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A preparation method of graphene airgel with adjustable pore size

A graphene airgel and graphene technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve problems such as unsatisfactory, limited performance, and improvement, and achieve high mechanical properties, thermal and electrical conductivity, and high The effects of directional adsorption performance and high compression recovery performance

Active Publication Date: 2020-05-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation methods of graphene aerogels have great shortcomings, and the performance improvement of graphene aerogels is limited due to the inability to precisely control the morphology of graphene aerogels.
Among the commonly used preparation methods, the hydrothermal method combines self-assembly and reduction processes to assemble graphene sheets into three-dimensional structures [1,2], but cannot prepare highly ordered porous structures with tunable pore sizes.
Graphene airgel with high thermal conductivity can be prepared by chemical deposition [3,4], but its morphology is limited by the morphology of the deposition substrate, which limits the application of this method
The ice template method regulates the morphology of graphene aerogels through the nucleation and growth of ice crystals[5,6]. appearance
On the other hand, the ultra-low density and porous structure lead to poor mechanical properties of graphene aerogels
Conventional strengthening methods either greatly increase the density of aerogels [7], or change the chemical properties of aerogels [8], which will reduce the performance advantages of graphene aerogels and cannot meet the existing needs

Method used

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  • A preparation method of graphene airgel with adjustable pore size
  • A preparation method of graphene airgel with adjustable pore size

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Effect test

Embodiment 1

[0030] A method for preparing graphene aerogels with high electrical and thermal conductivity and high mechanical properties using specific freezing equipment, comprising the steps of:

[0031] (1) To prepare graphene oxide suspension, take 3g of graphite flakes and add 1.5g of sodium nitrate, add 90ml of concentrated sulfuric acid in an ice bath, stir for 4h, slowly add 9g of potassium permanganate, and stir at 30°C for 24h; slowly add 200ml of deionized water at 40°C, after cooling to room temperature, slowly add 10ml of hydrogen peroxide dropwise and stir for 15min; add 30ml of concentrated hydrochloric acid and let it stand for more than 12h, drain the supernatant, repeat this process twice, and the remaining dark yellow The suspension is transferred into a dialysis bag for dialysis until the pH value is greater than 6. This process lasts for more than 4 days. The unoxidized graphite is removed by centrifugal dispersion at a speed of 8000-10000rpm for many times, and the su...

Embodiment 2

[0039] A method for preparing graphene aerogels with high electrical and thermal conductivity and high mechanical properties using specific freezing equipment, comprising the steps of:

[0040] (1) To prepare graphene oxide suspension, take 3g of graphite flakes and add 1.5g of sodium nitrate, add 90ml of concentrated sulfuric acid in an ice bath, stir for 4h, slowly add 9g of potassium permanganate, and stir at 30°C for 24h; slowly add 200ml of deionized water at 40°C, after cooling to room temperature, slowly add 10ml of hydrogen peroxide dropwise and stir for 15min; add 30ml of concentrated hydrochloric acid and let it stand for more than 12h, drain the supernatant, repeat this process twice, and the remaining dark yellow The suspension is transferred into a dialysis bag for dialysis until the pH value is greater than 6. This process lasts for more than 4 days. The unoxidized graphite is removed by centrifugal dispersion at a speed of 8000-10000rpm for many times, and the supe...

Embodiment 3

[0048] A method for preparing graphene aerogels with high electrical and thermal conductivity and high mechanical properties using specific freezing equipment, comprising the steps of:

[0049] (1) To prepare graphene oxide suspension, take 3g of graphite flakes and add 1.5g of sodium nitrate, add 90ml of concentrated sulfuric acid in an ice bath, stir for 4h, slowly add 9g of potassium permanganate, and stir at 30°C for 24h; slowly add 200ml of deionized water at 40°C, after cooling to room temperature, slowly add 10ml of hydrogen peroxide dropwise and stir for 15min; add 30ml of concentrated hydrochloric acid and let it stand for more than 12h, drain the supernatant, repeat this process twice, and the remaining dark yellow The suspension is transferred into a dialysis bag for dialysis until the pH value is greater than 6. This process lasts for more than 4 days. The unoxidized graphite is removed by centrifugal dispersion at a speed of 8000-10000rpm for many times, and the su...

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Abstract

Provided is a preparing method of aperture-adjustable graphene aerogel. The graphene aerogel is prepared from graphene oxide through a reduction freezing method and has the advantages that the aperture adjustable range is 5-240 micron, the highest elasticity modulus is 327 kPa, and organic solvents can be absorbed. A freezing device used in the freezing step is composed of a cooling system and a temperature measuring system, the reduction freezing temperature interval is -10 DEG C to -196 DEG C, and the temperature is lowered by 0.2-20 DEG C every second. Ice crystals are used as the templatefor precisely adjusting the appearance of the aerogel, and the graphene aerogel with different apertures is obtained. The small-aperture graphene aerogel prepared under the high-speed freezing condition has extremely high mechanical performance and heat conduction and electric conduction performance and can be used in the catalysis and battery fields. The large-aperture graphene aerogel prepared under the low-speed freezing condition has extremely high oriented adsorption performance and can be used for sewage treatment. The superlarge-aperture graphene aerogel prepared under the superlow-speed freezing condition has extremely high compression and resilience performance and can be used for a pressure sensor.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a preparation method of graphene airgel with adjustable pore size. [0002] technical background [0003] Graphene, as a new type of two-dimensional carbon material, has attracted extensive attention due to its excellent physical properties and high specific surface area. Making graphene into porous airgel bulk materials can further broaden its application fields. Combining the ultra-low density of airgel and the excellent physical properties of graphene, graphene airgel has performance advantages in the fields of catalysis, electrochemistry, sewage treatment, and sensing. [0004] At present, the preparation methods of graphene aerogels have major deficiencies, and the performance improvement of graphene aerogels is limited due to the inability to precisely control the morphology of graphene aerogels. Among the commonly used preparation methods, the hydrothermal method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B32/194
CPCC01B32/184C01B32/194
Inventor 张海龙朱翔宇朱丽娜王西涛
Owner UNIV OF SCI & TECH BEIJING
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