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Method for continuously preparing graphene by utilizing ultrasonic wave

A graphene and ultrasonic technology, applied in the field of functional materials and nanomaterials, can solve the problems of limited ultrasonic peeling energy, difficult continuity, long ultrasonic peeling time, etc., and achieve simple and easy post-processing, improve productivity, and reduce production costs. Effect

Inactive Publication Date: 2017-05-31
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited energy of ultrasonic stripping, the graphite needs to be fully intercalated and oxidized to be stripped, and the stripped graphene still needs to be washed many times.
And the ultrasonic peeling time is long, it is difficult to continue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Open the device, use the booster pump to pump the physical foaming agent carbon dioxide into the low-temperature and high-pressure section of the reaction tube, and the working pressure reaches 10MPa, open the feeding device to load the thermal cracking graphite, start the screw to stir, and immerse the physical foaming agent into the graphite Strata.

[0025] 2. Turn on the heating device in the high-temperature and low-pressure section, set the temperature to , put the graphite soaked in the physical foaming agent in the low-temperature and high-pressure section of the reaction tube into the high-temperature and low-pressure zone under the screw belt, turn on the ultrasonic generator in the high-temperature and low-pressure section, and control the frequency density At 1.5w / cm2, the volume of the foaming agent in the graphite interstitial space increases rapidly at high temperature and volatilizes, making the interstitial spacing of the graphite larger, the Van der ...

Embodiment 2

[0029] 1. Open the device, use the booster pump to pump the physical foaming agent liquid nitrogen into the low-temperature and high-pressure section of the reaction tube, the working pressure reaches 12.5MPa, open the feeding device to load natural graphite, open the ultrasonic generator, and control the frequency density at 1.5 w / cm2. Turn on the screw to stir, and immerse the physical foaming agent into the interstitial space of graphite.

[0030] 2. Turn on the heating device in the high-temperature and low-pressure section, set the temperature to , put the graphite soaked in the physical foaming agent in the low-temperature and high-pressure section of the reaction tube into the high-temperature and low-pressure zone under the screw belt, turn on the ultrasonic generator in the high-temperature and low-pressure section, and control the frequency density At 2.0w / cm2, the volume of the foaming agent in the graphite interstitial space increases rapidly at high temperature an...

Embodiment 3

[0034] 1. Open the device, use the booster pump to pump the physical foaming agent liquid ammonia into the low temperature and high pressure section of the reaction tube, the working pressure reaches 15MPa, open the feeding device to load the thermal expansion graphite, start the screw to stir, and immerse the physical foaming agent into the graphite Strata.

[0035] 2. Turn on the heating device in the high-temperature and low-pressure section, set the temperature to , put the graphite soaked in the physical foaming agent in the low-temperature and high-pressure section of the reaction tube into the high-temperature and low-pressure zone under the screw belt, turn on the ultrasonic generator in the high-temperature and low-pressure section, and control the frequency density At 2.5w / cm2, the volume of the foaming agent in the graphite interstitial space increases rapidly at high temperature and volatilizes, making the interstitial spacing of graphite larger, the van der Waals f...

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Abstract

The invention provides a method for continuously preparing graphene by utilizing ultrasonic wave. The method is characterized by comprising the following steps: immerging a physical foaming agent into a graphitic layer under high pressure; cracking the graphitic layer by the foaming agent under a heating condition; and ultrasonically cavitating and stripping in a continuous ultrasonic device, thereby realizing the continuous ultrasonic stripping preparation for graphene. Different from the traditional method that the ultrasonic wave is used to damage the graphitic interlayer structure under a liquid phase condition, continuous scaled production is unavailable, and efficiency is low, the method is suitable for large-scale continuous production; the yield of the graphene is increased; the preparation capacity is promoted; the production cost is obviously lowered; the preparation process is nontoxic and harmless; the operation is safe; the process is simple; the after-treatment is simple and easy; and the method is safe and environment-friendly.

Description

technical field [0001] The invention belongs to the field of functional materials and nanometer materials, in particular to a method for large-scale production of graphene materials. Background technique [0002] Graphene is a carbon atom with sp 2 The honeycomb planar film formed by hybridization is a quasi-two-dimensional material with only one atomic layer thickness, so it is also called single atomic layer graphite. Its thickness is about 0.335nm, and there are different fluctuations depending on the preparation method. Usually, the height in the vertical direction is about 1nm, and the width in the horizontal direction is about 10nm to 25nm. It is all carbon crystals except diamond (zero-dimensional fullerene , one-dimensional carbon nanotubes, three-dimensional bulk graphite) basic structural unit. Graphene in a broad sense is actually multi-layer or thick-layer graphene, with a thickness of more than 10 layers and less than 10nm. The benzene ring structure (that is,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B2204/22C01B2204/30
Inventor 陈庆曾军堂王镭迪
Owner CHENDU NEW KELI CHEM SCI CO LTD
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