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Title: Operation of the Airmodus A11 nano Condensation Nucleus Counter at various inlet pressures and various operation temperatures, and design of a new inlet system

Abstract

Measuring sub-3 nm particles outside of controlled laboratory conditions is a challenging task, as many of the instruments are operated at their limits and are subject to changing ambient conditions. In this study, we advance the current understanding of the operation of the Airmodus A11 nano Condensation Nucleus Counter (nCNC), which consists of an A10 Particle Size Magnifier (PSM) and an A20 Condensation Particle Counter (CPC). The effect of the inlet line pressure on the measured particle concentration was measured, and two separate regions inside the A10, where supersaturation of working fluid can take place, were identified. The possibility of varying the lower cut-off diameter of the nCNC was investigated; by scanning the growth tube temperature, the range of the lower cut-off was extended from 1–2.5 to 1–6 nm. Here we present a new inlet system, which allows automated measurement of the background concentration of homogeneously nucleated droplets, minimizes the diffusion losses in the sampling line and is equipped with an electrostatic filter to remove ions smaller than approximately 4.5 nm. Lastly, our view of the guidelines for the optimal use of the Airmodus nCNC is provided.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4];  [1];  [1]
  1. Univ. of Helsinki, Helsinki (Finland)
  2. Univ. of Helsinki, Helsinki (Finland); Univ. Paris-Diderot, Paris (France)
  3. Univ. of Helsinki, Helsinki (Finland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  4. Airmodus Ltd., Helsinki (Finland)
Publication Date:
Research Org.:
Univ. of Helsinki, Helsinki (Finland). Dept. of Physics
Sponsoring Org.:
USDOE
OSTI Identifier:
1375412
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Volume: 9; Journal Issue: 7; Journal ID: ISSN 1867-8548
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Kangasluoma, Juha, Franchin, Alessandro, Duplissy, Jonahtan, Ahonen, Lauri, Korhonen, Frans, Attoui, Michel, Mikkila, Jyri, Lehtipalo, Katrianne, Vanhanen, Joonas, Kulmala, Markku, and Petaja, Tuukka. Operation of the Airmodus A11 nano Condensation Nucleus Counter at various inlet pressures and various operation temperatures, and design of a new inlet system. United States: N. p., 2016. Web. doi:10.5194/amt-9-2977-2016.
Kangasluoma, Juha, Franchin, Alessandro, Duplissy, Jonahtan, Ahonen, Lauri, Korhonen, Frans, Attoui, Michel, Mikkila, Jyri, Lehtipalo, Katrianne, Vanhanen, Joonas, Kulmala, Markku, & Petaja, Tuukka. Operation of the Airmodus A11 nano Condensation Nucleus Counter at various inlet pressures and various operation temperatures, and design of a new inlet system. United States. doi:10.5194/amt-9-2977-2016.
Kangasluoma, Juha, Franchin, Alessandro, Duplissy, Jonahtan, Ahonen, Lauri, Korhonen, Frans, Attoui, Michel, Mikkila, Jyri, Lehtipalo, Katrianne, Vanhanen, Joonas, Kulmala, Markku, and Petaja, Tuukka. Thu . "Operation of the Airmodus A11 nano Condensation Nucleus Counter at various inlet pressures and various operation temperatures, and design of a new inlet system". United States. doi:10.5194/amt-9-2977-2016. https://www.osti.gov/servlets/purl/1375412.
@article{osti_1375412,
title = {Operation of the Airmodus A11 nano Condensation Nucleus Counter at various inlet pressures and various operation temperatures, and design of a new inlet system},
author = {Kangasluoma, Juha and Franchin, Alessandro and Duplissy, Jonahtan and Ahonen, Lauri and Korhonen, Frans and Attoui, Michel and Mikkila, Jyri and Lehtipalo, Katrianne and Vanhanen, Joonas and Kulmala, Markku and Petaja, Tuukka},
abstractNote = {Measuring sub-3 nm particles outside of controlled laboratory conditions is a challenging task, as many of the instruments are operated at their limits and are subject to changing ambient conditions. In this study, we advance the current understanding of the operation of the Airmodus A11 nano Condensation Nucleus Counter (nCNC), which consists of an A10 Particle Size Magnifier (PSM) and an A20 Condensation Particle Counter (CPC). The effect of the inlet line pressure on the measured particle concentration was measured, and two separate regions inside the A10, where supersaturation of working fluid can take place, were identified. The possibility of varying the lower cut-off diameter of the nCNC was investigated; by scanning the growth tube temperature, the range of the lower cut-off was extended from 1–2.5 to 1–6 nm. Here we present a new inlet system, which allows automated measurement of the background concentration of homogeneously nucleated droplets, minimizes the diffusion losses in the sampling line and is equipped with an electrostatic filter to remove ions smaller than approximately 4.5 nm. Lastly, our view of the guidelines for the optimal use of the Airmodus nCNC is provided.},
doi = {10.5194/amt-9-2977-2016},
journal = {Atmospheric Measurement Techniques (Online)},
issn = {1867-8548},
number = 7,
volume = 9,
place = {United States},
year = {2016},
month = {7}
}

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