Inflection point in pressure dependence of ionic conductivity as a fingerprint of local structure formation

S. Koymeth, B. Yao, M. Paluch, M. Dulski, M. Swadzba-Kwasny, Z. Wojnarowska

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we employed dielectric spectroscopy to investigate the effect of temperature and pressure on the ion dynamics of phosphonium ionic liquids (ILs) differing by the length of an alkyl chain, [P ][TFSI] ( = 2, 6, 8, 12). We found that both temperature and pressure dependence of dc-conductivity (σ ) determined for all examined ILs herein exhibit unique characteristics, unusual for aprotic ILs. Two regions differing by ion self-organization have been identified from the derivative analysis of σ ( ) data. On the other hand, isothermal measurements performed at elevated pressure revealed a unique concave-convex character of σ ( ) dependences, resulting in a clear minimum in the pressure behavior of activation volume. Such an inflection point characterizing the pressure dependence of σ in [P ][TFSI] ILs can be considered an inherent feature of ion dynamics governed by structural self-assembly. Our results offer a unique perspective to link the ion mobility at various - conditions to the nanostructural organization of ionic systems.
Original languageEnglish
JournalThe Journal of Physical Chemistry B
Early online date08 May 2024
DOIs
Publication statusEarly online date - 08 May 2024

Fingerprint

Dive into the research topics of 'Inflection point in pressure dependence of ionic conductivity as a fingerprint of local structure formation'. Together they form a unique fingerprint.

Cite this