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- W2019907209 abstract "Abstract We designed and constructed a corona-discharge-based unipolar mini-charger and experimentally evaluated its performance. The simple design and compact size make the prototype mini-charger well suited for use with portable aerosol sizing instruments based on particle electrical mobility techniques. In this work, we optimized the extrinsic charging efficiency of the prototype mini-charger for two different aerosol flow rates (i.e., 0.3 and 1.5 lpm). The optimal settings for the prototype operation are: (i) a corona current of 1 μ A and an ion driving voltage of 40 V for the 0.3 lpm flow rate, and (ii) 2 μ A and 120 V for the 1.5 lpm flowrate. Both intrinsic and extrinsic charging efficiencies of the prototype mini-charger at the optimal operational conditions were then evaluated for particles in diameters ranging from 10 to 200 nm. The intrinsic charging efficiency of the prototype reaches 100% at 20 nm for the 0.3 lpm flow rate, and 45 nm for the 1.5 lpm flow rate. The higher intrinsic charging efficiency at the low flowrate is due to the longer residence time of particles in the device. The extrinsic charging efficiency, however, is higher for the 1.5 lpm flow rate than for the 0.3 lpm flow rate due to charged particle loss in the prototype. Charge distributions of test monodisperse particles of different sizes were also measured by the Tandem-DMA technique." @default.
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- W2019907209 date "2008-05-01" @default.
- W2019907209 modified "2023-09-24" @default.
- W2019907209 title "Performance study of a unipolar aerosol mini-charger for a personal nanoparticle sizer" @default.
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- W2019907209 doi "https://doi.org/10.1016/j.jaerosci.2008.01.003" @default.
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