Preparation method of modified graphene aqueous dispersion

A graphene and dispersion technology, applied in the field of preparation of high-stability modified graphene aqueous dispersion, can solve the problems of limited application, easy agglomeration, difficult dispersion, etc., and achieve the effects of high yield and good stability

Inactive Publication Date: 2014-12-17
山东利特纳米技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high specific surface area of ​​graphene, there is van der Waals force between graphene material layers, so it is easy to agglomerate; Dispersed in various solvents, greatly limiting its application
[0003] In the prior art, water-soluble graphene is usually prepared by exfoliating graphite in an aqueous solution of polyvinylpyrrolidone, or by ultrasonically treating graphite powder, and using non-ionic hydrophilic polymers in an aqueous solution of polyvinylpyrrolidone Steric hindrance and vacancy stabilization effect to obtain water-soluble single-layer graphene, and then to obtain high-quality graphene dispersion liquid, but the yield of single-layer graphene obtained by these methods is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Take 1g of natural graphite, strong oxidant potassium permanganate, 10ml of 98% concentrated sulfuric acid, control the reaction temperature of the solution below 40 degrees, stir and react for 3 hours, and obtain graphene oxide slurry;

[0021] (2) Take 1g of the above-mentioned graphene oxide slurry, and wash it with water until neutral;

[0022] (3) Dry the graphene oxide slurry cleaned to neutral to obtain graphene oxide, and prepare 100 mL of graphene oxide aqueous solution with a concentration of 0.005 g / mL;

[0023] (4) Add 0.1 g of polyvinylpyrrolidone to the graphene oxide aqueous solution;

[0024] (5) Magnetic stirring, mixing evenly;

[0025] (6) Then add 1.0g ascorbic acid, under the condition of magnetic stirring, react in an oil bath, control the reaction temperature to 90 degrees, and react for 3 hours;

[0026] (7) After the reaction is finished, filter with suction to obtain polyvinylpyrrolidone-modified graphene;

[0027] (8) The modified graph...

Embodiment 2

[0030] (1) Take 1g of natural graphite, 1g of strong oxidant potassium permanganate, 10ml of 98% concentrated sulfuric acid, control the reaction temperature of the solution below 30 degrees, stir and react for 3 hours, and obtain graphene oxide slurry;

[0031] (2) Take 1g of the above-mentioned graphene oxide slurry, and wash it with water until neutral;

[0032] (3) Dry the graphene oxide slurry cleaned to neutral to obtain graphene oxide, and prepare 100 mL of graphene oxide aqueous solution with a concentration of 0.01 g / mL;

[0033] (4) Add 5g sodium polystyrene sulfonate to the graphene oxide aqueous solution;

[0034] (5) Magnetic stirring, mixing evenly;

[0035] (6) Add 1.5g ascorbic acid, under the condition of magnetic stirring, react in oil bath;

[0036] (7) After the reaction, filter with suction to obtain graphene modified by sodium polystyrene sulfonate.

[0037] (8) The modified graphene was added to a certain volume of distilled water for ultrasonic dispe...

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PUM

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Abstract

The invention discloses a preparation method of a modified graphene aqueous dispersion. The preparation method comprises the following steps: preparing graphene oxide slurry and cleaning the graphene oxide slurry to be neutral; covalently modifying by virtue of surfactants such as polyvinylpyrrolidone, polyoxyethylene and sodium polystyrenesulfonate; then, obtaining graphene which is covalently modified by surfactants such as polyvinylpyrrolidone in one step by means of a reducing action; and carrying out ultrasonic dispersion to obtain the modified graphene aqueous dispersion. The modified graphene aqueous dispersion disclosed by the invention is high in stability, good in dispersibility, low in production cost and simple in process. The required equipment is simple, the yield is high and industrialized production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of graphene, in particular to a method for preparing a highly stable modified graphene aqueous dispersion. Background technique [0002] As a new type of material, graphene has many superior properties, such as high strength, good electrical conductivity, high specific surface area, excellent thermal conductivity, etc.; therefore, it has potential potential in the fields of high-performance nanoelectronic devices, field emission materials, reserves, and sensors. Value. However, due to the high specific surface area of ​​graphene, there is van der Waals force between graphene material layers, so it is easy to agglomerate; Dispersed in various solvents, greatly limiting its application. [0003] In the prior art, water-soluble graphene is usually prepared by exfoliating graphite in an aqueous solution of polyvinylpyrrolidone, or by ultrasonically treating graphite powder, and using non-ionic hydrophilic pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/194
Inventor 王圆圆崔璨孙明娟侯士峰
Owner 山东利特纳米技术有限公司
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