RT Journal Article
ID 47feca8a1e434cea
A1 Benova, Evgenia
A1 Atanasova, Mariana 
A1 Bogdanov, Todor 
A1 Marinova, Plamena 
A1 Krcma, Frantisek
A1 Mazankova, Vera 
A1 Dostal, Lukas 
T1 Microwave Plasma Torch at a Water Surface
JF Plasma Medicine
JO PMED
YR 2016
FD 2016-09-30
VO 6
IS 1
SP 59
OP 65
K1 atmospheric pressure plasma torch
K1 biomedical plasma applications
K1 low-temperature plasma
K1 microwave discharge
K1 plasma-water interaction
AB An argon plasma torch sustained by a 2.45-GHz electromagnetic wave can be in contact with a water surface or can penetrate inside the water, depending on the wave power. The propagation of the electromagnetic wave sustaining the discharge in water is problematic because the water relative dielectric permittivity greatly depends on the wave frequency and the temperature and varies between 6 and 86. At a wave frequency of 2.45 GHz and room temperature (20°C) the dielectric permittivity is 80, which leads to the very fast decay of the electromagnetic wave. We have studied both theoretically and experimentally the plasma properties and the electrodynamics of the wave propagation when the gas discharge is in contact with water. Depending on the wave power and the gas flow, it is possible to produce plasma at a low (room) temperature. The plasma is in nonequilibrium, with the electron temperature much higher than the gas/ liquid temperature. Because of this, many radicals and chemically active particles can be produced even at low temperatures. Depending on the operating conditions, this kind of discharge can have various applications in surface treatment, sterilization, and surface energy change, among others, including temperature-sensitive materials and liquids treatment.
PB Begell House
LK https://www.dl.begellhouse.com/journals/5a5b4a3d419387fb,2cf1e1a94009b3e1,47feca8a1e434cea.html