Atmospheric plasma

What is a Plasma ?

Bringing more and more energy to matter modifies its original states : from solid to liquid, then from liquid to gas. Adding even more energy lead to ionization phenomena. Gas atoms and molecules are split into excited, charged and energetic  particles like ions, radicals and free electrons. When all the particles have the same energy ( thermodynamic equilibrium) the plasma is considerd as "hot". If the electrons has a higher energy than the ions, the plasma is "cold". This particular state appears under specific conditions  like low pressure or using HF voltages and allows chemical reactions to occur at low temperature. Cleaning,deposition, functionalization process are possible using the higly energetic electrons at room temperature. 

Plasma is sometimes considered as "the fourth state of matter".    

 

Generating a plasma under atmospheric pressure

Atmospheric plasmas are generally produced by creating electrical discharges in air between two electrodes situated in the torch chamber. The plasma is then  blown away using an a high gas flow  and is directed towards the surface to be treated.  The Ionjet technology is radicaly different as the plasma is created by a microwave antenna outside the torch for more efficiency and new applications

Effect on surfaces

Atmospheric plasma torch is like  a continuous flow of  highly reactive chemical species. The technology allows to clean, activate and functionalize surfaces of any kind. Wettability is enhanced and higher surface cleanliness reached.