Removal of airborne particles by a tubular particle-removal device using UV/photoelectron method

Cho, Sang-Joon; Okuyama, Kikuo; Tamura, Takeo; Adachi, Motoaki; Fujii, Toshiaki

doi:10.1016/s0021-8502(96)00459-4

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…Th e ion current was measured with a precise electro meter (Mode l 65 14, Keithl ey, Cleveland, OH , USA ), which has a reso lution of I x 10-16 A. The ion co nce ntration in the indirect photoelect ric charge r, II i, was calculated fro m Equatio n (5) (Shimada et al 1997):…”

Section: Unipolar Diffusion Charging Using An Indirect Photo Electricmentioning

confidence: 99%

Effects of Particle Shape on the Unipolar Diffusion Charging of Nonspherical Particles

Park

Kim

2004

Aerosol Science and Technology

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Unipolar diffusion charging of nonspherical particles was investigated for various particle shapes. We researched with Ti0 2 agglomerates produced by the thermal decomposition of titanium tetraisopropoxide (TTIP) vapor. TTIP was converted into Ti0 2 in the furnace reactor and was subsequently introduced into the sintering furnace. Increasing the temperature in the sintering furnace, aggregates were restructured into higher fractal dimensions. The aggregates were classified according to their mobility using a differential mobility analyzer. The projection area and the mass fractal dimension of particles were measured with an image-processing technique performed by using transmission electron microscope (TEM) photographs. The selected aggregates were charged by the indirect photoelectric charger, and the average number of charges per particle was measured by an aerosol electrometer and a condensation particle counter. For particles of the same mobility diameter, our results showed that the particle charge quantity decreases as the sintering temperature increases. This result is understandable because particles with lower fractal dimension have larger capacitance and geometric surface area.

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Section: Unipolar Diffusion Charging Using An Indirect Photo Electricmentioning

confidence: 99%

Effects of Particle Shape on the Unipolar Diffusion Charging of Nonspherical Particles

Park

Kim

2004

Aerosol Science and Technology

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“…Radioactive materials [10], corona discharge [11], ultraviolet rays [12], and soft X-rays [13,14] are used to generate ions and charge aerosol particles into the well-known stationary charging state. However, as particle size becomes smaller, the charging ratio of the particles becomes smaller.…”

Section: Introductionmentioning

confidence: 99%

Highly charging of nanoparticles through electrospray of nanoparticle suspension

Suh

Han

Okuyama

et al. 2005

Journal of Colloid and Interface Science

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“…Experiments with such a setup are in progress. The configuration used by Shimada et al (1997), where a thin gold film is irradiated with UV light from one side and electrons are emitted to the other side, also could at least significantly reduce direct photoemission.…”

Section: Discussionmentioning

confidence: 99%

“…Later Oh et al (2004) used an indirect photoemission charger to investigate the effect of particle shape on the charging efficiency. Shimada et al (1997Shimada et al ( , 1999 used indirect photoemission to charge particles for electrostatic precipitation. Even if some earlier work exists, where this technique has been applied, it never has been investigated thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Charging of Ultra-Fine Aerosol Particles by an Ozone-Free Indirect UV Photo-Charger

Grob

Burtscher

2013

Aerosol Science and Technology

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Particle charging by indirect photoemission may be an alternative to charging methods based on corona discharge or on bipolar charging by radioactive ion sources. An indirect charger using a low energy UV radiation is introduced and characterized in detail. Depending on the carrier gas, photoelectrons or ions formed by electron-attachment charge the particles by diffusion charging. The achieved charging efficiency is in the range of 20-70% for particle sizes of 20 to 100 nm. It can easily be modulated by a small voltage applied to the photoemitter. To achieve stable electron emission, glassy carbon with its very inert surface is used as photoemitter. Particle losses are very small. The charge distribution has been measured by a tandem DMA setup. The experimental results are compared with the theory of unipolar diffusion charging based on the Fuchs' combination probability of ions with the particles. The charger characterization has been performed by carbon particles in a size range of 20-100 nm, produced by a spark discharge generator.

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Removal of airborne particles by a tubular particle-removal device using UV/photoelectron method

Cited by 14 publications

References 15 publications

Effects of Particle Shape on the Unipolar Diffusion Charging of Nonspherical Particles

Effects of Particle Shape on the Unipolar Diffusion Charging of Nonspherical Particles

Highly charging of nanoparticles through electrospray of nanoparticle suspension

Charging of Ultra-Fine Aerosol Particles by an Ozone-Free Indirect UV Photo-Charger

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