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

被引：35

作者：

Cosby, Tyler ^{[1
]}

Vicars, Zachariah ^{[1
]}

Wang, Yangyang ^{[2
]}

Sangoro, Joshua ^{[1
]}

机构：

[1] Univ Tennessee, Dept Chem & Biomol Engn, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 15期

基金：

美国国家科学基金会;

关键词：

RELAXATION;

D O I：

10.1021/acs.jpclett.7b01516

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：

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-a 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-a 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.

引用

页码：3544 / 3548

页数：5

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