A Differential Mobility Analyzer (DMA) for Size Selection of Nanoparticles at High Flow Rates

Figures & data

FIG. 1 Layout of the HF-DMA.

FIG. 2 Transfer function of the Nano-DMA and of the HF-DMA for particles of 5 nm according to Stolzenburg (1988).

FIG. 3 Resolution of the Nano-DMA and of the HF-DMA vs. particle size according to Stolzenburg (1988).

FIG. 4 Set-up to measure the transfer function of the HF-DMA.

FIG. 5 Mobility spectrum of THA ions measured with the HF-DMA operating at the indicated aerosol q and sheath Q flow rates.

FIG. 6 Facility for the production of monodisperse nanoparticles with the HF-DMA.

FIG. 7 Particle size distribution of polydisperse aerosols of tin oxide measured by the SMPS (TSI 3080) at the entrance to the HF-DMA with the furnace operating at the indicated temperatures T _f and flow rates q. The total particle number concentration N, the geometric mean diameter d _g , and the geometric standard deviation σ _g are given by the SMPS.

FIG. 8 Transfer function of the HF-DMA for the THA monomer ion measured experimentally at the indicated ion q and sheath Q flow rates.

FIG. 9 Resolution of HF-DMA for THA ions vs. sheath flow rate. Experimental results and theoretical predictions (Stolzenburg 1988).

FIG. 10 Particle size distributions of tin oxide aerosols measured with the SMPS (TSI 3080) at the outlet of the HF-DMA, when operating at the indicated aerosol q and sheath Q flow rates. The values of the geometric standard deviation σ _g are given by the SMPS.

FIG. 11 Particle number concentration N of tin oxide aerosols measured with the UCPC (TSI 3025) at the outlet of the HF-DMA, when operating at the indicated aerosol q and sheath Q flow rates.

FIG. 12 Geometric standard deviation σ _g of tin oxide aerosols measured with the SMPS (TSI 3080) at the outlet of the HF-DMA, when operating at the indicated aerosol q and sheath Q flow rates.

FIG. 13 Normalized particle size distributions of tin oxide aerosols measured with the SMPS (TSI 3080) at the outlet of the HF-DMA, when operating at the indicated aerosol q and sheath Q flow rates. A geometric standard deviation σ _g of almost 1.05 was measured with the SMPS for all particle sizes in the two series of experiments.

Stolzenburg , M. R. 1988 . An Ultrafine Aerosol Size Distribution Measuring System. PhD thesis , MN, , USA : Department of Mechanical Engineering, University of Minnesota .

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