On the structural origin of free volume in 1-alkyl-3-methylimidazolium ionic liquid mixtures: a SAXS and 129Xe NMR study.

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Title: On the structural origin of free volume in 1-alkyl-3-methylimidazolium ionic liquid mixtures: a SAXS and 129Xe NMR study.
Authors: Weber, CC
Brooks, NJ
Castiglione, F
Mauri, M
Simonutti, R
Mele, A
Welton, T
Item Type: Journal Article
Abstract: Ionic liquid (IL) mixtures enable the design of fluids with finely tuned structural and physicochemical properties for myriad applications. In order to rationally develop and design IL mixtures with the desired properties, a thorough understanding of the structural origins of their physicochemical properties and the thermodynamics of mixing needs to be developed. To elucidate the structural origins of the excess molar volume within IL mixtures containing ions with different alkyl chain lengths, 3 IL mixtures containing 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ILs have been explored in a joint small angle X-ray scattering (SAXS) and 129Xe NMR study. The apolar domains of the IL mixtures were shown to possess similar dimensions to the largest alkyl chain of the mixture with the size evolution determined by whether the shorter alkyl chain was able to interact with the apolar domain. 129Xe NMR results illustrated that the origin of excess molar volume in these mixtures was due to fluctuations within these apolar domains arising from alkyl chain mismatch, with the formation of a greater number of smaller voids within the IL structure. These results indicate that free volume effects for these types of mixtures can be predicted from simple considerations of IL structure and that the structural basis for the formation of excess molar volume in these mixtures is substantially different to IL mixtures formed of different types of ions.
Issue Date: 21-Mar-2019
Date of Acceptance: 20-Feb-2019
ISSN: 1463-9076
Publisher: Royal Society of Chemistry
Start Page: 5999
End Page: 6010
Journal / Book Title: Physical Chemistry Chemical Physics
Volume: 21
Issue: 11
Copyright Statement: © 2019, the Owner Societies.
Keywords: 02 Physical Sciences
03 Chemical Sciences
Chemical Physics
Publication Status: Published
Conference Place: England
Embargo Date: 2020-02-20
Online Publication Date: 2019-02-20
Appears in Collections:Chemistry
Biological and Biophysical Chemistry
Catalysis and Advanced Materials

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