Dynamic-Mechanical and Dielectric Evidence of Long-Lived Mesoscale Organization in Ionic Liquids

Tyler Cosby; Zachariah Vicars; Yangyang Wang; Joshua Sangoro

doi:10.1021/acs.jpclett.7b01516

Dynamic-Mechanical and Dielectric Evidence of Long-Lived Mesoscale Organization in Ionic Liquids

Tyler Cosby, Zachariah Vicars, Yangyang Wang, Joshua Sangoro

Macromolecular Nanomaterials

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

Experimental evidence of the dynamics of mesoscopic structure in room-temperature ionic liquids - a feature expected to correlate with many physicochemical properties of these materials - remains limited. Here, we report the observation of slow, sub-α relaxations corresponding to dynamics of nanoscale hydrophobic aggregates in a systematic series of 1-alkyl-3-methylimidazolium-based ionic liquids from detailed analysis of dynamic-mechanical and broad-band dielectric spectra. The emergence of the sub-α relaxations correlates with increases in the zero-shear viscosity and static dielectric permittivity, constituting direct evidence of the influence of mesoscale aggregation on the physicochemical properties of ionic liquids.

Original language	English
Pages (from-to)	3544-3548
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	8
Issue number	15
DOIs	https://doi.org/10.1021/acs.jpclett.7b01516
State	Published - Aug 3 2017

Funding

Z.V. and J.S. acknowledge support by the National Science Foundation, Division of Materials Research Polymers Program through DMR-1508394. T.C. gratefully acknowledges financial support of the U.S. Army Research Office under Contract No. W911NF-17-1-0052.

Funders	Funder number
National Science Foundation	1508394, DMR-1508394
Army Research Office	W911NF-17-1-0052

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abstract = "Experimental evidence of the dynamics of mesoscopic structure in room-temperature ionic liquids - a feature expected to correlate with many physicochemical properties of these materials - remains limited. Here, we report the observation of slow, sub-α relaxations corresponding to dynamics of nanoscale hydrophobic aggregates in a systematic series of 1-alkyl-3-methylimidazolium-based ionic liquids from detailed analysis of dynamic-mechanical and broad-band dielectric spectra. The emergence of the sub-α relaxations correlates with increases in the zero-shear viscosity and static dielectric permittivity, constituting direct evidence of the influence of mesoscale aggregation on the physicochemical properties of ionic liquids.",

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AU - Vicars, Zachariah

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AU - Sangoro, Joshua

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AB - Experimental evidence of the dynamics of mesoscopic structure in room-temperature ionic liquids - a feature expected to correlate with many physicochemical properties of these materials - remains limited. Here, we report the observation of slow, sub-α relaxations corresponding to dynamics of nanoscale hydrophobic aggregates in a systematic series of 1-alkyl-3-methylimidazolium-based ionic liquids from detailed analysis of dynamic-mechanical and broad-band dielectric spectra. The emergence of the sub-α relaxations correlates with increases in the zero-shear viscosity and static dielectric permittivity, constituting direct evidence of the influence of mesoscale aggregation on the physicochemical properties of ionic liquids.

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Dynamic-Mechanical and Dielectric Evidence of Long-Lived Mesoscale Organization in Ionic Liquids

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