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The Surface Composi...
The Surface Composition of Amino Acid - Halide Salt Solutions is pH-Dependent
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- Gopakumar, Geethanjali, 1992- (författare)
- Uppsala universitet,Kemisk och biomolekylär fysik
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- Unger, Isaak (författare)
- Uppsala universitet,Kemisk och biomolekylär fysik
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- Saak, Clara-Magdalena (författare)
- Uppsala universitet,Kemisk och biomolekylär fysik
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- Öhrwall, Gunnar (författare)
- MAX IV Laboratory, Lund University, PO Box 118, SE-22100 Lund, Sweden
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- Naves de Brito, Arnaldo (författare)
- University of Campinas, Campinas, SP, Brazil
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- Costa Rizuti da Rocha, Tulio (författare)
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Sao Paulo, Brazil
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- Nicolas, Christophe (författare)
- Synchrotron SOLEIL, Gif-sur-Yvette, France
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- Caleman, Carl (författare)
- Uppsala universitet,Kemisk och biomolekylär fysik,Center for Free-Electron Laser Science, DESY, Notkestrasse 85, DE-22607 Hamburg, Germany
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- Björneholm, Olle (författare)
- Uppsala universitet,Kemisk och biomolekylär fysik
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(creator_code:org_t)
- 2022
- 2022
- Engelska.
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Ingår i: Environmental Science: Atmospheres. ; :3
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In atmospheric aerosol particles, the chemical surface composition governs both heterogeneous chemical reactions with gas-phase species and the ability to act as nuclei for cloud droplets. The pH in aerosol droplets 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. Our findings apply to any aqueous interface at which organic species with charged functional groups are present.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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