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Preparing method of aperture-adjustable graphene aerogel

A technology of graphene airgel and graphene hydrogel, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as unsatisfactory, limited performance, limited popularization and application, etc., and achieve high mechanical properties and Effects of thermal and electrical conductivity, high compression recovery performance, and high directional adsorption performance

Active Publication Date: 2019-01-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 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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  • Preparing method of aperture-adjustable graphene aerogel

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Embodiment 1

[0029] A method for preparing graphene aerogels with high electrical conductivity, thermal conductivity and high mechanical properties by using specific refrigeration equipment, including the following steps:

[0030] (1) Prepare graphene oxide suspension, take 3g graphite flakes and add 1.5g sodium nitrate, add 90ml concentrated sulfuric acid in an ice bath, stir for 4h, slowly add 9g potassium permanganate, and stir at 30℃ for 24h; add slowly; 200ml of 40℃ deionized water, 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, this process is repeated twice, the remaining dark yellow The suspension is transferred to a dialysis bag for dialysis until the PH value is greater than 6, and the process lasts for more than 4 days. The unoxidized graphite is removed by centrifugation at 8000-10000rpm for several times. The supernatant is tak...

Embodiment 2

[0038] A method for preparing graphene aerogels with high electrical conductivity, thermal conductivity and high mechanical properties by using specific refrigeration equipment, including the following steps:

[0039] (1) Prepare graphene oxide suspension, take 3g graphite flakes and add 1.5g sodium nitrate, add 90ml concentrated sulfuric acid in ice bath, stir for 4h, slowly add 9g potassium permanganate, and stir at 30℃ for 24h; add slowly; 200ml of 40℃ deionized water, after cooling to room temperature, slowly add 10ml of hydrogen peroxide dropwise and stir for 15min; add 30ml of concentrated hydrochloric acid and let stand for more than 12h, drain the supernatant, this process is repeated twice, the remaining dark yellow The suspension is transferred to a dialysis bag for dialysis until the PH value is greater than 6, and the process lasts for more than 4 days. The unoxidized graphite is removed by centrifugation at 8000-10000rpm for several times. The supernatant is taken out...

Embodiment 3

[0047] A method for preparing graphene aerogels with high electrical conductivity, thermal conductivity and high mechanical properties by using specific refrigeration equipment, including the following steps:

[0048] (1) Prepare graphene oxide suspension, take 3g graphite flakes and add 1.5g sodium nitrate, add 90ml concentrated sulfuric acid in an ice bath, stir for 4h, slowly add 9g potassium permanganate, and stir at 30℃ for 24h; add slowly; 200ml of 40℃ deionized water, after cooling to room temperature, slowly add 10ml of hydrogen peroxide dropwise and stir for 15min; add 30ml of concentrated hydrochloric acid and let stand for more than 12h, drain the supernatant, this process is repeated twice, the remaining dark yellow The suspension is transferred to a dialysis bag for dialysis until the PH value is greater than 6, and the process lasts for more than 4 days. The unoxidized graphite is removed by centrifugation at 8000-10000rpm for several times. The supernatant is taken ...

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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, and in particular relates to a method for preparing graphene aerogel with adjustable pore size. technical background [0002] As a new type of two-dimensional carbon material, graphene has received extensive attention due to its excellent physical properties and extremely high specific surface area. Making graphene into a porous aerogel block material can further broaden its application fields. Graphene aerogel combines the ultra-low density of aerogel with the excellent physical properties of graphene, and has performance advantages in the fields of catalysis, electrochemistry, sewage treatment, and sensing. [0003] At present, the preparation method of graphene aerogel has major shortcomings, and the improvement of its performance is limited due to the inability to precisely control the morphology of graphene aerogel. In the commonly used preparation methods, the hydrothermal method combin...

Claims

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Application Information

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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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