Principle and application of ultrasonic graphene dispersion system
Graphene is a thin and hard two-dimensional material composed of a single layer of carbon atoms. It has good strength, flexibility, electrical conductivity, thermal conductivity and optical properties, and plays an important role in various fields. There is no single-layer graphene in its natural state. Generally speaking, it exists in three-dimensional graphite. It is very important to extract single-layer graphene from graphite.
Ultrasonic graphene dispersion is also called ultrasonic graphene peeling. The graphite oxide reduction method combined with ultrasonic vibration can effectively increase the graphite oxide layer spacing. Graphite oxide with a large interlayer spacing is not only beneficial to the intercalation of other molecules and atoms to form a graphite oxide intercalation composite material, but it is also easy to exfoliate into a single-layer graphite oxide to lay the foundation.
Principle of ultrasonic graphene dispersion
Ultrasonic graphene dispersion equipment uses ultrasonic cavitation to disperse agglomerated particles. It is to place the particle suspension (liquid) to be processed in a relatively strong sound field and process it with appropriate ultrasonic amplitude. Under the action of additional effects such as cavitation, high temperature, high pressure, micro jets, strong vibration, etc., the distance between molecules will continue to increase, causing the molecules to fragment and form a single molecular structure. This product is particularly effective for dispersing nanomaterials (such as carbon nanotubes, graphene, silica, etc.).
The purpose of graphene dispersion
There are a lot of graphite materials in nature. 1mm thick graphite contains about 3 million layers of graphene. Single-layer graphite is called graphene. It does not exist in a free state, but in the form of multilayer graphene sheets. Due to the weak interlayer force, the graphene can be peeled off layer by layer under the action of external force to obtain a single-layer graphene with a thickness of only one carbon atom.
Ultrasound assisted method
In the ultrasonic graphene dispersion system, the ultrasonic-assisted Hummers method is used to prepare graphene oxide. Since ultrasound is a mechanical wave, it is not absorbed by molecules and causes molecular vibration during propagation. Under the cavitation effect, that is, under the additional action of high temperature, high pressure, micro jets and strong vibration, the average distance between molecules increases due to vibration, which leads to molecular fragmentation. As the ultrasonic power increases, the graphite oxide layer spacing increases.
The pressure released by ultrasound breaks the van der Waals force between graphene layers, making it more difficult for graphene to reunite. Graphene intercalation is easy to prepare through intercalation and intercalation.
Ultrasonic dispersion equipment can be used for graphene, ink, paint dispersion, homogenization, petroleum emulsification, Chinese medicine extraction and processing, cell crushing, ballast water crushing, disinfection treatment, accelerated reaction of chemical raw materials, etc.