scholarly journals Tandem Differential Mobility Analyzer/Aerodynamic Particle Sizer (APS) Handbook

2010 ◽  
Author(s):  
D Collins
Keyword(s):  
Differential Mobility Analyzer ◽  
Differential Mobility ◽  
Particle Sizer

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

2019 ◽  
Author(s):  
Hong Ku Lee ◽  
Handol Lee ◽  
Kang-Ho Ahn
Keyword(s):  
Particle Size ◽  
Steady State ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Particle Concentration ◽  
Size Distributions ◽  
Nano Particle ◽  
Differential Mobility Analyzer ◽  
Differential Mobility ◽  
Particle Sizer

Abstract. Measuring particle size distributions precisely is an important concern in addressing environmental and human health-related issues. To measure particle size distribution, a scanning mobility particle sizer (SMPS) is often used. However, it is difficult to analyze particle size distribution 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 Nano-particle 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 nm, and the total particle concentrations measured by each homemade CPC in the M-CPCs and an electrometer were in agreement up to 20,000 # cm−3. For particle classification tests on the MP-DMA, geometric standard deviations of the size distributions of classified particles were estimated in the range of 1.035–1.066. We conducted size distribution measurements under steady-state conditions using an aerosol generator and under unsteady conditions by switching the aerosol supply on/off. The data obtained by the NPS corresponded closely with 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. For the last, we presented the NPS measurement results of size distributions in common situation (cooking) as an exemplary real-world application.

Performance Study of SMPS and FDMA for Nanometer Aerosol Particle Measurements

2011 ◽  
Vol 213 ◽  
pp. 39-42
Author(s):  
Chang Tang Chang ◽  
Chih Ming Ma ◽  
Gui Bing Hong ◽  
Ham Sun Huang ◽  
Da Ren Chen
Keyword(s):  
Differential Mobility Analyzer ◽  
Performance Study ◽  
Differential Mobility ◽  
Particle Measurements ◽  
Dispersed Particles ◽  
Counting Statistics ◽  
Particle Sizer ◽  
Nanometer Particle ◽  
Better Than ◽  
Made In

A new method of Differential Mobility Analyzer (DMA) operation using a Fast Scanning Differential Mobility Analyzer (FDMA) nanometer particle sizer has been implemented. By optimizing the flow and voltage ramps, improvements can be made in the FDMA's measurement size range, counting statistics and resolution. In this study, an electrostatic classifier was used to generate mono-dispersed particles of different sizes to calibrate the delay time of the FDMA. The aerosol from incense combustion could be measured directly by FDMA although the particulate concentration was as high as 1,011 particles cm-3. The resolution of the FDMA was 3 nm and better than the SMPS (10nm).

scholarly journals A novel tandem differential mobility analyzer with organic vapor treatment of aerosol particles

2001 ◽  
Vol 1 (1) ◽  
pp. 51-60 ◽  
Author(s):  
J. Joutsensaari ◽  
P. Vaattovaara ◽  
M. Vesterinen ◽  
K. Hämeri ◽  
A. Laaksonen
Keyword(s):  
Water Vapor ◽  
Sodium Chloride ◽  
Citric Acid ◽  
Ammonium Sulfate ◽  
Adipic Acid ◽  
Aerosol Particles ◽  
Ethanol Vapor ◽  
Differential Mobility Analyzer ◽  
Differential Mobility ◽  
Organic Vapor

Abstract. A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an Organic Tandem Differential Mobility Analyzer (OTDMA). The OTDMA method has been tested for inorganic (sodium chloride and ammonium sulfate) and organic (citric acid and adipic acid) particles. Growth curves of the particles have been measured in ethanol vapor and as a comparison in water vapor as a function of saturation ratio. Measurements in water vapor show that sodium chloride and ammonium sulfate as well as citric acid particles grow at water saturation ratios (S) of 0.8 and above, whereas adipic acid particles do not grow at S <  0.96. For sodium chloride and ammonium sulfate particles, a deliquescence point is observed at S = 0.75 and S = 0.79, respectively. Citric acid particles grow monotonously with increasing saturation ratios already at low saturation ratios and no clear deliquescence point is found. For sodium chloride and ammonium sulfate particles, no growth can be seen in ethanol vapor at saturation ratios below 0.93. In contrast, for adipic acid particles, the deliquescence takes place at around S = 0.95 in the ethanol vapor. The recrystallization of adipic acid takes place at S < 0.4. Citric acid particles grow in ethanol vapor similarly as in water vapor; the particles grow monotonously with increasing saturation ratios and no stepwise deliquescence is observed. The results show that the working principles of the OTDMA are operational for single-component aerosols. Furthermore, the results indicate that the OTDMA method may prove useful in determining whether aerosol particles contain organic substances, especially if the OTDMA is operated in parallel with a hygroscopicity TDMA, as the growth of many substances is different in ethanol and water vapors.

