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Method for screening carbon nano tubes by using rotating electrophoresis

A technology of carbon nanotubes and spin electrophoresis, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as poor wettability of metal substrates, easy aggregation of carbon nanotubes, and restrictions on the wide application of carbon nanotubes with excellent performance , to achieve the effect of increasing the percentage content and uniform distribution, and solving the problem of easy agglomeration

Inactive Publication Date: 2014-07-02
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon nanotubes are easy to agglomerate, difficult to disperse and separate, and have poor wettability with metal substrates. Wide application in the field

Method used

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  • Method for screening carbon nano tubes by using rotating electrophoresis
  • Method for screening carbon nano tubes by using rotating electrophoresis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Adopt spin electrophoresis screening diameter of the present invention to be the carbon nanotube of 1~10nm, its implementation process is, as figure 1 and figure 2 shown.

[0019] (1) Purification of carbon nanotubes: carbon nanotubes 10 with a diameter of 2-50nm and a length of 0.1-500μm are mixed with sulfuric acid with a concentration of 25% and nitric acid with a concentration of 56% at a volume ratio of 1:1 In the formed mixed acid solution, then heat the mixed acid solution to 80°C, pickle the carbon nanotubes 10 for 6 hours, cool to room temperature, filter and wash with deionized water, and vacuum dry at 100°C for 1 hour;

[0020] (2) Surface modification of carbon nanotubes: add the purified carbon nanotubes 10 into the surface modification tank 3 filled with cetyltrimethylammonium bromide solution 5 with a concentration of 0.8g / L, Disperse on the ultrasonic disperser 4 for 1 hour, make the carbon nanotube 10 after the purification positively charged after s...

Embodiment 2

[0025] Adopt spin electrophoresis screening diameter of the present invention to be the carbon nanotube of 20~30nm, its implementation process is, as figure 1 and figure 2 shown.

[0026] (1) Purification of carbon nanotubes: carbon nanotubes 10 with a diameter of 2-50nm and a length of 0.1-500μm are mixed with sulfuric acid with a concentration of 35% and nitric acid with a concentration of 65% at a volume ratio of 1:1 in the formed mixed acid solution, then heated the mixed acid solution to 95°C, acid-washed the carbon nanotubes 10 for 8 hours, cooled to room temperature, filtered and washed with deionized water, and vacuum-dried at 100°C for 2 hours;

[0027] (2) Surface modification of carbon nanotubes: add the purified carbon nanotubes 10 into the surface modification tank 3 filled with cetyltrimethylammonium bromide solution 5 with a concentration of 1.2g / L, Disperse on the ultrasonic disperser 4 for 2 hours, make the carbon nanotube 10 after the purification positive...

Embodiment 3

[0032] Adopt spin electrophoresis screening diameter of the present invention to be the carbon nanotube of 40~50nm, its implementation process is, as figure 1 and figure 2 shown.

[0033] (1) Purification of carbon nanotubes: carbon nanotubes 10 with a diameter of 2-50nm and a length of 0.1-500μm are mixed with sulfuric acid with a concentration of 50% and nitric acid with a concentration of 70% at a volume ratio of 1:1 In the formed mixed acid solution, then heat the mixed acid solution to 120°C, pickle the carbon nanotubes 10 for 10 hours, cool to room temperature, filter and wash with deionized water, and vacuum dry at 100°C for 3 hours;

[0034](2) Surface modification of carbon nanotubes: add the purified carbon nanotubes 10 into the surface modification tank 3 filled with cetyltrimethylammonium bromide solution 5 with a concentration of 1.5g / L, Disperse on the ultrasonic disperser 4 for 3 hours, make the carbon nanotube 10 after the purification positively charged aft...

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Abstract

The invention discloses a method for screening carbon nanotubes by spin electrophoresis, which is characterized in that the steps of the method are: (1) purifying the carbon nanotubes in a mixed solution of sulfuric acid and nitric acid; Surface modification of the purified carbon nanotubes in the surface modification tank of trimethylammonium bromide solution to make them positively charged and ultrasonically dispersed; (3) Slowly adjust the power supply voltage of the spin electrophoresis device; (4) Completely dissolve the permeable membrane with carbon nanotubes in a solvent mixed with phenol and glacial acetic acid; (5) replace the permeable membrane and repeat steps (3) and (4) until carbon nanotubes with different aspect ratios All filtered. Advantages of the present invention: effectively solve the problems of carbon nanotubes being easy to agglomerate, not easily dispersed, separated and difficult to screen, etc., can give full play to the unique properties of carbon nanotubes with uniform length-to-diameter ratio, and effectively improve the carbon nanotubes in composite materials. As the percentage content and uniform distribution of the reinforcing phase.

Description

technical field [0001] The invention relates to a method for screening carbon nanotubes by spin electrophoresis, belonging to the field of nanometer material science. Background technique [0002] Carbon nanotube is a one-dimensional quantum material with a special structure (the radial dimension is on the order of nanometers, and the axial dimension can reach the order of microns). It has a typical layered hollow structure. Its tube body is a quasi-circular tube. The structure is composed of hexagonal carbon ring structural units, and the end cap part is a polygonal structure composed of pentagonal and hexagonal carbon rings. Therefore, carbon nanotubes can be defined as seamless tubular substances rolled into graphene sheets. According to the number of graphene sheets that make up carbon nanotubes, carbon nanotubes can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes. . Due to their unique structure, carbon nanotubes exhibit excellent prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02B82Y30/00C01B32/168
Inventor 周圣丰戴晓琴
Owner NANCHANG HANGKONG UNIVERSITY
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