Assessment of a Cylindrical and a Rectangular Plate Differential Mobility Analyzer for Size Fractionation of Nanoparticles at High-Aerosol Flow Rates

Figures & data

FIG. 1 The high-flow DMA of rectangular plate electrodes: (a) general layout, (b) sheath flow distributor, and (c) streamlines of the sheath flow within the distributor and the classification zone.

TABLE 1 Parameters of the particle size distribution (SMPS) of the polydisperse aerosol source

I (A)	q (slm)	dg (nm)	σg	N (cm^−3)
0.3	200	14.5	1.53	6.0 × 10^6
	350	13.9	1.55	1.0 × 10^7
	500	9.6	1.48	1.5 × 10^7
0.75	200	66.0	1.57	1.6 × 10^6
	300	37.3	1.56	2.6 × 10^6
	400	25.6	1.64	3.4 × 10^6

FIG. 2 Size distributions of copper particles classified by the cylindrical HF-DMA at the indicated aerosol flow rates q and sheath gas flow rates Q. The geometrical standard deviation σ_g and the minimum and maximum values of the particle number concentration N are shown.

FIG. 3 Size distributions of copper particles classified by the rectangular HF-DMA of rectangular plates at the indicated aerosol flow rates q and sheath gas flow rates Q. The geometrical standard deviation σ_g and the minimum and maximum values of the particle number concentration N are shown.

FIG. 4 Size distributions of copper particles classified by the rectangular plate DMA of rectangular plates at an aerosol flow rate q of 100 lpm and sheath gas flow rates Q of 300 lpm and 400 lpm. The geometrical standard deviation σ_g and the maximum attainable values of the geometric diameter d_g are shown.