Killing of bacterial spores contained in a paper envelope by a microwave plasma torch

Spencer Kuo, Olga Tarasenko, S. Popovic, Kalle Levon

Research output: Contribution to journalArticle

Abstract

The air plasma effluent of an arc-seed microwave torch is used to kill bacterial spores contained inside an envelope. The torch is operated at a 60-Hz periodic mode (with about 40% duty cycle) and runs stably at a low airflow rate (e.g., 0.393 l/s). The images of plasma torch plumes show that the arc loop of the discharge prolongs from the electrodes by nearly 3 cm and microwave energizes the charge particles along the arc loop considerably. The emission spectroscopy of the torch indicates that the plasma effluent contains an abundance of reactive atomic oxygen. Bacillus cereus is chosen for the biological agent in the decontamination experiment. The experiment and the decontamination efficacy of this torch are presented. The averaged temperature inside the envelope is measured to be less than 40 °C, thus ruling out the thermal decontamination mechanism.

Original languageEnglish (US)
Pages (from-to)1275-1280
Number of pages6
JournalIEEE Transactions on Plasma Science
Volume34
Issue number4 II
DOIs
StatePublished - Aug 2006

Fingerprint

plasma torches
torches
spores
decontamination
envelopes
microwaves
arcs
effluents
Bacillus
plumes
seeds
cycles
electrodes
air
oxygen
spectroscopy
temperature

Keywords

  • Biological warfare agents
  • Decontamination
  • Microwave plasma torch (MPT)
  • Oxidation
  • Spores

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics

Cite this

Killing of bacterial spores contained in a paper envelope by a microwave plasma torch. / Kuo, Spencer; Tarasenko, Olga; Popovic, S.; Levon, Kalle.

In: IEEE Transactions on Plasma Science, Vol. 34, No. 4 II, 08.2006, p. 1275-1280.

Research output: Contribution to journalArticle

Kuo, Spencer ; Tarasenko, Olga ; Popovic, S. ; Levon, Kalle. / Killing of bacterial spores contained in a paper envelope by a microwave plasma torch. In: IEEE Transactions on Plasma Science. 2006 ; Vol. 34, No. 4 II. pp. 1275-1280.
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