The plasma levitation of droplets

Poulain, Cédric; Dugué, Antoine; Durieux, Antoine; Sadeghi, N.; Duplat, Jérôme

doi:10.1063/1.4926964

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…The width of the broad component can only be explained by significant Stark broadening and therefore originates from H atoms in a high density plasma environment. Similar examples of twocomponent hydrogen line profiles were observed and studied, for example, in [37][38][39] in different types of plasmas. It was explained that the two-component line profile is caused by the spatially and/or temporally more complex plasma.…”

Section: Phase Resolved Spectroscopysupporting

confidence: 66%

Electron density in surface barrier discharge emerging at argon/water interface: quantification for streamers and leaders

Cvetanović

Galmiz

Synek

et al. 2018

Plasma Sources Sci. Technol.

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Optical emission spectroscopy, fast intensified CCD imaging and electrical measurements were applied to investigate the basic plasma parameters of surface barrier discharge emerging from a conductive water electrode. The discharge was generated at the triple-line interface of atmospheric pressure argon gas and conductive water solution at the fused silica dielectrics using a sinusoidal high-voltage waveform. The spectroscopic methods of atomic line broadening and molecular spectroscopy were used to determine the electron densities and the gas temperature in the active plasma. These parameters were obtained for both applied voltage polarities and resolved spatially. Two different spectral signatures were identified in the spatially resolved spectra resulting in electron densities differing by two orders of magnitude. It is shown that two discharge mechanisms take a place: the streamer and the leader one, with electron densities of 10 14 and 10 16 cm −3 , respectively. This spectroscopic evidence is supported by the combined diagnostics of electrical current measurements and phase-resolved intensified CCD camera imaging.

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Section: Phase Resolved Spectroscopysupporting

confidence: 66%

Electron density in surface barrier discharge emerging at argon/water interface: quantification for streamers and leaders

Cvetanović

Galmiz

Synek

et al. 2018

Plasma Sources Sci. Technol.

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“…For jet velocities above

and impingement on a polished quartz wafer, an intriguing bright luminescent blue–pink spot appeared over the core region of the jet. An apparently similar luminous effect has been reported either in passing ( 10 ) or under different contexts ( 11 , 12 ), yet remained unexplained.…”

Section: Resultssupporting

confidence: 68%

Toroidal plasmoid generation via extreme hydrodynamic shear

Gharib

Mendoza

Rosenfeld

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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SignificancePlasmas at atmospheric pressure conditions are ubiquitous, in natural form, such as the familiar lightning, or produced through artificially created electromagnetic or electrostatic fields for industrial and scientific applications. One distinctive feature of these cold-type plasmas is their lack of a topologically defined shape, concurrent with spatial unsteadiness and nonuniformity. Here, we report the observation of a coherent and stable toroidal plasma that spontaneously forms under extreme hydrodynamic shear, without external electromagnetic action. The confined and chamberless nature of this plasmoid has potential implications for the investigation of plasma–matter interactions, in the development of plasma-based deposition techniques for the microelectronics industry, in the emerging field of plasma medicine, or as a model for energy-storing self-maintained plasmoids.

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“…The confined and chamberless nature of this plasmoid has potential implications for the investigation of plasma-matter interactions, in the development of plasmabased deposition techniques for the microelectronics industry, in the emerging field of plasma medicine, or as a model for energy-storing self-maintained plasmoids. similar luminous effect has been reported either in passing (10) or under different contexts (11,12), yet remained unexplained.…”

Section: Significancesupporting

confidence: 56%

Toroidal plasmoid generation via extreme hydrodynamic shear

Gharib

2020

Preprint

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Saint Elmo's fire and lightning are two known forms of naturally occurring atmospheric pressure plasmas. As a technology, nonthermal plasmas are induced from artificially created electromagnetic or electrostatic fields. Here we report the observation of arguably a unique case of a naturally formed such plasma, created in air at room temperature without external electromagnetic action, by impinging a high-speed microjet of deionized water on a dielectric solid surface. We demonstrate that tribo-electrification from extreme and focused hydrodynamic shear is the driving mechanism for the generation of energetic free electrons. Air ionization results in a plasma that, unlike the general family, is topologically well defined in the form of a coherent toroidal structure. Possibly confined through its self-induced electromagnetic field, this plasmoid is shown to emit strong luminescence and discretefrequency radio waves. Our experimental study suggests the discovery of a unique platform to support experimentation in lowtemperature plasma science.

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The plasma levitation of droplets

Abstract: International audienc

Cited by 6 publications

References 12 publications

Electron density in surface barrier discharge emerging at argon/water interface: quantification for streamers and leaders

Electron density in surface barrier discharge emerging at argon/water interface: quantification for streamers and leaders

Toroidal plasmoid generation via extreme hydrodynamic shear

Toroidal plasmoid generation via extreme hydrodynamic shear

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