The influence of concentration on the molecular surface structure of simple and mixed aqueous electrolytes
Ottosson, Niklas ; Heyda, Jan ; Wernersson, Erik ; Pokapanich, Wandared ; Svensson, Svante ; Winter, Bernd ; Öhrwall, Gunnar LU
; Jungwirth, Pavel
and Bjorneholm, Olle
(2010)
In Physical Chemistry Chemical Physics
12(36).
p.10693-10700
- Abstract
- We investigate various mechanisms contributing to the surface ion distributions in simple and mixed aqueous alkali-halide solutions depending on the total salt concentration, using a combination of photoelectron spectroscopy and molecular dynamics simulations. In simple solutions, the surface enhancement of large polarizable anions is reduced with increasing concentration. In the case of a NaBr/NaCl mixed aqueous solution, with bromide as the minority component, the situation is more complex. While the total anion/cation charge separation is similarly reduced with increasing salt content, this alone does not uniquely determine the ion distribution due to the co-existence of two different anions, Br- and Cl-. We show that bromide is... (More)
- We investigate various mechanisms contributing to the surface ion distributions in simple and mixed aqueous alkali-halide solutions depending on the total salt concentration, using a combination of photoelectron spectroscopy and molecular dynamics simulations. In simple solutions, the surface enhancement of large polarizable anions is reduced with increasing concentration. In the case of a NaBr/NaCl mixed aqueous solution, with bromide as the minority component, the situation is more complex. While the total anion/cation charge separation is similarly reduced with increasing salt content, this alone does not uniquely determine the ion distribution due to the co-existence of two different anions, Br- and Cl-. We show that bromide is selectively surface enhanced at higher concentrations, despite the fact that the total anion surface enhancement is reduced. This phenomenon, which can be viewed as "salting out'' of bromide by NaCl might have consequences for our understanding of the surface structure of mixed aqueous solutions subjected to concentration increase due to dehydration, such as seawater-born aerosols. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1697317
- author
- Ottosson, Niklas
; Heyda, Jan
; Wernersson, Erik
; Pokapanich, Wandared
; Svensson, Svante
; Winter, Bernd
; Öhrwall, Gunnar
LU
; Jungwirth, Pavel
and Bjorneholm, Olle
- organization
- publishing date
- 2010
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Chemistry Chemical Physics
- volume
- 12
- issue
- 36
- pages
- 10693 - 10700
- publisher
- Royal Society of Chemistry
- external identifiers
-
- wos:000281613300005
- scopus:77956329851
- pmid:20617257
- ISSN
- 1463-9084
- DOI
- 10.1039/c0cp00365d
- language
- English
- LU publication?
- yes
- id
- 1c7883c1-71a8-4a12-875e-f346f8dfe94e (old id 1697317)
- date added to LUP
- 2016-04-01 13:05:10
- date last changed
- 2022-01-27 17:12:11
@article{1c7883c1-71a8-4a12-875e-f346f8dfe94e,
abstract = {{We investigate various mechanisms contributing to the surface ion distributions in simple and mixed aqueous alkali-halide solutions depending on the total salt concentration, using a combination of photoelectron spectroscopy and molecular dynamics simulations. In simple solutions, the surface enhancement of large polarizable anions is reduced with increasing concentration. In the case of a NaBr/NaCl mixed aqueous solution, with bromide as the minority component, the situation is more complex. While the total anion/cation charge separation is similarly reduced with increasing salt content, this alone does not uniquely determine the ion distribution due to the co-existence of two different anions, Br- and Cl-. We show that bromide is selectively surface enhanced at higher concentrations, despite the fact that the total anion surface enhancement is reduced. This phenomenon, which can be viewed as "salting out'' of bromide by NaCl might have consequences for our understanding of the surface structure of mixed aqueous solutions subjected to concentration increase due to dehydration, such as seawater-born aerosols.}},
author = {{Ottosson, Niklas and Heyda, Jan and Wernersson, Erik and Pokapanich, Wandared and Svensson, Svante and Winter, Bernd and Öhrwall, Gunnar and Jungwirth, Pavel and Bjorneholm, Olle}},
issn = {{1463-9084}},
language = {{eng}},
number = {{36}},
pages = {{10693--10700}},
publisher = {{Royal Society of Chemistry}},
series = {{Physical Chemistry Chemical Physics}},
title = {{The influence of concentration on the molecular surface structure of simple and mixed aqueous electrolytes}},
url = {{http://dx.doi.org/10.1039/c0cp00365d}},
doi = {{10.1039/c0cp00365d}},
volume = {{12}},
year = {{2010}},
}