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Method for producing graphene by mechanically shearing and stripping

A mechanical shearing and graphene technology, applied in the research field of carbon nanomaterials, can solve the problems of high cost, difficult and high quality, environmental pollution, etc., and achieve the effect of low cost and easy operation.

Inactive Publication Date: 2017-08-01
李源作 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, people have been studying the production methods of graphene. At present, the main production methods of graphene in China mainly include redox method, chemical vapor deposition method, high temperature cracking method, intercalation stripping method, etc., using redox method, redox method It has the advantages of high efficiency and low cost, and can produce graphene in large quantities, but this method uses a large number of oxidants and reducing agents in the production process to cause serious environmental pollution, and damage the crystal structure of graphene, affecting the comprehensive performance of graphene ; The chemical vapor deposition method has high cost and complicated process, and it is difficult to achieve large-scale production; it is currently difficult to obtain high-quality, large-scale graphene by pyrolysis

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  • Method for producing graphene by mechanically shearing and stripping

Examples

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Effect test

Embodiment 1

[0023] A method for producing graphene by mechanical shear exfoliation, the method comprising the following steps: flake graphite and water are initially stirred and mixed to obtain a graphite mixed solution, the graphite mixed solution is subjected to high-shear exfoliation to obtain a graphene solution, and the graphene solution is centrifuged The graphene solution is obtained by processing, and the graphene solution is put into a vacuum drying oven to dry to obtain a graphene product.

[0024] Preliminary stirring and mixing steps: mix 10 g of flake graphite with 1000 g of pure water; stir with a stirrer at a stirring speed of 2000 r / min; the stirring time is 20 min, and the graphite mixed liquid is obtained after stirring.

[0025] High-shear stripping step: add 50.5g surfactant NMP (N-methylpyrrolidone) to the graphite mixed solution obtained by preliminary stirring and mixing, and the surfactant NMP and graphite mixed solution are mixed in a ratio of 5: 100 with a mass ra...

Embodiment 2

[0030] A method for producing graphene by mechanical shear exfoliation, the method comprises the following steps: the scaly graphite and water are initially stirred and mixed to obtain a graphite mixed solution, the graphite mixed solution is subjected to high-shear exfoliation to obtain a graphene solution, and the graphene solution is centrifuged The graphene solution is obtained by processing, and the graphene solution is put into a vacuum drying oven to dry to obtain a graphene product.

[0031] Preliminary stirring and mixing steps: mix 10 g of scaly graphite with 800 g of pure water; stir with a stirrer at a stirring speed of 1800 r / min; stir for 30 minutes, and obtain a graphite mixed liquid after stirring.

[0032] High-shear stripping step: add 56.7g surfactant NAC (N-acetylcysteine) to the graphite mixed solution obtained by preliminary stirring and mixing, and the ratio of surfactant NAC and graphite mixed solution is 7: 100 in mass ratio Mixing, using a high-speed ...

Embodiment 3

[0037] A method for producing graphene by mechanical shear exfoliation, the method comprising the steps of: mixing scaly and flake graphite with water to obtain a graphite mixed solution through preliminary stirring, and obtaining a graphene solution by high-shear exfoliating the graphite mixed solution, graphite The dilute solution is centrifuged to obtain a graphene solution, and the graphene solution is put into a vacuum drying oven to dry to obtain a graphene product.

[0038] Preliminary stirring and mixing steps: mix 10 g of scaly and flake graphite with 1200 g of pure water; stir with a stirrer at a stirring speed of 2200 r / min; stir for 30 min, and obtain a graphite mixed liquid after stirring.

[0039] High-shear stripping step: add 60g of surfactant NMP and NAC to the graphite mixture obtained by preliminary stirring and mixing, and mix the surfactant NMP, NAC and graphite mixture at a mass ratio of 5:100, and use a high-speed stripping machine Continuous shearing an...

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Abstract

The invention belongs to the research field of carbon nanomaterials, and in particular relates to a method for producing graphene by mechanical shear exfoliation; the method comprises the following steps: graphite and water are initially stirred and mixed to obtain a graphite mixture, and the graphite mixture is subjected to high shear exfoliation A graphene solution is obtained, the graphene solution is centrifuged to obtain a graphene solution, and the graphene solution is put into a vacuum drying oven to dry to obtain a graphene product. The present invention mainly utilizes graphite to mix through preliminary stirring, and interlayer bonding strength is obviously weakened, and the graphite mixed liquid expands to produce very thin liquid layer, then undergoes rapid rotation, and shearing and peeling can efficiently produce graphene; the present invention produces graphite by mechanical shearing and peeling The dilute method has the advantages of low cost, no pollution, easy operation and quantitative production.

Description

technical field [0001] The invention belongs to the research field of carbon nanomaterials, in particular to a method for producing graphene by mechanical shearing and exfoliation. Background technique [0002] Graphene is the thinnest, the strongest, and the strongest electrical and thermal conductivity nanomaterials found so far. It has very good strength, flexibility, electrical conductivity, thermal conductivity, and optical characteristics. Computers, aerospace and other fields have been widely developed, showing the broad application prospects of graphene materials. The research on graphene has entered a stage of rapid development, and graphene has become the "star" material in today's new materials. [0003] In recent years, people have been studying the production methods of graphene. At present, the main production methods of graphene in China mainly include redox method, chemical vapor deposition method, high temperature cracking method, intercalation stripping met...

Claims

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Application Information

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IPC IPC(8): C01B32/19
CPCC01B2204/22C01B2204/26C01B2204/32C01P2002/72C01P2002/82C01P2004/03
Inventor 李源作田树梁
Owner 李源作
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