Graphene-based aerogel material with strong and tough structure and preparation method thereof

A graphene-based, aerogel technology, applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of easy collapse, complicated process, poor chemical stability of cellulose airgel, etc., and achieve mechanical Enhanced strength, good electrical conductivity, and good cycle stability

Active Publication Date: 2019-02-15
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method introduces the preparation of a nano-cellulose aerogel, which solves the problem that the cellulose aerogel is not easy to disperse uniformly in an organic solvent, and prepares an organic aerogel with good performance
However, the chemical stability of cellulose airgel is poor, and it is not resistant to corrosion, so the application field of cellulose airgel is greatly limited.
At the same time, the sol-gel method is generally used in the preparation process of cellulose airgel. The chemical reaction in the sol-gel method is the key to the formation of the airgel network structure. The structure of the glue is difficult to control and easy to collapse, so the preparation of cellulose aerogels also has great limitations
[0011] To sum up, there is no reported graphene airgel material with both strong structure and good electrical properties.

Method used

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  • Graphene-based aerogel material with strong and tough structure and preparation method thereof
  • Graphene-based aerogel material with strong and tough structure and preparation method thereof
  • Graphene-based aerogel material with strong and tough structure and preparation method thereof

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Embodiment 1

[0065] This embodiment discloses a method for preparing a graphene-based aerogel material with a strong and tough structure, and the specific process is as follows:

[0066] 1) Preparation of graphene oxide solution: using natural graphite powder, concentrated sulfuric acid, potassium persulfate, phosphorus pentoxide, potassium permanganate as raw materials, graphene oxide is prepared by an improved Hummers method, and uniformly dispersed in deionized water. Graphene oxide aqueous solution with a concentration of 5 mg / mL.

[0067] 2) Preparation of nanofiber suspension: the thermoplastic PVA-co-PE masterbatch and cellulose acetate butyrate (CAB) powder are mixed according to a certain mass and then melted and extruded to obtain PVA-co-PE nanofiber fibrils. The PVA-co-PE nanofiber suspension is placed in an alcohol-water system, and a uniformly dispersed milky white PVA-co-PE nanofiber dispersion with a concentration of 20 mg / mL is prepared by the strong shear action of a stirrer.

...

Embodiment 2

[0071] This embodiment discloses a method for preparing a graphene-based aerogel material with a strong and tough structure, and the specific process is as follows:

[0072] 1) Preparation of graphene oxide solution: using natural graphite powder, concentrated sulfuric acid, potassium persulfate, phosphorus pentoxide, potassium permanganate as raw materials, graphene oxide is prepared by an improved Hummers method, and uniformly dispersed in deionized water. Graphene oxide aqueous solution with a concentration of 5 mg / mL.

[0073] 2) Preparation of nanofiber suspension: the thermoplastic PVA-co-PE masterbatch and cellulose acetate butyrate (CAB) powder are mixed according to a certain mass and then melted and extruded to obtain PVA-co-PE nanofiber fibrils. The PVA-co-PE nanofiber suspension is placed in an alcohol-water system, and a uniformly dispersed milky white PVA-co-PE nanofiber dispersion with a concentration of 20 mg / mL is prepared by the strong shear action of a stirrer.

...

Embodiment 3

[0077] This embodiment discloses a method for preparing a graphene-based aerogel material with a strong and tough structure, and the specific process is as follows:

[0078] 1) Preparation of graphene oxide solution: using natural graphite powder, concentrated sulfuric acid, potassium persulfate, phosphorus pentoxide, potassium permanganate as raw materials, graphene oxide is prepared by an improved Hummers method, and uniformly dispersed in deionized water. Graphene oxide aqueous solution with a concentration of 5 mg / mL.

[0079] 2) Preparation of nanofiber suspension: the thermoplastic PVA-co-PE masterbatch and cellulose acetate butyrate (CAB) powder are mixed according to a certain mass and then melted and extruded to obtain PVA-co-PE nanofiber fibrils. The PVA-co-PE nanofiber suspension is placed in an alcohol-water system, and a uniformly dispersed milky white PVA-co-PE nanofiber dispersion with a concentration of 20 mg / mL is prepared by the strong shear action of a stirrer.

...

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Abstract

The invention discloses a graphene-based aerogel material with a strong and tough structure and a preparation method thereof. Through introducing polymer nano-fibers and a PVA cross-linking agent in agraphene sheet layer, the graphene-based aerogel of a novel framework-beam column-adhesive three-dimensional channel structure is finally prepared; the polymer nano-fibers for supporting the graphenesheet layer are arranged in a three-dimensional channel in an oriented manner; the flexibility and the toughness of the polymer nano-fibers endow the graphene-based aerogel with excellent compressionresilience, so that tens of thousands of compression cycles can be borne, and the defect that pure graphene aerogel has a weak structure is effectively overcome. Moreover, the graphene-based aerogelnot only has good mechanical properties, but also maintains good electrical properties, therefore, the graphene-based aerogel can be applied to a high-sensitivity and fine pressure sensor and has relatively great application potential in the frontier fields such as artificial intelligence, wearable equipment and the like.

Description

Technical field [0001] The invention relates to a graphene aerogel material, belonging to the technical field of new materials, and in particular to a graphene-based aerogel material with a strong and tough structure and a preparation method thereof. Background technique [0002] Graphene is a kind of sp 2 The two-dimensional monolayer nano-carbon material of hexagonal honeycomb lattice composed of hybrid orbitals has many unique physical and chemical properties. Aerogel is a nanoporous solid material with a three-dimensional network cross-linked structure with ultra-low density, ultra-high specific surface area and porosity. Graphene aerogel integrates the excellent mechanical, electrical and thermal properties of graphene, and also has the three-dimensional porous structural characteristics of aerogel. It realizes the assembly of graphene from two-dimensional nanostructures to three-dimensional macrostructures. , Adsorption and sensing fields have huge application potential. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 刘琼珍王栋贺晓伟陈佳慧孙灯明刘轲王雯雯李沐芳王跃丹鲁振坦蒋海青
Owner WUHAN TEXTILE UNIV
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