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 | |
| 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. The rheology measurements were conducted at the Oak Ridge National Laboratory’s Center for Nanophase Materials Sciences, which is sponsored by the Division of Scientific User Facilities, Office of Basic Energy Sciences, U.S. Department of Energy.
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