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Method for preparing graphene from graphite through HPLC (high performance liquid chromatography) stripping

A liquid-phase exfoliation and graphene technology, applied in the field of nanomaterials, can solve problems such as low efficiency, achieve the effect of improving the exfoliation efficiency and enhancing the effect of mechanical exfoliation

Inactive Publication Date: 2017-05-24
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of method for preparing graphene by high-efficiency liquid phase exfoliation graphite, overcome above-mentioned graphene preparation method or need oxidation intercalation, or the deficiency of low efficiency, thus invent a A concise and effective method for viscosity-enhanced exfoliated graphite to prepare high-quality graphene

Method used

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  • Method for preparing graphene from graphite through HPLC (high performance liquid chromatography) stripping
  • Method for preparing graphene from graphite through HPLC (high performance liquid chromatography) stripping
  • Method for preparing graphene from graphite through HPLC (high performance liquid chromatography) stripping

Examples

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Embodiment 1

[0054] A large-scale technical method for preparing graphene based on viscosity-enhanced exfoliated graphite, realized by the following scheme: first weigh 50g polyvinyl chloride (PVC) and dissolve it in 100mL N-methylpyrrolidone (NMP) to form a uniform and viscous medium system , The viscosity of the medium system is controlled at around 8000cP. Then, weigh 3 g of expanded graphite and add it to the prepared medium system, and manually stir and mix evenly to form a mixture. The mixture was put into a 250mL temperature-controllable jacketed beaker, and then sheared at a speed of 5000 rpm for 2 hours with a shear disperser to achieve graphite exfoliation. Pour out the sheared composite slurry again, add a large amount of organic solvent N-methylpyrrolidone (NMP) identical to the above steps to dilute until the black aggregates in the composite slurry are completely dispersed, and then stand overnight. Centrifuge and wash at 5000 rpm for 10 minutes to remove the polymerized pol...

Embodiment 2

[0057] A technical method for large-scale preparation of graphene based on viscosity-enhanced exfoliated graphite, realized by the following scheme: first weigh 26g of polyethylene (PE) and dissolve it in 100mL of dimethylformamide (DMF) to form a uniform and viscous medium system , The viscosity of the medium system is controlled at about 1000cP. Then, weigh 1 g of expandable graphite and add it to the prepared medium system, and manually stir and mix evenly to form a mixture. The mixture was put into a 250 mL temperature-controllable jacketed beaker, and then sheared with a shear disperser at a speed of 4000 rpm for 2.5 hours to achieve graphite exfoliation. Pour out the sheared composite slurry again, add a large amount of organic solvent dimethylformamide (DMF) identical to the above steps to dilute until the black aggregates in the composite slurry are completely dispersed, and then stand overnight, After centrifuging and washing at 4000 rpm for 15 minutes, polymerized p...

Embodiment 3

[0059] A large-scale technical method for preparing graphene based on viscosity-enhanced exfoliated graphite is realized by the following scheme: first weigh 80g nylon (PA) and dissolve it in 100mL formamide to form a uniform and viscous medium system, and the viscosity of the medium system is controlled at About 50000cP. Then, weigh 0.5 g of 325-mesh flake graphite and add it to the prepared medium system, and manually stir and mix evenly to form a mixture. The mixture was put into a 250mL temperature-controllable jacketed beaker, and then sheared at a speed of 3000 rpm for 3 hours with a shear disperser to achieve exfoliation of graphite. Then pour out the sheared composite slurry, add a large amount of organic solvent formamide same as the above steps to dilute until the black aggregates in the composite slurry are completely dispersed, then let stand overnight, and centrifuge at 3000 rpm After washing for 30 minutes, the polymerized polymer was removed, and the upper laye...

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Abstract

The invention provides a method for preparing graphene from graphite through HPLC (high performance liquid chromatography) stripping. The method comprises steps as follows: 1), preparation of a medium system: a), the medium system is prepared from macromolecules and an organic solvent which are polymerized; or b), the medium system is prepared from macromolecule prepolymers; 2), shearing and stripping: graphite raw materials are uniformly dispersed in the prepared medium system, a mixture is formed and then is sheared, graphite stripping is realized, and composite slurry is obtained; 3), separation: the composite slurry is separated, and graphene powder can be obtained. According to the method, the stripping efficiency is substantially improved by the aid of medium viscosity, wettability between graphite and medium is improved through matching with interface energy, and the problem of dispersion of the graphene is solved. The stripping efficiency of a common solvent is far lower than 1%, but the stripping efficiency of the invention can reach 100%. The method is simple and efficient, and high-yield and large-scale industrial production of high-quality graphene can be realized with the method.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a method for preparing a two-dimensional nanomaterial-graphene, in particular to a method for preparing a two-dimensional nanomaterial-graphene by using high-efficiency liquid phase exfoliation of graphite. Background technique [0002] The concept of graphene (Graphene) was proposed as early as the 1980s, because considering the stable state of matter in nature, it is believed that graphene cannot exist. But in 2004, British scientists Novosenov and Gaim successfully obtained a new two-dimensional planar carbon material with atomic thickness - graphene in the laboratory (Novoselov, K.S. et al.Science, 2004, 306, 666669.) . The theoretical specific surface area of ​​graphene is as high as 2600m 2 / g; the mechanical strength and thermal conductivity are equivalent to those of three-dimensional graphite crystals, which are 1060GPa and 3000W / m K respectively; it has excellent ...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 丁古巧周超何朋谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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