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Method for preparing graphene aerogel through constant pressure drying

A technology of graphene airgel and graphene hydrogel, which is applied in the field of drying and preparing graphene aerogels under normal pressure, can solve the problems of large differences in performance aerogels, and achieve low cost, good mechanical properties and electrical conductivity The effect of simple performance and process

Active Publication Date: 2015-09-23
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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  • Method for preparing graphene aerogel through constant pressure drying
  • Method for preparing graphene aerogel through constant pressure drying
  • Method for preparing graphene aerogel through constant pressure drying

Examples

Experimental program
Comparison scheme
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 a graphene aerogel through constant pressure drying. The method comprises the following steps of: firstly, preparing a hydrogel by using aqueous dispersions of oxidized graphene as raw materials; processing the hydrogel by freezing and melting so as to reassemble the internal structure of the hydrogel, wherein the formed structure is strong enough to resist the structure collapse caused by air-liquid interface tension during constant pressure drying; and finally, realizing the preparation of the graphene aerogel through constant pressure drying. Compared with a freeze drying method and a supercritical drying method, the method disclosed by the invention has the advantages that the efficiency for preparing the graphene aerogel is greatly improved, the production cost is reduced, and the industrialized production of the graphene aerogel is hopeful to realize. In addition, the invention further provides a novel graphene aerogel, and the characteristics of macropores and super resilience, of the graphene aerogel, can 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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IPC IPC(8): C01B31/04
Inventor 张建明杨洪生段咏欣张晓方
Owner QINGDAO UNIV OF SCI & TECH
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