University of Oulu

Lin, J. J., Raj R, K., Wang, S., Kokkonen, E., Mikkelä, M.-H., Urpelainen, S., and Prisle, N. L.: Pre-deliquescent water uptake in deposited nanoparticles observed with in situ ambient pressure X-ray photoelectron spectroscopy, Atmos. Chem. Phys., 21, 4709–4727, https://doi.org/10.5194/acp-21-4709-2021, 2021.

Pre-deliquescent water uptake in deposited nanoparticles observed with in situ ambient pressure X-ray photoelectron spectroscopy

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Author: Lin, Jack J.1; Raj R, Kamal1,2; Wang, Stella3;
Organizations: 1Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
2Center for Atmospheric Research, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland
3Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California, 91125, USA
4MAX IV Laboratory, Lund University, Box 118, 22100 Lund, Sweden
51Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202103308827
Language: English
Published: Copernicus Publications, 2021
Publish Date: 2021-03-30
Description:

Abstract

We study the adsorption of water onto deposited inorganic sodium chloride and organic malonic acid and sucrose nanoparticles at ambient water pressures corresponding to relative humidities (RH) from 0 % to 16 %. To obtain information about water adsorption at conditions which are not accessible with typical aerosol instrumentation, we use surface-sensitive ambient pressure X-ray photoelectron spectroscopy (APXPS), which has a detection sensitivity starting at parts per thousand. Our results show that water is already adsorbed on sodium chloride particles at RH well below deliquescence and that the chemical environment on the particle surface is changing with increasing humidity. While the sucrose particles exhibit only very modest changes on the surface at these relative humidities, the chemical composition and environment of malonic acid particle surfaces is clearly affected. Our observations indicate that water uptake by inorganic and organic aerosol particles could already have an impact on atmospheric chemistry at low relative humidities. We also establish the APXPS technique as a viable tool for studying chemical changes on the surfaces of atmospherically relevant aerosol particles which are not detected with typical online mass- and volume-based methods.

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Series: Atmospheric chemistry and physics
ISSN: 1680-7316
ISSN-E: 1680-7324
ISSN-L: 1680-7316
Volume: 21
Pages: 4709 - 4727
DOI: 10.5194/acp-21-4709-2021
OADOI: https://oadoi.org/10.5194/acp-21-4709-2021
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
1172 Environmental sciences
Subjects:
Funding: This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program, project SURFACE (grant agreement no. 717022). The authors also gratefully acknowledge the financial contribution from the Academy of Finland, including grant nos. 308238, 314175, 335649, 290145, 326291 and 331532. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research Council under contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under contract 2018-04969 and Formas under contract 2019-02496.
EU Grant Number: (717022) SURFACE - The unexplored world of aerosol surfaces and their impacts.
Academy of Finland Grant Number: 308238
314175
290145
335649
326291
331532
Detailed Information: 308238 (Academy of Finland Funding decision)
314175 (Academy of Finland Funding decision)
290145 (Academy of Finland Funding decision)
335649 (Academy of Finland Funding decision)
326291 (Academy of Finland Funding decision)
331532 (Academy of Finland Funding decision)
Dataset Reference: Data for the XPS spectra are available at https://doi.org/10.5281/zenodo.4624072 (Prisle, 2021).
  https://doi.org/10.5281/zenodo.4624072
Copyright information: © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
  https://creativecommons.org/licenses/by/4.0/