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Method for preparing graphene by exfoliating graphite using shear thickening system

A technology for exfoliating graphite and graphene, applied in the directions of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of destroying the lattice structure of graphene, increasing the cost of wastewater treatment, and low shear stripping efficiency, and achieving easy separation. The effect of high purification and stripping efficiency and good industrial application prospects

Active Publication Date: 2019-07-23
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this method requires the use of strong acids and strong oxidants as intercalants, which will not only destroy the regular lattice structure of graphene, but also cause environmental pollution and increase the cost of wastewater treatment.
[0008] According to the above, although graphene can be obtained by shearing and exfoliating graphite mechanically, there are still many unresolved problems, such as: complex preparation process, low efficiency of shearing and exfoliation, difficult separation and purification, and severe environmental problems. Adverse effects on industrial production and industrial application

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  • Method for preparing graphene by exfoliating graphite using shear thickening system
  • Method for preparing graphene by exfoliating graphite using shear thickening system
  • Method for preparing graphene by exfoliating graphite using shear thickening system

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Embodiment 1

[0024] In this embodiment, the ethylene glycol-polymer microsphere system is used as the shear thickening system to exfoliate graphite to prepare graphene. The steps are: take 60 g of ethylene glycol, 40 g of methyl methacrylate microspheres with a diameter of 10 nm, mix them uniformly, and add Graphite powder 0.5g, 300rpm ball mill shear 6h, leave standstill, centrifugal separation (relative velocity is small during centrifugal separation, shearing force is low, system viscosity is low), after drying, obtain graphene powder.

Embodiment 2

[0026] In this embodiment, the polyethylene glycol-polymer microsphere system is used as a shear thickening system to exfoliate graphite to prepare graphene. The steps are: take 200 g of polyethylene glycol solution, 125 g of polymethyl methacrylate microspheres with a diameter of 500 nm, Mix evenly, add 10g of microcrystalline graphite, shear at 200-350rpm at high speed for 6h, let stand, centrifuge, and dry to obtain graphene powder.

Embodiment 3

[0028] Present embodiment adopts surfactant-inorganic salt system as shear thickening system to exfoliate graphite and prepare graphene, and its step is: get 3.6g hexadecyltrimethylammonium bromide and 0.35g sodium salicylate, dissolve in Add 1 g of 325-mesh graphite to 100 mL of water, shear at 250 rpm for 8 hours, let stand, centrifuge, and dry to obtain graphene powder.

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Abstract

The invention discloses a method for stripping graphite to prepare graphene by utilizing a shear thickening system. The method comprises the following steps: mixing the shear thickening system and graphite, and enabling a mixed liquid to be positioned in a shear thickening high-viscosity state by virtue of mechanical shearing, so that the shear stress between the shear thickening system and a graphite interface can be obviously enhanced, and the efficiency of stripping the graphite to prepare graphene is improved; and restoring the mixed liquid to be in a non-shear thickening low-viscosity state after the mechanical shearing is removed or a shear rate is reduced, and facilitating rapid centrifugal separation, thereby obtaining high-quality graphene. The method has the characteristics of being simple and convenient in process, high in stripping efficiency, easy to separate and purify, short in production cycle, low in cost, stable in product quality and the like, and contributes to realizing industrial production and application of the graphene.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing graphene by using a shear thickening system to exfoliate graphite. Background technique [0002] Graphene is a two-dimensional nanomaterial composed of conjugated carbon atoms to form a hexagonal planar structure. Graphene has excellent mechanical, thermal, electrical and high charge carrier mobility, as well as good mechanical strength and transparency, and has broad application prospects in many fields such as electronic materials, biomedicine and energy storage. [0003] At present, the methods for preparing graphene mainly include chemical redox method, chemical vapor deposition method, mechanical exfoliation method and liquid phase exfoliation method. Among them, the chemical oxidation-reduction method can realize the mass production of graphene, but because the oxidation-reduction process will destroy the lattice structure of graphene, the obtained ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B2204/04
Inventor 杨应奎邱胜强何承恩雷盛
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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