Plasma treatment equipment surface modification technology dielectric barrier discharge carbon material modification application:
Plasma is a state of matter generated by matter under high temperature or specific excitation conditions. It is the fourth state in which matter exists in addition to solid, liquid, and gaseous states. Plasma processing equipment is divided into high temperature and low temperature plasma according to the plasma temperature. High-temperature plasma such as the sun, controlled thermonuclear fusion plasma. Low temperature plasma can be divided into hot plasma and cold plasma, hot plasma such as arc, high frequency and combustion plasma, cold plasma such as low pressure glow discharge plasma, corona discharge plasma and dielectric barrier discharge plasma Wait.
Low-temperature plasma processing equipment can be divided into low-pressure low-temperature plasma (such as glow discharge and microwave discharge plasma, etc.) and atmospheric low-temperature plasma (such as corona discharge and DBD plasma, etc.) according to the pressure level. According to frequency, it can be divided into DC discharge, high frequency discharge and microwave discharge plasma.

Low-temperature plasma surface treatment technology can not only change the surface chemistry of carbon materials, but also control the interface physical properties of the materials, and can make obvious changes in the surface composition of carbon materials, showing broad application prospects in the surface treatment of carbon materials. DBD is a large space uniform discharge with glow discharge and high-pressure operation characteristics of corona discharge. It can work at high pressure and a wide frequency range. It is a typical non-equilibrium AC gas discharge.
It can generate large-volume, high-energy-density low-temperature plasma under atmospheric pressure, and can obtain the active particles required for modification at a lower temperature without vacuum equipment. It has special physical processes such as light, heat, sound, and electricity. The chemical process is easy to realize large-scale continuous industrial operation.
The plasma processing equipment DBD plasma is a plasma formed by at least one of the two discharge electrodes being covered by a dielectric, and applying a medium-frequency high-voltage alternating current between the two electrodes, causing the electrode and the medium or the gas between the medium and the medium to produce a discharge breakdown. body.
DBD is a gas discharge in which an insulating medium is inserted into the discharge space. The medium can be covered on the electrode or suspended in the discharge space. There are various design forms of electrode structures. In practical applications, cylindrical electrode structures are widely used in various chemical reactors, while planar electrode structures are widely used in industrial polymers and metal films. The modified grafting of the board, the improvement of surface tension, cleaning and hydrophilic modification are in progress.
The insulating medium plays a very important role in the discharge process. It makes the discharge evenly distributed in the entire discharge space and produces a stable and uniform atmospheric pressure plasma. At the same time, due to the existence of the insulating medium, the wall charge formed during the discharge effectively limits the unlimited growth of the discharge current and avoids the formation of arc discharge or spark discharge under high pressure."
The DBD plasma generated by the inert gas of the plasma treatment equipment does not contain reactive particles. Therefore, when the inert gas DBD is used to modify the surface of the material, the introduction of surface groups is mainly due to the fact that the material after the action of the DBD plasma is placed in the air When the plasma acts on the surface of the material, the macromolecular free radicals are combined with the substances in the air.
The particles in the plasma combine with surface atoms or molecules to generate volatile products. These products volatilize from the surface and cause the plasma to etch on the surface of the material. Plasma treatment equipment modification technology has the advantages of significant effect and no pollution in material surface modification. It is a technology worthy of in-depth study and broad application prospects. Low-temperature plasma material surface modification technology will certainly play an important role in material science research and industrial production.