Plume images of the torch plasmas with the airflow rates of 0, 0.393, and , respectively.
Emission spectrum of the microwave plasma torch; the airflow rate is and the line of sight of measurement is at 2 cm above the surface of the waveguide.
(a) Schematic of the experimental setup for biological decontamination and (b) a photo of the setup with the torch running.
Processed image from biological decontamination experiment: CFU formation after 14–16 h of incubation (marked by red arrows).
CFU formation after decontamination using plasma torch at several distances (3, 4, and 5 cm) and exposure times (2–12 s).
BC kill curves: data points are obtained by placing samples at three exposure distances of , , and from the nozzle of a microwave plasma torch. Results are compared with BG kill curves reported in Ref. 19 using APPJ (dash line) and hot gas (dot line).
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