بناء منظومة البلازما الضغط الجوي الغير حرارية للتطبيقات الطبية الحيوية == Construction of Non - thermal Atmospheric Pressure Plasma System for Biomedical Applications
Author name:
علي فاضل محمد هاشم
Supervisor name:
فاضل خدام فليفل | محمد خماش خلف
General topic:
Physics
Specific topic:
Plasma Physics
Degree:
Master
University:
University of Kerbala - College Of Science - Physics Department
Language:
English
University location:
Karbala
First pages:
26T1608 - p.pdf
Abstract:
Recently, the atmospheric pressure non - thermal plasma has attracted great attention in biomedical applications due to the advantages of high e ciency, safety, no toxic residue and low cost. In this work, a homemade plasma jet system was constructed. The system which used in this work was a dielectric barrier discharge (DBD) type atmospheric pressure plasma jet (APPJ). It was applied to generate a non - thermal plasma using an alternating current (AC) power supply (providing voltages up to 7.5 kVp????p and frequencies up to 12 kHz) with two types of noble gases (argon and helium). The system was based on two electrodes con guration, where the rst con guration based on ring - to - plate electrodes structure and the second on double - ring electrodes structure. Each con - guration used two types of Pyrex tube with wall thickness of 3 mm and 0.95 mm. It was found that the ring - to - plate electrodes structure with tube wall thickness of 3 mm generate plasma at high temperature (48.5 C) while, the plasma temperature decreased to 46 C when thetube wall thickness reduced to 0.95 mm. In contrast, the double - ring electrodes structure did not generate plasma when using a tube with wall thickness of 3 mm but, when the tube wall thickness reduced to 0.95 mm, plasma generated at low temperature (34.5 C). The electrical characteristics was investigated to describe the discharge of the argon and helium plasma jets. It was found that the ignition voltage for the helium plasma (4 kVp????p) was lower than the ignition voltage for the argon plasma (4.7 kVp????p). Also through the current discharge, it was con rmed that the plasma system safe and prevents any arcing.The in uence of the higher gas ow rate lead to increase of the plasma plume length and reduction of the plasma jet temperature. The maximum plume length of argon plasma was 23 mm and the temperature at this length was 34 C under the system conditions of 12 kHz, 7.5 kVp????p and gas ow rate of 4 standard litre per minute (slm). In contrast, the maximum plume length of helium plasma was 44 mm and the temperature at this length was 27 C under the same system conditions.The plasma jet was diagnosed by optical emission spectroscopy (OES) to calculate the electron temperature (Te) and density (ne). As well, the presence of active species such as reactive oxygen and nitrogen species (RONS) was con rmed by OES. The lines intensity of the active speciesfor argon and helium plasma jets showed variations in quantity and qual -
