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http://dx.doi.org/10.3795/KSME-B.2006.30.2.186

Characteristics of Unipolar Charging of the Submicron Particles by the Condensation-Evaporation Method  

Choi, Young-Joo (한국과학기술원 기계공학과)
Kim, Sang-Soo (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.30, no.2, 2006 , pp. 186-192 More about this Journal
Abstract
We applied a new charging system using the condensation and evaporation method to charge the submicron particles with a uniform charging performance. The monodispersed NaCl submicron particles were condensed by n-butanol vapor and grew up to micron droplets with a same size, regardless of their initial size. Those condensed droplets were charged in an indirect corona charger. The indirect corona charger consisted of the ion generation zone and the particle charging zone. In the ion generation zone, Ions were generated by corona discharge and some of them moved into the particle charging zone by a carrier gas and mixed with the condensed droplet. And finally, the charged and condensed droplets dried through an evaporator to shrink to their original size. The average charge and penetration rate of the particles before and after evaporation were measured by CPC and aerosol electrometer and compared with those of a conventional corona charger. The results showed that the average charge was $5\~7$ charges and the penetration rate was over $90\%$, regardless of the initial particle size.
Keywords
Condensation-Evaporation Method; Indirect Corona Charger; Unipolar Charging;
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1 Buscher, P., Ott, A. S. and Wiedensohler, A., 1994, 'Performance of a Unipoar Square Wave Diffusion Charger with Variable Nt-product,' J. Aerosol Sci., Vol. 25, pp. 651-663   DOI   ScienceOn
2 Park, S. H., Lee, K. W., Shimada, M. and Okuyama, K., 2002, 'Change in Particle Size Distribution of Aerosol Undergoing Condensational Growth: Alternative Analytical Solution for the Low Knudsen Number Regime,' J. Aerosol Sci., Vol. 33, pp. 1297-1307   DOI   ScienceOn
3 Choi, Y. J. and Kim, S. S., 2004, 'Unipolar Charging of Submicron Particles Using the Condensation and Evaporation Method,' The 5th Korean conference on aerosol and particle technology, pp.209-210
4 Suh, J. S., Han, B. W., Kim, D. S. and Choi, M. S., 2005, 'A Method for Enhanced Charging of Nano Particles via Condensation Magnification,' J. Aerosol Sci., Article in press   DOI   ScienceOn
5 Friedlander, S. K., 2000, Smoke, Dust, and Haze-Fundamentals of Aerosol Dynamics, Oxford Press
6 Sierra, A. H., Alguacil, F. J. and Alonso, M., 2003, 'Unipolar Charging of Nanometer Aerosol Particles in a Corona Ionizer,' J. Aerosol Sci., Vol. 34, pp. 733-745   DOI   ScienceOn
7 Kruis, F. E. and Fissan, H., 2001, 'Nanoparticle Charging in a Twin Hewitt Charger,' J. Nanopart. Res., Vol. 3, pp. 39-50   DOI   ScienceOn
8 Jeong, H. J. and Kim, S. S., 2001, 'Condensational Growth of Particles Through Expansion in a Capillary Tube,' Ph Thesis, KAIST
9 Park, S. H. and Lee, K. W., 2000, 'Condensational Growth of Polydisperse Aerosol for the Entire Particle Size Range,' Aerosol Sci. Tech., Vol. 33, pp. 222-227   DOI   ScienceOn
10 Wiedensohler, A., Buscher, P., Hansson, H. C., Martinsson, B. G., Ferron, F. O. and Busch, B., 1994, 'A Novel Unipolar Charger for Ultrafine Aerosol Particles with Minimal Particle Losses,' J. Aerosol Sci., Vol. 34, pp. 639-649   DOI   ScienceOn
11 Chen, D. R. and Pui, D. Y. H., 1999, 'A High Efficiency, High Throughput Unipolar Aerosol for Nanoparticles,' J. Nanopart. Res., Vol. 1, pp. 115-126   DOI
12 Medved, A., Dorman, F., Kaufman, S. L. and Pocher, A., 2000, 'A New Corona-based Charger for Aerosol Particles,' J. Aerosol Sci., Vol. 31, Suppl 1, pp. 616-617   DOI   ScienceOn