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Methods for preparing graphene or graphene oxide

A technology of graphene and graphite, which is applied in the field of preparation of graphene or graphene oxide, can solve problems such as difficulties, and achieve the effects of weakening damage, high collision frequency, and high grinding efficiency

Active Publication Date: 2012-10-03
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the methods proposed by CN200810196832.X and CN101857221A have improved stripping efficiency, there are great difficulties in the removal and separation of fine particles and liquids

Method used

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  • Methods for preparing graphene or graphene oxide
  • Methods for preparing graphene or graphene oxide
  • Methods for preparing graphene or graphene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Use 100g of a 0.3×5mm magnetic stainless steel needle and 10g of 300-mesh graphite powder into a 300ml plastic grinding container, turn on the rotating magnetic field, the magnetic field switching frequency is 1800r / min, the magnetic induction at the bottom of the grinding container is 0.2T, and stop after 12h. The graphite and the steel needle are taken out from the plastic container, and subjected to magnetic separation to obtain the graphite nano-microflake-graphene dry powder mixture.

[0064] The schematic diagram of the device is as figure 1 As shown, the present embodiment adopts 4 permanent magnets to form the magnetic field transformation space above the plane, figure 1 -a is a schematic diagram of the three-dimensional state of the magnetic stainless steel needle being attracted by the magnet when it is at rest, figure 1 -b is a schematic diagram of a magnetic stainless steel needle being attracted by a magnet at rest, figure 1 -c is a schematic diagram of t...

Embodiment 2

[0066] Use 200g of 0.5×5mm magnetic stainless steel needle, 10g of 300 mesh graphite powder, 0.5g of aluminate coupling agent, put them into a 500ml ceramic grinding container, turn on the rotating magnetic field, the magnetic field switching frequency is 1500r / min, and the magnetic induction at the bottom of the grinding container The strength is 0.1T, stop after 8h, take out the graphite and steel needle from the container, and obtain the graphite nano-flake-graphene mixture through magnetic separation, mix it with graphite nano-flake-graphene with 2000ml ethanol, and after ultrasonication for 4h, After settling for 24 hours, take the upper layer suspension and centrifuge at 3000r / min for 1 hour. What settles is the nanographite microflakes, and the upper layer is the suspension of graphene.

[0067] The schematic diagram of the device is as figure 2 As shown, the present embodiment adopts four permanent magnets to form a cylindrical transformed magnetic field space, figu...

Embodiment 3

[0069] Use 0.3×5mm magnetic stainless steel needle 300g, 300-mesh graphite powder 10g, put it into a 500ml quartz glass container, turn on the rotating magnetic field, the magnetic field conversion frequency is 1800r / min, the magnetic induction intensity at the bottom of the grinding container is 0.15T, stop after 16h, from Take out the graphite and steel needles from the container, and magnetically separate them to obtain a graphite nanoflake-graphene mixture, mix them with 2000ml N-methylpyrrolidone and graphite nanoflakes-graphene, settle for 48 hours, take the upper liquid, and pass through 3000r / min Centrifuge for 0.5 h, take the supernatant, and freeze-dry to obtain loose single-layer or multi-layer graphene dry powder. The high-resolution transmission electron microscopy (HRTEM) image of the obtained graphene powder is as follows: image 3 , the Raman spectrum (RAMAN) of the obtained graphene is as Figure 4 , X-ray diffraction (XRD) patterns of graphite raw material a...

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Abstract

The invention relates to methods for preparing graphene or graphene oxide, and belongs to the technical field of preparation of nanometer materials. A wet method comprises the following steps of: putting a carbon material, a magnetic steel needle grinding body and a solvent into a grinding container, and closing; putting the container into a space with a changing magnetic field, and peeling to obtain a mixture of graphite nanometer microchip-graphene; and separating the graphite nanometer microchip-graphene from a steel needle, settling, and performing centrifugal separation to obtain transparent suspension of the graphene. A dry method comprises the following steps of: putting a carbon material and a magnetic steel needle grinding body into a grinding container, and closing; and putting the container into a space with a changing magnetic field, and peeling to obtain mixture dry powder of graphite nanometer microchip-graphene. The methods have the characteristics of high collision frequency and grinding efficiency and short preparation time.

Description

technical field [0001] The invention relates to a preparation method of graphene or graphene oxide, belonging to the technical field of nanomaterial preparation. Background technique [0002] Graphene is a single-layer carbon atom surface material peeled off from graphite materials. The thickness of this two-dimensional graphite crystal film is only one carbon atom thick, but its strength is 100 times that of steel. It is currently the material with the fastest conduction speed at room temperature, the greatest mechanical strength, and the strongest thermal conductivity. Graphite nanocrystals with a thickness of 1-10 layers are called graphene. According to the number of layers of carbon atoms, or the thickness of graphene, it can be divided into single-layer graphene (Single-layer graphene), double-layer graphene (Double-layer graphene) graphene) and multilayer graphene (Few-layer graphene), when the thickness is more than 10 layers, its performance is basically the same a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00C01B32/19C01B32/196
CPCY02P20/54
Inventor 赵增典于先进艾蒙张洪雷孙英祥张丽鹏李德刚邢伟
Owner SHANDONG UNIV OF TECH
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