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Mesoscale ordering in binary aqueous solvents induced by ion size asymmetry

Witala, Monika; Lages, Sebastian LU and Nygård, Kim (2016) In Soft Matter 12(21). p.4778-4782
Abstract

Surprising weak assembly behavior has lately been found in binary aqueous solvents containing antagonistic salt. The underlying mechanism is still under debate, particularly the role of ion size asymmetry. Here we use small-angle X-ray scattering to study the effect of ion size asymmetry on the mesoscale ordering in a binary solvent composed of water and 2,6-dimethylpyridine with added symmetrical quaternary ammonium salt. By systematically elongating the hydrocarbon side-chain lengths, and hence developing cation-to-anion size asymmetry, we provide the first experimental evidence of a gradual build-up of the solvent's mesoscale ordering. These results are in qualitative agreement with model-independent theoretical predictions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
12
issue
21
pages
5 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:84971601998
  • wos:000379676800011
ISSN
1744-683X
DOI
10.1039/c6sm00580b
language
English
LU publication?
yes
id
54aaae95-68a4-48f3-8b6d-774cacad7b3b
date added to LUP
2017-02-22 13:46:38
date last changed
2017-10-29 04:58:27
@article{54aaae95-68a4-48f3-8b6d-774cacad7b3b,
  abstract     = {<p>Surprising weak assembly behavior has lately been found in binary aqueous solvents containing antagonistic salt. The underlying mechanism is still under debate, particularly the role of ion size asymmetry. Here we use small-angle X-ray scattering to study the effect of ion size asymmetry on the mesoscale ordering in a binary solvent composed of water and 2,6-dimethylpyridine with added symmetrical quaternary ammonium salt. By systematically elongating the hydrocarbon side-chain lengths, and hence developing cation-to-anion size asymmetry, we provide the first experimental evidence of a gradual build-up of the solvent's mesoscale ordering. These results are in qualitative agreement with model-independent theoretical predictions.</p>},
  author       = {Witala, Monika and Lages, Sebastian and Nygård, Kim},
  issn         = {1744-683X},
  language     = {eng},
  number       = {21},
  pages        = {4778--4782},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Mesoscale ordering in binary aqueous solvents induced by ion size asymmetry},
  url          = {http://dx.doi.org/10.1039/c6sm00580b},
  volume       = {12},
  year         = {2016},
}