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Graphene aerogel, preparation method and applications thereof

A graphene aerogel, graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the random structure and performance of graphene aerogel, hinder the application of graphene, and inhibit graphene sheets and other problems, to achieve the effects of excellent anisotropic properties, preventing leakage of molten phase change materials, and excellent mechanical properties

Active Publication Date: 2017-11-03
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the graphene airgel prepared by these methods can exhibit the unique physical and chemical properties of graphene, the graphene airgel skeleton is a disordered three-dimensional porous network, the structure and properties are isotropic, and the graphene sheet The random overlapping and stacking of layers severely inhibits the full display of the unique physical and chemical properties of graphene sheets, making the structure and properties of the obtained graphene airgel random and unable to be finely adjusted, thereby hindering the use of graphene in energy storage and conversion. , gas phase catalysis, environmental cleaning, sensing, composite materials and other fields

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  • Graphene aerogel, preparation method and applications thereof
  • Graphene aerogel, preparation method and applications thereof
  • Graphene aerogel, preparation method and applications thereof

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[0050] The embodiment of the present invention also provides the preparation method of the aforementioned graphene airgel. In a typical embodiment, the preparation method includes: using graphene oxide liquid crystal as the gel precursor, and uniformly distributing the crosslinking agent by gas phase diffusion Introduce it into the liquid crystal system, let the gel stand still, then cover the wet gel with the reducing agent solution, let it stand still for reduction, then replace the solvent with ethanol or acetone, and finally undergo supercritical drying to obtain an anisotropic structure and performance Graphene airgel.

[0051] A kind of preparation method of graphene airgel provided by the embodiment of the present invention comprises the following steps:

[0052] (1) Provide graphene oxide liquid crystal;

[0053] (2) performing an orientation treatment on the graphene oxide liquid crystal to obtain a long-range ordered graphene oxide liquid crystal;

[0054] (3) addi...

Embodiment 1

[0097] (1) Preparation of graphene oxide liquid crystals: disperse 3 g of graphene oxide (derived from graphite powder with a particle size of 1 μm by the improved Hummers method) in 2 L of neutral aqueous solution, ultrasonically disperse for 3 h, and then undergo 1500 r Centrifuge at 10,000 r / min for 15 min, collect the supernatant, and then centrifuge the supernatant at 10,000 r / min for 3 h to obtain graphene oxide liquid crystals with rich schlieren texture.

[0098] (2) Long-range ordering of graphene oxide: 3 mL of graphene oxide liquid crystal with a concentration of about 7 mg / mL was placed in a cylindrical syringe, and flow orientation was carried out for 5 min by repeatedly pushing and pulling the syringe plunger (2-5 mm / s).

[0099] (3) Gelation of graphene oxide liquid crystals: the graphene oxide liquid crystals in the syringe were exposed to hydrogen fluoride gas atmosphere, and left at room temperature for 12 hours to obtain graphene oxide hydrogels with liquid c...

Embodiment 2

[0105] (1) Preparation of graphene oxide liquid crystals: disperse 3 g of graphene oxide (derived from graphite powder with a particle size of 1 μm by the improved Hummers method) in 2 L of neutral aqueous solution, ultrasonically disperse for 3 h, and then undergo 4000 r / min centrifugation for 10 minutes, the supernatant was collected, and then the supernatant was centrifuged at 8000r / min for 6 hours at a high speed to obtain graphene oxide liquid crystals with rich schlieren texture.

[0106] (2) Long-range ordering of graphene oxide: 10 mL of graphene oxide liquid crystal with a concentration of about 10 mg / mL was placed in a rectangular petri dish, and the rectangular petri dish was tilted left and right (10-15°) for 5 minutes of flow orientation.

[0107] (3) Gelation of graphene oxide liquid crystals: the graphene oxide liquid crystals in a petri dish were exposed to hydrogen bromide atmosphere, and left at room temperature for 24 hours to obtain graphene oxide hydrogels...

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Abstract

The invention discloses a graphene aerogel, a preparation method and applications thereof. The graphene aerogel comprises an anisotropic, regular and ordered three-dimensional porous network structure comprising graphene sheet layers, and a nanometer porous structure comprising micropores, mesopores and macropores, wherein the micropores and the mesopores are mainly distributed in the pore wall of the regular and ordered macropores. The preparation method comprises: introducing a cross-linking agent into a liquid crystal system through gas phase diffusion by using a graphene oxide liquid crystal as a precursor, introducing a reduction agent through ion diffusion to obtain a graphene hydrogel, and drying to obtain the graphene aerogel. According to the present invention, the graphene aerogel has anisotropic thermal, electrical and mechanical properties, and the preparation method has characteristics of simple preparation process, mild reaction condition, low energy consumption, no pollution and wide application prospect, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a graphene airgel, in particular to an anisotropic graphene airgel and a preparation method and application thereof, belonging to the technical field of nanoporous materials. Background technique [0002] Graphene is based on sp 2 The honeycomb crystal structure formed by the closely arranged hybridized carbon atoms is only the thickness of one carbon atom layer (0.34nm), which is the thinnest material found so far. Graphene can be imagined as an atomic grid formed by carbon atoms and their covalent bonds. The preparation method of graphene has gradually expanded from the initial tape tearing method / slight friction method to various other methods, such as epitaxial growth, CVD growth, redox method, etc. The structure of graphene is very stable, the carbon-carbon bond is only The connection between carbon atoms inside graphene has a certain degree of flexibility. When an external force is applied to graphene, the surface of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/182C09K5/06
CPCC01B2204/22C01B2204/24C01B2204/26C01B2204/32C01P2002/72C01P2002/82C01P2004/03C01P2006/10C01P2006/16C01P2006/17C09K5/063
Inventor 张学同李广勇
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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