Figures & data
FIG. 1 Mobility distribution density of 1-, 2-, and 3-fold charged components of PA and the DMA transfer function H. The transfer function is considered to be triangular (CitationTammet 1970; CitationStolzenburg 1988; CitationStratmann et al. 1997) and, for the better illustration of the multiple charge problem, it is shown relatively broader than it is in real experiments.
FIG. 2 Block diagram of the experiment setup. The position of the neutralizer in different setups is indicated with a dashed line and an arrow. The diluter for the nuclei after the tube furnace and the ion trap before the LaMer generator are omitted for clarity.
FIG. 3 Schematic diagram of the LaMer-type condensational generator used to produce bigger particles.
FIG. 4 Measured particle concentration as a function of the DMA TF midpoint mobility (DMA response), from the new setup. The mean particle diameter is approximately 1300 nm. (dg = 1260 nm, σ g = 1.25, N total= 6E5 1/cm3, N charged= 6.5E4 1/cm3, Φaerosol= 0.3 l/min, Φsheath= 8.6 l/min, T DOP= 180°C.)
FIG. 5 Model of the DMA response of SA particles describing the conventional method for producing aerosol. The differently charged fractions that make up the sum are also shown.
FIG. 6 Measured DMA responses of SA particles from the conventional and the new setup and the model function for the conventional setup.
FIG. 7 Particle concentrations as a function of the DMA TF peak mobility from the new setup. The mobility diameter corresponding to the distribution peak is approximately 110 nm. (dg = 106 nm, σ g = 1.4, N total= 5.5E6 1/cm3, N charged= 6E5 1/cm3, Φaerosol= 1.5 l/min, Φsheath= 8.3 l/min, T DOP= 105°C.)
FIG. 8 Particle concentrations as a function of the DMA TF peak mobility from the new setup. The mobility diameter corresponding to the distribution peak is approximately 2400 nm. (dg = 2420 nm, σ g = 1.14, N total= 2.3E5 1/cm3, N charged= 2.5E4 1/cm3, Φaerosol= 1.5 l/min, Φsheath= 5 l/min, T DOP= 225°C.)
