylindrical structure wound by single-layer or multi-layer 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 strong van der Waals interaction between tubes, so they are very easy to agglomerate in solvents and ceramic matrices. The difficulty of dispersing CNTs seriously limits its application. [0003] At present, through effective surface modification and modification of carbon nanotub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/174B82Y30/00
Inventor 陈常连王璀璨黄小雨
Owner 湖北迪洁膜科技有限责任公司