High-performance graphene/cellulose composite hydrogel and aerogel and preparation methods thereof

A composite hydrogel and composite aerogel technology, applied in the field of material science, can solve the problems of limiting the application of graphene, easy agglomeration and difficult dispersion of graphene, and achieve excellent mechanical properties, good thermal stability, and prevent agglomeration. Effect

Inactive Publication Date: 2014-07-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of van der Waals force, graphene is very easy to agglomerate and difficult to disperse.
This greatly limits the application of graphene

Method used

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  • High-performance graphene/cellulose composite hydrogel and aerogel and preparation methods thereof
  • High-performance graphene/cellulose composite hydrogel and aerogel and preparation methods thereof
  • High-performance graphene/cellulose composite hydrogel and aerogel and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Add 15g of ionic liquid into a 25ml three-necked flask, and heat the oil bath to 80°C. When the ionic liquid was completely dissolved, 0.45 g of graphite oxide (prepared by the improved Hummers method) was added, the mixture was stirred for 0.5 h, and then the three-neck flask was transferred into a cell disruptor and ultrasonicated for 10 min. Then 1.8 g of ascorbic acid was added, and the mixture was stirred at 80° C. for 24 h. A reduced graphene oxide ionic liquid solution with a graphene oxide concentration of 2.6 wt% was obtained.

[0040] (2) Add 20g of ionic liquid into a 50ml three-neck flask, and heat the oil bath to 80°C. When the ionic liquid was completely dissolved, 1.2 g of softwood pulp (after ball milling) was added under magnetic stirring, and nitrogen gas was passed (5 min). Then stir at 80°C until the cellulose is completely dissolved. A cellulose ionic liquid solution with a cellulose mass fraction of 6% was obtained.

[0041] (3) Add 0.23 g ...

Embodiment 2

[0043] (1) Add 15g of ionic liquid into a 25ml three-necked flask, and heat the oil bath to 110°C. When the ionic liquid was completely dissolved, 0.45 g of graphite oxide was added, the mixture was stirred for 0.5 h, and then the three-neck flask was transferred to an ultrasonic cleaner, 100 W, 60 ° C for 3 h. Then 1.8 g of ascorbic acid was added, and the mixture was stirred at 80° C. for 24 h. A reduced graphene oxide ionic liquid solution with a graphene oxide concentration of 2.6 wt% was obtained.

[0044](2) 24g of ionic liquid was added into a 50ml three-neck flask, and the oil bath was heated to 110°C. When the ionic liquid was completely dissolved, 1.2 g of cellulose was added under magnetic stirring, and nitrogen gas was passed (5 min). Then stir at 110°C until the cellulose is completely dissolved.

[0045] (3) Add 0.046 g of the reduced graphene oxide ionic liquid solution in (1) to the cellulose solution in (2), and stir the mixture at 110° C. for 30 min. Tran...

Embodiment 3

[0049] (1) Add 15g of ionic liquid into a 25ml three-necked flask, and heat the oil bath to 110°C. When the ionic liquid was completely dissolved, 0.3 g of graphite oxide was added, the mixture was stirred for 0.5 h, and then the three-neck flask was transferred to an ultrasonic cleaner, 80 W, 60 ° C for 4 h. Then 1.2 g of ascorbic acid was added, and the mixture was stirred at 80° C. for 24 h. A reduced graphene oxide ionic liquid solution with a graphene oxide concentration of 2.6 wt% was obtained.

[0050] (2) 24g of ionic liquid was added into a 50ml three-neck flask, and the oil bath was heated to 110°C. When the ionic liquid was completely dissolved, 1.2 g of cellulose was added under magnetic stirring, and nitrogen gas was passed (5 min). Then stir at 110°C until the cellulose is completely dissolved.

[0051] (3) Add 0.66 g of the reduced graphene oxide ionic liquid solution in (1) to the cellulose solution in (2), and stir the mixture at 110° C. for 30 min. Transf...

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Abstract

The invention belongs to the field of the material science and in particular relates to a high-performance graphene/cellulose composite hydrogel and aerogel and preparation methods thereof. The preparation method of the high-performance graphene/cellulose composite hydrogel comprises the following steps: (1) adding graphite oxide to ionic liquid and ultrasonically dispersing to obtain an ionic liquid solution of the graphite oxide; preparing an ionic liquid solution of cellulose having the mass fraction of 4-6wt%; (2) adding a reducing agent to the ionic liquid solution of graphite oxide, and reducing at 80-100 DEG C for 2-24 hours, thereby obtaining an ionic liquid mixed solution of reduced graphite oxide; (3) mixing the ionic liquid mixed solution of reduced graphite oxide with the ionic liquid solution of cellulose; (4) defoaming the obtained final mixed solution, regenerating by use of a coagulating bath, and washing, thus obtaining the graphene/cellulose composite hydrogel. The composite gel prepared by the preparation method has excellent properties, particularly has excellent the mechanical properties, and can be widely applied.

Description

technical field [0001] The invention relates to a graphene / cellulose composite hydrogel and aerogel and a preparation method thereof, belonging to the field of material science. Background technique [0002] Graphene is a honeycomb hexagonal planar crystal arranged in sp2 hybridized carbon atoms, a new type of carbon nanomaterial with a thickness of only a single layer of atoms. Research shows that the specific surface area of ​​graphene can be as high as 2600m 2 / g, the Young's modulus is about 1100Gpa, the fracture strength is 125Gpa, the mechanical strength is 1060Gpa, the thermal conductivity is 5000W / m.K, and it has excellent electron transport ability. Since its discovery, graphene has aroused great interest in the scientific community. , becoming one of the most popular "star materials" for research. However, due to the existence of van der Waals force, graphene is very easy to agglomerate and difficult to disperse. This greatly limits the application of graphene. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/00C08L1/02C08K9/04C08K9/00C08K3/04
Inventor 王小慧徐曼曼孙润仓黄权波
Owner SOUTH CHINA UNIV OF TECH
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