Carbon nanotube surface modification method

A technology of carbon nanotubes and surface modification, applied in the direction of carbon nanotubes, nanocarbons, chemical instruments and methods, etc., can solve problems such as broken tube walls, defects, and difficult disposal of waste liquid, and achieve stable dispersion and improved compatibility , the effect of simple operation

Active Publication Date: 2018-12-21
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are some defects in the commonly used carbon nanotube surface modification method: the use of covalent modification such as mixed acid will cause the carbon nanotube to bend, kink, break and produce defects on the tube wall, which will reduce the performance of the carbon nanotube At the same time, a large amount of strong acid and strong alkali are used, which makes it difficult to treat the waste liquid after treatment, and the polluting gas generated during the reaction will cause great harm to the environment
While using a single non-covalent modification method, although it will not damage the structure of carbon nanotubes and has less pollution, its dispersion effect is worse than that of covalent modification.

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Experimental program
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Effect test

Embodiment 1

[0033] (1) the first step purification treatment of carbon nanotubes: 10ml concentration is that the ferrous sulfate solution of 1mol / L is mixed with the hydrogen peroxide solution of 30wt% with 12ml concentration, obtains the hydrogen peroxide solution containing ferrous sulfate catalyst, Adjust pH=2; put 0.1g of untreated carbon nanotubes into a hydrogen peroxide solution containing ferrous sulfate catalyst, react under ultrasonic vibration conditions for 4 hours, centrifuge to separate carbon nanotubes, and use deionized water to filter Wash until neutral, then dry in a vacuum oven;

[0034] (2) Carry out the second step of purification treatment on the carbon nanotubes treated in step (1): place 0.1 g of the treated carbon nanotubes in a muffle furnace for 3 hours and roast in an air atmosphere, and the roasting temperature is 400° C.;

[0035] (3) Coating the carbon nanotubes treated in step (2) with polydopamine: the tris of 0.788g and 14.7ml of concentration are mixed e...

Embodiment 2

[0038] (1) The first step purification treatment of carbon nanotubes: the ferrous sulfate solution that is 0.5mol / L is mixed with the hydrogen peroxide solution that 10ml concentration is 30wt% by 8ml concentration, obtains the hydrogen peroxide solution that contains ferrous sulfate catalyst , adjust the pH=4; put 0.1g of untreated carbon nanotubes into the hydrogen peroxide solution containing ferrous sulfate catalyst, react for 5 hours under the condition of ultrasonic vibration, centrifuge the carbon nanotubes, use deionized water to pump Filter and wash until neutral, then dry in a vacuum oven;

[0039] (2) Carrying out the second step of purification treatment on the carbon nanotubes treated in step (1): placing 0.1 g of the treated carbon nanotubes in a muffle furnace for 2 hours of roasting, the atmosphere is air atmosphere, and the roasting temperature is 350° C.;

[0040] (3) Coating the carbon nanotubes treated in step (2) with polydopamine: the tris of 0.788g and 1...

Embodiment 3

[0043] (1) The first step purification treatment of carbon nanotubes: 12ml concentration is that the ferrous sulfate solution of 1.5mol / L is mixed with the hydrogen peroxide solution of 20wt% with 8ml concentration, obtains the hydrogen peroxide solution containing ferrous sulfate catalyst , adjust the pH=3; put 0.1g of untreated carbon nanotubes into the hydrogen peroxide solution containing ferrous sulfate catalyst, react for 4 hours under the condition of ultrasonic vibration, centrifuge the carbon nanotubes, use deionized water to pump Filter and wash until neutral, then dry in a vacuum oven;

[0044] (2) Carry out the second step of purification treatment on the carbon nanotubes treated in step (1): place 0.1 g of the treated carbon nanotubes in a muffle furnace and roast for 1 hour, the atmosphere is an air atmosphere, and the roasting temperature is 450° C.;

[0045] (3) Coating the carbon nanotubes treated in step (2) with polydopamine: the tris of 0.788g and 16.7ml of...

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Abstract

The invention belongs to the field of fine chemical industry, and relates to a carbon nanotube surface modification method. The carbon nanotube surface modification method comprises the following steps: (1) purifying an untreated carbon nanotube by utilizing a fenton reagent; (2) roasting the carbon nanotube treated in step (1) at a high temperature to further complete the purification; (3) covering the surface of the carbon nanotube treated in step (2) by utilizing poly-dopamine; and (4) modifying the carbon nanotube treated in step (3) by virtue of a coupling agent. By adopting the carbon nanotube surface modification method, the surface of the carbon nanotube is covered with the poly-dopamine, and the outer surface of the poly-dopamine is provided with the coupling agent, so that the carbon nanotubes can be stably dispersed in water or an organic solvent. Compared with the prior art, on the basis of not damaging the structure of the carbon nanotube, the dispersion performance is improved; and moreover, the carbon nanotube surface modification method has the advantages of simplicity in operation, no use of toxic reagent, no pollution, good dispersion effect and the like. The method is also suitable for a single-wall carbon nanotube and a multi-wall carbon nanotube.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a method for modifying the surface of carbon nanotubes. Background technique [0002] Both theoretical and experimental studies have shown that carbon nanotubes have extremely high tensile modulus and tensile strength. The fracture strength of CNTs is reported to be as high as 200 GPa, and the elastic modulus is in the range of 1 TPa. Carbon nanotubes have twice the thermal conductivity of diamond and 1,000 times the current carrying capacity of copper wire. Therefore, carbon nanotubes have great potential as reinforcing agents for polymer matrices. However, the dispersion of carbon nanotubes in the polymer matrix has been a key issue hindering its high performance. Surface treatment of carbon nanotubes is an important method to improve their dispersion. At present, in addition to physical methods such as ultrasonic, plasma, and ball milling, the commonly used chemical mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168C01B32/17
CPCC01B32/168C01B32/17
Inventor 丁永红郭亮杨景红
Owner CHANGZHOU UNIV
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