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The surface composition of amino acid - halide salt solutions is pH-dependent

Gopakumar, Geethanjali ; Unger, Isaak ; Saak, Clara Magdalena ; Öhrwall, Gunnar LU orcid ; Naves de Brito, Arnaldo ; Rizuti da Rocha, Tulio Costa ; Nicolas, Christophe ; Caleman, Carl and Björneholm, Olle LU (2022) In Environmental Science: Atmospheres 2(3). p.441-448
Abstract

In atmospheric aerosol particles, the chemical surface composition governs both heterogenous chemical reactions with gas-phase species and the ability to act as nuclei for cloud droplets. The pH in aerosol particles is expected to affect these properties, but it is very challenging to measure the pH in individual droplets, precluding the investigation of its influence on the particle's surface composition. In this work, we use photoelectron spectroscopy to explore how the surface composition of aqueous solutions containing inorganic salt and amino acids changes as a function of pH. We observe a change by a factor of 4-5 of the relative distribution of inorganic ions at the surface of a liquid water jet, as a function of solution pH and... (More)

In atmospheric aerosol particles, the chemical surface composition governs both heterogenous chemical reactions with gas-phase species and the ability to act as nuclei for cloud droplets. The pH in aerosol particles is expected to affect these properties, but it is very challenging to measure the pH in individual droplets, precluding the investigation of its influence on the particle's surface composition. In this work, we use photoelectron spectroscopy to explore how the surface composition of aqueous solutions containing inorganic salt and amino acids changes as a function of pH. We observe a change by a factor of 4-5 of the relative distribution of inorganic ions at the surface of a liquid water jet, as a function of solution pH and type of amino acid in the solution. The driving forces for the surface enhancement or depletion are ion pairing and the formation of charged layers close to the aqueous surface.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Science: Atmospheres
volume
2
issue
3
pages
8 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85127631032
ISSN
2634-3606
DOI
10.1039/d1ea00104c
language
English
LU publication?
yes
id
5cd51ec8-7540-417c-a605-417a4bde3e85
date added to LUP
2022-06-29 10:54:24
date last changed
2023-11-21 02:54:45
@article{5cd51ec8-7540-417c-a605-417a4bde3e85,
  abstract     = {{<p>In atmospheric aerosol particles, the chemical surface composition governs both heterogenous chemical reactions with gas-phase species and the ability to act as nuclei for cloud droplets. The pH in aerosol particles is expected to affect these properties, but it is very challenging to measure the pH in individual droplets, precluding the investigation of its influence on the particle's surface composition. In this work, we use photoelectron spectroscopy to explore how the surface composition of aqueous solutions containing inorganic salt and amino acids changes as a function of pH. We observe a change by a factor of 4-5 of the relative distribution of inorganic ions at the surface of a liquid water jet, as a function of solution pH and type of amino acid in the solution. The driving forces for the surface enhancement or depletion are ion pairing and the formation of charged layers close to the aqueous surface.</p>}},
  author       = {{Gopakumar, Geethanjali and Unger, Isaak and Saak, Clara Magdalena and Öhrwall, Gunnar and Naves de Brito, Arnaldo and Rizuti da Rocha, Tulio Costa and Nicolas, Christophe and Caleman, Carl and Björneholm, Olle}},
  issn         = {{2634-3606}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{441--448}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Environmental Science: Atmospheres}},
  title        = {{The surface composition of amino acid - halide salt solutions is pH-dependent}},
  url          = {{http://dx.doi.org/10.1039/d1ea00104c}},
  doi          = {{10.1039/d1ea00104c}},
  volume       = {{2}},
  year         = {{2022}},
}