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

Physical Chemistry Chemical Physics : PCCP
Cameron C WeberTom Welton

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 c...Continue Reading

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Citations

May 14, 2020·Physical Chemistry Chemical Physics : PCCP·Dilek YalcinCameron C Weber
Oct 23, 2020·International Journal of Molecular Sciences·Wagner SilvaEurico J Cabrita
Dec 29, 2020·Nanotechnology·Domenic PreteFrancesco Rossella
Mar 19, 2020·The Journal of Physical Chemistry. B·Maria Enrica Di PietroAndrea Mele
Feb 25, 2021·Physical Chemistry Chemical Physics : PCCP·Eduards BakisTom Welton
Jul 13, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Giacomo SaielliAndrea Mele
Aug 14, 2020·The Journal of Physical Chemistry. B·Utkarsh Kapoor, Jindal K Shah
Feb 4, 2022·The Journal of Physical Chemistry. B·Malia B WennyJarad A Mason

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Methods Mentioned

BETA
X-ray
NMR

Software Mentioned

LabVIEW
Origin

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