Effect of wall surface materials on deposition of particles with the aid of negative air ions

Wu, Chuanchen; Lee, Whei‐May Grace; Cheng, Po Ching; Yang, Shu; Yu, Kuo Pin

doi:10.1016/j.jaerosci.2005.05.018

Cited by 32 publications

(23 citation statements)

References 28 publications

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“…Daniels (2002) reported that negative air ions (NAIs) reduce aerosol particles, airborne microbes, odors and volatile organic compounds (VOCs) in indoor air. The removal efficiency of aerosol particles using NAIs is studied by various workers (Grabarczyk, 2001;Wu and Lee, 2003;Wu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Effect of Negative Air Ions on Fog and Smoke

Sawant¹,

Meena

Jadhav

2012

Aerosol Air Qual. Res.

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A negative electric discharge voltage generator (NAI Generator) was designed and used to investigate the possibility of reducing (neutralizing) fog, dhoop smoke, and vehicle smoke collected in closed glass containers. The experiment was carried out in a dark room, and two identical glass containers were used. Various sensitivity tests were carried out with fog and smoke. Light intensity was measured for each run as a function of time with and without a negative air ion generator. Negative air ions attach to particulate matter to enhance visibility. At a high negative ion emission rate, the particle mobility becomes sufficient so that particle migration results in their deposition on walls and other indoor surfaces. The performance characteristics of the negative electric discharge generator designed in this work, which produces uni-polar ions by corona discharge at a relatively high emission rate, were evaluated. This device, if operated continuously for six minutes, resulted in the removal of about 93% to 97% of the particles in the glass container, in addition to the natural decay effect. The rate of change of particle removal was higher for fog than for smoke. This study demonstrates that it is possible to neutralize and reduce the concentration of fog and smoke to a significant degree using negative air ions, resulting in increasing visibility in a closed chamber.

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Section: Introductionmentioning

confidence: 99%

Effect of Negative Air Ions on Fog and Smoke

Sawant¹,

Meena

Jadhav

2012

Aerosol Air Qual. Res.

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“…Table 2 shows the comparison of enhancement factors between this study and previous ones. According to Wu et al (2006), the EF is related to the wall materials. In accordance with the result of Grinshpun's group, the EF would increase with the increase of ion concentration (Lee et al, 2004;Grinshpun et al, 2005).…”

Section: à2mentioning

confidence: 99%

“…Numerous previous studies have demonstrated that negative air ions (NAIs) can charge the airborne particles and then the charged particles can be deposited more rapidly than the uncharged ones due to the electrostatic force (Grabarczyk, 2001;Lee et al, 2004;Mayya et al, 2004;Grinshpun et al, 2005;Wu et al, 2006;Grinshpun et al, 2007;Yu et al, 2008). However, most NAI generators on the market may emit ozone and then result in the increase of the mass concentration of ultrafine (nano-scale) and fine particles in the presence of biogenic volatile organic compounds (BVOCs), such as terpenoids, limonene, a-pinene, and b-pinene, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing evidence has shown that the alveolar-deposited nanoparticles can translocate into the bloodstream of humans rapidly (Nemmar, 2002) and then into other organs such as the liver via the systemic circulation (Nemmar, 2002;Oberdörster et al, 2002;Vallyathan and Gwinn, 2006). On the other hand, the NAI concentration and electric field strength generated by the NAI generator, and the particle sizes, significantly affect the efficiency of the deposition of airborne particles (Grabarczyk, 2001;Lee et al, 2004;Wu et al, 2006). Therefore, it is necessary to validate the effectiveness of NAI generator on the deposition of ultrafine secondary organic aerosols (SOAs).…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the deposition of ultrafine secondary organic aerosols by the negative air ion and the effect of relative humidity

Yu¹

2012

Journal of the Air & Waste Management Association

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Deposition is an important process for the removal of aerosol particles. Negative air ion (NAI) generators can charge the ultrafine airborne particles and enhance their deposition rate. However, many NAI generators may also emit ozone and increase the concentration of particles in the presence of biogenic volatile organic compounds owing to the secondary organic aerosol (SOA) production. To validate the effectiveness of NAI generator, the authors investigated the enhancement effect of an NAI generator on the deposition of the ultrafine SOAs generated from the ozonolysis of d-limonene in a test chamber under controlled ventilation rate and relative humidity (RH). The experimental results demonstrated that compared with other effects, including the gravity, particle eddy diffusion, and the Brownian diffusion, the effect of NAIs is the most dominate one on the deposition of SOA particles onto the wall surface in the near-wall region (<1 cm away from the wall). According to these experiments, the tested NAI generator could efficiently enhance the deposition rate by an enhancement factor ranging from 8.17 AE 0.38 to 25.3 AE 1.1, with a low ozone production rate. This NAI generator had better performance on the deposition of the SOAs with smaller particle sizes and it performed even better under higher RH. The enhancement effect of the NAI generator was related to its high NAI production and electric field strength.Implications: This study investigated a novel technique of negative air ion (NAI) generator that can enhance the precipitation of nano-scale secondary organic aerosol (SOA). The tested NAI generator can significantly improve the deposition rate of SOA with an enhancement factor of about 8.17 AE 0.38 to 25.3 AE 1.1. The enhancement factor rose when relative humidity increased.

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“…The particle removing mechanisms by NAI is due to particle charging by emitted ions and electromigration [10], [12], [15]. Several studies have been conducted for particle removing efficiency using ionic cleaners to remove particles from the air [3], [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Control of Respirable Particles in Indoor Air with Portable Negative Air Ion Generator

Sawant¹

2013

IOSR-JESTFT

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Effect of wall surface materials on deposition of particles with the aid of negative air ions

Cited by 32 publications

References 28 publications

Effect of Negative Air Ions on Fog and Smoke

Effect of Negative Air Ions on Fog and Smoke

Enhancement of the deposition of ultrafine secondary organic aerosols by the negative air ion and the effect of relative humidity

Control of Respirable Particles in Indoor Air with Portable Negative Air Ion Generator

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