Fast solute diffusivity in ionic liquids with silyl or siloxane groups studied by the transient grating method

Endo, Takatsugu; Nemugaki, Shinya; Matsushita, Yuki; Sakai, Yasuhiro; Ozaki, Hiroaki; Hiejima, Yusuke; Kimura, Yoshifumi; Takahashi, Kenji

doi:10.1016/j.chemphys.2016.03.016

Cited by 12 publications

(9 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…found that, at 295 K, the silyl‐based [Si−C 1 ‐mim][NTf 2 ] IL has higher density (1.43 g cm −3 ) than that of siloxane‐based [(SiOSi)−C1‐mim][NTf 2 ] IL (1.32 g cm −3 ). Comparing the results reported by Endo et al . for [Si−C 3 ‐mim][NTf 2 ] IL at 295 K (1.317 g cm −3 ) and those measured in this work at 293 (1.319 g cm −3 ) and 298 K (1.315 g cm −3 ) for [Si−C 1 −C 3 mim][NTf 2 ] indicates that the additional methyl group in the side chain of [Si−C 1 −C 3 mim][NTf 2 ] does not significantly affect IL density.…”

Section: Resultssupporting

confidence: 83%

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO₂/N₂ Permeation Properties

Gouveia

Soares

Simões

et al. 2019

Israel Journal of Chemistry

View full text Add to dashboard Cite

Novel functionalized ionic liquid (IL) combining an imidazolium‐based cation with branched alkyl chain bearing silyl group, 1‐methyl‐3‐(2‐methyl‐3‐(trimethylsilyl)propyl)imidazolium ([Si−C1−C3‐mim]+), and bis(trifluoromethylsulfonyl)imide ([NTf2]−) anion was synthesized and its thermophysical properties (density, viscosity, surface tension, surface entropy and enthalpy, thermal stability) were studied in a wide temperature range and compared with those of ILs having linear alkyl ([Cn‐mim][NTf2]) and siloxane ([(SiOSi)C1mim][NTf2]) side chains. It was found that at 25 °C [Si−C1−C3‐mim][NTf2] is a liquid with dynamic viscosity of 224 cP (224 mPa s) and density of 1.32 g cm−3. The presence of side branched alkyl chain with trimethylsilyl end‐group prevents crystallization of IL and leads to higher viscosities and lower densities in comparison with commonly known [Cn‐mim][NTf2] (n=2–4). As surface excess enthalpy was found to be in the lower end of the usual range of values for ILs, the interactions between silyl‐functionalized cation and [NTf2] anion can be considered as relatively weak. Finally, [Si−C1−C3‐mim][NTf2] was used for the preparation of polymer supported ionic liquid membranes (SILMs) and their CO2 and N2 permeation properties at 20 °C and 100 kPa were determined: permeability PCO2=311, PN2=12 Barrer, diffusivity DCO2=115×1012, DN2=227×1012 m2 s−1 and CO2/N2 permselectivity αCO2/N2=25.3.

show abstract

Section: Resultssupporting

confidence: 83%

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO₂/N₂ Permeation Properties

Gouveia

Soares

Simões

et al. 2019

Israel Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…Second, they exhibit rapid solute diffusivity and enhanced ionic conductivity. [117,118] Third, ILs are suitable for the functionalization of both micro-and macrosiloxane molecules. [119][120][121][122] Micromolecular siloxane and cyclic oligosiloxane-based ILs can exhibit fluidity at low temperature, quite compatible with current liquid electrolytes.…”

Section: Ils Functionalized Organosilicon Electrolytesmentioning

confidence: 99%

Organosilicon‐Based Functional Electrolytes for High‐Performance Lithium Batteries

