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Title: 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 H 2O content in the feed gas, and approach saturation values at higher admixtures on the order of 3 × 10 14 cm -3 for OH and 3 × 10 13 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 H 2O, 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 H 2O + by proton transfer to H 2O and by electron impactmore » dissociation of H 2O. It is lost by reactions with other OH molecules to form either H 2O + O or H 2O 2. 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3];  [1]; ORCiD logo [1]; ORCiD logo [1];  [4];  [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. University of York, Heslington, York (United Kingdom). York Plasma Institute, Department of Physics
  2. University of York, Heslington, York (United Kingdom). York Plasma Institute, Department of Physics ; Université Paris-Saclay, Sorbonne Universités, PSL Research University, Palaiseau (France). LPP, CNRS, Ecole Polytechnique, UPMC Univ. Paris-Sud, Observatoire de Paris
  3. University of York, Heslington, York (United Kingdom). York Plasma Institute, Department of Physics and Centre of Immunology and Infection, Department of Biology and Hull York Medical School
  4. Synchrotron Soleil, l'Orme des Merisiers, Gif sur Yvette Cedex (France)
  5. Univ. of Michigan, Ann Arbor, MI (United States). Department of Electrical Engineering and Computer Science
  6. Université Paris-Saclay, Sorbonne Universités, PSL Research University, Palaiseau (France). 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:  
SC0014132; SC0001319
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 20; Journal Issue: 37; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
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 States: 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 States. 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, and O'Connell, Deborah. Thu . "Chemical kinetics in an atmospheric pressure helium plasma containing humidity". United States. doi: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 (Print)},
number = 37,
volume = 20,
place = {United States},
year = {Thu Sep 13 00:00:00 EDT 2018},
month = {Thu Sep 13 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1039/c8cp02473a

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Works referenced in this record:

Low Temperature Plasma-Based Sterilization: Overview and State-of-the-Art
journal, June 2005