Increasing Cation Ion Symmetry Reduces Ionic Liquid Ordering in Thin Films

Michael Blake Van Den Top; Andrew Horvath; Spyridon Koutsoukos; Frederik Philippi; Daniel Rauber; Tom Welton; Scott K. Shaw

doi:10.1021/acs.jpcb.4c04413

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Increasing Cation Ion Symmetry Reduces Ionic Liquid Ordering in Thin Films

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Increasing Cation Ion Symmetry Reduces Ionic Liquid Ordering in Thin Films

Michael Blake Van Den Top, Andrew Horvath, Spyridon Koutsoukos, Frederik Philippi, Daniel Rauber, Tom Welton and Scott K. Shaw

The journal of physical chemistry. B, Vol.128(45), pp.11251-11257

11/05/2024

DOI: 10.1021/acs.jpcb.4c04413

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Abstract

Ionic liquids have been shown to form extended ordered structures near surfaces and in bulk. Identifying fundamental driving force(s) for this organization has been elusive. In this paper, we test a hypothesis that the ionic liquid asymmetry, inherent in many of the IL formulations to frustrate crystallization, is a significant contributor to the observed ordering. We have carried out measurements to track the ordering of ionic liquids composed of “spherical” cations, namely, tetraoctylphosphonium ([P8888]) and tetra(propoxymethyl)phosphonium [P(3O1)4] paired with tetracyanoborate anion [B(CN)4]. Analysis of the infrared signatures for films of these ionic liquids shows very little evidence of ordered structures. These liquids instead remain in a more isotropic environment even when confined to volumes of few micrometer dimensions.

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Details

Title: Subtitle: Increasing Cation Ion Symmetry Reduces Ionic Liquid Ordering in Thin Films
Creators: Michael Blake Van Den Top - University of Iowa
Andrew Horvath - University of Iowa
Spyridon Koutsoukos - Imperial College London
Frederik Philippi - Imperial College London
Daniel Rauber - Saarland University
Tom Welton - Imperial College London
Scott K. Shaw - University of Iowa
Resource Type: Journal article
Publication Details: The journal of physical chemistry. B, Vol.128(45), pp.11251-11257
Publisher: American Chemical Society; WASHINGTON
DOI: 10.1021/acs.jpcb.4c04413
ISSN: 1520-6106
eISSN: 1520-5207
Grant note: National Science Foundation: 1651381 National Science Foundation
We acknowledge excellent service and craftsmanship from the electronics, glass, and machining shops at the University of Iowa, without that this work would not have been possible. Funding for this research was provided by the National Science Foundation via award no. 1651381
Language: English
Date published: 11/05/2024
Academic Unit: Chemistry
Record Identifier: 9984742655602771

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