Development and performance test of a unipolar diffusion charger for real-time measurements of submicron aerosol particles having a log-normal size distribution

D. Park, M. An, Jungho Hwang

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31 Citations (Scopus)

Abstract

We designed and evaluated a unipolar diffusion charger. This charger consisted of a corona discharge, mixing, and ion trap zones. For the performance evaluation of the diffusion charger, sodium chloride (NaCl) particles smaller than 0.1 μ m in diameter, and dioctyl sebacate (DOS) particles of 0.1-0.7 μ m, were used. The diffusion charger was evaluated with two parameters. One parameter was particle loss and the other parameter was charging characteristics which were the product of penetration and average number of charges (P · n). The parameters were measured by varying values of the voltage applied to the diffusion charger. The total particle losses were below 15%. The number of charges was almost linear with respect to the particle diameter. In order to reduce the time required to obtain the desired particle size distribution in the laboratory experiments, we estimated the geometric mean diameter and the log-normal size distribution of the generated submicron particles by using a diffusion charger as well as a condensation particle counter (CPC, TSI model 3025A) and an aerosol electrometer (TSI model 3068A). The estimated size distribution can be used for real-time measurements after calibration.

Original languageEnglish
Pages (from-to)420-430
Number of pages11
JournalJournal of Aerosol Science
Volume38
Issue number4
DOIs
Publication statusPublished - 2007 Jan 1

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Time measurement
Aerosols
Particles (particulate matter)
aerosol
Electrometers
Radiation counters
Sodium chloride
Sodium Chloride
Particle size analysis
Condensation
sodium chloride
test
particle
Calibration
Ions
corona
condensation
penetration
Electric potential
particle size

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

Cite this

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abstract = "We designed and evaluated a unipolar diffusion charger. This charger consisted of a corona discharge, mixing, and ion trap zones. For the performance evaluation of the diffusion charger, sodium chloride (NaCl) particles smaller than 0.1 μ m in diameter, and dioctyl sebacate (DOS) particles of 0.1-0.7 μ m, were used. The diffusion charger was evaluated with two parameters. One parameter was particle loss and the other parameter was charging characteristics which were the product of penetration and average number of charges (P · n). The parameters were measured by varying values of the voltage applied to the diffusion charger. The total particle losses were below 15{\%}. The number of charges was almost linear with respect to the particle diameter. In order to reduce the time required to obtain the desired particle size distribution in the laboratory experiments, we estimated the geometric mean diameter and the log-normal size distribution of the generated submicron particles by using a diffusion charger as well as a condensation particle counter (CPC, TSI model 3025A) and an aerosol electrometer (TSI model 3068A). The estimated size distribution can be used for real-time measurements after calibration.",
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AB - We designed and evaluated a unipolar diffusion charger. This charger consisted of a corona discharge, mixing, and ion trap zones. For the performance evaluation of the diffusion charger, sodium chloride (NaCl) particles smaller than 0.1 μ m in diameter, and dioctyl sebacate (DOS) particles of 0.1-0.7 μ m, were used. The diffusion charger was evaluated with two parameters. One parameter was particle loss and the other parameter was charging characteristics which were the product of penetration and average number of charges (P · n). The parameters were measured by varying values of the voltage applied to the diffusion charger. The total particle losses were below 15%. The number of charges was almost linear with respect to the particle diameter. In order to reduce the time required to obtain the desired particle size distribution in the laboratory experiments, we estimated the geometric mean diameter and the log-normal size distribution of the generated submicron particles by using a diffusion charger as well as a condensation particle counter (CPC, TSI model 3025A) and an aerosol electrometer (TSI model 3068A). The estimated size distribution can be used for real-time measurements after calibration.

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