Characteristics of Aerosol Charge Distribution by Surface-Discharge Microplasma Aerosol Charger (SMAC)

Kwon, Soon−Bark; Fujimoto, Toshiyuki; Kuga, Yoshikazu; Seto, Takafumi

doi:10.1080/02786820500380263

Cited by 19 publications

(7 citation statements)

References 24 publications

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“…This considerably increases the complexity of the device. Many other alternative approaches using AC corona discharge (Zamorani and Ottobrini 1978;Stommel and Riebel 2004), soft X-ray photoionization (Shimada et al 2002), and surface dielectric barrier discharge (Kwon et al 2005) have been developed that eliminate the need for ion transport flow and dilution problems. However, these approaches involve either considerable degree of complexity with respect to their operation or rely on bulky, large, or expensive hardware that prevents their use in field-portable, compact instrumentation.…”

Section: Introductionmentioning

confidence: 99%

Miniature Dual-Corona Ionizer for Bipolar Charging of Aerosol

Kulkarni

2013

Aerosol Science and Technology

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A corona-based bipolar charger has been developed for use in compact, field-portable mobility size spectrometers. The charger employs an aerosol flow cavity exposed to two corona ionizers producing ions of opposite polarity. Each corona ionizer houses two electrodes in parallel needle-mesh configuration and is operated at the same magnitude of corona current. Experimental measurement of detailed charge distribution of near-monodisperse particles of different diameter in the submicrometer size range showed that the charger is capable of producing well-defined, consistent bipolar charge distributions for flow rates up to 1.5 L/min and aerosol concentration up to 10 per cm. For particles with preexisting charge of +1, 0, and -1, the measured charge distributions agreed well with the theoretical distributions within the range of experimental and theoretical uncertainties. The transmission efficiency of the charger was measured to be 80% for 10 nm particles (at 0.3 L/min and 5 A corona current) and increased with increasing diameter beyond this size. Measurement of uncharged fractions at various combinations of positive and negative corona currents showed the charger performance to be insensitive to fluctuations in corona current. Ion concentrations under positive and negative unipolar operation were estimated to be 8.2 × 10 and 3.37 × 10 cm for positive and negative ions; the · product value under positive corona operation was independently estimated to be 8.5 × 10 s/cm. The ion concentration estimates indicate the charger to be capable of "neutralizing" typical atmospheric and industrial aerosols in most measurement applications. The miniature size, simple and robust operation makes the charger suitable for portable mobility spectrometers.

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Section: Introductionmentioning

confidence: 99%

Miniature Dual-Corona Ionizer for Bipolar Charging of Aerosol

Kulkarni

2013

Aerosol Science and Technology

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“…More recently, aerosol injection in AC polarized dielectric barrier discharges (DBD), producing bipolar ions has been studied for their potentialities as aerosol chargers (Jidenko 2004;Kwon et al 2005;Wild et al 2007;Borra et al 2009). The main drawbacks of these bipolar chargers are the distortion of the size distribution due to gas heating during the transit in the discharge gap, ozone and particles production (Kogelschatz 2003;Borra et al 2015), and the discharge destabilization by aerosol collection when aerosol is injected in the discharge gap (Jidenko and Borra 2012).…”

Section: Introductionmentioning

confidence: 99%

Ozone-free post-DBD aerosol bipolar diffusion charger: Evaluation as neutralizer for SMPS size distribution measurements

Mathon

Jidenko

Borra

2016

Aerosol Science and Technology

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A postplasma neutralizer for submicron particles size measurements by mobility analysis has been evaluated. Bipolar ion currents have been measured downstream a dielectric barrier discharge (DBD) to estimate the ion fluxes at the inlet of charging volume and the n i ¢t product that define the theoretical maximal concentration that can be neutralized. Charge distributions were measured versus DBD voltage, aerosol diameter and concentration for monodisperse aerosols. It is confirmed that the charge distribution of particles depends on the ratio of initial positive and negative ion currents controlled by the DBD voltage leading to a tuneable mean charge of aerosol in this post-DBD bipolar charger. As expected from Gunn's law, the mean charge and the variance are proportional to particle diameter above 50 nm and independent of the aerosol concentration. The size distributions measured with 85 Kr and post-DBD neutralizer present the same modal diameters and a maximal overestimation of the total concentration of 10%, for aerosol from 15 to 730 nm with concentrations up to 6 £ 10 12 m ¡3. This post-DBD bipolar charger can be used for submicron aerosol neutralization and thus for scanning mobility particle sizer size distribution measurements in air as well as in nitrogen to suppress ozone downstream DBD.

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“…The surface polarization of the dielectric barrier prevents the formation of spark but involves an alternative power supply (typically a few kV at 50 Hz to 1 MHz) [5][6][7][8][9]. DBD has been applied to the electrostatic charging of aerosol by collection of gaseous ions [10][11][12] and to the collection of aerosol particles [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Self-cleaning, maintenance-free aerosol filter by non-thermal plasma at atmospheric pressure

Jidenko

Borra

2012

Journal of Hazardous Materials

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Two lab-scale self-cleaning filters based on dielectric barrier discharges in air at atmospheric pressure have been developed and tested. Experimental results on aerosol removal by charging and electro-collection are presented versus plasma and hydrodynamic parameters for monodisperse aerosol from 20 nm to 1.2 μm. For classical atmospheric aerosol, the average mass and number filtration efficiencies exceed 95% and 87%, respectively in the most penetrating size range (100-700 nm). The frequency of the applied voltage controls the amplitude of the oscillation of charged particle and can be adjusted to favour either filtration or cleaning. Low frequency (1 kHz) is suitable for electro-collection, while high frequency (60 kHz) is favourable for filter cleaning. Electrical characterization and filter efficiency are two indicators of the filter loading. The durations of both filtration step at maximal efficiency and cleaning step depends on the deposited mass, the surface input power and subsequent dielectric surface temperature.

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Characteristics of Aerosol Charge Distribution by Surface-Discharge Microplasma Aerosol Charger (SMAC)

Cited by 19 publications

References 24 publications

Miniature Dual-Corona Ionizer for Bipolar Charging of Aerosol

Miniature Dual-Corona Ionizer for Bipolar Charging of Aerosol

Ozone-free post-DBD aerosol bipolar diffusion charger: Evaluation as neutralizer for SMPS size distribution measurements

Self-cleaning, maintenance-free aerosol filter by non-thermal plasma at atmospheric pressure

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