11 research outputs found
Phosphonium cation-based ionic liquids as neat lubricants: Physicochemical and tribological performance
© 2015 Elsevier Ltd.This paper studies physicochemical properties (density, viscosity, corrosion, thermogravimetry, and conductivity) and tribological behavior of five phosphonium cation-based ionic liquids ([P66614][BEHP], [P66614][C8C8PO2], [P66614][NTf2], [P44414][DBS], and [P4442][DEP]) as neat lubricants within steel-steel contact. A reciprocating ball-on-disc configuration was used to perform tribological tests. Worn surfaces were analyzed by confocal microscopy, SEM, EDS and XPS. Main results showed that: [P66614][NTf2], [P44414][DBS], and [P4442][DEP] showed corrosion activity; the ionic liquids with more reactive phosphate type anion ([P66614][BEHP] and [P4442][DEP]) had the best tribological behavior; the best tribological results were related to the tribofilm formation of two phosphate species
A novel organosilicon-based ionic plastic crystal as solid-state electrolyte for lithium-ion batteries
Hepatic Adenosine Triphosphate Reduction Through the ShortâChain Fatty AcidsâPeroxisome ProliferatorâActivated Receptor ÎłâUncoupling Protein 2 Axis Alleviates ImmuneâMediated Acute Hepatitis in InulinâSupplemented Mice
Phase Behavior of 1-Dodecyl-3-methylimidazolium Fluorohydrogenate Salts (C 12
The effects of the HF composition, n, in 1-dodecyl-3-methylimidazolium fluorohydrogenate salts (CââMIm(FH)âF, n = 1.0â2.3) on their physicochemical and structural properties have been investigated using infrared spectroscopy, thermal analysis, polarized optical microscopy, X-ray diffraction, and anisotropic ionic conductivity measurements. The phase diagram of CââMIm(FH)âF (n vs transition temperature) suggests that CââMIm(FH)âF is a mixed crystal system that has a boundary around n = 1.9. For all compositions, a liquid crystalline mesophase with a smectic A interdigitated bilayer structure is observed. The temperature range of the mesophase decreases with increasing n value (from 61.8 °C for CââMIm(FH)â.âF to 37.0 °C for CââMIm(FH)â.âF). The layer spacing of the smectic structure decreases with increasing n value or increasing temperature. Two structural types with different layer spacings are observed in the crystalline phase (type I, 1.0 †n †1.9, and type II, 1.9 †n †2.3). Ionic conductivities parallel and perpendicular to the smectic layers (Ï|| and Ïâ„) increase with increasing n value, whereas the anisotropy of the ionic conductivities (Ï||/Ïâ„) is independent of the n value, since the thickness of the insulating sheet formed by the dodecyl group remains nearly unchanged