Method for preparing isotropic superelastic graphene aerogel

A graphene airgel, isotropic technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of complex preparation process, and achieve the effect of simple process and uniform distribution of pore size

Active Publication Date: 2017-03-22
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent with the application number CN105600777A uses sodium dodecylsulfonate as a foaming agent, and uses the bubbles generated by its stirring as a template to prepare a styrene-modified graphene foam, but the invention is first frozen with liquid nitrogen and then Freeze drying, the preparation process is too complicated

Method used

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  • Method for preparing isotropic superelastic graphene aerogel
  • Method for preparing isotropic superelastic graphene aerogel
  • Method for preparing isotropic superelastic graphene aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare 3mg·ml -1 aqueous dispersion of graphene oxide. Take 6ml of the above-mentioned graphene oxide aqueous dispersion and place it in a cylindrical bottle, add 0.5ml of 50mg·ml -1 SDS and 36mg of vitamin C, 300r·min -1 Stir for 3min, then 1000r·min -1 Stir magnetically for 2 minutes, put it in an 80°C blast drying oven for 45 minutes, take it out and cool it to room temperature, put it in a low-temperature environment of -20°C for 3 hours, melt it at room temperature, and then wash it with ethanol for 3 times. The hydrogel was dried in a blast oven at 60°C for 24 hours to obtain a graphene aerogel with good shape retention. Its average pore diameter is 490 μm, and the pore thickness is about 100 nm.

Embodiment 2

[0049] The kind of material used and technological process are the same as embodiment 1, the difference is that the concentration of graphene oxide is 4mg·ml -1 , the dosage of vitamin C is 48mg. Finally, a honeycomb graphene airgel with good shape retention is obtained, and its internal pores are still relatively large with an average pore diameter of 420 μm.

Embodiment 3

[0051] The kind of material used and technological process are the same as embodiment 1, the difference is that the concentration of graphene oxide is 5mg·ml -1 , the dosage of vitamin C is 60mg. A graphene airgel with good shape retention was obtained, and its internal pore size was relatively uniform, with an average pore diameter of 300 μm. Its wall thickness is 120 nm.

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Abstract

The invention provides a method for preparing isotropic superelastic graphene gasgel. The method comprises the following steps: firstly, stirring and mixing an oxidized graphene aqueous dispersion, a reducing agent and sodium dodecyl sulfate (SDS) at low speed, and then stirring at high speed; heating, freezing, melting at room temperature, washing with ethanol and drying at atmospheric pressure to obtain the isotropic superelastic graphene aerogel. The method provided by the invention has the advantages of simple process and is suitable for industrial production, and the obtained graphene aerogel is isotropic, has uniform cell size, and has excellent compression recovery and good electrochemical performance.

Description

[0001] 【Technical field】 [0002] The invention relates to a method for preparing an isotropic superelastic graphene airgel, which belongs to the technical field of new material preparation and also belongs to the technical field of airgel preparation. [0003] 【Background technique】 [0004] Graphene airgel is obtained by physical or chemical cross-linking of graphene sheets. It has the dual characteristics of airgel and graphene: ultra-light, porous, conductive, hydrophobic and lipophilic, and has good compression resilience. These properties make graphene airgel ideal for catalyst carriers, conductive devices, and oil pollution treatment It has great potential application value in energy buffering. [0005] The preparation of graphene aerogels from graphene oxide provides the possibility for large-scale production of graphene aerogels, and the template method is widely used in its preparation process. Compared with other organic substances as templates, the ice template met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/20C01B2204/26C01P2004/03C01P2006/16C01P2006/17
Inventor 张建明张晓方段咏欣
Owner QINGDAO UNIV OF SCI & TECH
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