The role of oxygen in a large area of RF-powered atmospheric pressure dielectric barrier glow discharge plasma in sterilization
2011 (English)In: IEEE Transactions on Plasma Science, ISSN 0093-3813, Vol. 39, no 8, 1689-1694 p.Article in journal (Refereed) Published
A nonequilibrium Ar/O2 plasma at atmospheric pressure was generated between two parallel square electrodes by a 13.56-MHz power supplier. Experimental results demonstrate that the Ar/O2 plasma more effectively kills Staphylococcus aureus and Escherichia coli than the Ar plasma. When the O2 flow rate increases from 0 to 100 sccm step by step, the discharge voltage and the radio-frequency (RF) current always show sinusoidal waveforms, and the discharges maintain the α mode as well. In addition, the sterilization efficiency values of the RF-powered atmospheric pressure Ar/O2 plasma depend on the oxygen fraction in Ar gas. It is found that the sterilization efficiency of the Ar/O2 plasma is highest with 0.5 vol.% oxygen in argon gas, corresponding to the maximum production of O(3P) radicals. It is considered that the O(3P) radicals produced by the Ar/O2 plasma play a significant role in atmospheric plasma sterilization.
Place, publisher, year, edition, pages
2011. Vol. 39, no 8, 1689-1694 p.
Oxygen radicals, radio-frequency (RF)-powered atmospheric pressure plasma, sterilization mechanisms, Ar plasmas, Argon gas, Atmospheric plasmas, Dielectric-barrier glow discharges, Discharge voltages, Non equilibrium, Oxygen fractions, Oxygen radical, Power suppliers, Radio frequencies, Rate increase, Sinusoidal waveforms, Staphylococcus aureus, Step-by-step, Argon, Atmospheric pressure, Atmospherics, Bacteria, Escherichia coli, Glow discharges, Oxygen, Sterilization (cleaning), Plasmas
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-151169DOI: 10.1109/TPS.2011.2155104ISI: 000293754900009ScopusID: 2-s2.0-80051791435OAI: oai:DiVA.org:kth-151169DiVA: diva2:747620
QC 201409172014-09-172014-09-152015-10-09Bibliographically approved