Communication: Influence of nanophase segregation on ion transport in room temperature ionic liquids

Griffin, Philip J.; Wang, Yangyang; Holt, Adam P.; Sokolov, Alexei P.

doi:10.1063/1.4947552

Title: Communication: Influence of nanophase segregation on ion transport in room temperature ionic liquids

Journal Article · Thu Apr 21 00:00:00 EDT 2016 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4947552· OSTI ID:1347336

Griffin, Philip J. ^[1]; Wang, Yangyang ^[2]; Holt, Adam P. ^[3]; Sokolov, Alexei P. ^[4]

Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Material Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry

In this paper, we report measurements of the ionic conductivity, shear viscosity, and structural dynamics in a homologous series of quaternary ammonium ionic liquids (ILs) and a prototypical imidazolium-based IL over a wide range of temperatures down to the glass transition. We find that the ionic conductivity of these materials generally decreases, while the shear viscosity correspondingly increases, with increasing volume fraction of aliphatic side groups. Upon crossing an aliphatic volume fraction of ~0.40, we observe a sharp, order-of-magnitude decrease in ionic conductivity and enhancement of viscosity, which coincides with the presence of long-lived, nanometer-sized alkyl aggregates. These strong changes in dynamics are not mirrored in the ionicity of these ILs, which decreases nearly linearly with aliphatic volume fraction. Finally, our results demonstrate that nanophase segregation in neat ILs strongly reduces ionic conductivity primarily due to an aggregation-induced suppression of dynamics.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Pennsylvania, Philadelphia, PA (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; CHE-1213444

OSTI ID:: 1347336

Journal Information:: Journal of Chemical Physics, Vol. 144, Issue 15; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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