Surface charge measurements on different dielectrics in diffuse and filamentary barrier discharges

Tschiersch, Robert; Nemschokmichal, S; Bogaczyk, Marc; Meichsner, Jürgen

doi:10.1088/1361-6463/aa5605

Cited by 54 publications

(52 citation statements)

References 35 publications

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“…For the positive ions in the mixture, the seec is set to 0.1 since that value gives good agreement between the experimental and numerical results. Furthermore, this value lies in the acceptable range as estimated experimentally [60]. The energy of the secondary electrons is set to 5 eV for the helium ions, and 3 eV for the nitrogen and oxygen ions.…”

Section: Input Parameters In the Plasma Fluid Modelmentioning

confidence: 79%

Numerical simulation of capillary helium and helium−oxygen atmospheric pressure plasma jets: propagation dynamics and interaction with dielectric

Lazarou

Anastassiou

Topală

et al. 2018

Plasma Sources Sci. Technol.

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Atmospheric pressure plasma jet (APPJ) can be generated in capillary tubes flowing with pure helium and with admixtures of oxygen into the pure helium. The jet exiting the tube can be used for a variety of applications through surface interaction. In this study, a twodimensional axi-symmetric model has been developed to provide insight into the evolution of capillary helium plasma jet with and without the presence of oxygen admixtures and its interaction with a dielectric surface placed normal to the jet axis. The model considers the gas mixing of helium and ambient air and the analytical chemistry between helium, nitrogen and oxygen species. Experiments were performed in similar conditions as the simulations in order to get qualitative agreement between them. The numerical and experimental results show that the evolution of the helium plasma jet is highly affected by the introduction of oxygen admixtures. In particular, it was observed that the addition of oxygen admixtures in the helium gas promotes plasma bullet propagation on the axis of symmetry of the tube (instead off axis propagation for the pure helium plasma jet). On the other hand, the presence of the dielectric surface (the slab placed in front of the tube exit) forces the plasma bullet to spread radially. Furthermore, the plasma bullet speed decreases when the helium plasma jet is operated in the presence of oxygen admixtures. The numerical results also showed that He/O2 plasma jets induced much higher electric fields on the dielectric surface in comparison to the pure helium plasma jet.

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Section: Input Parameters In the Plasma Fluid Modelmentioning

confidence: 79%

Numerical simulation of capillary helium and helium−oxygen atmospheric pressure plasma jets: propagation dynamics and interaction with dielectric

Lazarou

Anastassiou

Topală

et al. 2018

Plasma Sources Sci. Technol.

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“…Another possible factor is the surface charge accumulated on the dielectric surface, which is largely dependent on the types of dielectric material . Li et al reported that the desorption of the trapped electrons on the dielectric surface can provide seed electrons for the diffuse discharge.…”

Section: Discussionmentioning

confidence: 99%

“…Another possible factor is the surface charge accumulated on the dielectric surface, which is largely dependent on the types of dielectric material. [30][31][32][33][34][35] Li et al [31] reported that the desorption of the trapped electrons on the dielectric surface can provide seed electrons for the diffuse discharge. Radu [36] found that the trapped charge on the dielectric surface reduces the propagation velocity of the discharge across the gap and increases the width of the discharge channel.…”

Section: Figure 16mentioning

confidence: 99%

The influences of the electrode dimension and the dielectric material on the breakdown characteristics of coplanar dielectric barrier discharge in ambient air

Huang

Cheng

et al. 2017

Plasma Processes & Polymers

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The influences of the angle of the V‐shaped electrode, the interelectrode distance, the thickness and the types of dielectric plate on the breakdown characteristics of air coplanar dielectric barrier discharge are investigated. When the angle of the electrode increases, the ignition voltage surprisingly decreases, while both the discharge current, and plasma area remain constant. With smaller interelectrode distance or thinner dielectric plate, lower ignition voltage is required. However, if either one of the them exceeds the threshold value, the discharge mode transits from steady to stochastic. In addition, the discharge appearance in the case of alumina is visually more diffuse with respect to the cases of mica and quartz, which may be caused by the surface charges with high density.

