Ultrasonic dispersion stirring and vibration extraction equipment
Graphene is the world's smallest and hard two-dimensional material composed of single carbon atoms. It has good strength, flexibility, conductivity, heat conduction and optical properties, which plays an important role in various fields. In natural state, there is no single-layer graphene material, which is usually three-dimensional graphite. It is very important to extract single-layer graphene from graphite.
Ultrasonic graphene dispersion is also called ultrasonic graphene stripping. The graphite oxide reduction method can effectively improve the gap between the layers of graphite oxide by using the method of graphite oxide reduction and ultrasonic vibration. The graphite oxide with a large interval is not only conducive to the formation of graphite oxide intercalation composite materials between other molecules and atoms, but also easy to be stripped into single layer graphite oxide, The results provide a basis for further preparation of graphene.
Principle of ultrasonic dispersion stirring and vibration extraction equipment
Ultrasonic graphene dispersion equipment is a kind of particle which can disperse and agglomerate by the cavitation of ultrasonic. It is to put the particle suspension (liquid) to the super sound field and deal with it with the appropriate ultrasonic amplitude. Under the additional effects of cavitation, high temperature, high pressure, micro jet and strong vibration, the distance between molecules will increase continuously, which will eventually lead to molecular fragmentation and form a single molecular structure. The product has good effect on dispersing nano materials (such as carbon nanotubes, graphene, silica, etc.).
Graphene dispersion purpose
There are a lot of graphite materials in nature, and the thickness of 1 mm graphite contains about 3 million layers of graphene. Single layer graphite is called graphene, which does not exist in free state, and all exist in the form of multilayer graphene laminated graphite sheet. Because the interlayer force of graphite sheet is weak, the single-layer graphene with only one carbon atom thickness can be obtained by layer stripping by external force.
Common dispersion methods:
1. micro mechanical stripping
2. chemical vapor deposition
3. epitaxial orientation growth method
4. graphite oxide reduction method
5. ultrasonic assisted method
Graphene oxide was prepared by ultrasonic assisted Hummers method in the ultrasonic graphene dispersion system. It was used as the medium of liquid and added high frequency ultrasonic vibration into the liquid. Because ultrasound is a mechanical wave, it is not absorbed by molecules, which causes the vibration of molecules in the process of transmission. Under cavitation effect, the distance between molecules increases its average distance due to vibration, which leads to molecular fragmentation. The results show that the gap between the layers of the oxide graphite is increasing with the increase of ultrasonic power.
The pressure released by ultrasonic wave breaks down the van der Waals force between graphene layer and layer, making graphene more difficult to unite together. The graphite oxide with a large interlayer spacing is not only conducive to the formation of graphite oxide Intercalation Composites between other molecules and atoms, but also easy to be stripped into single layer graphite oxide, which lays a foundation for further preparation of single-layer graphene.
Ultrasonic graphene dispersion
Ultrasonic dispersion equipment can be used for graphene, ink coating and other dispersing and homogenization treatment; Petroleum emulsification; Extraction and processing of traditional Chinese medicine; Cells, ballast water broken, disinfected; Chemical raw materials accelerated reaction and so on.