scholarly journals Ar plasma jet generation and its application for water and surface sterilization

2019 ◽  
Vol 78 ◽  
pp. 02020
Author(s):  
Fada Feng ◽  
Xianjun He ◽  
Yingying Liang ◽  
Fengzhu Yang ◽  
Fushan Wang ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Gas Flow ◽  
Barrier Discharge ◽  
Infrared Image ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Living Environment ◽  
Dielectric Barrier ◽  
Surface Sterilization ◽  
Ar Plasma

Microorganisms are widely distributed in the living environment of human, animals and plants. Some of the microorganisms are harmful for their pathogenic effects. Non-thermal plasma technology, especially, the atmospheric pressure plasma jet, is considered to be one of the promising technologies for sterilization. This work proposes a double-dielectric barrier discharge reactor for Ar plasma jet generation. Charteristics of discharge and temperature thermogram of plasma jet are investigated by the means of U-P curve and infrared image, respectively. Performance of the plasma jet is evaluated by surface and water sterilization. The results show that, Ar plasma jet is generated stable with double-dielectric barrier discharge. The length of plasma jet increases as the applied voltage, frequency or gas flow increased, but the plasma jet generation can be restricted in high frequency or gas flow. For E. coli in the water and surface, high sterilization efficiency is observed for a short time treatment by Ar plasma jet.

scholarly journals Design and Characterization of Low Temperature Co-Fired Ceramic Dielectric Barrier Discharge Plasma Arrays for Killing and Removing Bacterial Biofilms

2020 ◽  
Author(s):  
Adam Croteau
Keyword(s):  
Low Temperature ◽  
Dielectric Barrier Discharge ◽  
Gas Flow ◽  
Barrier Discharge ◽  
Atmospheric Pressure Plasma ◽  
Bacterial Biofilms ◽  
Single Element ◽  
Dielectric Barrier ◽  
Flow Rates ◽  
Barrier Discharge Plasma

Present research at Boise State University (BSU) has demonstrated the ability of low temperature co-fired ceramic (LTCC) Dielectric Barrier Discharge (DBD) cold atmospheric pressure plasma (CAP) devices to remove bacterial biofilms on steel substrates. Although bacteria may easily be inactivated by plasma treatment, the remains of the organism are still present on the substrate. It is shown that single element DBD CAP discharge devices operating at 2100 Vrms with 5 LPM of hydrated argon gas etched P. fluorescens biofilm within a few minutes of exposure. Similarly, using an 8 element array of linear plasma discharges, etch removal of biofilm was demonstrated. After 5 minutes of treatment, the majority of the biofilm was removed leaving only a thin layer ≈ 8 μm) remaining. Incorporating 150 kΩ ballast resistors in multi-discharge arrays greatly reduced variation in discharge channel current. The thermal properties of these devices were also determined in order to find optimal gas flow rates to prevent killing biofilm bacteria by thermal processes. This research shows that feed gas flow rates, power delivered to the plasma, proximity to substrate and flow gas hydration are important factors in etching or removal of bacterial biofilms from surfaces.

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