what is graphene
Graphene is one of the materials with the highest strength known. At the same time, it has good toughness and can be bent. The theoretical Young's modulus of graphene is as high as 1.0 tpa, and its intrinsic tensile strength is 130 GPa. Graphene paper made from graphene sheets has a number of pores that make it brittle. When the functionalized graphene is oxidized and made of functionalized graphene, the graphene paper is exceptionally strong and tough.
Graphite oxide was added to a certain concentration of lye and dispersed into graphene oxide colloid solution by ultrasound. Excessive chloroacetic acid was added to convert the hydroxyl and epoxy groups on graphene oxide into carboxyl groups. Homogeneous carboxylated Go solution was obtained. Carboxy-modified Go plays an important role in the preparation of functionalized Go. Various organic small molecules, macromolecules, biomacromolecules and functional materials containing reactive groups can be covalently bound to go by using the active carboxyl groups on the surface of go through amideation or esterification reaction.
Both hydroxylated and carboxyl fossil inks belong to functionalized graphene.Generally, graphite and alkali metal solids are used for continuous ball grinding in high-energy ball mills. Low-frequency and high-voltage pulse current is applied to the graphene dispersed in water to obtain water-soluble graphene containing only hydroxyl groups. Hydroxyl fossil inks show greater affinity to polar molecules such as water.