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Turbulence method for preparing high-quality graphene

A graphene, high-quality technology, applied in the turbulent flow of the preparation of high-quality graphene, the use of turbulent flow in the field of graphene preparation in solution, can solve the problems of affecting the electrical properties of graphene performance, limiting the quality of graphene, and large graphene defects. , to achieve the effect of less defects, easy scale and uniform thickness

Active Publication Date: 2013-10-16
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cavitation is accompanied by a severe process of local high temperature and high pressure, which causes large defects in graphene, limits the quality of the prepared graphene, and affects the performance (especially the electrical properties) of the prepared graphene.

Method used

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  • Turbulence method for preparing high-quality graphene
  • Turbulence method for preparing high-quality graphene
  • Turbulence method for preparing high-quality graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, in N-dimethylformamide solvent, stirring produces turbulent flow to peel off flake graphite and prepares high-quality graphene as embodiment, is used to produce the stirring device of turbulent flow such as Figure 2a , Figure 2b As shown, the detailed process steps are as follows:

[0031] Step 1: take flake graphite powder 1200mg, be dispersed in 400mL N-dimethylformamide solvent, obtain the graphite dispersion of 3mg / mL;

[0032] Step 2: Transfer the prepared graphite dispersion to a stirring container, the stirring speed is 5000rpm, and the corresponding Reynolds number is 2×10 6 , to obtain turbulent flow;

[0033] Step 3: process graphite dispersion liquid 1h with turbulence;

[0034] Step 4: Leave the dispersion liquid after turbulence treatment for 1 hour, then take out the upper layer dispersion liquid;

[0035] Step 5: the supernatant liquid that takes out is packed in the centrifuge tube, then with the centrifugal processing 45min of the ce...

Embodiment 2

[0038] Embodiment 2, with in the mixed solution of water and acetone, stirring produces turbulent flow and exfoliates flake graphite and prepares high-quality graphene as embodiment, is used to produce the stirring device of turbulent flow such as Figure 2a , Figure 2b As shown, the detailed process steps are as follows:

[0039] Step 1: Configure 400mL of a mixed solution of water and acetone, the mass fraction of acetone is 75%, and the rest is deionized water, disperse 1200mg flake graphite powder in it to obtain a 3mg / mL graphite dispersion, and put it into a stirring container Inside;

[0040] Step 2: The stirring speed is 5000rpm, and the corresponding Reynolds number is 2×10 6 , to obtain turbulent flow;

[0041] Step 3: Treat the graphite dispersion with turbulent flow for 2 hours;

[0042] Step 4: Leave the dispersion liquid after turbulence treatment for 1 hour, then take out the upper layer dispersion liquid;

[0043] Step 5: the supernatant dispersion liquid...

Embodiment 3

[0045] Embodiment 3, in N-methylpyrrolidone, stirring produces turbulent flow to exfoliate expandable graphite and prepares high-quality graphene as an example, and the stirring device used to generate turbulent flow is as Figure 2a , Figure 2b As shown, the detailed process steps are as follows:

[0046] Step 1: take expandable graphite powder 1200mg, be dispersed in 400mL N-methylpyrrolidone solvent, obtain the graphite dispersion of 3mg / mL;

[0047] Step 2: Transfer the prepared graphite dispersion to a stirring container, the stirring speed is 5000rpm, and the corresponding Reynolds number is 2×106 , to obtain turbulent flow;

[0048] Step 3: Treat the graphite dispersion with turbulent flow for 0.5h;

[0049] Step 4: Leave the dispersion liquid after turbulence treatment for 1 hour, then take out the upper layer dispersion liquid;

[0050] Step 5: the supernatant dispersion liquid that takes out is packed in the centrifuge tube, then with the centrifugal processing 4...

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Abstract

The invention discloses a turbulence method for preparing high-quality graphene. The turbulence method comprises seven steps: 1, dispersing graphite powder into a solution to obtain graphite dispersion liquid; 2, rotating the graphite dispersion solution in a container at high speed to obtain turbulence; 3, processing the graphite powder dispersion solution by using the turbulence; 4, standing the processed solution and taking the upper layer of solution; 5, performing centrifugal separation on the upper layer of solution; 6, collecting the upper layer of solution which is subjected to high-speed centrifugal separation to obtain a stable high-quality graphene dispersion solution; 7, performing suction filtration or distillation on the graphene dispersion solution to obtain graphene powder. The turbulence method is mild in preparation process, low in equipment investment, low in raw material cost, high in production safety, simple and convenient to operate, feasible, environmentally friendly, considerable in yield, high in reproducibility, applicable to laboratory research and suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to a turbulent flow method for preparing high-quality graphene, in particular to a technology for preparing graphene in a solution using turbulent flow. The invention belongs to the technical field of graphene preparation. Background technique [0002] With its unique and excellent properties in physics, chemistry, electricity, mechanics, etc., graphene has shown broad application prospects in many fields such as new materials, new energy, and electronic components. However, in the long run, the most important prerequisite for the real large-scale application of graphene is to develop a low-cost, large-volume, and pollution-free graphene preparation technology. Similarly, the large-scale, low-cost, and pollution-free preparation technology of graphene is also one of the core issues about the basic research and industrial application of this material. [0003] Graphene was prepared for the first time by Novoselov and Geim, winner...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/19
Inventor 沈志刚易敏麻树林张晓静
Owner BEIHANG UNIV
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