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“…Choosing polyimide with relatively low dielectric constant is under the consideration of the sustainability of flexible plasma sheet. It is reported that when the dielectric barrier permittivity increases in DBD, the discharge becomes more intense and unstable, [22,23] while surface charge density getting higher [24] and chemical reaction efficiency being improved. [25,26] The influence mechanism is explained as the stronger polarization charge in dielectrics with higher permittivity, changing the electric field induced by applied voltage, space, and surface charge.…”

Section: Methodsmentioning

confidence: 99%

Polyimide‐Based Flexible Plasma Sheet and Surface Ionization Waves Propagation

Sun

Zhang

Wang

et al. 2021

Adv Elect Materials

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demands of treating complex 3D targets and irregular surfaces. Typical DBDs can hardly satisfy these requirements due to the narrow discharge gap and the rigid dielectric material. Thus it is of great significance to develop a specific plasma source which not only has the characteristics of high surface-compatibility and large-area coverage, but also maintains light, convenient and economical. The emergence of DBD plasma source using flexible material instead of the rigid one as the dielectric barrier provides a new way to solve this problem.Preliminary studies have been carried out focusing on manufacturing techniques and application effects of flexible plasma sources. Readle et al. [5] designed a flexible microcavity array plasma source which was fabricated from two bonded sections of Al mesh and used nanoporous alumina as an integral dielectric barrier, whose thickness was less than 100 µm, with microcavities reaching 50 µm in diameter. When bending the plasma source during the experiment, the characteristics of discharge current were almost unchanged, but the brightness of the curved array was only about 1/2 compared to the planar one. Another study reported by Cho et al., [6] in which the flexible plasma source used polyimide as dielectric barrier, showed that increasing the excitation voltage or reducing the thickness of the dielectric barrier would enhance the intensity of the discharge, leading plasma to diffuse from the edge of high-voltage electrode to the center gradually. There is also study reported in which the flexible plasma source was optimized to achieve a minimum displacement current and a maximum dissipated power. [7] In terms of application, flexible DBD plasma sources have shown remarkable effects in their use to microorganism inactivation, [8,9] wounds healing, [8,10] enhanced chemical deposition, [11] and hydrophilic or hydrophobic modification. [12] For example, after a 10-min treatment with the flexible plasma source, the microbial-load reductions of Listeria monocytogenes, Escherichia coli O157:H7, and Salmonella Typhimurium were around 2 to 2.5 Log CFU g −1 in the samples respectively. [9] The flexible plasma source reported in reference [12] could be manufactured within 30 min and with a cost of less than 0.25 USD. The properties of being highly efficient and economical, together with unique surface-compatibility, make flexible plasma source a promising device for a more comprehensive application of non-thermal plasma. However, current Surface discharges on flexible substrates are attracting attention for their unique capability to generate large-scale non-thermal plasma and potential adaptability to complex objects in many fields, like biomedical inactivation and material processing. Two fundamental issues are manufacture of stable flexible plasma sources and mechanism of multiple surface ionization waves (SIWs) propagation on curved gas-solid interfaces. A polyimide-based flexible plasma sheet is realized through printed circuit board with a non-exposed electrode structure for disch...

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Surface charge measurements on different dielectrics in diffuse and filamentary barrier discharges

Cited by 54 publications

References 35 publications

Numerical simulation of capillary helium and helium−oxygen atmospheric pressure plasma jets: propagation dynamics and interaction with dielectric

Numerical simulation of capillary helium and helium−oxygen atmospheric pressure plasma jets: propagation dynamics and interaction with dielectric

The influences of the electrode dimension and the dielectric material on the breakdown characteristics of coplanar dielectric barrier discharge in ambient air

Polyimide‐Based Flexible Plasma Sheet and Surface Ionization Waves Propagation

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