Effect of Alkyl Chain Length on the Magnitude of Dynamically Correlated Molecules and Dynamical Crossover in Alkyltriethylammonium-Based Ionic Liquids.

IF 2.8 2区 化学 Q3 CHEMISTRY, PHYSICAL
The Journal of Physical Chemistry B Pub Date : 2024-12-19 Epub Date: 2024-12-05 DOI:10.1021/acs.jpcb.4c05070
Beibei Yao, Marian Paluch, Zaneta Wojnarowska, Danuta Kruk
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引用次数: 0

Abstract

This study explores the impact of alkyl chain length on dynamic heterogeneity and dynamic crossover in alkyltriethylammonium-based ionic liquids ([TEA-R][TFSI]) with varying alkyl chain lengths (R = C6, C8, and C10). Using differential scanning calorimetry and broadband dielectric spectroscopy, we observed that these ionic liquids are excellent glassformers with notable ionic conductivity at room temperature. Furthermore, the number of dynamically correlated molecules at the glass transition temperature, reflecting the dynamic heterogeneity, is exceptionally small for TEA-R ILs and becomes more reduced with longer alkyl chains. Moreover, the temperature dependence of conductivity requires two Vogel-Fulcher-Tammann equations with distinct sets of fitting parameters for an accurate description. The crossover temperature Tb, indicating the transition to complex dynamics, increases with the alkyl chain length.

烷基链长度对烷基三乙基离子液体中动态相关分子大小和动态交叉的影响。
本研究探讨了烷基链长度对不同烷基链长度(R = C6, C8, C10)的烷基基三乙基铵离子液体([TEA-R][TFSI])的动态非均质性和动态交叉的影响。利用差示扫描量热法和宽带介电光谱,我们观察到这些离子液体在室温下具有显著的离子电导率,是优异的玻璃形成物。此外,在玻璃化转变温度下,反映动态非均质性的动态相关分子数量对于TEA-R il来说非常少,并且随着烷基链的延长而减少。此外,电导率的温度依赖性需要两个具有不同拟合参数集的Vogel-Fulcher-Tammann方程才能准确描述。交叉温度随着烷基链长度的增加而增加,表明向复杂动力学过渡。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.80
自引率
9.10%
发文量
965
审稿时长
1.6 months
期刊介绍: An essential criterion for acceptance of research articles in the journal is that they provide new physical insight. Please refer to the New Physical Insights virtual issue on what constitutes new physical insight. Manuscripts that are essentially reporting data or applications of data are, in general, not suitable for publication in JPC B.
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