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Generation and loss of reactive oxygen species in low-temperature atmospheric-pressure RF He + O2 + H2O plasmas

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journal contribution
posted on 2014-11-28, 14:51 authored by Kirsty McKay, Ding-Xin Liu, Ming-Zhe Rong, Felipe IzaFelipe Iza, Michael G. Kong
This study focuses on the generation and loss of reactive oxygen species (ROS) in low-temperature atmospheric-pressure RF (13.56 MHz) He + O2 + H2O plasmas, which are of interest for many biomedical applications. These plasmas create cocktails of ROS containing ozone, singlet oxygen, atomic oxygen, hydroxyl radicals, hydrogen peroxide and hydroperoxyl radicals, i.e. ROS of great significance as recognized by the free-radical biology community. By means of one-dimensional fluid simulations (61 species, 878 reactions), the key ROS and their generation and loss mechanisms are identified as a function of the oxygen and water content in the feed gas. Identification of the main chemical pathways can guide the optimization of He + O2 + H2O plasmas for the production of particular ROS. It is found that for a given oxygen concentration, the presence of water in the feed gas decreases the net production of oxygen-derived ROS, while for a given water concentration, the presence of oxygen enhances the net production of water-derived ROS. Although most ROS can be generated in a wide range of oxygen and water admixtures, the chemical pathways leading to their generation change significantly as a function of the feed gas composition. Therefore, care must be taken when selecting reduced chemical sets to study these plasmas.

Funding

This work was supported by the Engineering Physical Science Research Council (EPSRC) of UK and the State Key Laboratory of Electrical Insulation and Power Equipment (No EIPE12301).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

JOURNAL OF PHYSICS D-APPLIED PHYSICS

Volume

45

Issue

17

Pages

? - ? (5)

Citation

MCKAY, K. ... et al, 2012. Generation and loss of reactive oxygen species in low-temperature atmospheric-pressure RF He + O2 + H2O plasmas. Journal of Physics D - Applied Physics, 45 (17), 172001.

Publisher

© IOP Publishing Ltd

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2012

Notes

This article was published in the serial, Journal of Physics D: Applied Physics [© IOP Publishing Ltd]. The definitive version is available at: http://dx.doi.org/10.1088/0022-3727/45/17/172001

ISSN

0022-3727

Language

  • en

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