Journal ArticleDOI
Orientation and mutual location of ions at the surface of ionic liquids
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TLDR
The structure of the liquid-vacuum interface in room temperature ionic liquids (ILs) is investigated using angle-resolved X-ray photoelectron spectroscopy (ARXPS) and synchrotron SXPS and it is shown unequivocally that this layer is not due to the presence of impurities.Abstract:
The structure of the liquid–vacuum interface in room temperature ionic liquids (ILs) is investigated using angle-resolved X-ray photoelectron spectroscopy (ARXPS) and synchrotron X-ray photoelectron spectroscopy (SXPS). By varying the polar angle and comparing the results for the chosen ionic liquids, we identify the presence of a surface layer that is chemically different to the bulk. In particular, this layer: (i) is enriched by aliphatic carbon atoms from the saturated carbon chains of the anions and cations, and (ii) contains an unequal distribution of cations and anions in a direction normal to the surface. This unequal distribution creates a potential gradient which extends from the surface into the liquid. We show unequivocally that this layer is not due to the presence of impurities.read more
Citations
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Surface tension, interfacial tension and contact angles of ionic liquids
TL;DR: The relationship between surface tension and molecular structure of ionic liquids has been investigated in the literature as discussed by the authors, but only general trends have been identified so far, and only a few examples from the literature are used to illustrate what is currently known.
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Amino acid-based ionic liquids: using XPS to probe the electronic environment via binding energies
TL;DR: A linear correlation is presented which suggests that the functional side chain, or R group, of the amino acid has little impact upon the electronic environment of the charge-bearing moieties within the anions and cations studied.
Journal ArticleDOI
Molecular-scale insights into the mechanisms of ionic liquids interactions with carbon nanotubes.
TL;DR: By applying an electric potential on the CNT electrode and/or varying the structure of molecular ions it is possible to change molecular ion orientations at the surface and, consequently, the Structure of the electrical double layer at the C NT-RTIL interface is changed.
Journal ArticleDOI
Dynamic Electrowetting and Dewetting of Ionic Liquids at a Hydrophobic Solid–Liquid Interface
TL;DR: The dynamic electrowetting and dewetting of ionic liquids are investigated with high-speed video microscopy and have implications for the design and control of electro-optical imaging systems, microfluidics, and fuel cells.
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Bulk and Liquid–Vapor Interface of Pyrrolidinium-Based Ionic Liquids: A Molecular Simulation Study
Xavier Paredes,Josefa Fernández,Agilio A. H. Padua,Agilio A. H. Padua,Patrice Malfreyt,Patrice Malfreyt,Friedrich Malberg,Barbara Kirchner,Alfonso S. Pensado,Alfonso S. Pensado +9 more
TL;DR: The structure of the bulk phase of the three 1-butyl-1-methylpyrrolidinium ionic liquids has been interpreted using radial and spatial distribution functions and structure factors that allows us to characterize the morphology of the polar and nonpolar domains present in this family of liquids.
References
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Journal ArticleDOI
Quantitative electron spectroscopy of surfaces: A standard data base for electron inelastic mean free paths in solids
Martin P. Seah,W. A. Dench +1 more
TL;DR: In this paper, a compilation of all published measurements of electron inelastic mean free path lengths in solids for energies in the range 0-10 000 eV above the Fermi level is presented.
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Influence of chloride, water, and organic solvents on the physical properties of ionic liquids
TL;DR: The first systematic study of the effect of impurities and additives (e.g., water, chloride, and cosolvents) on the physical properties of room-temperature ionic liquids was performed in this article.
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Nanostructural Organization in Ionic Liquids
TL;DR: As the length of the alkyl chain increases, the nonpolar domains become larger and more connected and cause swelling of the ionic network, in a manner analogous to systems exhibiting microphase separation.