Method for coating magnesia with graphene

Abstract

The invention relates to a method for coating magnesia with graphene. The method comprises the following steps: (1) adding a certain amount of graphite oxide into a proper amount of deionized water, carrying out ultrasound treatment for 1-2 hours so as to obtain a 0.1mg / ml-2mg / ml uniformly dispersed graphene oxide water solution; (2) adding magnesia hexahydrate with the molar mass equal to 0.5-5 times that of graphene oxide into the solution of the step (1), carrying out ultrasound treatment for 10-30 minutes, so as to obtain a relatively uniformly dispersed mixed solution; (3) adding the mixed solution obtained in the step (2) into a water bath boiler of 30-80 DEG C, stirring at the velocity of 100rmp, simultaneously dropwise adding a 0.5mol / ml-1mol / ml ammonia water solution into the mixed solution at the velocity of 0.1ml / min-10ml / min, and stopping the dropwise adding of the ammonia water solution after the pH value is stabilized at 9.0; (4) filtering and drying precipitates obtained in the step (3), so as to obtain a precursor coating magnesia and graphene; and (5) sintering the precursor obtained in the step (4) at 500-600 DEG C for 2-4 hours in the presence of argon, so as to obtain graphene coating magnesia. According to the method, a coating process is simple, efficient, low in cost, environmentally friendly and applicable to large-scale production.

Description

technical field [0001] The invention relates to a preparation method of graphene-coated inorganic functional materials, and belongs to the technical field of preparation methods of advanced nanocomposite materials. Background technique [0002] Graphene (Graphene) has excellent electrical, thermal and mechanical properties, and is currently the most ideal two-dimensional nanomaterial. Since British physicists Andre Heim and Konstantin Novoselov successfully stripped graphene from graphite in 2004, it has been widely used in chemical engineering, materials and medicine because of its excellent physical and chemical properties. and other fields have very important application prospects. However, similar to carbon nanotubes, graphene is very easy to agglomerate due to its unique small size effect and surface effect, as well as its own strong van der Waals force, resulting in uneven dispersion in the composite material matrix; on the other hand, the graphene surface With stron...

AI Technical Summary

Problems solved by technology

However, similar to carbon nanotubes, graphene is very easy to agglomerate due to its unique small size effect and surface effect, as well as its own strong van der Waals force, resulting in uneven dispersion in the composite material matrix; on the other hand, the graphene surface With strong hydrophobicity and chemical inertness, they have poor compatibility with many matrix materials, and the interface strength of composite materials is low

This has seriously affected the application of graphene in chemical industry, materials and other fields.

At present, surface modification of graphene is one of the methods to solve this problem, such as coating silicon carbide, silicon dioxide, etc. Although these surface modification processes improve the dispersion of graphene in the matrix to a certain extent, but In the process of compounding with the matrix, it is easy to cause damage to the graphene structure, making it difficult for graphene to exert its superior comprehensive physical and chemical properties.

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