Method for preparing hybrid film through graphene/nano crystalline cellulose dispersion liquid

A graphene dispersion, nanocrystalline cellulose technology, applied in the preparation of graphene/nanocrystalline cellulose hybrid film, the field of hybrid film preparation, can solve problems such as poor dispersibility, achieve strong hydrophilic performance, thermal The effect of strong stability and electrical conductivity, simple preparation method and process

Inactive Publication Date: 2013-10-23
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the prior art, the object of the present invention is to overcome the problem of poor dispersion of graphene when it is dispersed in a general solvent, and the graphene oxide is peeled off in a dispersant to form a lamellar structure through ultrasonic action, and then the nanocrystalline fiber The plain dispersion liquid is added to the graphene oxide dispersion liquid, and then a reducing agent is added to form a uniformly dispersed and stable graphene / nanocrystalline cellulose dispersion liquid under the action of ultrasound, and then prepared by spin coating or spray coating or casting film. Graphene / nanocrystalline cellulose hybrid film, in order to achieve the above object, the technical solution of the present invention is:

Method used

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Examples

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Effect test

preparation example Construction

[0017] A kind of preparation method of graphene / nanocrystalline cellulose hybrid film, described preparation method comprises the following steps:

[0018] a Graphite pre-oxidation: Take 30ml of concentrated sulfuric acid and add it to a 500ml three-necked flask, then weigh 5g of potassium persulfate and slowly add it to the concentrated sulfuric acid, then add 5g of phosphorus pentoxide, raise the temperature to 80°C, and then add 3g of Graphite powder was reacted for 6 hours. After the reaction was completed, it was filtered and washed until no sulfate ions were detected, and then dried in a vacuum oven at 60°C for 3 hours to obtain pre-oxidized graphene. Secondary oxidation of preoxidized graphene: measure 200ml of concentrated sulfuric acid and add it to a 500ml three-necked flask, place it in an ice bath at 0°C, slowly add preoxidized graphene, and then slowly add 30g of potassium permanganate , raise the temperature to 35°C for 3h, then raise the temperature to 95°C and ...

Embodiment 1

[0027]a Graphite pre-oxidation: Take 30ml of concentrated sulfuric acid and add it to a 500ml three-necked flask, then weigh 5g of potassium persulfate and slowly add it to the concentrated sulfuric acid, then add 5g of phosphorus pentoxide, raise the temperature to 80°C, and then add 3g of Graphite powder was reacted for 6 hours. After the reaction was completed, it was filtered and washed until no sulfate ions were detected, and then dried in a vacuum oven at 60°C for 3 hours to obtain pre-oxidized graphene. Secondary oxidation of preoxidized graphene: measure 200ml of concentrated sulfuric acid and add it to a 500ml three-necked flask, place it in an ice bath at 0°C, slowly add preoxidized graphene, and then slowly add 30g of potassium permanganate , raise the temperature to 35°C for 3h, then raise the temperature to 95°C and stir for 15min, then add the reaction solution and transfer it to a 1000ml beaker, then add 600ml of deionized water, then add 6ml of 30% hydrogen pero...

Embodiment 2

[0033] a Graphite pre-oxidation: Take 30ml of concentrated sulfuric acid and add it to a 500ml three-necked flask, then weigh 5g of potassium persulfate and slowly add it to the concentrated sulfuric acid, then add 5g of phosphorus pentoxide, raise the temperature to 80°C, and then add 3g of Graphite powder was reacted for 6 hours. After the reaction was completed, it was filtered and washed until no sulfate ions were detected, and then dried in a vacuum oven at 60°C for 3 hours to obtain pre-oxidized graphene. Secondary oxidation of preoxidized graphene: measure 200ml of concentrated sulfuric acid and add it to a 500ml three-necked flask, place it in an ice bath at 0°C, slowly add preoxidized graphene, and then slowly add 30g of potassium permanganate , raise the temperature to 35°C for 3h, then raise the temperature to 95°C and stir for 15min, then add the reaction solution and transfer it to a 1000ml beaker, then add 600ml of deionized water, then add 6ml of 30% hydrogen per...

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Abstract

The invention relates to a method for preparing hybrid film through graphene / nano crystalline cellulose dispersion liquid. The preparation method comprises the following steps: respectively dispersing oxidized graphene obtained by oxidation treatment and nano crystalline cellulose in a dispersing agent, and then, gradually dripping nano crystalline cellulose dispersion liquid into oxidized graphene dispersion liquid to obtain graphene / nano crystalline cellulose dispersion liquid, adding a reducing agent under ultrasonic or mechanical stirring condition to reduce the oxidized graphene, inserting the crystalline cellulose between graphene pieces to prevent aggregation between the graphene layers and to form uniformly dispersed and stable graphene / nano crystalline cellulose dispersion liquid, and then, preparing a graphene / nano crystalline cellulose hybrid film through such methods as spin coating, spray coating, film casting, and the like. The prepared hybrid film has high uniformity, and the higher the content of the graphene in the hybrid film, the stronger the thermal stability and conductivity of the hybrid film are; the higher the content of nano crystalline cellulose in the hybrid film is, the smaller the contact angle of the hybrid film is, and the stronger the hydrophilicity is.

Description

technical field [0001] The invention relates to a preparation method of a hybrid film, in particular to a preparation method of a graphene / nanocrystalline cellulose hybrid film, and belongs to the technical field of material preparation. Background technique [0002] Graphene is a carbonaceous material composed of two-dimensional honeycomb carbon atom crystals closely packed by a single layer of carbon atoms. Since its discovery in 2004, it has attracted the attention of researchers in the fields of physics and materials. Its basic structural unit is a stable six-membered ring, and this special structure gives it many excellent properties. For example, its theoretical specific surface area is as high as 2600m 2 / g, the thermal conductivity reaches 5000Wm -1 K -1 , high electron mobility (15000cm / (V.s)) at room temperature, and a series of physical properties such as special quantum Hall effect and quantum tunneling effect. Due to the special properties of graphene, it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/02C08K3/04C08J3/02
Inventor 王罗新任杰汪志王娟王桦吴静
Owner WUHAN TEXTILE UNIV
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