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Atmospheric pressure air-plasma jet evolved from microdischarges: Eradication of E. coli with the jet
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic presentation of the atmospheric-pressure air-plasma jet device with the porous alumina dielectric. The inset is a photograph of the 5 SLM air-plasma jet.

Image of FIG. 2.
FIG. 2.

(a) Photographs showing the evolution of discharges from the filamentary channels to the plasma jet. The outer electrode in Fig. 1 was replaced with a mesh electrode. (b) Plot of the airflow rate vs the plasma jet length. The inset shows pictures of plasma jets with different airflow rates.

Image of FIG. 3.
FIG. 3.

Voltage and current waveforms of the air-plasma jet at different input power levels. (a) Before discharge. (b) and . (c) and . (d) and .

Image of FIG. 4.
FIG. 4.

Plot showing gas temperatures measured at different axial positions of the plasma jet.

Image of FIG. 5.
FIG. 5.

Optical emission spectrum of the plasma jet at 5 SLM of air, showing excited plasma species related to different types of molecular and atomic nitrogen, and atomic oxygen.

Image of FIG. 6.
FIG. 6.

Plot of log vs the plasma exposure time, where is the average control colony’s number and is the viable colony’s number. The data points marked with triangle represent sterilization of E. coli cells by airflow at .


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Scitation: Atmospheric pressure air-plasma jet evolved from microdischarges: Eradication of E. coli with the jet