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Analysis Of Ultrasonic Dispersion Of Graphene In The Matrix
Apr 06, 2018

   

     Due to the excellent properties of graphene, researchers consider adding it as a reinforcement to the matrix material to improve the properties of the matrix material. However, the large specific surface area of graphene tends to agglomerate them together, which not only decreases the adsorption capacity of the graphene, but also affects the performance of the graphene itself, thereby affecting the improvement of the performance of the graphene-reinforced composite material. In order to obtain graphene-enhanced composites with excellent properties, researchers have done some research in overcoming the agglomeration of graphene.

     Graphene is a two-dimensional honeycomb carbon material composed of carbon atoms arranged in a hexagonal pattern. The carbon-carbon atoms are formed by sp2 hybridization and the structure is very stable. The special structure of graphene gives it many excellent properties. Graphene is the highest hardness material currently found, and has excellent mechanical properties, its theoretical specific surface area of up to 2600m2 / g, with outstanding thermal conductivity, up to 3000W / (m · K). In addition, graphene also has good electrical conductivity. At room temperature, its electron mobility can be as high as 20000 cm2/(V·s). Due to the excellent properties of graphene, researchers consider adding it as a reinforcement to the matrix material to improve the properties of the matrix material.

     

    The large specific surface area of graphene often causes them to agglomerate together, which not only decreases the adsorption capacity of the graphene, but also affects the performance of the graphene itself, thereby affecting the improvement of the performance of the graphene-reinforced composite material. Moreover, this reunion is irreversible unless external forces such as ultrasound and strong stirring are dispersed. In order to obtain graphene-enhanced composites with excellent properties, researchers have done some research in overcoming the agglomeration of graphene.

     The specific surface area of graphene makes it prone to irreversible agglomeration in the matrix, which can affect the performance of the graphene reinforcement. In general, graphene has relatively low dispersion performance compared to graphene oxide due to its hydrophobicity and chemical inertness. Therefore, the phenomenon of agglomeration of graphene in the matrix has attracted more and more attention from researchers. Many methods have been tried to overcome the problem of graphene agglomeration. The method of uniform dispersion of graphene in the matrix mainly includes physical dispersion and chemical dispersion. Here, the in-situ polymerization method, functionalization of graphene (covalent functionalization and non-covalent functionalization), and graphite are mainly introduced. Ethylene modification and other modification methods.


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