What is plasma? The use of plasma


Plasma-the fourth state of matter. Plasma is an ionized gas. Due to the presence of ionized free electrons and charged ions, the plasma has a very high electrical conductivity and has a very strong coupling effect with the electromagnetic field. The plasma is widely used.

What is plasma? Plasma-the fourth state of matter. (Plasma state, plasma, English: Plasma) is an ionized gas. Due to the existence of ionized free electrons and charged ions, plasma has a high electrical conductivity and has a strong coupling effect with the electromagnetic field. The plasma state is It exists widely in the universe and is often regarded as the fourth state of matter (some people also call it "super gaseous state"). The plasma was discovered by Crooks in 1879. The word "Plasma" was written by Langriel in 1928 First adopted.

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How is the plasma generated? When the gas is heated, when its atoms reach thousands or even tens of thousands of degrees Celsius, the electrons will be "flipped" by the atoms, and the atoms become only positively charged ions. At this time, the electrons and ions carry opposite charges, but the number Equivalent, this state is called the plasma state. When people see lightning, meteors, and fluorescent lights all year round, they are in the plasma state. In the vast universe, the plasma state is a ubiquitous state. The universe is large. The internal temperature and pressure of partially glowing planets are very high, and the matter inside these planets is almost in a plasma state.

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Understand the use of plasma

The application of plasma is very, very wide, from nuclear fusion to plasma TV, from plasma film sputtering to industrial waste gas treatment, from plasma cutting and welding to disinfection in biomedical field and so on. The plasma we currently use is focused on plasma surface modification, or plasma surface treatment applications. It is the use of the high energy and unstable characteristics of plasma. When the surface of the solid material is exposed to the plasma, the microstructure, chemical properties, and energy of the surface will change. Plasma surface modification (plasma surface treatment) is to use the characteristics of plasma to clean, activate and activate the surface of the solid material to be treated, so as to achieve the purpose of changing the surface microstructure, chemical properties and energy.




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