PLIF/PPF-LIF Measurements of 2D Spatial Distributions of OH, H<sub>2</sub>O<sub>2</sub>, and HO<sub>2</sub> in the Effluent of a He + H<sub>2</sub>O COST-Jet with and without Solid Targets
ORAL
Abstract
Non-thermal plasmas (NTPs) have the capability of delivering immunostimulatory reactive oxygen and nitrogen species (RONS). However, NTPs complex chemical mechanisms pose challenges in isolating the specific contributions of individual RONS to the desired effects. Therefore, it is crucial to precisely measure and map RONS spatial distributions both with and without targets, to optimize their diverse application. This utilizes a combination of planar laser-induced fluorescence (PLIF) and planar photofragmentation laser-induced fluorescence (PPF-LIF) techniques to image the spatial distributions of three key reactive species - the hydroxyl radical (OH), hydrogen peroxide (H2O2), and the hydroperoxyl radical (HO2) - in the effluent of a humid-Helium driven Capacitively Coupled Atmospheric Pressure Microplasma Jet (COST-jet). The resulting 2D profiles of these species will be investigated when the jet propagates into open atmosphere vs impinging on solid targets. Calibration methods used to quantify the PLIF/PPF-LIF signals and differentiating between H2O2 and HO2 will be discussed as well as the observed formation of chemical reaction fronts where the jet effluent mixes with the surrounding atmosphere. This research enhances our understanding of OH, H2O2, and HO2 in the jet effluent, bringing us closer to deciphering the complex plasma chemistry interactions required to advance medical applications and customize the deliverable densities of essential reactive species.
*This work is based partly upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences Opportunities in Frontier Plasma Science program under Award Number DE-SC-0021329. This research used resources of the Low Temperature Plasma Research Facility at Sandia National Laboratories, which is a collaborative research facility supported by the U. S. Department of Energy, Office of Science, Office of Fusion Energy Sciences.
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Publication:Herrera Quesada M. J., Pfaff S., Polito J., Gall G., Kushner M. J., Frank J. H., Stapelmann K. Absolute PLIF Measurements of the 2D Spatial Distributions of OH in the COST-Jet Effluent in Different Atmospheres with and without Solid Targets. Journal of Physics D: Applied Physics. Submission in Progress
Herrera Quesada M. J., Pfaff S., Frank J. H., Stapelmann K. Absolute PLIF Measurements of 2D Spatial Distributions of H₂O₂ and HO₂ in the Effluent of a He + H₂O COST-Jet with and without Solid Targets. Journal of Physics D: Applied Physics. Submission in Progress
