Ionic conductivity of deep eutectic solvents: The role of orientational dynamics and glassy freezing

Abstract

We have performed a thorough examination of the reorientational relaxation dynamics and the ionic charge transport of three typical deep eutectic solvents, ethaline, glyceline and reline by broadband dielectric spectroscopy. Our experiments cover a broad temperature range from the low-viscosity liquid down to the deeply supercooled state, allowing to investigate the significant influence of glassy freezing on the ionic charge transport in these systems. In addition, we provide evidence for a close coupling of the ionic conductivity in these materials to reorientational dipolar motions which should be considered when searching for deep eutectic solvents optimized for electrochemical applications.

9 pages, 6 figures + Supplementary Information (1 page, 1 figure)

References in corpus (3)

• Temperature development of glassy alpha-relaxation dynamics determined by broadband dielectric spectroscopy
• High-frequency dynamics of type-B glass formers investigated by broadband dielectric spectroscopy
• Dielectric and conductivity relaxation in mixtures of glycerol with LiCl

Cited by in corpus (5)

• Translational and reorientational dynamics in deep eutectic solvents
• Universal correlations between the fragility and interparticle repulsion of glass-forming liquids
• Plastic-crystalline solid-state electrolytes: Ionic conductivity and orientational dynamics in nitrile mixtures
• Ionic conductivity and relaxation dynamics in plastic-crystals with nearly globular molecules
• Ionic conductivity of a lithium-doped deep eutectic solvent: Glass formation and rotation-translation coupling