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Division of Environmental Physics - User: anka
Faculty of Mathematics, Physics and Informatics, Comenius University Bratislava


Low temperature plasmas and electrosprays, topical review

Jaworek A., Gañán-Calvo A.M., Machala Z.
J. Phys. D: Appl. Phys. 52, 233001 (2019)

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Abstract:

The paper reviews the state of the art in the field of interaction of low temperature plasmas generated during electrospraying with the liquid cone and jet. Many studies are focused at practical applications of electrospraying, for example to mass spectrometry, electrospinning of nanofibers, thin film deposition, nanoparticle production, ink-jet printing, etc., but the phenomenon of electrically generated plasma due to gas ionization accompanying the electrospraying is frequently ignored. The effect of electrical discharge on the electrospraying process depends on the type of the discharge. When glow corona or onset streamers are generated, the electrospray is stabilized in the classical cone-jet mode, however, for breakdown streamers, sparks, or arc discharges, the electrospraying process is disturbed and irregular modes (spindle, multispindle or ramified jet) occur. The electrospray-discharge interaction phenomena have been studied by photographic recording, electric current measurements, mass spectrometry and optical emission spectroscopy. Some studies show that the current carried by the ions generated in this plasma and flowing through the drift region to the opposite electrode can be higher than the current carried by the electrosprayed droplets. This effect has been proved by separation of both currents using a specially designed device. To prevent the distortion of the electrospray process, various strategies have been developed: modification of the electric field in the vicinity of capillary nozzle, stabilization of the glow corona, reduction of the surface tension of liquid. Recently, the physical processes and phenomena occurring in electrical discharge plasmas during electrospraying of liquids find new application in decontamination of liquids or in material processing. The advantage of coupled electrospray-plasma process is that the liquid atomization is combined with plasma chemical processes within the same device, by using the same power supply applied to the capillary nozzle.


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