Investigation on Atmospheric Pressure Plasma Jet of DBD and its Application on Bacteria Inactivation

2015 ◽  
Vol 719-720 ◽  
pp. 221-230
Author(s):  
Tao Liang ◽  
Shi Ying Hou
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flow ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Plasma ◽  
Flow Mode ◽  
Half Cycle ◽  
Multiple Pulse ◽  
Jet Length ◽  
Bacteria Inactivation

Two kinds of multiple-pulse were reported on atmospheric plasma jet (APPJ) of dielectric barrier discharge (DBD) configurations in this study. Meanwhile, the investigation on electrical characteristics of APPJ in helium and helium/air was carried out with the aim of shedding light on the electrode parameters for dissipated power and jet length. The typical bacteria, E. coil, were employed to study the effect by the two APPJ devices (PJ-1 and PJ-2). For PJ-1, multiple-pulse appears in both sides of every half-cycle, but only in the positive half-cycle for PJ-2. A wider power electrode of PJ-1 and further distance from the nozzle to grounding electrode of PJ-2, whether in ambient helium or helium/air, are all conducive to improvement of dissipated power. With the increase of gas flow rate, the jet length will become longer at laminar flow mode, then get shorter, and a permanent to the end. Generally, the introduction of air leads a better sterilization effect, especially for PJ-1. Keywords: Atmospheric Pressure, multiple-pulse, Electrode parameters, dissipated power, jet length, plasma jet. PACS: 52.80.-s, 52.77.-j

Studying of Plasma- Polymerized Pyrrole at Variable Gas Flow Rates Via Plasma Jet

2021 ◽  
Vol 19 (48) ◽  
pp. 44-51
Author(s):  
Saba Jawad Kadhem
Keyword(s):  
Flow Rate ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Flow Characteristics ◽  
Atmospheric Pressure Plasma ◽  
Optical Emission ◽  
Plasma Jet ◽  
Nonequilibrium Plasma ◽  
Nano Particles ◽  
Vis Spectroscopy

     In this manuscript has investigated the synthesis of plasma-polymerized pyrrole (C4H5N) nano-particles prepared by the proposed atmospheric pressure nonequilibrium plasma jet through the parametric studies, particularly gas flow rate (0.5, 1 and 1.5 L/min). The plasma jet which used operates with alternating voltage 7.5kv and frequency 28kHz. The plasma-flow characteristics were investigated based on optical emission spectroscopy (OES). UV-Vis spectroscopy was used to characterize the  oxidization  state for polypyrrole. The major absorption appears around 464.1, 449.7 and 435.3  nm at the three flow rate of argon gas. The chemical composition and structural properties of the contained samples which synthesized at 0.5 L/min as a argon flow rate were analyzed by scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR), Raman spectroscopy and X-ray diffraction (XRD). SEM point to a uniform distribution of polypyrrole (PPY) nanoparticles matrix. XRD technique showed a semicrystalline pattern for PPY)thin film. It is expected, that the high-quality plasma polymer grown by atmospheric pressure plasma jet method contributes to serving as conducting materials.

Development and Characterization of a Portable Atmospheric-Pressure Argon Plasma Jet for Sterilization

2015 ◽  
Author(s):  
Zhi-Hua Lin ◽  
Jong-Shinn Wu ◽  
Chen-Yon Tobias Tschang ◽  
Chi-Feng Su ◽  
Tuoh Wu ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Argon Plasma ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Gas Temperature ◽  
E Coli ◽  
Bacteria Inactivation ◽  
Argon Plasma Jet ◽  
Absorption Power

In this study, we would like to develop a portable round argon atmospheric-pressure plasma jet (APPJ) which can be applied for general use of bacteria inactivation. The APPJ was characterized electrically and optically, which include measurements of absorption power, gas temperature and optical properties of plasma generated species. Measured OH* number density at 5 mm downstream was estimated to be 5.8 × 1015 cm−3 and the electron density and electron temperature were estimated to be 2.4 × 1015 cm−3 and 0.34 eV, respectively, in the discharge region. This APPJ was demonstrated to effectively inactivate E. coli within seconds of treatment, which shows its great potential in the future use of general bacteria inactivation and sterilization.

Effects of sheath gas flow on He atmospheric pressure plasma jet

2019 ◽  
Vol 12 (3) ◽  
pp. 036001 ◽  
Author(s):  
Kotaro Ogawa ◽  
Hideki Yajima ◽  
Jun-Seok Oh ◽  
Hiroshi Furuta ◽  
Akimitsu Hatta
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flow ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma

Study on dynamics of the influence exerted by plasma on gas flow field in non-thermal atmospheric pressure plasma jet

2016 ◽  
Vol 23 (6) ◽  
pp. 063523 ◽  
Author(s):  
M. Hasnain Qaisrani ◽  
Yubin Xian ◽  
Congyun Li ◽  
Xuekai Pei ◽  
Maede Ghasemi ◽  
...  
Keyword(s):  
Flow Field ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
Gas Flow Field

scholarly journals The Effect of Oxygen Admixture with Argon Discharges on the Impact Parameters of Atmospheric Pressure Plasma Jet Characteristics

2021 ◽  
Vol 11 (15) ◽  
pp. 6870
Author(s):  
Atif H. Asghar ◽  
Ahmed Rida Galaly
Keyword(s):  
Flow Rate ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Emission Spectra ◽  
Optical Emission ◽  
Plasma Jet ◽  
Flow Rates ◽  
Jet Length ◽  
Pressure Plasma ◽  
Optical Emission Spectra

Dry argon (Ar) discharge and wet oxygen/argon (O2/Ar) admixture discharge for alternating current atmospheric pressure plasma jets (APPJs) were studied for Ar discharges with flow rates ranging from 0.2 to 4 slm and for O2/Ar discharges with different O2 ratios and flow rates ranging from 2.5 to 15 mslm. The voltage–current waveform signals of APPJ discharge, gas flow rate, photo-imaging of the plasma jet length and width, discharge plasma power, axial temperature distribution, optical emission spectra, and irradiance were investigated. Different behavior for varying oxygen content in the admixture discharge was observed. The temperature recognizably decreased, axially, far away from the nozzle of the jet as the flow rate of dry argon decreased. Similar behavior was observed for wet argon but with a lower temperature than for dry argon. The optical emission spectra and the dose rate of irradiance of a plasma jet discharge were investigated as a function of plasma jet length, for dry and wet Ar discharges, to determine the data compatible with the International Commission on Non-Ionizing Radiation Protection (ICNIRP) data for irradiance exposure limits of the skin, which are suitable for the disinfection of microbes on the skin without harmful effects, equivalent to 30 μJ/mm2.

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