Measurement, modelling, and control of the reactive species composition in the effluent of an argon plasma jet

Reuter, Stephan; Winter, J.; Hammer, Malte U.; Masur, Kai; Wende, Kristian; Tresp, Helena; Schmidt-Bleker, Ansgar; Dünnbier, M.; Hänsch, Mareike; Woedtke, Th. von; Weltmann, K.‐D.

doi:10.1109/plasma.2012.6383767

Cited by 1 publication

(2 citation statements)

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“…One of the challenges is tailoring the plasma gas-phase chemistry to each specific application. Tailoring the chemistry is usually achieved by adjusting external parameters such as: the gas composition [6,7,[14][15][16], the electric field distribution (by modifying the source design), or the applied voltage characteristics (direct or pulsed voltage, rise time, amplitude, frequency) [17,18,[35][36][37]. The latter two approaches can require modification of the plasma hardware, limiting their value for process control and operation for multiple different processes.…”

Section: Introductionmentioning

confidence: 99%

“…For biomedical applications the emphasis has been on understanding and optimising the production of reactive oxygen and nitrogen species due to their high oxidative power and their natural roles in major biological functions (in particular in the immune system, or as signalling molecules in cellular functions [1,3,4,16,23,24]). In the presence of water, which can come from the biological target, itself or may be intentionally introduced to the feed gas, hydrogen peroxide (H 2 O 2 ) attracts particular attention.…”

Section: Introductionmentioning

confidence: 99%

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Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma

Brisset

Gibson

Schröter

et al. 2021

J. Phys. D: Appl. Phys.

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This work presents experiments and modelling of OH densities in a radio-frequency driven atmospheric-pressure plasma in a plane-parallel geometry, operated in helium with small admixtures of oxygen and water vapour (He+O2+H2O). The density of OH is measured under a wide range of conditions by absorption spectroscopy, using an ultra-stable laser-driven broad-band light source. These measurements are compared with 0D plasma chemical kinetics simulations adapted for high levels of O2 (1%). Without O2 admixture, the measured density of OH increases from 1.0×10 14 to 4.0×10 14 cm -3 for H2O admixtures from 0.05% to 1%. The density of atomic oxygen is about 1×10 13 cm -3 and grows with humidity content. With O2 admixture, the OH density stays relatively constant, showing only a small maximum at 0.1% O2. The simulations predict that the atomic oxygen density is strongly increased by O2 addition. It reaches 10 15 cm -3 without humidity, but is limited to 10 14 cm -3 beyond 0.05% water content. The addition of O2 has a weak effect on the OH density because, while atomic oxygen becomes a dominant precursor for the formation of OH, it makes a nearly equal contribution to the loss processes of OH. The small increase in the density of OH with the addition of O2 is instead due to reaction pathways involving increased production of HO2 and O3. The simulations show that the densities of OH, O and O3 can be tailored relatively independently over a wide range of conditions. The densities of O and O3 are strongly affected by the presence of small quantities (0.05%) of water vapour, but further water addition has little effect. Therefore, a greater range and control of the reactive species mix from the plasma can be obtained by the use of well-controlled multiple gas admixtures, instead of relying on ambient air mixing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma

Brisset

Gibson

Schröter

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

Measurement, modelling, and control of the reactive species composition in the effluent of an argon plasma jet

Cited by 1 publication

References 3 publications

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma

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Measurement, modelling, and control of the reactive species composition in the effluent of an argon plasma jet

Cited by 1 publication

References 3 publications

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O2 + H2O radiofrequency plasma

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O2 + H2O radiofrequency plasma

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Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma

Chemical kinetics and density measurements of OH in an atmospheric pressure He + O₂ + H₂O radiofrequency plasma