Optical diagnostic of bipolar electrical discharges in HCl, KCl, and KOH solutions

Miron, Camelia; Bratescu, Maria Antoaneta; Saito, Nagahiro; Takai, Osamu

doi:10.1063/1.3597790

Cited by 18 publications

(18 citation statements)

References 32 publications

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“…OES based studies of liquid plasmas use combinations of absolute OES and modelling to yield species densities [48,450]. To our knowledge, one result has been reported on • OH density measurements in a submerged arc discharge by absorption spectroscopy [451]. In all cases, the dynamics of the liquid interface may influence the path of the beam and so affect the spatial resolution of the measurement.…”

Section: Gas Phase Diagnosticsmentioning

confidence: 99%

Plasma–liquid interactions: a review and roadmap

Bruggeman

Kushner

Locke

et al. 2016

Plasma Sources Sci. Technol.

1,231

885

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Plasma-liquid interactions represent a growing interdisciplinary area of research involving plasma science, fluid dynamics, heat and mass transfer, photolysis, multiphase chemistry and aerosol science. This review provides an assessment of the state-of-the-art of this multidisciplinary area and identifies the key research challenges. The developments in diagnostics, modeling and further extensions of cross section and reaction rate databases that are necessary to address these challenges are discussed. The review focusses on nonequilibrium plasmas.

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Section: Gas Phase Diagnosticsmentioning

confidence: 99%

Plasma–liquid interactions: a review and roadmap

Bruggeman

Kushner

Locke

et al. 2016

Plasma Sources Sci. Technol.

1,231

885

View full text Add to dashboard Cite

show abstract

“…A description of the SP must take into account various interfaces implicated during plasma operation: Gas‐liquid, gas‐plasma, plasma‐liquid, electrode‐liquid, electrode‐plasma, and gas‐electrode. Bubble formation or gas generation owing to the thermal heat (Joule heating) and electrolysis can explain the breakdown in the SP . The SP generation proceeds by (a) the formation of micro‐bubbles or gas by electrolysis and Joule heating (stage II), (b) the breakdown in the largely grown bubbles or expanded gas phase region (stage III), and (c) the formation of a full plasma channel (stage IV) in sequence, as seen in Figure .…”

Section: Discussionmentioning

confidence: 99%

“…When plasma obeys a local thermal equilibrium (LTE) condition, defined as “hot plasma” or “thermal plasma,” the density and temperature of ions are similar to those of electrons . In thermal plasma, the ion exerts dominant reaction within solution chemistry since the ion mass is higher than electron mass.…”

Section: Introductionmentioning

confidence: 99%

Generation of non‐equilibrium condition in solution plasma discharge using low‐pass filter circuit

Heo

Lee

Bratescu

et al. 2016

Plasma Processes & Polymers

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Solution plasma process has been researched as one of the synthetic methods of nano‐ and functional materials using plasma discharge in liquids. In this study, a low‐pass filter circuit was introduced to increase the density and temperature of electrons involved in a non‐equilibrium condition. The discharge properties of the solution plasma generated by conventional and low‐pass filter circuits were characterized and comparatively analyzed. Filtration of the MHz range current oscillations, an increase in the maximum discharge current, and a higher stability of solution plasma were obtained by simply inserting a resistor‐capacitor (RC) component in the circuit, which leads to the increases in the density and temperature of electrons.

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“…For example, for water sterilization systems using SP, the hydroxyl radical plays a crucial role in bacteria killing, and therefore the OH radical number density and dependence on water pH and electrical characteristics are imperative to be known . That is why the broadband absorption spectroscopy (BAS) method was developed and applied for plasma in aqueous solutions as a quantitative analysis of the OH radical …”

Section: Introductionmentioning

confidence: 99%

Quantitative spectrochemical analysis of solution plasma in aromatic molecules

Bratescu

Kim

Saito

2019

Plasma Processes & Polymers

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A nonthermal plasma produced at atmospheric pressure in the gas resulted from the surrounding liquid is named solution plasma (SP). A quantitative and comparative spectrochemical analysis of the plasma gas and solution in benzene, pyridine, and aniline is performed. The number densities of dicarbon and cyano radicals and hydrogen molecule from the plasma gas are measured using a cheap, straightforward, and home-made optical set-up. By simply modifying the optical set-up, the molar concentration of newly formed chemical compounds is in situ obtained in the solution. The thermodynamic properties of aromatic molecules determine the electrical breakdown and the species number densities in the plasma gas. The production rate and atomic composition of carbon material are correlated with the radicals from plasma gas.

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Optical diagnostic of bipolar electrical discharges in HCl, KCl, and KOH solutions

Abstract: Articles you may be interested inA passive measurement of dissociated atom densities in atmospheric pressure air discharge plasmas using vacuum ultraviolet self-absorption spectroscopy

Cited by 18 publications

References 32 publications

Plasma–liquid interactions: a review and roadmap

Plasma–liquid interactions: a review and roadmap

Generation of non‐equilibrium condition in solution plasma discharge using low‐pass filter circuit

Quantitative spectrochemical analysis of solution plasma in aromatic molecules

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