Abstract
Systematic investigation of physical properties of electrical mobility classified aerosols is reported. Physical properties such as size distributions, mobility distributions, and the ratio of singly to doubly charged fractions were determined theoretically and experimentally. Fused aluminosilicate particles with well-defined physical characteristics were generated in an electrostatic classifier. The classified monodisperse aerosols were collected on copper electron microscope grids by an electrostatic precipitator and examined in a transmission electron microscope. The size distribution and singly to doubly charged ratio were determined directly from the electron micrographs, and the mobility distribution was deduced. The theoretical and experimental results agreed to within ± 10%. If the doubly charged fraction is substantial, corrections should be made. Both the effective mean diameter and the geometric standard deviation are functions of the ratio of singly to doubly charged fractions and can be accurately calculated. Based on these results the physical properties can be theoretically predicted. This is useful in many applications of classified aerosols.
Published Version
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