Graphene aerogel and hybrid composite material thereof as well as preparation method and application of graphene aerogel

A graphene airgel, graphene technology, applied in the field of airgel

Active Publication Date: 2017-02-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Have not yet seen the report that adopts vacuum drying to prepare graphene airgel, only a few documents adopt normal pressure drying [L.Liu, J.Yang, Q.H.Meng, Journal of Sol-gel Science and Technology.2013,66,1]

Method used

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  • Graphene aerogel and hybrid composite material thereof as well as preparation method and application of graphene aerogel
  • Graphene aerogel and hybrid composite material thereof as well as preparation method and application of graphene aerogel
  • Graphene aerogel and hybrid composite material thereof as well as preparation method and application of graphene aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Embodiment 1, prepare graphene airgel:

[0085] 1) Add 75mg of acrylamide, 3.3mg of N,N-methylenebisacrylamide, 0.6 mg potassium persulfate and 150 mg ascorbic acid were stirred at 10°C for 60 min to obtain a mixed solution;

[0086] 2) Heat the mixed solution in an oil bath at 70°C for 20 minutes to obtain a partially reduced graphene oxide / polyacrylamide hydrogel;

[0087] 3) Pre-freeze the partially reduced graphene / polyacrylamide hydrogel at -75°C for 30 minutes, and after melting at room temperature, heat the gel in an oil bath at 80°C for 18 hours to obtain graphene / polyacrylamide hydrogel gel;

[0088] 4) Put the graphene / polyacrylamide hydrogel in a dialysis bag with a molecular weight cut-off of 16,000, then place the dialysis bag in deionized water for replacement, replace the deionized water regularly, and obtain graphene hydrogel after 2 days of dialysis. glue;

[0089]5) Graphene hydrogel is directly freeze-dried to obtain graphene airgel, the freezing ...

Embodiment 2

[0110] Embodiment 2, prepare graphene airgel:

[0111] 1) Add 37.5 mg of acrylamide, 1.6 mg of N,N-methylenebisacrylamide, 0.3mg potassium persulfate and 150mg ascorbic acid were stirred at 20°C for 60min to obtain a mixed solution;

[0112] 2) Heat the mixed solution in an oil bath at 90°C for 10 minutes to obtain a partially reduced graphene oxide / polyacrylamide hydrogel;

[0113] 3) The partially reduced graphene oxide / polyacrylamide hydrogel was pre-frozen in liquid nitrogen for 10 minutes, and after melting at room temperature, the gel was heated in an oil bath at 70°C for 24 hours to obtain graphene / polyacrylamide hydrogel gel;

[0114] 4) Dialyzing the graphene / polyacrylamide hydrogel in deionized water for 2 days to obtain a graphene hydrogel;

[0115] 5) Graphene hydrogel is directly freeze-dried to obtain graphene aerogel. The freezing temperature is -75°C, the freezing time is 30min, the drying temperature is -15-30°C, the drying temperature rises from -15°C to ...

Embodiment 3

[0122] Embodiment 3, prepare graphene airgel:

[0123] 1) Add 375 mg of acrylamide, 16.5 mg of N,N-methylenebisacrylamide, 3.0 mg of graphene oxide solution (wherein the molar ratio of carbon to oxygen in graphene oxide is 2) in 10 ml, 7.5 mg / ml of graphene oxide solution mg potassium persulfate and 150 mg ascorbic acid were stirred at 20°C for 60 min to obtain a mixed solution;

[0124]2) Heat the mixed solution in an oil bath at 100°C for 3 minutes to obtain a partially reduced graphene oxide / polyacrylamide hydrogel;

[0125] 3) Pre-freeze the reduced graphene oxide / polyacrylamide hydrogel at -50°C for 60 minutes, and after melting at room temperature, heat the gel in an oil bath at 100°C for 8 hours to obtain graphene / polyacrylamide hydrogel gel;

[0126] 4) Dialyzing the graphene / polyacrylamide hydrogel in deionized water for 2 days to obtain a graphene hydrogel;

[0127] 5) Graphene hydrogel is directly freeze-dried to obtain graphene aerogel. The freezing temperature...

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Abstract

The invention discloses graphene aerogel and a hybrid composite material thereof as well as a preparation method and application of the of graphene aerogel. The preparation method comprises the following steps: 1) mixing graphene oxide, a reducing agent, acrylamide, N,N-methylene-bisacrylamide and potassium persulfate and reacting to obtain partially-reduced graphene/polyacrylamide hydrogel; 2) carrying out pre-freezing and reduction on the partially-reduced graphene/polyacrylamide hydrogel in sequence to obtain graphene/polyacrylamide hydrogel; 3) dialyzing and drying the graphene/polyacrylamide hydrogel in sequence to obtain the graphene aerogel. The graphene aerogel has the characteristics of uniform cellular structure and light weight, excellent resilience, relatively high mechanical strength and good solvent resistance; a preparation process is simple, rapid and low in cost; the graphene aerogel can also be used for preparing polymer/graphene composite aerogel, nanoparticle/graphene composite aerogel and polymer/graphene composite materials and the like, so that application of the graphene aerogel is expanded.

Description

technical field [0001] The invention belongs to the technical field of airgel, and in particular relates to a graphene airgel and its hybrid composite material as well as its preparation method and application. Background technique [0002] Graphene is a two-dimensional sheet material composed of a single layer of carbon atoms, which has excellent mechanical, electrical and thermal properties. At present, the preparation methods of graphene mainly include: mechanical exfoliation method, chemical vapor deposition method, crystal surface epitaxial growth method and redox method. Among them, the redox method is the most likely method for the industrial production of graphene. The cheap graphite is oxidized and exfoliated into graphene oxide by the Hummers method, and the graphene oxide dispersion is self-assembled into a three-dimensional graphene network through chemical or thermal reduction, and then further dried to obtain graphene airgel. Graphene airgel can be used in ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C08L83/04C08L75/04C08L7/00C08L63/00C08L47/00C08L1/02C08L67/04C08L25/06C08L23/06C08K7/24C08K3/04
Inventor 刘琛阳李晨蔚张宝庆鹿浩
Owner INST OF CHEM CHINESE ACAD OF SCI
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