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A kind of ultra-light graphene/multi-wall carbon nanotube composite wave absorbing foam and preparation method thereof

A technology of multi-walled carbon nanotubes and graphene, which is applied in the fields of carbon compounds, chemical instruments and methods, ceramic products, etc., can solve the problems of limited aerogel volume, uncontrollable shape, complex aerogel process, etc. , to achieve the effect of short process flow, excellent absorbing performance and controllable shape

Active Publication Date: 2021-05-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the airgel process prepared by the hydrothermal method is relatively complicated. The volume of the airgel is limited by the size of the container, and its shrinkage relative to the container is serious, and the shape is difficult to control. Further processing is required for application.
For example: Chinese patents CN110272719A and CN109573988A respectively announced several carbon-based composite airgel materials, but their shapes cannot be artificially controlled

Method used

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  • A kind of ultra-light graphene/multi-wall carbon nanotube composite wave absorbing foam and preparation method thereof
  • A kind of ultra-light graphene/multi-wall carbon nanotube composite wave absorbing foam and preparation method thereof
  • A kind of ultra-light graphene/multi-wall carbon nanotube composite wave absorbing foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Take 421mg of graphene oxide, 84.2mg of carboxylated multi-walled carbon nanotubes and 72.2mL of deionized water and mix them. After ultrasonic treatment at 500W for 30min, stir magnetically for 1h. After stirring, add 5.6mL of absolute ethanol.

[0047] 2) Put the suspension obtained in step 1) into an environment with a vacuum degree of 0.04 MPa and let it stand for 10 minutes.

[0048] 3) Put the polished copper block whose length, width and height are 200*200*50mm into a low-temperature refrigerator to freeze until the temperature is -85°C, take out the copper block and put it in an environment with a room temperature of 20°C, and place the inner diameter on it A quartz dish with a size of 190*190*10mm, a wall thickness of 2mm, and rounded corners of φ=1mm is used, and the suspension in step 2) is poured into the quartz dish, and wait for about 6 minutes until the suspension is solidified.

[0049] 4) Put the quartz dish in step 3) together with the solidified su...

Embodiment 2

[0053] 1) Take 421mg of graphene oxide, 84.2mg of carboxylated multi-walled carbon nanotubes and 72.2mL of deionized water and mix them. After ultrasonic treatment at 500W for 30min, stir magnetically for 1h. After stirring, add 2.8mL of absolute ethanol.

[0054] 2) Put the suspension obtained in step 1) into an environment with a vacuum degree of 0.04 MPa and let it stand for 10 minutes.

[0055] 3) Put the polished copper block whose length, width and height are 200*200*50mm into a low-temperature refrigerator to freeze until the temperature is -85°C, take out the copper block and put it in an environment with a room temperature of 20°C, and place the inner diameter on it A quartz dish with a size of 190*190*10mm, a wall thickness of 2mm, and rounded corners of φ=1mm is used, and the suspension in step 2) is poured into the quartz dish, and wait for about 6 minutes until the suspension is solidified.

[0056] 4) Put the quartz dish in step 3) together with the solidified su...

Embodiment 3

[0060] 1) Take 842mg of graphene oxide, 168.4mg of carboxylated multi-walled carbon nanotubes and 144.4mL of deionized water and mix them. After ultrasonic treatment at 500W for 30min, stir magnetically for 1h. After stirring, add 5.6mL of absolute ethanol.

[0061] 2) Put the suspension obtained in step 1) into an environment with a vacuum degree of 0.04 MPa and let it stand for 10 minutes.

[0062] 3) Put the polished copper block whose length, width and height are 200*200*50mm into a low-temperature refrigerator to freeze until the temperature is -85°C, take out the copper block and put it in an environment with a room temperature of 20°C, and place the inner diameter on it A quartz dish with a size of 190*190*10mm, a wall thickness of 2mm, and rounded corners of φ=1mm is used, and the suspension in step 2) is poured into the quartz dish, and wait for about 18 minutes until the suspension is solidified.

[0063] 4) Put the quartz dish in step 3) together with the solidified...

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Abstract

The invention discloses an ultra-light graphene / multi-wall carbon nanotube composite wave-absorbing foam and a preparation method thereof. Ultrasonic dispersion of raw materials such as graphene oxide and carboxylated multi-walled carbon nanotubes into water, adding alcohol solvent and stirring evenly, and then placed in a vacuum environment for static treatment, followed by orientation freezing, freeze drying and thermal reduction treatment , to obtain graphene / multi-walled carbon nanotube composite wave-absorbing foam. The composite wave-absorbing foam has a directional pore structure inside, and the shape and internal average inner diameter of the composite wave-absorbing foam are controllable, and the density is as low as 0.002-1.2g / cm 3 , has electromagnetic wave absorption effect in 2-40GHz, and has excellent absorbing performance lower than ‑8dB, ‑10dB, ‑17dB in X, Ku, Ka frequency bands, and graphene / multi-walled carbon nanotube composite absorbing foam can be combined with Plastic polymer materials are further compounded to improve mechanical properties. The preparation process of syntactic foam is simple, low in cost, and can be produced on a large scale.

Description

technical field [0001] The invention relates to a foam absorbing material, in particular to an ultra-light graphene / multi-walled carbon nanotube composite wave-absorbing foam material which is ultra-light, has a directional pore structure, and has a wide effective absorption bandwidth, and also relates to its utilization The invention relates to a method for preparing ultra-light graphene / multi-walled carbon nanotube composite wave-absorbing foam by combining freeze-drying technology with orientation freezing, and belongs to the technical field of wave-absorbing materials. Background technique [0002] The close combination of rapidly iterative communication technology, artificial intelligence and big data has transformed the communication between people and people, and between people and equipment, into the Internet of Everything. However, with the rapid development and widespread application of contemporary communication technologies such as 5G mobile communication technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194C01B32/168C04B30/02C04B38/02C04B26/32H05K9/00
CPCC04B26/32C04B30/02C04B2111/00008C04B2111/00844C04B2201/20H05K9/0081C04B14/024C04B14/026C04B38/08C04B38/0067C04B24/282C04B24/281
Inventor 杜作娟张乾诚黄小忠陈爱良侯明明
Owner CENT SOUTH UNIV
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