Chemical kinetics in an atmospheric pressure helium plasma containing humidity
Abstract
Atmospheric pressure plasmas are sources of biologically active oxygen and nitrogen species, which makes them potentially suitable for the use as biomedical devices. Here, experiments and simulations are combined to investigate the formation of the key reactive oxygen species, atomic oxygen (O) and hydroxyl radicals (OH), in a radio-frequency driven atmospheric pressure plasma jet operated in humidified helium. Vacuum ultra-violet high-resolution Fourier-transform absorption spectroscopy and ultra-violet broad-band absorption spectroscopy are used to measure absolute densities of O and OH. These densities increase with increasing H2O content in the feed gas, and approach saturation values at higher admixtures on the order of 3 × 1014 cm-3 for OH and 3 × 1013 cm-3 for O. Experimental results are used to benchmark densities obtained from zero-dimensional plasma chemical kinetics simulations, which reveal the dominant formation pathways. At low humidity content, O is formed from OH+ by proton transfer to H2O, which also initiates the formation of large cluster ions. At higher humidity content, O is created by reactions between OH radicals, and lost by recombination with OH. OH is produced mainly from H2O+ by proton transfer to H2O and by electron impact dissociation of H2O. It is lost by reactions with othermore »
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- York Plasma Institute, Department of Physics, University of York, York YO10 5DD, UK
- Synchrotron Soleil, l'Orme des Merisiers, 91192 Gif sur Yvette Cedex, France
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, USA
- LPP, CNRS, Ecole Polytechnique, UPMC Univ. Paris-Sud, Observatoire de Paris
- Publication Date:
- Research Org.:
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1470577
- Alternate Identifier(s):
- OSTI ID: 1483482
- Grant/Contract Number:
- SC0001319; SC0014132
- Resource Type:
- Published Article
- Journal Name:
- Physical Chemistry Chemical Physics. PCCP
- Additional Journal Information:
- Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Volume: 20 Journal Issue: 37; Journal ID: ISSN 1463-9076
- Publisher:
- Royal Society of Chemistry (RSC)
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Schröter, Sandra, Wijaikhum, Apiwat, Gibson, Andrew R., West, Andrew, Davies, Helen L., Minesi, Nicolas, Dedrick, James, Wagenaars, Erik, de Oliveira, Nelson, Nahon, Laurent, Kushner, Mark J., Booth, Jean-Paul, Niemi, Kari, Gans, Timo, and O'Connell, Deborah. Chemical kinetics in an atmospheric pressure helium plasma containing humidity. United Kingdom: N. p., 2018.
Web. doi:10.1039/C8CP02473A.
Schröter, Sandra, Wijaikhum, Apiwat, Gibson, Andrew R., West, Andrew, Davies, Helen L., Minesi, Nicolas, Dedrick, James, Wagenaars, Erik, de Oliveira, Nelson, Nahon, Laurent, Kushner, Mark J., Booth, Jean-Paul, Niemi, Kari, Gans, Timo, & O'Connell, Deborah. Chemical kinetics in an atmospheric pressure helium plasma containing humidity. United Kingdom. https://doi.org/10.1039/C8CP02473A
Schröter, Sandra, Wijaikhum, Apiwat, Gibson, Andrew R., West, Andrew, Davies, Helen L., Minesi, Nicolas, Dedrick, James, Wagenaars, Erik, de Oliveira, Nelson, Nahon, Laurent, Kushner, Mark J., Booth, Jean-Paul, Niemi, Kari, Gans, Timo, and O'Connell, Deborah. Mon .
"Chemical kinetics in an atmospheric pressure helium plasma containing humidity". United Kingdom. https://doi.org/10.1039/C8CP02473A.
@article{osti_1470577,
title = {Chemical kinetics in an atmospheric pressure helium plasma containing humidity},
author = {Schröter, Sandra and Wijaikhum, Apiwat and Gibson, Andrew R. and West, Andrew and Davies, Helen L. and Minesi, Nicolas and Dedrick, James and Wagenaars, Erik and de Oliveira, Nelson and Nahon, Laurent and Kushner, Mark J. and Booth, Jean-Paul and Niemi, Kari and Gans, Timo and O'Connell, Deborah},
abstractNote = {Atmospheric pressure plasmas are sources of biologically active oxygen and nitrogen species, which makes them potentially suitable for the use as biomedical devices. Here, experiments and simulations are combined to investigate the formation of the key reactive oxygen species, atomic oxygen (O) and hydroxyl radicals (OH), in a radio-frequency driven atmospheric pressure plasma jet operated in humidified helium. Vacuum ultra-violet high-resolution Fourier-transform absorption spectroscopy and ultra-violet broad-band absorption spectroscopy are used to measure absolute densities of O and OH. These densities increase with increasing H2O content in the feed gas, and approach saturation values at higher admixtures on the order of 3 × 1014 cm-3 for OH and 3 × 1013 cm-3 for O. Experimental results are used to benchmark densities obtained from zero-dimensional plasma chemical kinetics simulations, which reveal the dominant formation pathways. At low humidity content, O is formed from OH+ by proton transfer to H2O, which also initiates the formation of large cluster ions. At higher humidity content, O is created by reactions between OH radicals, and lost by recombination with OH. OH is produced mainly from H2O+ by proton transfer to H2O and by electron impact dissociation of H2O. It is lost by reactions with other OH molecules to form either H2O + O or H2O2. Formation pathways change as a function of humidity content and position in the plasma channel. The understanding of the chemical kinetics of O and OH gained in this work will help in the development of plasma tailoring strategies to optimise their densities in applications.},
doi = {10.1039/C8CP02473A},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 37,
volume = 20,
place = {United Kingdom},
year = {Mon Jan 01 00:00:00 EST 2018},
month = {Mon Jan 01 00:00:00 EST 2018}
}
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Cited by: 52 works
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Fig. 1: (a) Schematic cross-section and (b) photograph of the plasma source. The perpendicular orientation of the synchrotron vacuum ultraviolet (VUV) beam with respect to the plasma channel is indicated by the dashed rectangle. Images taken from Dedrick et al., under a Creative Commons Attribution 3.0 licence (https://creativecommons.org/licenses/ by/3.0/).
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