A method for preparing graphene airgel by drying under normal pressure

A graphene aerogel, graphene hydrogel technology, applied in the directions of graphene, nano-carbon, etc., can solve problems such as large differences in performance of aerogels, and achieve the effects of low cost, industrialized production, and simple process

Active Publication Date: 2018-05-15
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this patent, graphene is only used as a crosslinking agent, not the main material of airgel, and its performance is quite different from that of graphene airgel.

Method used

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  • A method for preparing graphene airgel by drying under normal pressure
  • A method for preparing graphene airgel by drying under normal pressure
  • A method for preparing graphene airgel by drying under normal pressure

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Use 325 mesh flake graphite as raw material, prepare graphene oxide by improved Hummer's chemical method, obtain the graphene oxide (GO) solution of 10 mg per milliliter, get 5 milliliters of GO solution and join in the cylindrical glass bottle, add 5 milliliters to go Ionized water, adjust the concentration of GO solution to 5 mg / ml, then take 100 microliters of hydrazine hydrate solution with a mass fraction of 35%, add it to the GO solution, and ultrasonicate for 5 minutes to disperse the hydrazine hydrate evenly. Seal it with a stopper, and react at 95 degrees Celsius for 0.5 hour to form a gel. Then stop the reaction. After the gel drops to room temperature, put the gel in the refrigerator to freeze. The temperature of the refrigerator is about -18 degrees Celsius. Two hours later, after the gel is completely frozen, take the gel to room temperature , after completely thawing, freeze and thaw again under the same conditions, and then place the hydrogel at 95 degree...

Embodiment 2

[0047] The process flow is the same as in Example 1, except that the concentration of the GO solution is adjusted to 4 mg / ml, the total amount is 10 ml, 80 microliters of hydrazine hydrate is added, and the reaction time is 1 hour. After the gel is formed, the freezing temperature is -30 degrees Celsius. After freezing and thawing, react for another 1.5 hours.

Embodiment 3

[0049] The process flow is the same as in Example 1, except that the concentration of the GO solution is adjusted to 3 mg / ml, the total amount is 10 ml, and the amount of hydrazine hydrate added is 90 microliters.

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Abstract

The invention provides a method for preparing graphene aerogel by normal pressure drying. The method firstly uses an aqueous dispersion of graphene oxide as a raw material to prepare a hydrogel, and then undergoes freezing and thawing treatment to reassemble its internal structure. The formed structure is sufficient to resist the structure collapse caused by the gas-liquid interfacial tension during atmospheric drying, and finally the graphene aerogel is prepared by atmospheric drying. Compared with freeze drying and supercritical drying methods, the present invention greatly improves the preparation efficiency of graphene aerogel, reduces production cost, and is expected to realize industrialized production of graphene aerogel. In addition, the present invention provides a new graphene aerogel whose macroporous and super-resilient properties will be applied in many fields.

Description

【Technical field】 [0001] The invention relates to a method for preparing graphene airgel by drying under normal pressure, and belongs to the technical field of airgel preparation. 【Background technique】 [0002] Aerogel, also known as xerogel, is a nanomaterial with a multi-branched nanoporous three-dimensional network structure with extremely low density, high specific surface area, extremely high porosity and ultra-high pore volume ratio. The medium filled in is gas, and the appearance is solid. The emergence of carbon aerogels is a pioneering progress in the research of airgel materials, which extends airgel materials from poor electrical conductors to electrical conductors, and opens up new application fields for airgel materials. [0003] Graphene is composed of sp2 hybridized carbon atoms, which has a periodic honeycomb lattice structure and has good electrical, thermal, mechanical and other physical properties. The thickness of graphene is only about 0.34 nanometers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184
Inventor 张建明杨洪生段咏欣张晓方
Owner QINGDAO UNIV OF SCI & TECH
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