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Graphene dispersant and applications thereof

A graphene dispersant and graphene technology, applied in the field of graphene dispersants, can solve the problems of graphene material chemical composition and physical morphology changes, insignificant effect, non-universal application, etc., to facilitate large-scale implementation, The effect of low cost and improved dispersion

Active Publication Date: 2016-06-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the commonly used methods is to add auxiliary dispersants such as surfactants to the dispersion medium. Although it can improve the dispersion of graphene to a certain extent, the effect is not obvious, and generally speaking, specific surfactants Only applicable to specific dispersion media, not universal
Another way is to chemically modify graphene to improve its dispersion performance, but this method will lead to changes in the chemical composition and physical morphology of graphene materials.

Method used

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  • Graphene dispersant and applications thereof
  • Graphene dispersant and applications thereof
  • Graphene dispersant and applications thereof

Examples

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preparation example Construction

[0061] Another aspect of the present invention also provides a method for preparing a graphene dispersion, which includes: uniformly mixing graphene and the graphene dispersant in a dispersion medium to form a stable dispersion.

[0062] In some embodiments, a graphene dispersion method may include: only dissolving the graphene dispersant and graphene in an organic solvent, thereby forming a stable dispersion. It should be noted that the "dissolved" mentioned here is not understood by those of ordinary skill as dissolved, but should be understood as "incorporated", "dispersed into" or "mixed in", etc. For example, the graphene dispersant and graphene can be added into an organic solvent, and stirred or ultrasonically dispersed, for example, ultrasonically dispersed for more than 1 hour, so as to form a stable dispersion liquid.

[0063] More preferably, the dispersion contains graphene at a concentration of 1 mg / ml-10 mg / ml.

[0064] In the graphene dispersion method, the mol...

Embodiment 1

[0081] Synthesis of embodiment 1 aniline trimer carboxyl derivative and graphene aqueous dispersion thereof

[0082] Dissolve 1.24 g of aniline trimer in 50 ml of THF, add 1.04 g of succinic anhydride, react for 3 hours, and precipitate with petroleum ether to obtain aniline trimer carboxyl derivatives. Weigh the obtained aniline trimer carboxyl derivatives and 2 times the molar equivalent of NaOH and configure different concentrations of aqueous solutions with the graphene slurry (graphene content 4.5%), and ultrasonically disperse for 1 hour. The effect is shown in Table 1. At the graphene concentration When it is below 3mg / ml, a stable dispersion can be formed.

[0083] Table 1 Aqueous dispersion of aniline trimer carboxyl derivative-graphene

[0084] 5mg / 10ml

[0085] good

Embodiment 2

[0086] Example 2 Synthesis of aniline tetramer carboxyl derivatives and graphene aqueous dispersion thereof

[0087] Add 2.0 g of aniline tetramer into 50 ml of THF, and add 0.67 g of succinic anhydride, react at 40° C. for 3 hours, and precipitate with petroleum ether to obtain aniline tetramer carboxyl derivatives. The obtained aniline tetramer carboxyl derivatives and 2 times the molar equivalent of NaOH and graphene are configured into an aqueous solution of a certain concentration, and ultrasonicated for half an hour, the dispersion effect is shown in Table 2. When the concentration of graphene is below 2.5mg / ml Able to form a homogeneous dispersion.

[0088] Table 2 Aniline tetramer carboxyl derivatives-graphene aqueous dispersion effect

[0089] 5mg / 10ml

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Abstract

The invention discloses a graphene dispersant, which comprises electro-active aniline oligomer derivatives. The aniline oligomer derivatives can form [pi]-[pi] complex with graphene. The invention also discloses applications of the graphene dispersant, such as dispersing method and dispersion based on the graphene dispersant, and the like. Conductive aniline oligomer derivatives, which can be easily synthesized and have a low cost, are taken as the graphene dispersant; the dispersant and graphene or other nano carbon materials are simply mixed in a dispersion medium, the dispersion degree, dispersion stability and re-dispersion performance of nano carbon material in the dispersion medium are largely improved; moreover, the physical and chemical properties of the nano carbon materials are not damaged, the operation is simple, and the graphene dispersant is suitable for large scale implementation.

Description

technical field [0001] The invention relates to a graphene dispersing method, in particular to a graphene dispersant and application thereof. Background technique [0002] Graphene is a carbon material with sp2 hybridized carbon atoms interconnected to form a two-dimensional honeycomb lattice structure with a single atomic layer thickness, and has excellent electrical, mechanical, thermal and mechanical properties. The preparation methods of graphene usually include mechanical exfoliation, chemical vapor deposition, oxidation-reduction, solution ultrasonic glass and other methods. Due to the strong π-π interaction of the exfoliated graphene, the graphene sheets are easy to agglomerate together, resulting in limited solubility in organic solvents or water, which greatly limits its application. [0003] In view of this, researchers have proposed various schemes in order to solve these problems. One of the commonly used methods is to add auxiliary dispersants such as surfacta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 余海斌赵海超顾林刘栓马骏丁纪恒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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