Static gas-liquid interfacial direct current discharge plasmas using ionic liquid cathode

Due to the unique properties of ionic liquids such as their extremely low vapor pressure and high heat capacity, we have succeeded in creating the static and stable gas (plasmas)-liquid (ionic liquids) interfacial field using a direct current discharge under a low gas pressure condition. It is clari...

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Bibliographic Details
Published in:Journal of applied physics 2009-05, Vol.105 (10), p.103306-103306-5
Main Authors: Kaneko, T., Baba, K., Hatakeyama, R.
Format: Article
Language:English
Subjects:
BEAMS
CATHODES
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CURRENTS
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRODES
ELECTRON EMISSION
ELEMENTS
EMISSION
EVAPORATION
ION BEAMS
IONS
METALS
NONMETALS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLASMA
PLASMA DIAGNOSTICS
PLASMA POTENTIAL
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE
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Summary:Due to the unique properties of ionic liquids such as their extremely low vapor pressure and high heat capacity, we have succeeded in creating the static and stable gas (plasmas)-liquid (ionic liquids) interfacial field using a direct current discharge under a low gas pressure condition. It is clarified that the ionic liquid works as a nonmetal liquid electrode, and furthermore, a secondary electron emission coefficient of the ionic liquid is larger than that of conventional metal electrodes. The plasma potential structure of the gas-liquid interfacial region, and resultant interactions between the plasma and the ionic liquid are revealed by changing a polarity of the electrode in the ionic liquid. By utilizing the ionic liquid as a cathode electrode, the positive ions in the plasma region are found to be irradiated to the ionic liquid. This ion irradiation causes physical and chemical reactions at the gas-liquid interfacial region without the vaporization of the ionic liquid.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3133213