Abstract
While numerous experiments have demonstrated the efficacy of high voltage cold atmospheric pressure plasmas (HVCAPs) in sealed packages for microbial inactivation, the influence of the package on the emitted species measured during HVCAP discharge is poorly understood. This study elucidates the impact of the package on plasma generation in sealed packages for four separate gases (ambient air, commercial grade compressed air, a helium/air mixture, and nitrogen) placed in commercially available transparent plastic containers and bags representative of the materials used in the food industry. The container and bag individually reduced emission signal intensity by an average of 63 and 45%, respectively, across the measured wavelengths of 200–1100 nm, demonstrating that they acted as broadband absorbers. Neither the container nor bag caused additional emission lines to appear, indicating no significant effect on the types of species generated. Considering the minimum applied voltage necessary to induce a discharge, the power dissipated by the nitrogen and ambient air plasma generated at 72 ± 3.7 kV RMS were comparable to the compressed dry air discharge generated at 80 ± 3.7 kV RMS. The helium discharge at 37 ± 3.7 kV RMS absorbed approximately 92% more power than these gases. Rotational temperatures ranged from 285 K for helium to 479 K for compressed air. These results indicate that the package impacts the intensity distribution but not the presence of the most dominant peaks, although further studies are required to elucidate the impact on less intense peaks.
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Brayfield, R.S., Jassem, A., Lauria, M.V. et al. Characterization of High Voltage Cold Atmospheric Plasma Generation in Sealed Packages as a Function of Container Material and Fill Gas. Plasma Chem Plasma Process 38, 379–395 (2018). https://doi.org/10.1007/s11090-018-9872-8
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DOI: https://doi.org/10.1007/s11090-018-9872-8