5 years ago

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

Dynamic-Mechanical and Dielectric Evidence of Long-Lived Mesoscale Organization in Ionic Liquids
Yangyang Wang, Tyler Cosby, Joshua Sangoro, Zachariah Vicars
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.

Publisher URL: http://dx.doi.org/10.1021/acs.jpclett.7b01516

DOI: 10.1021/acs.jpclett.7b01516

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