Method for grading and separating graphene materials

A fractional separation and graphene technology, applied in the field of graphene materials, can solve problems such as difficult to separate graphene of different sizes, inability to effectively separate graphene, small graphene size, etc.

Active Publication Date: 2015-01-21
湖北高地石墨烯科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the current graphene separation method, due to the small size and low density of graphene, it is impossible to effectively separate graphene of different sizes through traditional centrifugation and sieving; and membrane filtration technology takes too long, and graphite Graphene is insoluble and difficult to separate graphene of different sizes
Therefore, the current graphene separation method is difficult to separate graphene of different sizes, so it is difficult to play the role of graphene of different sizes

Method used

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  • Method for grading and separating graphene materials

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preparation example Construction

[0031] When the graphene material is graphene, the method for preparing the dispersion liquid of the graphene material includes the following steps 110 to 130 .

[0032] Step 110: Prepare an aqueous solution of surfactant.

[0033] The surfactant is added into the deionized water, stirred evenly, and an aqueous solution of the surfactant is prepared. Preferably, in the aqueous solution of the surfactant, the mass percent concentration of the surfactant is 1%-10%. The mass percent concentration of the surfactant is selected as 1% to 10%. On the one hand, it is ensured that sufficient charges are attached to the graphene to facilitate electrophoretic separation; The removal of surfactants can effectively reduce the influence of surfactants on the performance of graphene products, so as to obtain graphene products of various sizes with high quality and narrow size distribution.

[0034] Step 120: adding graphene into the aqueous solution of surfactant, stirring evenly to obtain...

Embodiment 1

[0070] 1. Add tetramethylammonium bicarbonate into deionized water, stir evenly, and prepare an aqueous solution of a surfactant with a mass percent concentration of 1%.

[0071] 2. Add graphene into the aqueous solution of the above-mentioned surfactant, and stir evenly to obtain a mixed solution, wherein the concentration of graphene is 0.1 mg / mL.

[0072] 3. Ultrasonic disperse the above mixed solution under a 120W ultrasonic wave for 6h, then centrifuge at 1500r / min for 3min, take the supernatant to obtain a graphene dispersion; repeat the above step 2 and this step 3 for the precipitate obtained by centrifugation, and continue Prepare graphene dispersions for subsequent electrophoretic separations.

[0073] 4. Conduct electrophoresis on the graphene dispersion, the voltage gradient of the electrophoresis is 8V / cm, and the electrophoresis time is 4h, wherein samples are taken at the electrode side every 15min, each sampling 10mL, to obtain graphene dispersions of different...

Embodiment 2

[0077] 1. Add tetrabutylammonium bicarbonate into deionized water, stir evenly, and prepare an aqueous solution of surfactant with a mass percent concentration of 10%.

[0078] 2. Add graphene into the aqueous solution of the above-mentioned surfactant, and stir evenly to obtain a mixed solution, wherein the concentration of graphene is 1 mg / mL.

[0079] 3. Ultrasonic disperse the above mixed solution under 180W ultrasonic waves for 2h, then centrifuge at 3000r / min for 1min, take the supernatant to obtain a graphene dispersion; repeat the above step 2 and step 3 for the precipitate obtained by centrifugation, and continue Prepare graphene dispersions for subsequent electrophoretic separations.

[0080] 4. Conduct electrophoresis on the graphene dispersion, the voltage gradient of the electrophoresis is 30V / cm, and the electrophoresis time is 2h, in which, samples are taken at the electrode side every 15min, and each sampling is 10mL to obtain graphene dispersions of different ...

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Abstract

The invention relates to a method for grading and separating graphene materials. The method comprises the following steps: preparing a dispersion liquid of graphene materials, wherein the graphene materials refer to graphene, graphene oxide or graphene quantum dots; and performing electrophoresis on the dispersion liquid of graphene materials, and sampling on the electrode side every 15 minutes, thereby obtaining the dispersion liquid of graphene materials of different sizes, wherein the voltage gradient of electrophoresis is 8V/cm-30V/cm, and the electrophoresis time is 2-4 hours. According to the method for grading and separating graphene materials based on the electrophoresis technology, the graphene materials are graded and separated. The experiment proves that the graphene materials of different sizes can be separated, and graphene materials of different performances are obtained.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a fractionation method for graphene materials. Background technique [0002] Since Andre Geim and Konstantin Novoselof of the University of Manchester successfully stripped pyrolytic graphite and observed graphene for the first time in 2004, the enthusiasm for research on new carbon materials in the academic community has not subsided. The successful separation of graphene means that the theoretical prediction of the thermodynamic instability of two-dimensional crystals has been broken, and it has brought the possibility of many new fields of research. [0003] Perfect graphene has an ideal two-dimensional structure, which is composed of a hexagonal lattice. Each carbon atom is combined with three other carbon atoms in the direction of the lattice plane through a σ bond, and the electrons that do not form a σ bond act as π Electrons form a π orbital system perpendicul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 张麟德张明东
Owner 湖北高地石墨烯科技有限公司
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