Electrical charging of aerosol nanoparticles and some practical applications

Alonso, M.; Hernández-Sierra, A.

doi:10.3989/revmetalm.2003.v39.i1.316

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…The higher flow rate case is dominated by the pressure-driven flow as indicated by the parameter X . As the residence time decreases, the transmission efficiency of 10 nm particle increases from 29% to 75% and decreases for the sizes up to 85 nm and then increases, which similar to previously reported results (Zhuang, Jin Kim et al 2000, Alonso, Hernandez-Sierra et al 2003, Li and Christofides 2006, Lin and Tsai 2010, Dey and Venkataraman 2012.…”

Section: Particle Transmissionsupporting

confidence: 91%

“…These low transmission efficiencies indicate that in EHD flow 10 nm particle acquire charge with a higher probability that has been reported. Previous research (Fuchs 1947, Fuchs 1963, Zhuang, Jin Kim et al 2000, Alonso, Hernandez-Sierra et al 2003, Li and Christofides 2006, Lin and Tsai 2010 suggests that only a small fraction of particles is charged when the particle diameter is less than 30 nm. For example, according to classical diffusion charging models (Fuchs 1947, Pui, Fruin et al 1988, Li and Christofides 2006, 12% -37% of 10 nm particle would acquire charges by the thermal ions, and the contribution of the field charging is negligible for this particle size.…”

Section: Particle Transmissionmentioning

confidence: 98%

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Behavior of ultrafine particles in electro-hydrodynamic flow induced by corona discharge

Vaddi

Guan

Novosselov

2020

Journal of Aerosol Science

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Ultrafine particle behavior in electro-hydrodynamic (EHD) flow induced by corona discharge is studied experimentally and numerically. The EHD flow serves as a primary particle aspiration/ sampling mechanism, the collector does not require any additional flow generation. Multiphysics numerical model couples the ion transport equation and the Navier-Stokes equations (NSE) to solve for the spatiotemporal distribution of electric field, charge density, and flow field, the results are compared with experimental velocity profiles at the exit. The computed velocity and flow rate data are in good agreement with the experimental data; the maximum velocity is located at the axis and ranges from 1 m/s to 4 m/s as a function of corona voltage. Experimentally evaluated particle transmission trends for ambient and NaCl nanoparticles particles in the 20 nm -150 nm range are in good agreement with the theoretical models. However, for particles in the 10 nm -20 nm size range, the transmission is lower due to the increased particle charging resulted from their exposure to the high-intensity electric field and high charge density in the EHD driven flow. These conditions yield a high probability of particles below 20 nm to acquire and hold a unit charge. The transmission is lower for smaller particle (10 nm) due to their high charge to mass ratio, and it increases as the single-charged particles grow in mass up to 20 nm, resulting in their lower electrical mobility. For particles larger than 20 nm, the electrical mobility increases again as they can acquire multiple charges. The results shed insight into interaction of nanoparticle and ions in high electrical field environment, that occur in primary EHD driven flows and in the secondary flows generated by corona discharge.

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Section: Particle Transmissionsupporting

confidence: 91%

Section: Particle Transmissionmentioning

confidence: 98%

Behavior of ultrafine particles in electro-hydrodynamic flow induced by corona discharge

Vaddi

Guan

Novosselov

2020

Journal of Aerosol Science

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“…The spectra of ions electrical mobilities, the evolution with the applied voltage and the ion ageing in the charger are neglected. The mean mass of ion is mi = 80 AMU (Alonso, Hernandez-Sierra and Alguacil 2003). The relative dielectric permittivity of the particles is 4 (rDEHS = 4 and rNaCl = 5.9).…”

Section: Aerosol Charge Calculation and Charging Theorymentioning

confidence: 99%

Post-corona unipolar chargers with tuneable aerosol size-charge relations: Parameters affecting ion dispersion and particle trajectories for charger designs

Jidenko

Bouarouri

Gensdarmes

et al. 2020

Aerosol Science and Technology

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This paper focusses on the mean charge per particle of monodisperse submicron aerosol, charged by diffusion of unipolar ions in post-corona discharge. It aims to confirm and discuss the limits of considering a single value of Ni•t to describe aerosol charging and then to present methods to control the size-charge relation. Three aerosol chargers, with different mixings of ion and aerosol flows are investigated. Despite comparable ion sources with discharge currents of a few tens of µA, the size-charge relations differs from one charger to another due to different ion-aerosol mixing conditions and subsequent ion density along particles trajectories. Discrepancies are even more noticeable as the particle size increases. Discharge current, velocities of ion and aerosol flows and electric field control post-discharge ion density in each point of the charging volume. The control of particle trajectory in expanding unipolar ion cloud, leads to tuneable size-charge relations. Aerosol inertia and charging dynamics, that both depends on particle size, affects the Ni•t experienced by the particle and thus the final charge of the particle. Operating conditions to reach a constant mean charge for particles larger than 200 nm are reported. Conclusions provide a basis to design aerosol chargers devoted to electric mobility selection for aerosol deposition, separation or electrical measurements especially to overcome the limits of mobility-to-size data inversion due to multiple charge ambiguity using diffusion chargers.

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Unipolar charging of nanoparticles by the Surface-discharge Microplasma Aerosol Charger (SMAC)

Kwon

Seto

2006

J Nanopart Res

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Electrical charging of aerosol nanoparticles and some practical applications

Cited by 5 publications

References 2 publications

Behavior of ultrafine particles in electro-hydrodynamic flow induced by corona discharge

Behavior of ultrafine particles in electro-hydrodynamic flow induced by corona discharge

Post-corona unipolar chargers with tuneable aerosol size-charge relations: Parameters affecting ion dispersion and particle trajectories for charger designs

Unipolar charging of nanoparticles by the Surface-discharge Microplasma Aerosol Charger (SMAC)

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