Universal scaling behavior of entropy and conductivity in ionic liquids

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Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: Cheng S., Musiał M., Wojnarowska Z., Ngai K.L., Jacquemin J., Paluch M.

Publisher: Elsevier

Publication year: 2020

Journal: Journal of Molecular Liquids (0167-7322)

Volume number: 316

ISSN: 0167-7322

URL: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088922942&origin=inward

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The density scaling behavior of dynamics and thermodynamics is investigated in ionic liquids. By comparing the scaling exponent of different dynamic quantities (dc-conductivity, viscosity, and diffusion) of a series of homologous ionic liquids, we discover that longer alkyl chain in the cation provides lower scaling value. Additionally, a systematic study on the entropy scaling behavior is carried out based on various samples within different structures and strength of interactions between anions and cations. Interestingly, for all tested samples, a linear relationship between Grüneisen parameter (scaling exponent) and entropy was obtained, and more importantly, the generated slope shows a close relation to the typical interactions (van der Waals and Coulomb forces, and H-bonds). Therefore, we establish a new correlation for this group of compounds.


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Last updated on 2021-14-06 at 23:19