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Effects of the electrical excitation signal parameters on the geometry of an argon-based non-thermal atmospheric pressure plasma jet.

Benabbas MT, Sahli S, Benhamouda A, Rebiai S - Nanoscale Res Lett (2014)

Bottom Line: The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values.The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases.This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space.

View Article: PubMed Central - PubMed

Affiliation: Microsystems and Instrumentation Laboratory, Department of Electronics, Faculty of Sciences of Technology, University of Constantine 1, 25017, Constantine, Algeria, m.t.benabbas@gmail.com.

ABSTRACT
A non-thermal atmospheric pressure argon plasma jet for medical applications has been generated using a high-voltage pulse generator and a homemade dielectric barrier discharge (DBD) reactor with a cylindrical configuration. A plasma jet of about 6 cm of length has been created in argon gas at atmospheric pressure with an applied peak to peak voltage and a frequency of 10 kV and 50 kHz, respectively. The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values. The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases. For an applied voltage of 10 kV, the plasma jet diameter decreases from near 5 mm for a frequency of 10 kHz to less than 1 mm at a frequency of 50 kHz. This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space. PACS 2008: 52.50.Dg; 52.70.-m; 52.80.-s.

No MeSH data available.


Plasma jet length and shape variation for different signal frequencies (Vpp = 10 kV).
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Fig5: Plasma jet length and shape variation for different signal frequencies (Vpp = 10 kV).

Mentions: As it is shown in Figure 5, the signal frequency affects significantly the length and the shape of the plasma jet. For an applied voltage of 10 kV at a frequency of 10 kHz, a wide and hallowed plasma jet without the core zone and the tail region was created. As the frequency value increases from 10 to 20 kHz, the plasma jet becomes less hollowed and a bit brighter. At 30 kHz and beyond this frequency value, the plasma jet brightness is more important and the hallowed area decreases until it disappeared completely. The plasma jet becomes thinner and a pinch occurs leading to the formation of the core and the tail regions represented in Figure 2. This change in the plasma jet shape is accompanied by an increase of the plasma jet length as it is reported in Figure 6. Xiong et al.[13] have also reported this dependence of the plasma jet length on the signal frequency variation. Beyond 20 kHz, the plasma jet length increases significantly when the signal frequency is more pronounced. When the applied signal frequency increases from 20 to 50 kHz, the plasma jet length increases from 27 to 42 mm and from 35 to about 63 mm for an applied voltage of 8 and 10 kV, respectively. The diameter of the plasma jet in the core zone is reduced when the signal frequency increases, reaching a value at the middle of less than 1 mm for an applied voltage of 10 kV and a signal frequency of 50 kHz. The tail zone has a diameter slightly greater than that of the core zone. In this region considered as a turbulent region by Xiong et al.[14], the plasma species are less energetic and cannot penetrate deeper in the surrounding air. We have noticed that the length and diameter of this zone can be significantly reduced, until its disappearance, when the applied voltage is decreased from 10 to 6 kV. A thinner plasma jet of a shorter length constituted mainly by the core zone is then obtained. Such size of the plasma jet will be very beneficial for medical application when the treatment must be processed in a reduced space in the human tissue.Figure 5


Effects of the electrical excitation signal parameters on the geometry of an argon-based non-thermal atmospheric pressure plasma jet.

Benabbas MT, Sahli S, Benhamouda A, Rebiai S - Nanoscale Res Lett (2014)

Plasma jet length and shape variation for different signal frequencies (Vpp = 10 kV).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494020&req=5

Fig5: Plasma jet length and shape variation for different signal frequencies (Vpp = 10 kV).
Mentions: As it is shown in Figure 5, the signal frequency affects significantly the length and the shape of the plasma jet. For an applied voltage of 10 kV at a frequency of 10 kHz, a wide and hallowed plasma jet without the core zone and the tail region was created. As the frequency value increases from 10 to 20 kHz, the plasma jet becomes less hollowed and a bit brighter. At 30 kHz and beyond this frequency value, the plasma jet brightness is more important and the hallowed area decreases until it disappeared completely. The plasma jet becomes thinner and a pinch occurs leading to the formation of the core and the tail regions represented in Figure 2. This change in the plasma jet shape is accompanied by an increase of the plasma jet length as it is reported in Figure 6. Xiong et al.[13] have also reported this dependence of the plasma jet length on the signal frequency variation. Beyond 20 kHz, the plasma jet length increases significantly when the signal frequency is more pronounced. When the applied signal frequency increases from 20 to 50 kHz, the plasma jet length increases from 27 to 42 mm and from 35 to about 63 mm for an applied voltage of 8 and 10 kV, respectively. The diameter of the plasma jet in the core zone is reduced when the signal frequency increases, reaching a value at the middle of less than 1 mm for an applied voltage of 10 kV and a signal frequency of 50 kHz. The tail zone has a diameter slightly greater than that of the core zone. In this region considered as a turbulent region by Xiong et al.[14], the plasma species are less energetic and cannot penetrate deeper in the surrounding air. We have noticed that the length and diameter of this zone can be significantly reduced, until its disappearance, when the applied voltage is decreased from 10 to 6 kV. A thinner plasma jet of a shorter length constituted mainly by the core zone is then obtained. Such size of the plasma jet will be very beneficial for medical application when the treatment must be processed in a reduced space in the human tissue.Figure 5

Bottom Line: The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values.The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases.This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space.

View Article: PubMed Central - PubMed

Affiliation: Microsystems and Instrumentation Laboratory, Department of Electronics, Faculty of Sciences of Technology, University of Constantine 1, 25017, Constantine, Algeria, m.t.benabbas@gmail.com.

ABSTRACT
A non-thermal atmospheric pressure argon plasma jet for medical applications has been generated using a high-voltage pulse generator and a homemade dielectric barrier discharge (DBD) reactor with a cylindrical configuration. A plasma jet of about 6 cm of length has been created in argon gas at atmospheric pressure with an applied peak to peak voltage and a frequency of 10 kV and 50 kHz, respectively. The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values. The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases. For an applied voltage of 10 kV, the plasma jet diameter decreases from near 5 mm for a frequency of 10 kHz to less than 1 mm at a frequency of 50 kHz. This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space. PACS 2008: 52.50.Dg; 52.70.-m; 52.80.-s.

No MeSH data available.