High-efficiency electrical charger for nanoparticles

Alonso, M.; Huang, Chi-Fu

doi:10.1007/s11051-015-3137-8

Cited by 15 publications

(7 citation statements)

References 24 publications

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“…A series of theoretical and experimental studies have been conducted on the particle charging characteristics, and particle charging laws corresponding to various charging devices, particle size, and ionic density have been obtained. The precharge on aerosol particles increases the Coulomb force and shortens the length of the device's collection section, enables particles to be deposited onto the collection plate faster (Figure 3A) [68][69][70][71].…”

Section: Prechargementioning

confidence: 99%

Mechanisms, Techniques and Devises of Airborne Virus Detection: A Review

Chang¹,

Wang²,

Li³

et al. 2023

Preprint

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Airborne virus, such as COVID-19, caused pandemics all over the world. Virus-containing particles produced by infected individuals are suspended in the air for extended periods of time, actually results in viral aerosols and the spread of infectious diseases. Aerosol collection and detection devices are essential for limiting the spread of airborne virus diseases. This review provides an overview of the primary mechanisms and enhancement techniques for collecting and detecting airborne viruses. Indoor virus detection strategies for scenarios with varying ventilations are also summarized based on the excellent performance of existing advanced comprehensive devices. This review provides guidance for the development of future aerosol detection devices and aids in the control of airborne transmission diseases, such as COVID-19, monkeypox, and other airborne transmission viruses.

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Section: Prechargementioning

confidence: 99%

Mechanisms, Techniques and Devises of Airborne Virus Detection: A Review

Chang¹,

Wang²,

Li³

et al. 2023

Preprint

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“…By imposing an ion-driving Park et al (2009) + n/a n/a n/a n/a Kimoto et al (2010) + / - 3.0% at 3.4 nm (+) 4.2% at 3.4 nm (−) Qi et al (2007) Corona No n/a 5.4-9.0 × 10 6 6.1 at 4 nm (+) Han et al (2008) Carbon fiber ionizer No +2.3-4 kV 4.4-9.6 × 10 12 60% at 20 nm (+) Qi et al (2008) Corona No n/a n/a 19-80% at 10-50 nm (+) Tsai et al (2008) Corona Yes No n/a n/a 38.9-87.8% at 7-30 nm Domat et al (2014b) Corona No +2.0-4.5 kV n/a 24.9-81.5% at 9-40 nm (+) Alonso and Huang (2015) Corona No +2.8-3.5 kV n/a 4-48% at 4-10 nm (+) Fig. 8.…”

Section: Recent Progresses In Unipolar Charger Designmentioning

confidence: 99%

“…Experimental results indicated that varying the electrode gap distance is an efficient way to regulate the ion concentration, as well as the charging performance. Most recently, Alonso and Huang (2015) designed an electrical charger based on a point-to-plate DC corona discharge for particle charging below 10 nm. diameter below 10 nm.…”

Section: Recent Progresses In Unipolar Charger Designmentioning

confidence: 99%

Developments in Unipolar Charging of Airborne Particles: Theories, Simulations and Measurements

Zheng

Chang

Yang

et al. 2016

Aerosol Air Qual. Res.

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Charging of airborne particle is an important process in both scientific studies and industrial applications, of which the unipolar charging takes up the major part due to higher charging efficiency. In order to understand the charging mechanism of airborne particles, accordingly to predict the efficiency of unipolar chargers, different theoretical models have been proposed and investigated in all regimes. Numerical techniques have been also adopted by researchers to analyze the charging process of airborne particles and thus to model the unipolar chargers. On the other hand, with the advent and application of various measuring techniques, the electric charges measurement of airborne particles was made possible for researchers. In this work, we mainly present a summary of these models, numerical techniques and experimental results on unipolar charging in all regimes, as well as the recent developments in the design of unipolar chargers, trying to briefly overview the development in this research field.

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“…to reduce ion density heterogeneities in the charging volume), ion injection along the charging volume (Biskos, Reavell and Collings 2005;Hewitt 1957) or turbulent mixing of aerosol and ion (Medved et al 2000) have been successfully tested. Other simple, cheap and reliable post-corona diffusion chargers with a single ion injection can lead to initial ion density over 10 15 m -3 , targeted for specific applications like nanoparticle charging with limited particle losses for charging time shorter than 50 ms (Alonso and Huang 2015;Domat, Kruis and Fernandez-Diaz 2014a;Intra, Yawootti and Rattanadecho 2017). However, for particle size or concentration measurements of polydisperse aerosol, the size-charge relation should be independent of the aerosol concentration to calculate the concentration from charged aerosol current or to limit ambiguities in data inversion from mobility spectra to aerosol size distribution.…”

Section: Introductionmentioning

confidence: 99%

Effect of aerosol concentration on post-corona unipolar diffusion charging: Ion density retro-controlled by aerosol space charge versus geometry of ion-aerosol mixing

Jidenko

Bouarouri

Borra

2021

Aerosol Science and Technology

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The influence of aerosol concentration on the charge per particle is investigated in post-DC corona diffusion chargers for particle diameter between 10 nm and 1 µm. Particles are charged as they pass through the charger volume by collection of ions; the ion concentration decreases along the same path due to unipolar space charge repulsion and collection on walls. With crossflow of ions and aerosols, the final mean charge per particle decreases by up to one order of magnitude with increasing aerosol concentration from 10 9 to 10 11 m -3 . The evolution of the ion density profile along particle trajectories with aerosol concentration is shown to be due to the consumption of ions by aerosol charging and to ion dispersion by unipolar space charge repulsion including ions and charged particles. Both are investigated using a simplified 1.5D model with axial symmetry and homogeneous mixing of ions and aerosols. It is shown that, for a given operating condition, the aerosol space charge is responsible for the modification of the spatial ion distribution and the related lower Niand charge per particle reported at higher aerosol concentration. From calculations, we define the maximal aerosol concentration to keep the mean charge per particle unaffected by aerosol space charge in the optimal case of homogeneous mixing of ion and aerosol. Finally, the comparison of different ion-aerosol mixing conditions highlights that an axial symmetry of the charger reduces the influence of aerosol space charge. This effect of aerosol concentration on the particle charge is critical for aerosol chargers devoted to electric mobility selection for size measurements or focused electro-deposition, as well as for concentration measurements as performed using emerging low cost sensors based on corona chargers.

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High-efficiency electrical charger for nanoparticles

Cited by 15 publications

References 24 publications

Mechanisms, Techniques and Devises of Airborne Virus Detection: A Review

Mechanisms, Techniques and Devises of Airborne Virus Detection: A Review

Developments in Unipolar Charging of Airborne Particles: Theories, Simulations and Measurements

Effect of aerosol concentration on post-corona unipolar diffusion charging: Ion density retro-controlled by aerosol space charge versus geometry of ion-aerosol mixing

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