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High-performance graphene/cellulose self-assembling composite hydrogel and aerogel and preparation method thereof

A composite hydrogel and cellulose technology, applied in the field of material science, can solve the problems of poor utilization of graphene and complex preparation process, etc., and achieve the effect of superior performance, simple preparation method, and superior material performance

Active Publication Date: 2015-11-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is more complicated
There are also methods to directly prepare cellulose / graphene composites by suction filtration or papermaking, but the self-assembly properties of graphene are not well utilized.

Method used

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  • High-performance graphene/cellulose self-assembling composite hydrogel and aerogel and preparation method thereof
  • High-performance graphene/cellulose self-assembling composite hydrogel and aerogel and preparation method thereof
  • High-performance graphene/cellulose self-assembling composite hydrogel and aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Take 20 g of coniferous wood pulp, add 4000 ml of ultrapure water, soak overnight, and then decompose to obtain a cellulose dispersion with a concentration of 5 mg / ml.

[0035] (2) The graphite oxide of 0.08g is added in the serum bottle that the cellulose dispersion in 8ml step (1) is housed, then add the water of 12ml, stir 15min, carry out ultrasonic dispersion with ultrasonic cleaner, its parameter condition is 100W ultrasound for one hour. Add 0.32g of vitamin C and react at 40°C for 10h. The cellulose fiber / graphene hydrogel is obtained, and then soaked in water for washing to obtain the final composite hydrogel, which is freeze-dried to composite aerogel.

Embodiment 2

[0037] (1) Take 20g of coniferous wood pulp, add 4000ml of ultra-pure water, soak overnight, and then decompose. A cellulose dispersion with a concentration of 5 mg / ml was obtained.

[0038] (2) The graphite oxide of 0.2g is added in the serum bottle that the cellulose dispersion in 80ml step (1) is housed, then adds the water of 20ml, stirs 15min, carries out ultrasonic dispersion with cell breaker, and its parameter condition is 600W ultrasonic crushing for 5min. Add 0.8g of vitamin C and react at 95°C for 10h. The cellulose fiber / graphene hydrogel is obtained, and then soaked in water for washing to obtain the final composite hydrogel, which is freeze-dried to composite aerogel.

Embodiment 3

[0040] (1) Take 10g of coniferous wood pulp, add 2000ml of ultrapure water, soak overnight, and then thaw out. A cellulose dispersion with a concentration of 5 mg / ml was obtained.

[0041] (2) Add 0.16g of graphite oxide to the beaker containing 32ml of the cellulose decomposing solution in step (1), then add 48ml of water, stir for 15min, and 100W ultrasonic for one hour. Add 0.8g of vitamin C and react at 95°C for 10h. The cellulose fiber / graphene hydrogel is obtained, and then soaked in water for washing to obtain the final composite hydrogel, which is freeze-dried to composite aerogel.

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Abstract

The invention belongs to the field of material science, and discloses a high-performance graphene / cellulose self-assembling composite hydrogel and aerogel and a preparation method thereof. The preparation method comprises the following steps: (1) firstly soaking cellulose raw materials, then carrying out defibering to prepare paper pulp dispersion liquid; (2) adding graphite oxide to the prepared paper pulp dispersion liquid, and carrying out ultrasonic dispersion to obtain a graphite oxide / cellulose mixed solution; and (3) adding a reducing agent into the graphite oxide / cellulose mixed solution, reducing for 3-24 h at the temperature of 40-100 DEG C, or adopting a hydrothermal reduction method, and washing the obtained product to obtain a graphene / cellulose self-assembling composite hydrogel; and then drying the composite hydrogel to obtain a composite aerogel. Through the simple method, the prepared composite gel is excellent in performance such as electrical conductivity and thermal stability particularly, and is wide in application.

Description

technical field [0001] The invention relates to a graphene / cellulose fiber self-assembled 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 appl...

Claims

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Application Information

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