Cold atmospheric pressure plasma jets as sources of singlet delta oxygen for biomedical applications

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3601347· OSTI ID:21538431

Sousa, J S; Niemi, K; Cox, L J; Algwari, Q Th; Gans, T; O'Connell, D ^[1]

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1. Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, University Road, Belfast BT7 1NN, Northern Ireland (United Kingdom)

Absolute densities of singlet delta oxygen (SDO) molecules were measured using infrared optical emission spectroscopy in the flowing effluents of two different atmospheric-pressure plasma jets (APPJs): a capacitively coupled radio-frequency-driven jet (rf-APPJ) and a lower frequency kilohertz-driven dielectric barrier discharge jet. The plasma jets were operated in helium, with small admixtures of molecular oxygen (O{sub 2} < 2%). High absolute SDO densities of up to 6.2 x 10{sup 15} cm{sup -3} were measured at approximately 10 cm downstream. The rf-APPJ seems to be much more efficient in producing SDO. The influence of different parameters, such as gas flows and mixtures and power coupled to the plasmas, on the production of SDO by the two APPJs has been investigated. Despite the considerable differences between the two plasma jets (excitation frequency, electric field direction, inter-electrode distance, plasma propagation), similar dependencies on the oxygen admixture and on the dissipated power were found in both APPJs. However, opposite trends were observed for the gas flow dependence. The results presented in this paper show that the control of the external operating conditions of each APPJ enables the tailoring of the SDO composition of both plasma effluents. This provides scope to tune the plasma jets for desired applications, e.g., in biomedicine.

• OSTI ID: 21538431
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 12; Other Information: DOI: 10.1063/1.3601347; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATMOSPHERIC PRESSURE
DENSITY
DIELECTRIC MATERIALS
ELECTRIC FIELDS
ELECTRODES
EMISSION SPECTROSCOPY
EXCITATION
GAS FLOW
HELIUM
HIGH-FREQUENCY DISCHARGES
IRRADIATION
LUMINESCENCE
OXYGEN
PLASMA JETS
POLYCARBONATES
RADIOWAVE RADIATION
CARBON COMPOUNDS
CARBONATES
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
ENERGY-LEVEL TRANSITIONS
FLUID FLOW
FLUIDS
GASES
MATERIALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PHOTON EMISSION
PHYSICAL PROPERTIES
POLYMERS
RADIATIONS
RARE GASES
SPECTROSCOPY