Graphene suspension solution and preparation method thereof

Abstract

The invention discloses a graphene suspended solution and a making method thereof, the method comprises the steps of dispersion solution preparation, addition, stripping and separation, the dispersion solution preparation step is as follows: preparing a dispersion solution with the surface tension of 35-55mJ / m<2>, the addition step is as follows: adding a graphite powder material into the dispersion solution to obtain a graphite mixed solution with the concentration of 0.01-5g / L, the stripping step as follows: mechanically separating the graphite powder material into monolayer graphene, and suspending the stripped monolayer graphene into the dispersion solution to form an initial suspension solution, and the separation step is as follows: centrifuging the initial suspension solution to separate the parts which cannot be stripped from the initial suspension separation to obtain the graphene suspended solution with the surface potential greater than 30mV or less than-30mV; and by control of the surface tension, the monolayer graphene can be suspended and dispersed in the solution, the monolayer graphene aggregation problem in the prior art can be overcome.

Description

technical field [0001] The invention relates to a graphene suspension solution and a preparation method thereof, in particular to controlling the surface tension of the solution so that the graphene can be fully dispersed in the solution. Background technique [0002] Single-layer graphite, also known as graphene, is a two-dimensional honeycomb lattice structure in which a single layer of carbon atoms is tightly packed with graphite bonds (sp2), so it is only one carbon atom thick and graphite bonds It is a compound bond of covalent bond and metal bond, which can be said to be the perfect combination of insulator and conductor. In 2004, Andre Geim and Konstantin Novoselov of the University of Manchester in the United Kingdom successfully used adhesive tape to peel off graphite, confirming that a single layer of graphene can be obtained, and won the 2010 Nobel Prize in Physics. [0003] Graphene is currently the thinnest and hardest material in the world. Its thermal conduct...

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Problems solved by technology

Regardless of the method used to prepare graphene powder, due to the innate nanostructure of graphene, not only the preparation method is complicated and the pollution is serious, but also the bulk density of nanomaterials is very low. For graphene, its bulk density is far less than 0.01g / cm 3 , that is, it is bulky, and it is easy to generate a large number of agglomerations due to van der Waals force. Even with excellent physical properties, it is a very difficult problem for mass production and even industrial applications. Not only is it difficult to play its properties, Even cause negative effects of derivative products

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