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

Lin, Jack J. ; Raj R, Kamal ; Wang, Stella ; Kokkonen, Esko LU orcid ; Mikkelä, Mikko Heikki LU ; Urpelainen, Samuli LU and Prisle, Nønne L. (2021) In Atmospheric Chemistry and Physics 21(6). p.4709-4727
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... (More)

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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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
21
issue
6
pages
19 pages
publisher
Copernicus GmbH
external identifiers
  • scopus:85103282722
ISSN
1680-7316
DOI
10.5194/acp-21-4709-2021
language
English
LU publication?
yes
id
f25fc482-3907-48ca-a689-56204092aaad
date added to LUP
2021-04-07 12:47:49
date last changed
2022-04-27 01:20:16
@article{f25fc482-3907-48ca-a689-56204092aaad,
  abstract     = {{<p>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. </p>}},
  author       = {{Lin, Jack J. and Raj R, Kamal and Wang, Stella and Kokkonen, Esko and Mikkelä, Mikko Heikki and Urpelainen, Samuli and Prisle, Nønne L.}},
  issn         = {{1680-7316}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{4709--4727}},
  publisher    = {{Copernicus GmbH}},
  series       = {{Atmospheric Chemistry and Physics}},
  title        = {{Pre-deliquescent water uptake in deposited nanoparticles observed with in situ ambient pressure X-ray photoelectron spectroscopy}},
  url          = {{http://dx.doi.org/10.5194/acp-21-4709-2021}},
  doi          = {{10.5194/acp-21-4709-2021}},
  volume       = {{21}},
  year         = {{2021}},
}