Abstract
The interaction of an atmospheric pressure plasma jet with different dielectric surfaces is investigated using a setup of two ring electrodes around a ceramic capillary. In this study, in addition to electrical measurement methods such as the determination of voltage and current, special emphasis was placed on the power measurements at the electrodes and the effluent. The power dissipation is correlated with Fourier-transform infrared (FTIR) absorption spectroscopy measurements of O3 and NO2 densities. The results show the correlation between the dielectric constant and the dissipated power at the target. The ratio between power dissipation at the grounded ring electrode and the grounded surface shows an increase with increasing dielectric constant of the target. A correlation of the results with bacteria, tissue and water as envisaged dielectric targets shows four times the power dissipation at the treatment spot between bacteria and tissue.
Highlights
Plasma devices operating at atmospheric pressure are a useful tool for many applications, from exhaust treatment to medical use [1,2,3]
Cold atmospheric pressure plasma is found to inactivate a broad spectrum of microorganisms in wounds and to stimulate cell proliferation and tissue regeneration mediated by direct treatment via ultraviolet radiation and creation of reactive species or by indirect effects through excitation of the liquid phase of the cell or wound [8]
This could impact the effectivity of the device, since an increase or decrease in power dissipation scales with the production of e.g., ions, emission or reactive species and thereby the impact on a surface
Summary
Plasma devices operating at atmospheric pressure are a useful tool for many applications, from exhaust treatment to medical use [1,2,3]. The unique properties of the devices arise from the local generation of multiple reactive species on the spot [4]. A broad range of investigations consider the application of plasma treatment of surfaces aiming to coat, decontaminate or heal specific surfaces. One major application for plasma being researched is the field of plasma medicine. Cold atmospheric pressure plasma is found to inactivate a broad spectrum of microorganisms in wounds and to stimulate cell proliferation and tissue regeneration mediated by direct treatment via ultraviolet radiation and creation of reactive species or by indirect effects through excitation of the liquid phase of the cell or wound [8]
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