Themed collection Dense ionic fluids
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Electric field induced associations in the double layer of salt-in-ionic-liquid electrolytes
We have developed a theory for the electrical double layer of salt-in-ionic liquids accounting for the thermoreversible association of ions into Cayley tree aggregates. We find that the solution becomes more aggregated at moderate positive voltages.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00021H
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Ion transport in polymerized ionic liquids: a comparison of polycation and polyanion systems
Four model 1,2,3-triazole-based polyILs with polycation or polyanion backbones, are investigated to understand the impact of mobile ion types and backbone chemical structure.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00070F
Tailored carbon dioxide capacity in carboxylate-based ionic liquids
Tetraalkylphosphonium carboxylate ionic liquids absorb large quantities of carbon dioxide and are easily regenerated.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00052H
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Chain-length dependent organisation in mixtures of hydrogenous and fluorous ionic liquids
The ionic liquids [C10MIM][Tf2N] and [C10MIM-F17][Tf2N] are miscible in all proportions, but scattering studies and MD calculations show the formation of small aggregates. These data are discussed relative to hydrocarbon/fluorocarbon miscibility.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00047A
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Revisiting the driving force inducing phase separation in PEG–phosphate aqueous biphasic systems
We reinvestigated the PEG/K2HPO4/H2O systems using a combination of liquid-phase nuclear magnetic resonance and high-resolution Raman spectroscopies, coupled with injection microcalorimetry.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00058G
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Observation of cavitation dynamics in viscous deep eutectic solvents during power ultrasound sonication
We characterise the development of cavitation structure in three deep eutectic solvents of increasing viscosity, and water, via high-speed imaging and parallel acoustic detection..
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00031E
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Unravelling the complex speciation of halozincate ionic liquids using X-ray spectroscopies and calculations
Using a combination of liquid-phase X-ray spectroscopy experiments and small-scale calculations we have gained new insights into the speciation of halozincate anions in ionic liquids.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00029C
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Machine learning-driven investigation of the structure and dynamics of the BMIM-BF4 room temperature ionic liquid
We demonstrate a learning-on-the-fly procedure to train machine-learned potentials from single-point density functional theory calculations before performing production molecular dynamics simulations.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00025K
Deep eutectic solvents on a tightrope: balancing the entropy and enthalpy of mixing
We quantified the balance between excess enthalpy (interactions) and excess entropy (structure/disorder) of mixing that determines large melting point depressions in deep eutectic solvents (DESs), reformulating the role of hydrogen bonding in DESs.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00048J
Speciation and dipole reorientation dynamics of glass-forming liquid electrolytes: Li[N(SO2CF3)2] mixtures of 1,3-propane sultone or tetrahydrothiophene-1,1-dioxide
Li[(CF3SO2)2N] mixtures with propane sultone or sulfolane, newly termed as glass-forming liquid electrolytes, exhibited large-size aggregate (AGG) formation via speciation and dipole reorientation. The AGGs may be crucial for the unique Li+ conduction.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00050A
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Spiers Memorial Lecture: From cold to hot, the structure and structural dynamics of dense ionic fluids
This article presents a perspective on what we think are key topics related to the structure and structural dynamics of ILs and to some extent high-temperature molten salts.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00086B
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Exploring the structure of type V deep eutectic solvents by xenon NMR spectroscopy
Type V deep eutectic solvents thymol : camphor, menthol : thymol and eutectic mixtures based on menthol : carboxylic acids with variable chain length, are investigated to clarify the peculiar nanostructure of these materials..
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00083H
Dispersions of magnetic nanoparticles in water/ionic liquid mixtures
Nanoparticles of iron oxide are dispersed in mixtures of water and ionic liquid, here ethylammonium nitrate, and the NP/NP and NP/solvent interactions are studied.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00028E
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Wave mechanics in an ionic liquid mixture
We present measurements and analysis of the interactions between macroscopic bodies across a fluid mixture of two ionic liquids of widely diverging ionic size.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00040D
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Chemical models for dense solutions
Here we examine the question of the chemical models widely used to describe dense solutions, particularly ionic solutions.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00084F
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Overdetermination method for accurate dynamic ion correlations in highly concentrated electrolytes
An experimental overdetermination method and a Reverse Monte Carlo-based approach lead to strongly reduced uncertainties of transport parameters for highly concentrated electrolytes and to accurate information about ion correlations and transport limitations in batteries.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00034J
Linear ether-based highly concentrated electrolytes for Li–sulfur batteries
Linear ether-based electrolytes show low solubility of the sulfur species, stability towards Li metal and polysulfide nucleophiles. Li–S cells using the lightweight electrolyte demonstrated an energy density exceeding 300 W h kg−1.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00024B
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Stability and structure of the aqueous LiTFSI–LiCl interface
The stability of the LiCl/LiTFSI interface increases with the concentration of both electrolytes, but mainly LiCl.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00026A
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Cationic micelles in deep eutectic solvents: effects of solvent composition
The size of cationic micelles in a pTSA based deep eutectic solvent can be tuned by changing the solvent composition, which alters the surfactant–solvent interactions.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00045E
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Heterogeneous Li coordination in solvent-in-salt electrolytes enables high Li transference numbers
Unusually high Li transference numbers (t+ > 0.7) in a bisolvent-in-salt electrolyte are explained by a heterogeneous Li solvation structure, which yields two distinctly different Li species with different transport behavior.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00012A
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Stabilization of lithium metal in concentrated electrolytes: effects of electrode potential and solid electrolyte interphase formation
Reversible lithium plating/stripping in concentrated electrolytes is discussed from the viewpoints of liquid structure, lithium electrode potential, and solid-electrolyte-interphase formation.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00038B
Speciation of the proton in water-in-salt electrolytes
In 21 m LiTFSI water-in-salt electrolyte, the proton forms species existing in bulk water (H3O+, H5O2+, etc.) as well as the HTFSI acid, known to be a superacid in water.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00027G
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Overcoming passivation through improved mass transport in dense ionic fluids
Formation of metal passivation layers during electrochemical dissolution is prevented by the use of ultrasound. Migration becomes the main method of mass transport across the electrical double layer.
Faraday Discuss., 2024, Advance Article
https://doi.org/10.1039/D4FD00030G
About this collection
We are delighted to share with you a selection of the papers associated with a Faraday Discussion on Dense ionic fluids. More information about the related event may be found here: http://rsc.li/ionic-fd2024. Additional articles will be added to the collection as they are published. The final versions of all the articles presented and a record of the discussions will be published after the event.
The meeting will comprise the following four interrelated themes: Structure and dynamics in dense ionic fluids, Ionic fluids at equilibrium: thermodynamics, nanostructure, phase behaviour and activity, Ionic fluids out of equilibrium: electrodeposition, dissolution, electron transfer and driving forces, Interfaces and particles in dense ionic fluids: biological and colloidal systems spanning multiple length scales.
On behalf of the Scientific Committee, we hope you join us and participate in this exciting event, and that you enjoy these articles and the record of the discussion.