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Generation and characterization of field-emitting surface dielectric barrier discharges in liquids
Ist Teil von
Journal of applied physics, 2018-01, Vol.123 (4)
Ort / Verlag
Melville: American Institute of Physics
Erscheinungsjahr
2018
Link zum Volltext
Quelle
AIP Journals (American Institute of Physics)
Beschreibungen/Notizen
Field-emitting surface dielectric barrier discharges (FESDBDs), previously generated in CO2 from high pressures up to supercritical conditions using 10 kHz ac excitation, were investigated in non-aqueous liquid CO2 and liquid silicone oil. In both liquids, the maximum amount of negative charge Q−deposited as a function of the applied voltage amplitude was consistent with the Fowler–Nordheim equation, which demonstrated the presence of field emission. Furthermore, purely continuum optical emission spectra attributable to electron-neutral bremsstrahlung were confirmed. The fact that these characteristics were identical to those in high-pressure CO2 reported from previous research shows that FESDBDs can be generated independently of the medium type and that they are low-power (on the order of 10 mW) discharges. To investigate the charging function of FESDBDs, the motion of fine particles suspended above the FESDBDs was studied by high-speed imaging. It revealed that the speed of fine particles affected by the FESDBDs depends on the particle size, the FESDBDs' function being to charge fine particles.