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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Structure and nanostructure in ionic liquids.
Journal ArticleDOI
Ionic Liquids at Electrified Interfaces
TL;DR: One of the advantages of RTILs as compared to their high-temperature molten salt (HTMS) “sister-systems” is that the dissolved molecules are not imbedded in a harsh high temperature environment which could be destructive for many classes of fragile (organic) molecules.
Journal ArticleDOI
Mixtures of ionic liquids.
TL;DR: This work reviews the available literature of mixtures of ionic liquid mixtures to identify how their properties change and the possibility for their application.
Journal ArticleDOI
Surface tension of ionic liquids and ionic liquid solutions
Mohammad Tariq,Mara G. Freire,Mara G. Freire,Benilde Saramago,João A. P. Coutinho,José N. Canongia Lopes,José N. Canongia Lopes,Luís Paulo N. Rebelo +7 more
TL;DR: This critical review analyses most of the surface tension data reported between 2001 and 2010 (187 references) and concludes that ionic liquids present characteristic surface behavior and distinctive trends of their surface tension versus temperature.
Journal ArticleDOI
Ionic liquids behave as dilute electrolyte solutions
Matthew A. Gebbie,Markus Valtiner,Xavier Banquy,Eric T. Fox,Wesley A. Henderson,Jacob N. Israelachvili +5 more
TL;DR: The results indicate that ionic liquids screen charged surfaces through the formation of both bound (Stern) and diffuse electric double layers, where the diffuse double layer is comprised of effectively dissociated ionic liquid ions.
References
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Journal ArticleDOI
Surface Structural Study on Ionic Liquids Using Metastable Atom Electron Spectroscopy
Takashi Iwahashi,Toshio Nishi,Hiroyuki Yamane,Takayuki Miyamae,Kaname Kanai,Kazuhiko Seki,Doseok Kim,Yukio Ouchi +7 more
TL;DR: The surface structures of ionic liquids 1-CnH2n+1-3methylimidazolium tetrafluoroborate (BF4−), trifluoromethanesulfonate (OTf) and bis(trifluorsulfonyl)amide (TFSA) with n = 4, 8, and 10 are given in this paper.
Journal ArticleDOI
Water adsorption on a liquid surface.
Kevin R. J. Lovelock,Emily F. Smith,Alexey Deyko,Ignacio J. Villar-Garcia,Peter Licence,Robert G. Jones +5 more
TL;DR: Monolayer adsorption of water onto an ionic liquid in ultra-high vacuum has been demonstrated, revealing a heat of adsorptive which exceeds the heat of absorption into the bulk liquid by approximately 40 kJ mol(-1).
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Molecular dynamics simulations of the liquid surface of the ionic liquid 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide: structure and surface tension.
TL;DR: The use of local pressure profiles provides an explanation to the systematic problems encountered by several researchers to obtain accurate values of the surface tension at low temperature, due to the repulsion-dispersion and electrostatic interactions.
Journal ArticleDOI
Surface characterization of imidazolium ionic liquids by high-resolution Rutherford backscattering spectroscopy and X-ray photoelectron spectroscopy
TL;DR: In this paper, the surface composition of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM] [PF 6 ]) and 1- butyl- 3-methyl-methyl-dichyanamide (DCA) was studied by high-resolution Rutherford backscattering spectroscopy.
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Liquid-vapor interface of an ionic fluid
TL;DR: In this paper, the authors investigated the liquid-vapor interface of the restricted primitive model (RPM) for an ionic fluid using a density-functional approximation based on correlation functions of the homogeneous fluid as obtained from the mean-spherical approximation.