Abstract
In this work, the bacteria inactivation using the nonthermal atmospheric pressure plasma has been studied. The bacteria inactivation was conducted using a self-design nonthermal atmospheric pressure plasma jet system. During this experiment, Escherichia coli was used as an objective microorganism. The primary operating gas for the plasma jet used in this work is helium, and small fractions of oxygen or nitrogen (0.2%) were used as the secondary gas. The three plasma jet cases were operated at 3.5 kV, 14 l/m, and 7 mm, which represented the applied voltage, gas flow rate, and distance from the nozzle, respectively. The types of reactive species have been examined using optical emission spectroscopy. The gas temperature and optical emission spectrum were measured under the same condition. The active species of OH, OII, OI, N21+, N22+, and He are indented in the UV-vis wavelength range. The inactivation of E. coli bacteria has occurred after 20 s of nonthermal plasma treatment, whether the carrier gas is pure helium or helium + nitrogen or helium + oxygen. The results revealed that the impact of helium is less than that of helium + 0.2% nitrogen which is less than that of helium + 0.2% oxygen. The current results of this experiment could be utilized in improving the nonthermal plasma jet for extended surface decontamination.
Highlights
The plasma is defined as a partially or wholly ionized ambiance, representing a blend of numerous chemical substances, ultraviolet radiation, and heat.1 According to the gas temperature, the nonequilibrium plasma can be categorized into the thermal or nonthermal plasma
The plume plasma of the present instrument was explored by ocean optical emission spectroscopy to investigate the behavior of atomic and molecular helium and other constituent species
A nonthermal plasma jet was designed, and a study was conducted to investigate the influence of reactive species on microorganism inactivation
Summary
The plasma is defined as a partially or wholly ionized ambiance, representing a blend of numerous chemical substances, ultraviolet radiation, and heat. According to the gas temperature, the nonequilibrium plasma can be categorized into the thermal (hot) or nonthermal (cold) plasma. The plasma is defined as a partially or wholly ionized ambiance, representing a blend of numerous chemical substances, ultraviolet radiation, and heat.. According to the gas temperature, the nonequilibrium plasma can be categorized into the thermal (hot) or nonthermal (cold) plasma. In the last two decades, various nonthermal atmospheric pressure plasma (NTAPP) designs were examined, which have their application in thermally sensitive substances and biomedical treatments.. Due to the increasingly severe obstacle of emerging antibioticresistant microorganisms, there is an essential requirement for the design and improvement of unique selections to antibiotics. In this opinion, the NTAPP reproduces a vital and useful alternative method in overcoming resistant microorganisms.
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