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. Measuring particle size distributions precisely is an important concern in addressing environmental and human health-related issues. To measureparticle size distributions, a scanning mobility particle sizer (SMPS) is often used. However, it is difficult to analyze particle sizedistributions under fast-changing concentration conditions because the SMPS cannot respond fast enough to reflect current conditions due to thetime necessary for voltage scanning. In this research, we developed a new nanoparticle sizer (NPS), which consists of a multi-port differentialmobility analyzer (MP-DMA) with 12 sampling ports and multi-condensation particle counters (M-CPCs) that simultaneously measure concentrations ofparticles classified by the sampling ports. The M-CPC can completely condense particles larger than 10  nm , and the total particle concentrationsmeasured by each CPC in the M-CPCs and an electrometer were in agreement up to 20 000  no . cm - 3 . We conducted sizedistribution measurements under steady-state conditions using an aerosol generator and under unsteady conditions by switching the aerosol supplyon or off. The data obtained by the NPS corresponded closely to the SMPS measurement data for the steady-state particle concentration case. Inaddition, the NPS could successfully capture the changes in particle size distribution under fast-changing particle concentrationconditions. Finally, we present NPS measurement results of size distributions in a common situation (cooking) as an exemplary real-world application.

Development of a new nanoparticle sizer equipped with a 12-channel multi-port differential mobility analyzer and multi-condensation particle counters