ABSTRACT
During the COVID-19 pandemic, the prevailing method for inactivating samples used in nucleic acid detection is a time-consuming process that involves heating the samples in a thermostatic water bath at 56 <inline-formula> <tex-math notation="LaTeX">$
ABSTRACT
The recent end of the coronavirus epidemic has raised awareness of the importance of environmental hygiene. There are a number of ways in which the environment can be disinfected. There are chemical and physical processes to reduce the amount of airborne pathogens. One of the most effective disinfection methods is to increase the ozone content of the air, i.e.To kill viruses with ozone. In this article, we give an example of this. Here, ozone is generated by means of a corona discharge and the intensity of the ozone and the time of ozone generation are adjusted and controlled by means of the procedure and the device presented. (Figure 1) © 2022 IEEE.
ABSTRACT
Ozone is a highly effective and broad-spectrum non-residual gas disinfectant.The global COVID-19 pandemic has significantly affected public safety and health, and low concentrations of ozone can inactivate the novel coronavirus.The negative ion generator is a safe and efficient method to generate ozone.Through corona discharge on the needle plate, an ion current can be formed between the needle-plate electrodes and a certain concentration of ozone can be released.In the research on the relationship between the electrode-to-plate distance and ozone release in the negative ion generator, different experimental observations show contradictory results, making the theoretical explanation very difficult and complicated.As the needle-to-plate electrode distance increases, the continuous exponential decreasing trend of ozone emission rate changes to a non-continuous step-wised decreasing pattern, which is defined as the Quantum Ozone Emission Effect (QOEE).The QOEE was observed in all negative ion generators when the plate material was aluminium, stainless steel, yellow brass, or copper.The observed quantum ozone emission effect in negative ion generators may be related to the gas ionization potential of the oxygen molecule and to the electron avalanche theory.The quantum effect of ozone emission is a manifestation of the quantum behavior of the microscopic electron world in the macroscopic world.The ozone emission quantum effect provides a novel technical method for measuring the microscopic properties and corona discharge characteristics of materials. © 2022, Editorial Department of Journal of Xidian University. All right reserved.
ABSTRACT
The COVID-19 caused by the novel coronavirus is still spreading globally, and blocking its airborne transmission route is of great significance to control the pandemic. The conventional plasma air disinfection devices show advantages in their dynamic and rapid capabilities, but the disinfection performance is limited by a single method, besides, there exists the risk of secondary infection during maintenance. In this work, according to the physiological characteristics of the novel coronavirus, an air disinfection device based on thermally coupled corona discharge was proposed for the improvement of conventional plasma air disinfection technology, which adopted the wire-plate array electrode structure to initiate corona discharge, and utilized heating wires embedded in the collection plate to achieve centralized heating. The discharge para-meters were measured, and a discharge power at stable operation was discovered to be as high as 5.6 W, for which the discharge law was found to obey the Townsend relationship. Measurement and simulation of the thermal parameters showed that, compared with the overall air heating, the efficiency of centralized heating was increased by 17 times, with minimal impact on the ambient temperature. Bacillus amyloliquefaciens and Bacillus subtilis bacteriophages were used as model bacteria and virus to verify the disinfection performance. Results demonstrate that the killing performance is effectively enhanced via thermally coupled corona discharge, with a removal rate of residual virus on the collection plate increasing by 99.97%, thereby reducing the risk of secondary infection. This work lays a device foundation for killing the airborne novel coronavirus, and also provides a technical reference for cutting its airborne transmission. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.