483. Realizing high efficiency and large-area sterilization by a rotating plasma jet device

Fig. 1 Model drawing of rotatable plasma device: (a) three-dimensional model of the device, (b) schematic diagram of scanning mode and (c) schematic diagram.

Fig. 2 Rotatable plasma sterilization device: (a) photograph of the device and (b) sterilization working diagram at different angles.

Table 1 Comparison of rotary and array sterilization performance.

Hua Li, et al, Plasma Sci. Technol. 24, 045501 (2022)
https://doi.org/10.1088/2058-6272/ac550d

(1) The treatment area of a cryogenic-plasma jet is only a few square millimeters. Several small-scale jets form a basic unit arranged in parallel to produce a large-area plasma, known as a jet array.
(2) The array jet often has the problems of uneven irradiation and unstable sterilization.
(3) An AVASSPE-ULS3648 fiber optic spectrometer was used to measure the emission spectrum of the plasma from the rotatable plasma jet device. The principle of emission spectroscopy in the context of a plasma is to establish and comprehend the properties of the plasma using the plasma emission or absorption spectra.
(4) The plasma produced by a rotating plasma jet emitter consists of OH free radicals, N2, N2+, He, and O, and contains many active particles, which is one condition for high efficiency sterilization.
(5) The sterilization area of E. coli is larger than that of S. aureus, on the whole, which is in accordance with E. coli being a gram-negative bacterium with thinner cell walls than S. aureus and is in accordance with E. coli being easier to activate.
(6) Existing array devices often suffer from uneven sterilization capabilities and considerable gas consumption. To solve this problem, a rotating plasma injection device was designed.