Research On Dispersion Of Graphene In Aqueous Solution And Concrete

Graphene sheet has carbon atomic structure of the monolayer or multilayer atomic thickness. The c-c in the graphene sheet is combined by sp2. It forms the serried and cellular crystal structure. Because the graphene has the special two-dimensional carbon nanostructures, it has the excellent physical, chemical and electrical properties. The grapheme has many application areas. Using the excellent properties can make the better composite material. Especially when the graphene is mixed into the ceramic matrix composite, it can improve the mechanical properties and electrical properties of ceramics. But the graphene is easy to reunite and it’s hard to evenly disperse in the matrix. So the disadvantages limit the development of the graphene.There is serious electromagnetic pollution in the modern society. The absorbing material is benefit to preventing the electromagnetic pollution. So it has important practical significance if people study and develop the absorbing material. Graphene has the advantage of light quality, mechanical performance and good electrical performance, etc. Graphene will be a good kind of the absorbing material, using the graphene ceramic matrix composites as the absorbing layer of the absorbing composite materials and adopting stratified gradient design to reduce the reflection of electromagnetic waves can improve the absorption properties.Graphene is prepared by oxidation-reduction method:It use improved Hummers to make the graphite oxide. And then it makes the hydrazine hydrate restored to get the graphene. Analyzing the SEM、TEM、FT-IR and TG-DSC of graphite oxide and graphene and then researching its morphology, structure and thermal property can make a decision. The decision is that the graphene made by this way have the good electrical properties. The electric conductivity is3.45×105S/m. It analyses the different kinds of the surfactants such as CTAB, SDBS and PVP make different dispersion effects on the graphene in the aqueous solution. When the mass fraction of PVP is30%, the absorbance of the graphene turbid liquid is the maximum. It means that PVP makes the best dispersion effects on the graphene in the aqueous solution. The way that the graphite oxide deoxidizes in the alkaline copper mixture to get the graphene makes the graphene disperse equally in the copper oxide substrate. And making the copper oxide restore can get the multifunctional composite of the graphene and copper nanoparticle. This composite can be used in solar cell and treatment of the automobile exhaust. Using the SDBS can let the wetting graphene disperse equally in the epoxy resin. It can be used in making the electromagnetic shielding material. Comparing the composite powder made by the blending method and in-situ synthesis method can get two conclusions. The particles of graphene/alumina composite powder made by the blending method are big and conglobated. The particles of graphene/alumina composite powder made by the in-situ synthesis method are small and disperse equally in the matrix. It is the good choose of making the composite absorbing material.