Slow molecular mobility in the amorphous solid and the metastable liquid states of three 1-alkyl-3-methylimidazolium chlorides

被引：16

作者：

Diogo, Herminio P. ^{[1
]}

Pinto, Susana S. ^{[2
,3
]}

Moura Ramos, Joaquim J. ^{[1
]}

机构：

[1] Univ Tecn Lisboa, IST, CQE, P-1049001 Lisbon, Portugal

[2] Univ Tecn Lisboa, CQFM, P-1049001 Lisbon, Portugal

[3] Univ Tecn Lisboa, Inst Super Tecn, IN Inst Nanosci & Nanotechnol, P-1049001 Lisbon, Portugal

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2013年 / 178卷

关键词：

RTIL; Ionic liquid; TSDC; Thermally stimulated current; Secondary-relaxation; alpha-Relaxation; Liquid-liquid transition; STIMULATED DEPOLARIZATION CURRENTS; TEMPERATURE IONIC LIQUIDS; GLASS-TRANSITION TEMPERATURE; DIFFERENTIAL SCANNING CALORIMETRY; ROOM-TEMPERATURE; DIELECTRIC-RELAXATION; CRYSTAL POLYMORPHISM; SUPERCOOLED LIQUIDS; COOLING RATE; TLL EVENT;

D O I：

10.1016/j.molliq.2012.11.027

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：

The slow molecular mobility in three ionic liquids, 1-alkyl-3-methylimidazolium chlorides with alkyl tails C-4, C-6 and C-8, has been investigated by thermally stimulated depolarization currents (TSDC) and differential scanning calorimetry (DSC), in a temperature interval including the amorphous solid and the supercooled liquid state. A specific feature of these ionic liquids, compared with typical molecular liquids, is the existence of a slow relaxation close to the main relaxation but above T-g, which is cooperative and shows a high dielectric strength. (C) 2012 Elsevier B.A. All rights reserved.

引用

页码：142 / 148

页数：7

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