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

被引:16
|
作者
Griffin, Philip J. [1 ]
Wang, Yangyang [2 ]
Holt, Adam P. [3 ]
Sokolov, Alexei P. [4 ,5 ]
机构
[1] Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St, Philadelphia, PA 19104 USA
[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[4] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA
[5] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA
来源
JOURNAL OF CHEMICAL PHYSICS | 2016年 / 144卷 / 15期
关键词
ORIENTATIONAL DYNAMICS; NANOSTRUCTURE; AGGREGATION; RELAXATION;
D O I
10.1063/1.4947552
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 similar to 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. Our results demonstrate that nanophase segregation in neat ILs strongly reduces ionic conductivity primarily due to an aggregation-induced suppression of dynamics. Published by AIP Publishing.
引用
收藏
页数:5
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