Abstract
The mass transfer rate of ammonium nitrate between the aerosol and gas phases was quantified experimentally by the use of the TDMAISMPS (Tandem Differential Mobility Analyzer/Scanning Mobility Particle Sizer) technique. Experiments were run for both pure and covered with organic films particles. Fresh, ammonium nitrate particles with initial diameters in the submicrometer regime were produced and evaporated in purified air under temperatures of 20 to 40°C and relative humidities of 10 to 80%. Particles were coated with various film thicknesses by exposing the ammonium nitrate particles to an air stream supersaturated with an organic vapor. A differential mobility analyzer was used to extract a nearly monodisperse aerosol which was allowed to evaporate for approximately 30 seconds in an evaporator. A SMPS system was used to measure the size distribution of the evaporated particles with and without the organic coating.
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