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A preparing method of an aqueous stable graphene dispersion liquid

A technology of dispersion liquid and alkene water, applied in the field of graphite powder, can solve the problems of environmental pollution waste, loss of physical and chemical properties of graphene, etc., and achieve the effects of good dispersibility, convenient operation and high stability

Inactive Publication Date: 2016-05-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of graphene water-based stable dispersion liquid, to solve the pretreatment of graphene with concentrated acid and other strong oxidizing agents existing in the prior art, cause loss to the physical and chemical properties of graphene , the problem of generating any waste that pollutes the environment

Method used

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  • A preparing method of an aqueous stable graphene dispersion liquid
  • A preparing method of an aqueous stable graphene dispersion liquid
  • A preparing method of an aqueous stable graphene dispersion liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Add 0.1g of polycarboxylate superplasticizer to 100mL water, stir magnetically for 1-2min, add 0.5g of γ-diethylenetriaminopropylmethyldimethoxysilane, stir magnetically for 2-3min until uniform dispersion;

[0024] (2) Add 0.1 g of graphene into the prepared dispersion, stir magnetically for 2-3 minutes, and disperse ultrasonically for 1 hour to obtain a highly dispersible and stable graphene aqueous dispersion.

[0025] From figure 1 It can be seen that graphene spontaneously agglomerates due to its own van der Waals force, resulting in uneven dispersion during use and failing to achieve the desired effect.

[0026] From figure 2 It can be seen that graphene presents a multi-layer transparent state, indicating that the dispersion effect is obvious.

[0027] Such as image 3 , graphene has a strong diffraction peak around 2θ=11°, and the graphene dispersed by the dispersant has no diffraction peak and is completely amorphous. This is because the dispersant is h...

Embodiment 2

[0029] (1) Add 1g of polycarboxylate superplasticizer to 10mL of water, stir magnetically for 1-2min, add 5g of N-β-aminoethyl-γ-aminopropyltriethoxysilane, stir magnetically for 2-3min until uniform dispersion ;

[0030] (2) Add 0.1 g of graphene into the prepared dispersion, stir magnetically for 2-3 minutes, and disperse ultrasonically for 10 hours to obtain a highly dispersible and stable graphene aqueous dispersion.

Embodiment 3

[0032] (1) Add 0.25g of polycarboxylate superplasticizer to 40mL of water, stir magnetically for 1-2min, add 1.25g of γ-diethylenetriaminopropyltrimethylsilane, stir magnetically for 2-3min until uniform dispersion;

[0033] (2) Add 0.1 g of graphene into the prepared dispersion, stir magnetically for 2-3 minutes, and disperse ultrasonically for 2.5 hours to obtain a highly dispersible and stable graphene aqueous dispersion.

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Abstract

A preparing method of an aqueous stable graphene dispersion liquid is provided. The method includes (1) a step of adding a dispersing agent into water, and performing magnetic stirring for 2-3 min until dispersion is uniform with the mass volume ratio of the dispersing agent to the water being 0.5-5:10-100 g / mL, and (2) a step of adding graphene into the prepared dispersing solution with the mass volume ratio of the graphene to the water in the step (1) being 0.1:10-100 g / mL, performing magnetic stirring for 2-3 min and performing ultrasonic dispersion for 1-10 h to obtain the aqueous stable graphene dispersion liquid high in dispersity. Concentrated acids and other strong oxidants are not adopted for oxidation of the graphene in a preparing process of the method. The method brings no loss to physical and chemical properties of the graphene and does not produce waste polluting the environment.

Description

technical field [0001] The invention belongs to the technical field of graphite powder, in particular to a method for preparing a graphene aqueous stable dispersion. Background technique [0002] Graphene, which is carbon atoms with sp 2 The single-atom-thick two-dimensional atomic crystal of hybrid connection is composed of a dense layer of carbon atoms wrapped in a honeycomb crystal lattice. It is the thinnest two-dimensional material in the world, with a thickness of only 0.35nm. This special structure contains rich and novel physical phenomena, which makes graphene exhibit many excellent properties. Ultra-high specific surface area (theoretically, the specific surface area of ​​single-layer graphene can reach 2630m 2 / g), extraordinary electrical properties and electron transport capabilities, unpredictable bending properties and impermeability, mechanical properties (the strength of graphene is the highest among the tested materials, up to 130GPa, more than 100 times ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01P2002/72C01P2004/03C01P2004/04
Inventor 郭丽萍王虹曹园章孙伟
Owner SOUTHEAST UNIV
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