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Graphene aerogel film as well as preparation method and application thereof

A graphene airgel, airgel technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the limitation of airgel materials, airgel phase change composite materials, widely used applications, airgel The mechanical properties of films or fibers are reduced, and they do not have mechanical strength and flexibility, so as to achieve good application prospects, synthesis and mechanical flexibility enhancement, and good flexibility.

Pending Publication Date: 2022-07-01
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, aerogels have high porosity, do not have high mechanical strength and excellent flexibility, especially when the aerogels are designed to be thinner or thinner and other low-dimensional designs, the mechanical properties of the obtained airgel films or fibers The performance will be further reduced; the phase change material has typical rigidity and brittleness in the solid state, and is fluid in the molten state, and does not have any mechanical strength and flexibility
Therefore, when the airgel is combined with the phase change material, the resulting airgel phase change material is often brittle, weak in mechanical strength, and does not have good flexibility.
Such a defect in mechanical properties severely limits the wide application of airgel materials, phase change materials and airgel phase change composite materials and their application in emerging technology fields.
[0007] In view of the poor mechanical properties of traditional aerogels, the brittleness, rigidity and fluidity of phase change materials, and the mechanical flexibility and high strength of airgel phase change films, it is urgent to propose a high-strength and flexible air-condensation Adhesive films, phase-change smart films and simple preparation methods push the structure, performance and application of airgel and composite materials to a new level

Method used

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  • Graphene aerogel film as well as preparation method and application thereof
  • Graphene aerogel film as well as preparation method and application thereof
  • Graphene aerogel film as well as preparation method and application thereof

Examples

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preparation example Construction

[0067] Another aspect of the embodiments of the present invention also provides a method for preparing a graphene aerogel film, which includes: synthesizing and forging of graphene aerogel fiber aggregates.

[0068] Further, the preparation method includes: providing graphene aerogel fiber aggregates; and forging the graphene aerogel fiber aggregates.

[0069] As one of the preferred solutions, the preparation method specifically includes:

[0070] Arranging graphene aerogel fibers to form graphene aerogel fiber aggregates;

[0071] The graphene aerogel fiber aggregate is subjected to forging treatment to realize the densification and reorganization of the internal porous network of the graphene aerogel fiber and the adhesion between the graphene aerogel fibers to obtain a flexible and high-strength densified fiber. Graphene aerogel films.

[0072] As one of the preferred solutions, the preparation method includes: arranging the graphene aerogel fibers by at least any one or...

Embodiment 1

[0095] (a) Provision of graphene aerogel fiber aggregates: Graphene aerogel fibers with a diameter of 10 μm and their uniaxial aggregates were obtained by a combined process of programmed wet spinning-ascorbic acid chemical reduction-freeze drying .

[0096] (b) forging the graphene aerogel fiber aggregates in step (a) at a temperature of 25° C. and a pressure of 1 MPa for 1 min for 5 times to obtain a densified graphene aerogel film.

[0097] (c) Immerse the densified graphene aerogel film in step (b) in molten paraffin, and let it stand for 3 hours to obtain a flexible graphene aerogel phase-change smart film.

[0098] Figure 1-4 Radial and axial scanning electron microscope (SEM) photos of the graphene aerogel film obtained in this example, the three-dimensional porous network structure includes a layered structure formed by stacking graphene aerogel fibers, a film structure and a Sequential honeycomb-like pore structure, see Table 1 for structure and performance paramet...

Embodiment 2

[0100] (a) Providing graphene aerogel fiber aggregates: Graphene aerogel fibers with a diameter of 500 μm and the same were obtained by a combined process of programmed wet spinning-ascorbic acid / hydroiodic acid combined chemical reduction-freeze drying Uniaxial aggregates.

[0101] (b) Forging the graphene aerogel fiber aggregates in step (a) at a temperature of -50° C. and a pressure of 0.1 MPa for 10 min, forging times once, to obtain a densified graphene aerogel film .

[0102] (c) Immerse the densified graphene aerogel film in step (b) in molten paraffin, and let it stand for 3 hours to obtain a flexible graphene aerogel phase-change smart film.

[0103] Image 6 For the axial scanning electron microscope (SEM) photo of the graphene aerogel film obtained in this example, please refer to Table 1 for the structure and performance parameters.

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Abstract

The invention discloses a graphene aerogel film as well as a preparation method and application thereof. The graphene aerogel thin film has a densified and anisotropic three-dimensional porous network structure, and comprises a layered structure, a film structure and an ordered honeycomb pore structure which are formed by densified stacking of graphene aerogel fibers, and the graphene aerogel fibers are obtained by ordered lap joint and assembly of graphene sheet layers. The preparation method comprises the following steps: arranging graphene aerogel fibers to form a graphene aerogel fiber aggregate, and then forging the graphene aerogel fiber aggregate to realize densification recombination of a porous network in the graphene aerogel fibers and adhesion among the graphene aerogel fibers so as to obtain the graphene aerogel film. The graphene aerogel thin film can be used for preparing the flexible graphene aerogel phase change intelligent thin film, integration of functions of heat energy modulation, intelligent heating, heat energy conversion and storage and the like is achieved, and the preparation process is simple, mild in reaction condition, low in cost, green and free of pollution.

Description

technical field [0001] The invention relates to a graphene aerogel film, a preparation method and application thereof, and belongs to the fields of energy materials and nanotechnology. Background technique [0002] Aerogel is a low-density solid material with a continuous three-dimensional porous network structure in which the dispersion medium is gas. Since 1932, American chemist Samuel Stephens Kistler used supercritical fluid drying technology to prepare "solid smoke" - silica aerogel for the first time, aerogel as a new member of material family has attracted people's attention and research. With the development of nearly a century, a series of aerogels with different materials, structures and properties have been synthesized successively, such as silica aerogels, metal oxide aerogels (TiO 2 , Al 2 O 3 , ZrO 2 etc.), metal aerogels (such as gold), polymer aerogels (polyaniline, polypyrrole, polyimide, etc.), carbon aerogels and new nano-carbon aerogels (graphene, car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/182C01B32/194C09K5/06
CPCC01B32/182C01B32/194C09K5/063C01B2204/20C01B2204/32C01B2204/24C01B2204/22C01B2204/26
Inventor 张学同李广勇
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI