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Preparation method of graphene nano-roll

A graphene and nano-roll technology, applied in the field of graphene nano-roll preparation, can solve the problem that the specific surface area of ​​graphene sheets does not have much effect, and achieve the effects of high speed, specific surface area, and improved hydrophilicity

Pending Publication Date: 2022-02-01
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This modification method usually introduces auxiliary agents such as reducing agents, modifiers or surfactants. Although the problem of graphene dispersion is solved after modification, it does not have much effect on increasing the specific surface area of ​​graphene sheets.

Method used

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  • Preparation method of graphene nano-roll
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  • Preparation method of graphene nano-roll

Examples

Experimental program
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Effect test

preparation example Construction

[0037] The invention provides a kind of preparation method of graphene nano volume, comprises the following steps:

[0038] Dispersing the mixed powder of MXene material and graphene in water to form a dispersion liquid, heating, wherein the concentration of the dispersion liquid is 0.1mg / mL~1mg / mL; and

[0039] After the heated dispersion liquid was completely frozen with liquid nitrogen, it was freeze-dried.

[0040] The present invention utilizes MXene materials and graphene to disperse in water to generate electrostatic repulsion, thereby improving graphene's properties without introducing additives such as modifiers, surfactants, and reducing agents, and without complex reactions with organic polymers. Hydrophilicity makes it stably dispersed in water, and at the same time retains the complete sheet structure of graphene, ensures electrical conductivity, and provides a crucial prerequisite for making graphene rolls. Cooling into rolls by liquid nitrogen, on the basis of ...

Embodiment 1

[0057] The preparation of embodiment 1 graphene nano volume

[0058] 1) Put Ti 2 C 3 T x (T x -OH and -F) mixed with graphene according to the mass ratio of 0.5:50, and dispersed in deionized water after ball milling at 400rpm for 4h, to obtain a dispersion with a concentration of 0.1mg / mL;

[0059] 2) Stir and heat the dispersion to 60°C, then quickly pour liquid nitrogen into the dispersion, pre-cool at -30°C for 6 hours, and freeze-dry at -50°C for 24 hours to obtain graphene nanoscrolls. The SEM test results of graphene nanovolumes are as follows: figure 1 shown. Depend on figure 1 It can be seen that the number of graphene nanorolls prepared in this embodiment is large, and the rollability is good. After the rolls, the contact points between the sheets are small, and the stacking of the sheets is reduced, so that the specific surface area is larger. The graphene modified by the MXene material has good hydrophilicity, so that the dispersion liquid can exist stably, ...

Embodiment 2

[0062] The preparation of embodiment 2 graphene nano volumes

[0063] The preparation method of this embodiment 2 is basically the same as that of embodiment 1, the difference is that: Ti 2 C 3 T x The mass ratio to graphene is 0.8:50. The specific steps are described as follows:

[0064] 1) Put Ti 2 C 3 T x (T x -OH and -F) mixed with graphene according to the mass ratio of 0.8:50, and dispersed in deionized water after ball milling at 400rpm for 4h, to obtain a dispersion with a concentration of 0.1mg / mL;

[0065] 2) Stir and heat the dispersion to 60°C, then quickly pour liquid nitrogen into the dispersion, pre-cool at -30°C for 6 hours, and freeze-dry at -50°C for 24 hours to obtain graphene nanoscrolls. The SEM test results of graphene nanovolumes are as follows: image 3 shown. Depend on image 3 It can be seen that the number of graphene nanorolls prepared in this embodiment is large, and the rollability is good. After the rolls, the contact points between th...

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Abstract

The invention relates to the technical field of graphene preparation, in particular to a preparation method of a graphene nano-roll. The preparation method of the graphene nano-roll comprises the following steps: dispersing mixed powder of an MXene material and graphene in water to form a dispersion liquid, and heating the dispersion liquid with the concentration of 0.1 mg / mL to 1 mg / mL; and completely freezing the heated dispersion liquid through liquid nitrogen, and then freeze-drying the material. According to the invention, the MXene material and graphene are dispersed in water to generate electrostatic repulsion, so that the hydrophilicity of graphene is improved on the basis of not introducing an auxiliary agent and not carrying out complex reaction with organic macromolecules, the complete lamellar structure of graphene is reserved, and the conductivity is ensured. Besides, through liquid nitrogen cooling and coiling, on the basis of keeping the complete structure of the graphene, the contact points between the sheet layers are reduced, so that the specific surface area of the sheet layers is relatively high, and the problem of sheet layer stacking is solved.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene nano-volumes. Background technique [0002] Graphene is a sp 2 A new material in which hybridized carbon atoms are tightly packed into a single-layer two-dimensional honeycomb lattice structure. It is a special two-dimensional material with excellent mechanical properties, thermodynamic properties, good electrical conductivity, electrochemical properties and large specific surface area. It is used in medicine, Optoelectronics, sensors, catalysts, energy storage and many other fields have great application value. Due to the harsh process conditions for preparing large-scale single-layer graphene, it is not easy to achieve. The graphene prepared by the prior art is generally multi-layered, and its excellent performance and high specific surface area at the nanometer scale are significantly reduced due to sheet stacking. It can't play a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 王珺杜真真王晶于帆李炯利王刚王旭东罗圭纳
Owner 北京石墨烯技术研究院有限公司
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