Solid-liquid equilibria of binary mixtures of fluorinated ionic liquids
authors Teles, ARR; Correia, H; Maximo, GJ; Rebelo, LPN; Freire, MG; Pereiro, AB; Coutinhoa, JAP
nationality International
journal PHYSICAL CHEMISTRY CHEMICAL PHYSICS
keywords HEXAFLUOROPHOSPHATE SALTS; SURFACE-PROPERTIES; HEAT-CAPACITY; PHASE; BEHAVIOR; SIMULATIONS; MISCIBILITY; PREDICTION; CATIONS; ALKYL
abstract Within ionic liquids, fluorinated ionic liquids (FILs) present unique physico-chemical properties and potential applications in several fields. However, the melting point of these neoteric compounds is usually higher due to the presence of fluorine atoms. This drawback may be resolved by, for instance, mixing different FILs to create eutectic mixtures. In this work, binary mixtures of fluoro-containing and fluorinated ionic liquids were considered with the aim of decreasing their melting temperatures as well as understanding and characterizing these mixtures and their phase transitions. Five FILs were selected, allowing the investigation of four binary mixtures, each of them with a common ion. Their solid-liquid and solid-solid equilibria were studied by differential scanning calorimetry and the non-ideality of the mixtures was investigated. Overall, a variety of solid-liquid equilibria with systems exhibiting eutectic behavior, polymorphs with solid-solid phase transitions, and the formation of intermediate compounds and solid solutions were surprisingly found. In addition to these intriguing behaviours, novel FILs with lower melting temperatures were obtained by the formation of binary systems, thus enlarging the application range of FILs at lower temperatures.
publisher ROYAL SOC CHEMISTRY
issn 1463-9076
year published 2016
volume 18
issue 36
beginning page 25741
ending page 25750
digital object identifier (doi) 10.1039/c6cp05372f
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000384249300106
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