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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-110
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-110
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  14 Apr 2020

14 Apr 2020

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This preprint is currently under review for the journal AMT.

Nano-hygroscopicity tandem differential mobility analyzer (nano-HTDMA) for investigating hygroscopic properties of sub-10 nm aerosol nanoparticles

Ting Lei1,2, Nan Ma4,1,3, Juan Hong4,1, Thomas Tuch3, Xin Wang2, Zhibin Wang5, Mira Pöhlker2, Maofa Ge6, Weigang Wang6, Eugene Mikhailov7, Thorsten Hoffmann8, Ulrich Pöschl2, Hang Su2, Alfred Wiedensohler3, and Yafang Cheng1 Ting Lei et al.
  • 1Minerva Research Group,Max Planck Institute for Chemistry, 55128 Mainz, Germany
  • 2Multiphase Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
  • 3Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany
  • 4Institute for Environmental and Climate Research, Jinan University, 511443 Guangzhou, China
  • 5Reserch Center for Air Pollution and Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, 310058, China
  • 6Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
  • 7St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
  • 8Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg University Mainz, Mainz, Germany

Abstract. Interactions between water and nanoparticles are relevant for atmospheric multiphase processes, physical chemistry, and materials science. Current knowledge of the hygroscopic and related physico-chemical properties of nanoparticles, however, is restricted by limitations of the available measurement techniques. Here, we present the design and performance of a nano-hygroscopicity tandem differential mobility analyzer (nano-HTDMA) apparatus that enables high accuracy and precision in hygroscopic growth measurements of aerosol nanoparticles with diameters less than 10 nm. Detailed methods of calibration and validation are provided. Beside maintaining accurate and stable sheath/aerosol flow rates (± 1 %), high accuracy of DMA voltage (± 0.1 %) in the range of ~0–50 V is crucial to achieve accurate sizing and small sizing offsets between the two DMAs (< 1.4 %). To maintain a stable relative humidity (RH), the humidification system and the second DMA are placed in a well-insulated and air conditioner housing (± 0.1 K). We also tested and discussed different ways of preventing pre-deliquescence in the second DMA. Our measurement results for ammonium sulfate nanoparticles are in good agreement with Biskos et al. (2006b), with no significant size-effect on the deliquescence and efflorescence relative humidity (DRH, ERH) at diameters down to 6 nm. For sodium sulfate nanoparticles, however, we find a pronounced size-dependence of DRH and ERH between 20 and 6 nm nanoparticles.

Ting Lei et al.

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Short summary
We present a newly designed and self-assembled nano-hygroscopicity tandem differential mobility analyzer (nano-HTDMA) apparatus that enables high accuracy and precision in hygroscopic growth measurements of aerosol nanoparticles with diameters less than 10 nm. We further introduce the comprehensive methods for system calibration and performance of the system.
We present a newly designed and self-assembled nano-hygroscopicity tandem differential mobility...
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