Wang

Chen

et al. 2021

Advanced Energy Materials

View full text Add to dashboard Cite

Nowadays excessive consumption of fossil fuels due to population growth and industrial development induced serious energy and environmental crisis. To alleviate the ecological crisis and comply with the ever-increasing energy demand, developingThe electrolyte has been considered as a key factor toward higher energy density for Li-ion and Li-metal batteries. However, conventional electrolytes suffer from uncontrolled interfacial reactions and irreversible decomposition causing performance deterioration and potential safety hazard. Organosilicon compounds have attracted great interest as promising electrolyte components due to facile chemical modifications, low glass transition temperatures (T g ), superior chemical, and thermal stabilities. Considerable investigation efforts have been devoted to developing better overall performance of organosilicon-based electrolytes in the past few years. Herein, the recent research progress of organosilicon-based functional electrolytes for the development of liquid, gel, and solid state electrolytes in Li-ion and Li-metal batteries is summarized. Attention is devoted to various types of organosilicon such as silane, siloxane, polysiloxane, and polyhedral oligomeric silsesquioxanes in terms of molecular design, ionic conductivity, functions shown in batteries, thermal, chemical, electrochemical stability, safety, etc. The feasible strategies are also discussed that may promote the comprehensive electrochemical performances of organosilicon-based electrolytes in different types of electrolytes and batteries. Finally, the challenges facing organosilicon-based electrolytes and proposed their possible solutions are presented alongside promising development directions.

show abstract

“…In particular, Endo and co-workers reported the translational diffusion of solutes in viscoelastic solvents including ionic liquids and silicone oils. 37 Compared to solvents of similar viscosities, the deviation from the SE relation was especially large in silicone oils. The viscoelastic relaxation of silicone oil is slow as we have demonstrated in our previous work.…”

Section: Resultsmentioning

confidence: 99%

“…There have been many studies on the translational diffusion of small solute molecules, where large deviation from the hydrodynamic SE model was reported. In particular, Endo and co-workers reported the translational diffusion of solutes in viscoelastic solvents including ionic liquids and silicone oils . Compared to solvents of similar viscosities, the deviation from the SE relation was especially large in silicone oils.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Reorientational Relaxation of Small Solutes in Viscoelastic Liquids

2016

View full text Add to dashboard Cite

The reorientational relaxation times of some small aromatic solutes are determined with nuclear magnetic resonance spectroscopy and time-resolved fluorescence anisotropy measurements in various solvents that exhibit viscoelasticity in the megahertz region. All the reorientational relaxation times in viscoelastic liquids are shorter than those predicted by the hydrodynamic Stokes-Einstein-Debye (SED) relation using the steady-state shear viscosity. The deviation from the SED relation becomes larger in solvents whose shear relaxation is slower. When the reorientational relaxation times in a solvent are compared, the deviation from the SED relation tends to decrease when the reorientational relaxation time increases. From a comparison with the shear relaxation spectra, it is demonstrated that the deviation from the SED relation can be ascribed to the effective reduction of the viscous friction on fast reorientation, reflecting the decrease in shear viscosity with increasing frequency.

show abstract

Fast solute diffusivity in ionic liquids with silyl or siloxane groups studied by the transient grating method

Cited by 12 publications

References 56 publications

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO₂/N₂ Permeation Properties

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO₂/N₂ Permeation Properties

Organosilicon‐Based Functional Electrolytes for High‐Performance Lithium Batteries

Reorientational Relaxation of Small Solutes in Viscoelastic Liquids

Contact Info

Product

Resources

About

Fast solute diffusivity in ionic liquids with silyl or siloxane groups studied by the transient grating method

Cited by 12 publications

References 56 publications

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO2/N2 Permeation Properties

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO2/N2 Permeation Properties

Organosilicon‐Based Functional Electrolytes for High‐Performance Lithium Batteries

Reorientational Relaxation of Small Solutes in Viscoelastic Liquids

Contact Info

Product

Resources

About

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO₂/N₂ Permeation Properties

Ionic Liquid with Silyl Substituted Cation: Thermophysical and CO₂/N₂ Permeation Properties