Development of a Large Annular-Type DMA and Evaluation of Its Classification Property

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  • KOYAMA Hiromi
    Shibata Scientific Technology LTD.
  • IKAWA Seiji
    Shibata Scientific Technology LTD.
  • MYOJO Toshihiko
    Department of Pneumology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health
  • OKUYAMA Kikuo
    Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University

Bibliographic Information

Other Title
  • 大容量微分型静電分級器（ＤＭＡ）の開発と分級性能評価
  • ダイヨウリョウ ビブンガタ セイデン ブンキュウキ DMA ノ カイハツ ト ブンキュウ セイノウ ヒョウカ

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Abstract

We have developed a large annular-type differential mobility analyzer (DMA) , having outer electrode diameter of 100 mm to increase the sampling flow rate of size-classified aerosols up to 30 L/min. In order to calibrate this new DMA, three types of monodisperse polystyrene latex (PSL) particles with nominal diameter ranging from 28 to 100 nm were used as standard particles. PSL particles suspended in distilled water were aerosolized by a nebulizer and then introduced into the DMA. The mean diameters and standard deviations of these PSL particles were calculated by Ehara's method (Ehara, K. et al., Aerosol Sci. Technol., 32, 434-452 (2000) ) and compared with their nominal diameters and uncertainties. Nominal and measured diameters are in good agreement. These resutls indicate that this DMA is useful to classify large volume of nanometer-sized aerosols and for further measurements such as chemical analysis of particulate materials or inhalation experiments.

Journal

  • Earozoru Kenkyu

    Earozoru Kenkyu 22 (1), 48-53, 2007

    Japan Association of Aerosol Science and Technology

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