Cold plasma decontamination using flexible jet arrays

Konesky, Gregory A.

doi:10.1117/12.849943

Cited by 2 publications

(2 citation statements)

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“…However, here, it should also be noted that their device was an array of pinpoint plasma jets with the discharge extending 1.2 cm beyond the device and coming into direct contact with the biofilms. Similarly, other researchers have demonstrated qualitative reductions in planktonic cells using single or multiple plasma jet devices that have direct contact with the contaminated surface [11], [12], [15], [16]. This is in contrast to our device, where the visible discharge plasma does not extend beyond the array of parallel plates; rather, reactive species are carried by the gas flow to the substrate surface.…”

Section: Antimicrobial Activitysupporting

confidence: 41%

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Fabrication and Performance of a Multidischarge Cold-Atmospheric Pressure Plasma Array

Cornell

White

Croteau

et al. 2021

IEEE Trans. Plasma Sci.

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Cold atmospheric-pressure plasma (CAP) has been shown to kill bacteria and remove biofilms. Here, we report the development of a unique CAP array device consisting of a parallel stack of eight linear-discharge plasma elements that create a ∼5-cm 2 (2.4 cm × 2 cm) treatment area. The CAP device is fabricated from low-temperature cofired ceramic (LTCC) layers to create 24-mm-long linear-discharge channels (500-μm gap) with embedded opposing silver metal electrodes. A 20-kHz ac voltage (0.5-5 kV) applied to the electrodes generates an Ar/O 2 plasma between the plates, with the gas flow directing the reactive species toward the biological sample (biofilms and so on) to affect the antimicrobial treatment. External ballast resistors were used to study discharge uniformity in the stacked array elements, and internal thick film ballast resistors (≈150 k) were developed to create a fully integrated device. Typical element discharge currents were 1-2.5 mA with the total array current tested at 20 mA to provide optimal device uniformity. The plasma discharge was further shown to produce reactive hydrogen peroxide and exert antimicrobial effects on Pseudomonas biofilms and Salmonella contaminated eggshell samples, with >99% of the bacterial cells killed with less than 60 s of plasma exposure.Index Terms-Antimicrobial, biofilms, cold atmosphericpressure plasma (CAP), reactive oxygen species. I. INTRODUCTIONM ICROBIAL biofilms and pathogenic contaminants are difficult to remove from surfaces and create significant issues in medical settings [1], [2]. Outside healthcare settings, microbial biofilms are also a serious concern in the food processing industry, where biofilms and microbial

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Section: Antimicrobial Activitysupporting

confidence: 41%

“…1) delivering an Ar/O 2 plasma from a single linear-discharge element could rapidly kill pathogenic E. coli O157:H7 and Staphylococcus aureus cells residing in two-day biofilms established on glass surfaces. However, for large-area treatment, arrays of CAP sources are required [12]- [16].…”

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confidence: 99%