Hybrid Arc/Glow Microdischarges at Atmospheric Pressure and Their Use in Portable Systems for Liquid and Gas Sensing

Mitra, Bhaskar; Levey, B.; Gianchandani, Yogesh B.

doi:10.1109/tps.2008.927135

Cited by 45 publications

(23 citation statements)

References 26 publications

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“…As a result, plasmas in or in contact with liquids are very effective for the treatment of many biological and chemical objects. Examples of applications include surgery [4], lithotripsy [5] and chemical analysis [6]. Among different types of plasmas in contact with water, a dc discharge above water surface is one having the advantage of easy optical access to the plasma, which is especially important for active laser diagnostics.…”

Section: Introductionmentioning

confidence: 99%

Measurement of OH radicals at stateX²Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N₂by means of laser-induced fluorescence spectroscopy

Li¹,

Nikiforov²,

Xiong³

et al. 2012

J. Phys. D: Appl. Phys.

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The density of OH radicals in ground state is measured by laser-induced fluorescence (LIF) spectroscopy in the core of a micro-flow discharge in He, Ar and N 2 with a water electrode. The lines P 2 (6), P 1 (4) and P 2 (3) of the X 2 (v = 0) to the A 2 + (v = 1) transition are used for OH radical excitation. The density of the main quencher of OH radical in the core of the discharge is estimated based on the time decay of the LIF signal. It is revealed that the plasma core consists of a high amount of 8-10% of water vapour. The calculation of the absolute density of OH radical is carried out based on the model of LIF excitation including vibrational and translation energy transfer, and the results in different gases are presented for the discharge.

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Section: Introductionmentioning

confidence: 99%

Measurement of OH radicals at stateX²Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N₂by means of laser-induced fluorescence spectroscopy

Li¹,

Nikiforov²,

Xiong³

et al. 2012

J. Phys. D: Appl. Phys.

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“…Existing applications of plasmas in liquid include surgery [2], lithotripsy [3] and (miniaturized) chemical analysis [4]. Water containing plasmas produce strongly oxidizing species (OH, O, H 2 O 2 , etc) and UV radiation.…”

Section: Introductionmentioning

confidence: 99%

Validation of gas temperature measurements by OES in an atmospheric air glow discharge with water electrode using Rayleigh scattering

Verreycken

Gessel

Pageau

et al. 2011

Plasma Sources Sci. Technol.

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. (2011). Validation of gas temperature measurements by OES in an atmospheric air glow discharge with water electrode using Rayleigh scattering. Plasma Sources Science and Technology, 20(2), 024002-1/6. DOI: 10.1088/0963-0252/20/2/024002 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract Rayleigh scattering is used to determine the gas temperature of an atmospheric pressure dc excited glow discharge in air with a water electrode. The obtained temperatures are compared with calculated rotational temperatures measured by optical emission spectroscopy of OH(A-X) and N 2 (C-B). At a current of 15 mA a deviation is found between T rot (OH) and the gas temperature obtained from Rayleigh scattering of about 1000 K. The gas temperatures obtained from Rayleigh scattering, N 2 (C) and OH(A) in the positive column are, respectively, 2600 ± 100 K, 2700 ± 150 K and 3600 ± 200 K. It is shown that the rotational temperature of N 2 (C) is a reliable measurement of the gas temperature while this is not the case for OH(A). The results are explained in the context of quenching processes of the excited states. Spatially resolved gas temperatures in both longitudinal and radial directions are presented. The observed strong temperature gradients near the electrodes are checked to be consistent with the power dissipation and the heat transfer in the discharge. The effect of the polarity of the water electrode and filamentation on the measured temperatures is discussed.

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“…Steady growth in the development of microplasmas and other low power plasma for analytical chemistry applications has been seen in the recent literature [14,15], the driving force being the potential for developing small, low power devices with reduced operational cost and increased fieldability [16,17], with many focused on coupling to portable low resource MS instrumentation [18][19][20]. Microplasma-based miniature ion sources operated under ambient sampling/ionization conditions have the additional advantages of high sample throughput and simplicity, enabling direct analysis with little or no sample preparation [21,22].…”

Section: Introductionmentioning

confidence: 99%

Microplasma Ionization of Volatile Organics for Improving Air/Water Monitoring Systems On-Board the International Space Station

Bernier

Alberici

Keelor

et al. 2016

J. Am. Soc. Mass Spectrom.

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Abstract. Low molecular weight polar organics are commonly observed in spacecraft environments. Increasing concentrations of one or more of these contaminants can negatively impact Environmental Control and Life Support (ECLS) systems and/or the health of crew members, posing potential risks to the success of manned space missions. Ambient plasma ionization mass spectrometry (MS) is finding effective use as part of the analytical methodologies being tested for next-generation space module environmental analysis. However, ambient ionization methods employing atmospheric plasmas typically require relatively high operation voltages and power, thus limiting their applicability in combination with fieldable mass spectrometers. In this work, we investigate the use of a low power microplasma device in the microhollow cathode discharge (MHCD) configuration for the analysis of polar organics encountered in space missions. A metal-insulator-metal (MIM) structure with molybdenum foil disc electrodes and a mica insulator was used to form a 300 μm diameter plasma discharge cavity. We demonstrate the application of these MIM microplasmas as part of a versatile miniature ion source for the analysis of typical volatile contaminants found in the International Space Station (ISS) environment, highlighting their advantages as low cost and simple analytical devices.

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Hybrid Arc/Glow Microdischarges at Atmospheric Pressure and Their Use in Portable Systems for Liquid and Gas Sensing

Cited by 45 publications

References 26 publications

Measurement of OH radicals at stateX²Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N₂by means of laser-induced fluorescence spectroscopy

Measurement of OH radicals at stateX²Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N₂by means of laser-induced fluorescence spectroscopy

Validation of gas temperature measurements by OES in an atmospheric air glow discharge with water electrode using Rayleigh scattering

Microplasma Ionization of Volatile Organics for Improving Air/Water Monitoring Systems On-Board the International Space Station

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Hybrid Arc/Glow Microdischarges at Atmospheric Pressure and Their Use in Portable Systems for Liquid and Gas Sensing

Cited by 45 publications

References 26 publications

Measurement of OH radicals at stateX2Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N2by means of laser-induced fluorescence spectroscopy

Measurement of OH radicals at stateX2Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N2by means of laser-induced fluorescence spectroscopy

Validation of gas temperature measurements by OES in an atmospheric air glow discharge with water electrode using Rayleigh scattering

Microplasma Ionization of Volatile Organics for Improving Air/Water Monitoring Systems On-Board the International Space Station

Contact Info

Product

Resources

About

Measurement of OH radicals at stateX²Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N₂by means of laser-induced fluorescence spectroscopy

Measurement of OH radicals at stateX²Π in an atmospheric-pressure micro-flow dc plasma with liquid electrodes in He, Ar and N₂by means of laser-induced fluorescence spectroscopy