Anomalous and Not-So-Common Behavior in Common Ionic Liquids and Ionic Liquid-Containing Systems

• Main Authors: José M. S. S. Esperança, Mohammad Tariq, Ana B. Pereiro, João M. M. Araújo, Kenneth R. Seddon, Luis Paulo N. Rebelo
• Format: Article
• Language: English
• Published: Frontiers Media S.A. 2019-06-01
• Series: Frontiers in Chemistry
• Subjects: ionic liquids; unusual behavior; thermal expansion coefficient; viscosity; surface tension; odd-even effects
• Online Access: https://www.frontiersin.org/article/10.3389/fchem.2019.00450/full

This work highlights unexpected, not so well known responses of ionic liquids and ionic liquid-containing systems, which are reported in a collective manner, as a short review. Examples include: (i) Minima in the temperature dependence of the isobaric thermal expansion coefficient of some ILs; (ii) Viscosity Minima in binary mixtures of IL + Molecular solvents; (iii) Anomalies in the surface tension within a family of ILs; (iv) The constancy among IL substitution of Cp/Vm at and around room temperature; (v) ILs as glass forming liquids; (vi) Alternate odd-even side alkyl chain length effects; (vii) Absolute negative pressures in ILs and IL-containing systems; (viii) Reversed-charged ionic liquid pairs; (ix) LCST immiscibility behavior in IL + solvent systems.