Title: Electrostatic charge measurement and charge neutralization of fine aerosol particles during the generation process
Authors: Tsai, CJ
Lin, JS
Deshpande, CG
Liu, LC
Institute of Environmental Engineering
Keywords: aerosol charge analyzer;charge equilibrium;charge neutralizer;condensation aerosols;electrostatic charge;evaporation aerosols
Issue Date: 1-Apr-2006
Abstract: An aerosol charge analyzer has been constructed to measure the charge distribution of NaCl particles generated in the laboratory. A radioactive electrostatic charge neutralizer utilizing Po-210 was used to neutralize the electrostatic charge of the particles. The atomization technique was used to generate NaCl particles with diameters of 0.2 to 0.8 mu m, while the evaporation and condensation method was adopted to generate particles of 0.01 to 0.2 mu m in diameter. The experimental data demonstrates that the absolute average particle charge depends on the particle diameter, and is higher than that calculated by the Boltzmann charge equilibrium for particles within the range of 0.2 to 0.8 mu m. The charge increases with decreasing NaCl concentration. When these particles are neutralized using the Po-210 neutralizer, it is found that the electrostatic charge reaches the Boltzmann charge equilibrium. For 0.01. to 0.2 mu m NaCl particles generated using the evaporation and condensation method, test results show that the absolute average particle charge is higher than that calculated by the Boltzmann charge equilibrium for particles larger than 0.03 to 0.05 mu m in diameter, while it is lower than that predicted by the Fuchs theory [1], for particles smaller than 0.03 to 0.05 mu m. However, after charge neutralization, particles with diameter above 0.05 mu m reach the Boltzmann charge equilibrium condition, and the charges for particles with diameters of 0.010 to 0.05 mu m, agree well with Fuchs' theory.
URI: http://dx.doi.org/10.1002/ppsc.200500961
ISSN: 0934-0866
DOI: 10.1002/ppsc.200500961
Volume: 22
Issue: 5
Begin Page: 293
End Page: 298
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