Magnetic carbon nanotube and preparation method thereof

A technology of magnetic carbon nanotubes and carbon nanotubes, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of reducing interface binding, dispersion and orientation, separation of polymers and magnetic particles, and magnetic plating Complicated particle technology and other issues, to achieve the effect of excellent orientation controllability, low cost, and strong binding force

Active Publication Date: 2014-07-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method of physically entangling carbon nanotubes with polymers and then plating magnetic particles has the following disadvantages: First, the physical entangling of polymers is weaker than chemical bonding, which can easily lead to the detachment of polymers and magnetic particles from the surface of carbon nanotubes, thereby reducing the interface of carbon nanotubes. Combination, dispersibility and orientation; secondly, the polymer is loaded on the surface of carbon nanotubes by physical winding method, and the amount of grafting is not controllable; in addition, a two-step method is used to coat magnetic particles on the surface of modified carbon nanotubes Complex process and high cost

Method used

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  • Magnetic carbon nanotube and preparation method thereof
  • Magnetic carbon nanotube and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] step 1

[0027] Take 1ml of anhydrous acetic acid and 49ml of ethanol and mix them evenly as a solvent, add 1ml of silane coupling agent KH550, and then add 2g of hydroxylated carbon nanotubes with a diameter of 10-20nm and a length of 1-10μm. After ultrasonic dispersion for 30 minutes to mix the solution uniformly, the reaction was carried out at 50° C. for 24 hours. After the reaction was complete, the solution was taken out and centrifuged in a centrifuge. The rotation speed is 4000r / min, and the separation is performed 3 times, each time for 30 minutes, and the washing solution added is absolute ethanol. After the separation is completed, further suction filtration, the filter membrane pore size is 220nm, the added washing liquid is absolute ethanol, suction filtration 3 times. After the suction filtration is completed, vacuum-dry at room temperature for 24 hours in a vacuum drying oven to obtain dry functionalized carbon nanotubes.

[0028] step 2

[0029] Take...

Embodiment 2

[0039] step 1

[0040] Take 2ml of anhydrous acetic acid and 98ml of ethanol and mix them evenly as a solvent, add 1ml of silane coupling agent KH560, and then add 1g of carboxylated carbon nanotubes with a diameter of 30-40nm and a length of 1-10μm. After ultrasonic dispersion for 30 minutes to mix the solution uniformly, the reaction was carried out at 50° C. for 24 hours. After the reaction was complete, the solution was taken out and centrifuged in a centrifuge. The rotation speed is 4000r / min, and the separation is performed 3 times, each time for 30 minutes, and the washing solution added is absolute ethanol. After the separation is completed, further suction filtration, the filter membrane pore size is 220nm, the added washing liquid is absolute ethanol, suction filtration 3 times. After the suction filtration is completed, vacuum-dry at room temperature for 24 hours in a vacuum drying oven to obtain dry functionalized carbon nanotubes.

[0041] step 2

[0042] Take...

Embodiment 3

[0052] step 1

[0053] Take 1ml of anhydrous acetic acid and 49ml of ethanol and mix them uniformly as a solvent, add 2ml of dimethylformamide, and then add 1g of carboxylated carbon nanotubes with a diameter of 50-80nm and a tube length of 1-20μm. After ultrasonic dispersion for 30 minutes to mix the solution uniformly, the reaction was carried out at 50° C. for 24 hours. After the reaction was complete, the solution was taken out and centrifuged in a centrifuge. The rotation speed is 4000r / min, and the separation is performed 3 times, each time for 30 minutes, and the washing solution added is absolute ethanol. After the separation is completed, further suction filtration, the filter membrane pore size is 220nm, the added washing liquid is absolute ethanol, suction filtration 3 times. After the suction filtration is completed, vacuum-dry at room temperature for 24 hours in a vacuum drying oven to obtain dry functionalized carbon nanotubes.

[0054] step 2

[0055] Take 1...

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Abstract

The invention particularly relates to a magnetic carbon nanotube and a preparation method thereof, belonging to the technical field of preparing an organic / inorganic nanocomposite material. The preparation method comprises the following steps: (1) grafting a functionalized functional group on the surface of the carbon nanotube by using a chemical synthesis method; (2) grafting high-molecular polymer onto the surface of the functionalized carbon nanotube so as to be evenly coated by adopting a chemical polymerization method; (3) evenly plating magnetic particles on the surface of the modified carbon nanotube by utilizing a chemical plating method; and (4) putting the modified carbon nanotube in a magnetic field so as to be orientally arranged. The method has the advantages of being mild in preparation conditions, simple and convenient and the like, and the prepared carbon nanotube has stronger magnetism and high orientation degree, and can be added into a polymer-based composite material.

Description

technical field [0001] The invention belongs to the technical field of preparation of organic / inorganic nano composite materials, in particular to a magnetic carbon nanotube and a preparation method thereof. Background technique [0002] Due to the special structure of nanoscale diameter and high aspect ratio, carbon nanotubes have excellent mechanical properties and outstanding electrical properties, and are widely used in various fields. However, due to the high specific surface area of ​​carbon nanotubes and the strong van der Waals attraction between carbon nanotubes, it is easy to reunite into a dense network, which is difficult to be separated by external mechanical effects, which makes carbon nanotubes in organic Dispersion in solvent or polymer is very inhomogeneous. Meanwhile, carbon nanotubes are poorly bonded to polymer interfaces due to their special graphene structure. In addition, carbon nanotubes are arranged randomly in polymers and organic solvents, and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00C23C18/32C08F292/00C08F220/14C08F220/32C08F212/08C01B32/168
Inventor 贾晓龙李武胜杨小平徐先娟杨光
Owner BEIJING UNIV OF CHEM TECH
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