Development of a new nanoparticle sizer equipped with a 12-channel multi-port differential mobility analyzer and multi-condensation particle counters
<p>Measuring particle size distributions precisely is an important concern in addressing environmental and human health-related issues. To measure particle size distributions, a scanning mobility particle sizer (SMPS) is often used. However, it is difficult to analyze particle size distributio...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-04-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/13/1551/2020/amt-13-1551-2020.pdf |
| Summary: | <p>Measuring particle size distributions precisely is an important concern in addressing environmental and human health-related issues. To measure
particle size distributions, a scanning mobility particle sizer (SMPS) is often used. However, it is difficult to analyze particle size
distributions under fast-changing concentration conditions because the SMPS cannot respond fast enough to reflect current conditions due to the
time necessary for voltage scanning. In this research, we developed a new nanoparticle sizer (NPS), which consists of a multi-port differential
mobility analyzer (MP-DMA) with 12 sampling ports and multi-condensation particle counters (M-CPCs) that simultaneously measure concentrations of
particles classified by the sampling ports. The M-CPC can completely condense particles larger than 10 <span class="inline-formula">nm</span>, and the total particle concentrations
measured by each CPC in the M-CPCs and an electrometer were in agreement up to 20 000 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">no</mi><mo>.</mo><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">cm</mi><mrow><mo>-</mo><mn mathvariant="normal">3</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="43pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="27caf84c105f7533347530fa47df59f2"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="amt-13-1551-2020-ie00001.svg" width="43pt" height="13pt" src="amt-13-1551-2020-ie00001.png"/></svg:svg></span></span>. We conducted size
distribution measurements under steady-state conditions using an aerosol generator and under unsteady conditions by switching the aerosol supply
on or off. The data obtained by the NPS corresponded closely to the SMPS measurement data for the steady-state particle concentration case. In
addition, the NPS could successfully capture the changes in particle size distribution under fast-changing particle concentration
conditions. Finally, we present NPS measurement results of size distributions in a common situation (cooking) as an exemplary real-world application.</p> |
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| ISSN: | 1867-1381 1867-8548 |