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A kind of elastic carbon airgel and its preparation method and application

A carbon aerogel and elasticity technology, which is applied in the field of elastic carbon aerogel and its preparation, can solve the problem of limiting the high compressibility of carbon materials, micro pressure and strain sensitivity, and increase the viscosity, compression degree and flexibility of graphene oxide dispersion. Insufficient and other problems, to achieve the effect of excellent cycle stability, wide sensing range, and prevention of stacking

Active Publication Date: 2021-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of polymers in the above method will increase the viscosity of the graphene oxide dispersion, making it difficult for graphene oxide to disperse well in aqueous solution, so the obtained carbon material has high density, insufficient compression and flexibility, which limits the high carbon material. Compressibility and sensitive response to small pressures and strains

Method used

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  • A kind of elastic carbon airgel and its preparation method and application
  • A kind of elastic carbon airgel and its preparation method and application
  • A kind of elastic carbon airgel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Disperse graphene oxide in a certain amount of water with a concentration of 0.1%, stir for 12 hours, and then carry out ultrasonic dispersion for 2 hours; carry out liquid nitrogen freezing and thawing and then ultrasonicate again for 0.5 hours; cycle freezing, thawing, ultrasonication for 2 hours times, a graphene oxide suspension was obtained.

[0037] (2) adding nano-microcrystalline cellulose equivalent to 4 times the quality of graphene oxide into the graphene oxide suspension obtained in step (1), ultrasonicating again for 0.5 hours; adding glucose equivalent to 2 times the quality of graphene oxide to obtain Graphene oxide / nanocrystalline cellulose suspension.

[0038] (3) Put the above-mentioned graphene oxide / nanocrystalline cellulose suspension in a plastic box, tie the box to the outer wall of the metal box, and pour liquid nitrogen into the metal box for freezing. After the solution is completely frozen, it is freeze-dried to prepare the graphene / nano-...

Embodiment 2

[0043] (1) Disperse graphene oxide in a certain amount of water with a concentration of 0.1%, stir for 24 hours, and then carry out ultrasonic dispersion for 1 hour; carry out liquid nitrogen freezing and thawing and then ultrasonication for 1 hour; cycle freezing, thawing, ultrasonication for 3 hours times, a graphene oxide suspension was obtained.

[0044] (2) adding nano-microcrystalline cellulose equivalent to 4 times the quality of graphene oxide into the graphene oxide suspension obtained in step (1), ultrasonicating again for 0.5 hour; adding glucose equivalent to 5 times the quality of graphene oxide to obtain Graphene oxide / nanocrystalline cellulose suspension.

[0045] (3) Put the above-mentioned graphene oxide / nanocrystalline cellulose suspension in a plastic box, tie the box to the outer wall of the metal box, and pour liquid nitrogen into the metal box for freezing. After the solution is completely frozen, it is freeze-dried to prepare the graphene / nano-microcrys...

Embodiment 3

[0049] (1) Disperse graphene oxide in a certain amount of water with a concentration of 0.1%, stir for 12 hours, and then carry out ultrasonic dispersion for 2 hours; carry out liquid nitrogen freezing and thawing and then ultrasonicate again for 0.5 hours; cycle freezing, thawing, ultrasonication for 2 hours times, a graphene oxide suspension was obtained.

[0050] (2) adding nano-microcrystalline cellulose equivalent to 4 times the quality of graphene oxide into the graphene oxide suspension obtained in step (1), ultrasonication for 0.5 hour again; adding urea equivalent to 2 times the quality of graphene oxide to obtain Graphene oxide / nanocrystalline cellulose suspension.

[0051] (3) Put the above-mentioned graphene oxide / nanocrystalline cellulose suspension in a plastic box, tie the box to the outer wall of the metal box, and pour liquid nitrogen into the metal box for freezing. After the solution is completely frozen, it is freeze-dried to prepare the graphene / nano-micr...

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Abstract

The invention belongs to the field of elastic carbon materials, and discloses an elastic carbon airgel, a preparation method and application thereof. Disperse graphene oxide in water, stir and ultrasonically disperse evenly, then perform liquid nitrogen freezing, thawing and ultrasonic treatment in sequence to obtain graphene oxide suspension; then add nano-microcrystalline cellulose, add small molecule carbon source or Nitrogen source to obtain graphene oxide / nano-microcrystalline cellulose suspension; liquid nitrogen freezing, then freeze-drying, and then heating up to 500-850° C. in an inert atmosphere and keeping it warm for 0-12 hours to obtain elastic carbon airgel. The present invention combines the advantages of graphene oxide and nano-microcrystalline cellulose, utilizes the dispersion, support and carbon connection of graphene oxide by nano-microcrystalline cellulose, and further combines the carbon connection of small molecule carbon sources or nitrogen sources to obtain Carbon airgel has the characteristics of low density, high compression, high resilience, and excellent recycling performance.

Description

technical field [0001] The invention belongs to the field of elastic carbon materials, and in particular relates to an elastic carbon airgel and its preparation method and application. Background technique [0002] The important role of elastic carbon materials in deformable devices depends on their compressive properties, elasticity, and fatigue resistance. The planar structure of two-dimensional carbon nanomaterials has unique advantages in the design of ultra-thin electrodes, flexible materials, and lightweight matrix materials. Graphene oxide and graphene, as representative materials in two-dimensional nano-carbon materials, have high electrical conductivity and certain flexibility, and can achieve large sizes in ultra-thin cases. extensive attention. At present, the methods for preparing elastic carbon materials from graphene or graphene oxide can be divided into sol-gel method and freeze casting method. Such as Hu et al. (Hu, H, et al.Ultralight and Highly Compressi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05G01L1/22G01L9/04G01B7/16
CPCG01B7/18G01L1/22G01L9/0002G01L9/04
Inventor 钟林新卓浩彭新文胡艺洁陈泽虹敬霜霜
Owner SOUTH CHINA UNIV OF TECH