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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 variation versus the electrode setup (Vpp = 10 kV;f = 50 kHz). (a) Inner electrode grounded and (b) outer electrode grounded.
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Fig3: Plasma jet length variation versus the electrode setup (Vpp = 10 kV;f = 50 kHz). (a) Inner electrode grounded and (b) outer electrode grounded.

Mentions: A minimum value of about 6 kV is required to produce a stable plasma jet. Its length is dependent on the electrode setup. When the outer electrode was grounded, the plasma jet length reaches more than 60 mm, and when the grounded electrode was the inner one, the plasma length reaches only a few millimeters. Figure 3 shows clearly this behavior of the plasma jet for an applied voltage of 10 kV and a signal frequency of 50 kHz. These results are similar to those found by Shao et al.[10] on a plasma jet created in Ar gas by applying a voltage of 7.5 kV with a signal frequency of 17 kHz. The variation in the plasma jet behavior observed when the electrode arrangement is changed may be due to a difference between the amounts of the accumulated charges generated by the plasma discharge between the two electrodes. At the active electrode, the applied potential varies with time leading to an accumulation of charges during the first half period of the applied voltage and to an accumulation of the opposite type of charges during the next half period. These charges compensate the first ones, occurring then a partially or completely neutralizing charge process at this electrode. In contrary, as at the ground electrode the potential is fixed, an important amount of charge accumulated on the inner surface of the dielectric barrier (quartz tube), underneath this electrode, creating then a charge overflow. This charge overflow beyond the ground electrode leads to the development of a self-biasing voltage in this region. This promotes the charged species movement along the axis of the gas flow from the active electrode to the ground electrode and ignites plasma beyond the ground electrodes; an extensive glow discharge is created in this area and a more pronounced plasma jet length than that observed when the active electrode is the outer one is then obtained.Figure 3


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 variation versus the electrode setup (Vpp = 10 kV;f = 50 kHz). (a) Inner electrode grounded and (b) outer electrode grounded.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig3: Plasma jet length variation versus the electrode setup (Vpp = 10 kV;f = 50 kHz). (a) Inner electrode grounded and (b) outer electrode grounded.
Mentions: A minimum value of about 6 kV is required to produce a stable plasma jet. Its length is dependent on the electrode setup. When the outer electrode was grounded, the plasma jet length reaches more than 60 mm, and when the grounded electrode was the inner one, the plasma length reaches only a few millimeters. Figure 3 shows clearly this behavior of the plasma jet for an applied voltage of 10 kV and a signal frequency of 50 kHz. These results are similar to those found by Shao et al.[10] on a plasma jet created in Ar gas by applying a voltage of 7.5 kV with a signal frequency of 17 kHz. The variation in the plasma jet behavior observed when the electrode arrangement is changed may be due to a difference between the amounts of the accumulated charges generated by the plasma discharge between the two electrodes. At the active electrode, the applied potential varies with time leading to an accumulation of charges during the first half period of the applied voltage and to an accumulation of the opposite type of charges during the next half period. These charges compensate the first ones, occurring then a partially or completely neutralizing charge process at this electrode. In contrary, as at the ground electrode the potential is fixed, an important amount of charge accumulated on the inner surface of the dielectric barrier (quartz tube), underneath this electrode, creating then a charge overflow. This charge overflow beyond the ground electrode leads to the development of a self-biasing voltage in this region. This promotes the charged species movement along the axis of the gas flow from the active electrode to the ground electrode and ignites plasma beyond the ground electrodes; an extensive glow discharge is created in this area and a more pronounced plasma jet length than that observed when the active electrode is the outer one is then obtained.Figure 3

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.