Login (DCU Staff Only)
Login (DCU Staff Only)

DORAS | DCU Research Repository

Explore open access research and scholarly works from DCU

Advanced Search

Atomic oxygen patterning from a biomedical needle-plasma source

Kelly, Seán orcid logoORCID: 0000-0002-8782-9633 and Turner, Miles M. orcid logoORCID: 0000-0001-9713-6198 (2013) Atomic oxygen patterning from a biomedical needle-plasma source. Journal of Applied Physics, 114 (12). p. 123301. ISSN 0021-8979

A "plasma needle" is a cold plasma source operating at atmospheric pressure. Such sources interact strongly with living cells, but experimental studies on bacterial samples show that this interaction has a surprising pattern resulting in circular or annular killing structures. This paper presents numerical simulations showing that this pattern occurs because biologically active reactive oxygen and nitrogen species are produced dominantly where effluent from the plasma needle interacts with ambient air. A novel solution strategy is utilised coupling plasma produced neutral (uncharged) reactive species to the gas dynamics solving for steady state profiles at the treated biological surface. Numerical results are compared with experimental reports corroborating evidence for atomic oxygen as a key bactericidal species. Surface losses are considered for interaction of plasma produced reactants with reactive solid and liquid interfaces. Atomic oxygen surface reactions on a reactive solid surface with adsorption probabilities above 0.1 are shown to be limited by the flux of atomic oxygen from the plasma. Interaction of the source with an aqueous surface showed hydrogen peroxide as the dominant species at this interface. (C) 2013 AIP Publishing LLC.
Item Type:Article (Published)
Subjects:Physical Sciences > Plasmas
Physical Sciences > Physics
Physical Sciences > Plasma processing
Computer Science > Computer simulation
DCU Faculties and Centres:Research Institutes and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Institute of Physics
Official URL:http://dx.doi.org/10.1063/1.4821241
Copyright Information:© 2013 AIP
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland
ID Code:19725
Deposited On:30 Jan 2014 11:35 by Miles Turner . Last Modified 24 Jan 2019 10:30

Full text available as:

[thumbnail of sean_kelly_jap_paper.pdf]
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader


Downloads per month over past year

Archive Staff Only: edit this record