Charging efficiency of nanoparticles in needle-to-plate chargers with micro discharge gaps

Yang, Wenming; Zhu, Rong; Wang, Liangqi; Liu, Beiying

doi:10.1007/s11051-019-4572-8

Cited by 4 publications

(1 citation statement)

References 43 publications

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“…Since 1970, more than 25 unipolar aerosol chargers based on electrical discharges have been reported in the literature (Chen et al 2018;Intra and Tippayawong 2011;Zheng et al 2016). Most of them have been developed for aerosol measurement apparatus either for concentration (Bémer and Bau 2019;Timo et al 2011) or for aerosol size distribution (Biskos, Reavell and Collings 2005;Yang et al 2019).…”

Section: Discussionmentioning

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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