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A method for preparing graphene by gas-driven liquid phase exfoliation in a microchannel

A gas-driven, liquid-phase exfoliation technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of increased energy consumption, graphene fragmentation, and lower quality, and achieve low production costs and high-quality graphene. High, adjustable reaction conditions

Active Publication Date: 2022-03-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to achieve this critical shear rate, it is usually necessary to apply high-intensity mechanical force, such as high-pressure homogenization or high-speed stirring, which will increase energy consumption, and more importantly, it will fragment graphene and reduce its quality

Method used

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  • A method for preparing graphene by gas-driven liquid phase exfoliation in a microchannel
  • A method for preparing graphene by gas-driven liquid phase exfoliation in a microchannel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) 4000mg of graphite is added to 100ml of pure N-methylpyrrolidone organic solvent, fully stirred to obtain a graphite dispersion with a concentration of 40mg / ml;

[0028] 2) Use a high-pressure infusion pump to feed the graphite dispersion into the liquid phase inlet channel of the microchannel reactor at a flow rate of 1.5 L / h, wherein the liquid phase inlet channel has an equivalent size of 300 μm and a length of 50 mm; use a gas flow meter to control the gas flow at 200 L / h The flow rate of h is passed into the gas phase inlet channel of the microchannel reactor, wherein the gas phase inlet channel has a size of 600 μm and a length of 50 mm; after the gas and liquid merge, the gas and liquid outlet channel flows out at a high speed, and the dispersion liquid after a peeling is collected; the gas phase and liquid phase The confluence angle of the inlet channel is 90°, the equivalent size of the gas-liquid mixture outlet channel is 600μm, and the length is 120mm;

[...

Embodiment 2

[0032] 1) Add 6000mg of graphite to 120ml of pure dimethylformamide, stir thoroughly to obtain a graphite dispersion with a concentration of 50mg / ml;

[0033] 2) Use a high-pressure infusion pump to feed the graphite dispersion into the liquid phase inlet channel of the microchannel reactor at a flow rate of 2.5 L / h, wherein the liquid phase inlet channel has an equivalent size of 300 μm and a length of 40 mm; use a gas flow meter to control the gas flow at 350 L / h The flow rate of h is passed into the gas phase inlet channel of the microchannel reactor, wherein the gas phase inlet channel has a size of 800 μm and a length of 30 mm; after the gas and liquid merge, the gas and liquid outlet channel flows out at a high speed, and the dispersion liquid after a peeling is collected; the gas phase and liquid phase The confluence angle of the inlet channel is 120°, the equivalent size of the gas-liquid mixture outlet channel is 800μm, and the length is 70mm;

[0034] 3) The dispersi...

Embodiment 3

[0037] 1) 2000mg of graphite is added to 80ml of chloroform, fully stirred to obtain a graphite dispersion with a concentration of 25mg / ml;

[0038] 2) Use a high-pressure infusion pump to feed the graphite dispersion into the liquid phase inlet channel of the microchannel reactor at a flow rate of 4L / h, wherein the liquid phase inlet channel has an equivalent size of 500 μm and a length of 20mm; use a gas flow meter to control the gas flow rate at 400L / h The flow rate is passed into the gas phase inlet channel of the microchannel reactor, wherein the gas phase inlet channel has a size of 1000 μm and a length of 50 mm; after the gas and liquid are combined, the gas and liquid outlet channel flows out at a high speed, and the dispersed liquid after a stripping is collected; the gas phase and liquid phase inlet The confluence angle of the channel is 60°, the equivalent size of the gas-liquid mixture outlet channel is 1000 μm, and the length is 100 mm;

[0039] 3) The dispersion ...

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Abstract

A method for preparing graphene by gas-driven liquid phase exfoliation in a microchannel: the graphite dispersion is passed into the liquid phase inlet channel of the microchannel reactor, and air is passed into the gas phase inlet channel of the microchannel reactor at the same time, and the liquid phase , After the gas phases are combined, the liquid flows out from the gas-liquid outlet channel of the microchannel reactor under the drive of the gas, and the dispersion liquid after the stripping is obtained once, and the stripping operation is repeated, the dispersion liquid after the circulation stripping is collected, centrifuged, and the supernatant is taken. After drying, the graphene powder can be obtained; the reaction conditions for the preparation of graphene in the present invention can be adjusted, the equipment is simple, the production cost is low, the efficiency is high, and the graphene quality is high, which can be applied to fields such as biomedicine, optoelectronic materials, and energy.

Description

technical field [0001] The invention relates to a method for preparing graphene by using gas-driven liquid phase stripping in a microchannel, and belongs to the technical field of graphene preparation. Background technique [0002] Graphene, a two-dimensional nanomaterial with a thickness of only one carbon atom, has been discovered by British scientists Geim et al. in 2004. Because of its excellent physical and chemical properties, such as high mechanical strength, high carrier mobility, and high electrical conductivity etc., showing broad application prospects in the fields of electronics, catalysis, energy storage and conversion, and composite materials. Nevertheless, the application of graphene still faces great challenges, one of which is how to achieve large-scale and low-cost preparation of high-quality graphene. [0003] At present, the preparation methods of graphene include liquid phase exfoliation method, mechanical exfoliation method, redox method, chemical vapo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/32C01B2204/04
Inventor 张智亮缪鑫峰计建炳
Owner ZHEJIANG UNIV OF TECH
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