Abstract
Results of experimental measurements of the electrical charge acquired by aerosols exposed to unequal current densities of positive and negative ions are presented. Highly monodisperse polystyrene aerosols ranging in size from 0.3 to 1.1 μm in diameter are exposed to air ions in the presence of electric fields between 100 and 500 V/cm. Mean aerosol charge is determined by integral mobility analysis. Charge levels are found to depend on particle size, ion current density ratio, electric field strength, and the product of ion conductivity and charging time. Time-dependent behavior is characterized by the accumulation of a steady-state level of charge. Diffusion charge is obtained by extrapolation of data obtained in low fields to E = 0. Classical diffusion theory and experiment are in close agreement for the unipolar case and for steady-state bipolar conditions at low current density ratios, but differ slightly under bipolar transient conditions.
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