Newly developed instrumentation for measuring highly oxidized molecules at atmospheric pressure

2021 ◽  
Author(s):  
Paap Koemets ◽  
Sander Mirme ◽  
Kuno Kooser ◽  
Heikki Junninen
Keyword(s):  
Gas Phase ◽  
Atmospheric Chemistry ◽  
Atmospheric Pressure ◽  
Chemical Ionization ◽  
Measurement Technology ◽  
Differential Mobility Analyzer ◽  
Neutral Cluster ◽  
Differential Mobility ◽  
Alpha Pinene ◽  
Ambient Measurements

&lt;p&gt;The Highly Oxidized Molecule Ion Spectrometer (HOMIS) is a novel instrument for measuring the total concentration of highly oxidized molecules (HOM-s) (Bianchi et al., 2019) at atmospheric pressure. The device combines a chemical ionization charger with a multi-channel differential mobility analyzer. The chemical ionization charger is based on the principles outlined by Eisele and Tanner (1993). The charger is attached to a parallel differential mobility analyzer identical to the ones used in the Neutral cluster and Air Ion Spectrometer (NAIS, Mirme 2011), but with modified sample and sheath air flow rates to improve the mobility resolution of the device. The complete mobility distribution in the range from 3.2 to 0.056 cm&lt;sup&gt;2&lt;/sup&gt;/V/s is measured simultaneously by 25 electrometers. The range captures the charger ions, monomers, dimers, trimers but also extends far towards larger particles to possibly detect larger HOM-s that have not been measured with existing instrumentation. The maximum time resolution of the device is 1 second allowing it to detect rapid changes in the sample. The device has been designed to be easy to use, require little maintenance and work reliably in various environments during long term measurements.&lt;/p&gt;&lt;p&gt;First results of the prototype were acquired from laboratory experiments and ambient measurements. Experiments were conducted at the Laboratory of Environmental Physics, University of Tartu. The sample was drawn from a reaction chamber where alpha-pinene and ozone were introduced. Initial results show a good response when concentrations of alpha-pinene and ozone were changed.&amp;#160;&lt;/p&gt;&lt;p&gt;Ambient measurements were conducted at the SMEAR Estonia measurement station in a hemiboreal forest for 10 days in the spring and two months in the winter of 2020. The HOMIS measurements were performed together with a CI-APi-TOF (Jokinen et al., 2012).&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;References:&lt;/p&gt;&lt;p&gt;Bianchi, F., Kurt&amp;#233;n, T., Riva, M., Mohr, C., Rissanen, M. P., Roldin, P., Berndt, T., Crounse, J. D., Wennberg, P. O., Mentel, T. F., Wildt, J., Junninen, H., Jokinen, T., Kulmala, M., Worsnop, D. R., Thornton, J. A., Donahue, N., Kjaergaard, H. G. and Ehn, M. (2019), &amp;#8220;Highly Oxygenated Organic Molecules (HOM) from Gas-Phase Autoxidation Involving Peroxy Radicals: A Key Contributor to Atmospheric Aerosol&amp;#8221;, Chemical Reviews, 119, 6, 3472&amp;#8211;3509&lt;/p&gt;&lt;p&gt;Eisele, F. L., Tanner D. J. (1993), &amp;#8220;Measurement of the gas phase concentration of H2SO4 and methane sulfonic acid and estimates of H2SO4 production and loss in the atmosphere&amp;#8221;, JGR: Atmospheres, 98, 9001-9010&lt;/p&gt;&lt;p&gt;Jokinen T., Sipil&amp;#228; M., Junninen H., Ehn M., L&amp;#246;nn G., Hakala J., Pet&amp;#228;j&amp;#228; T., Mauldin III R. L., Kulmala M., and Worsnop D. R. (2012), &amp;#8220;Atmospheric sulphuric acid and neutral cluster measurements using CI-APi-TOF&amp;#8221;, Atmospheric Chemistry and Physics, 12, 4117&amp;#8211;4125&lt;/p&gt;&lt;p&gt;Mirme, S. (2011), &amp;#8220;Development of nanometer aerosol measurement technology&amp;#8221;, Doctoral thesis, University of Tartu&lt;/p&gt;

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