Journal ArticleDOI
Orientational dynamics in a lyotropic room temperature ionic liquid.
TLDR
Comparison of the OmimCl/water data with the previously reported room temperature ionic liquid/water OHD-OKE decays supports the previous hypothesis that the biexponential dynamics are due to the approach to the liquid-gel transition and suggests that the order of the concentration-dependent phase transition can be tuned by the choice of anion.Abstract:
In a previous study of room temperature ionic liquid/water mixtures, the first clearly observed biexponential decays in optical heterodyne-detected optical Kerr effect (OHD-OKE) experiments on a liquid were reported, (Sturlaugson, A. L.; Fruchey, K. S.; Fayer, M. D. J. Phys. Chem. B 2012, 116, 1777), and it was suggested that the biexponential behavior is indicative of the approach to gelation. Here, new OHD-OKE experiments on mixtures of the room temperature ionic liquid 1-methyl-3-octylimidazolium chloride (OmimCl) with water are presented. The OmimCl/water system is shown to gel over the water mole fraction range of 0.69–0.81. In the OHD-OKE decays, the biexponential behavior becomes more distinct as the gelling concentration range is approached from either high or low water concentrations. The biexponential decays are analyzed in terms of the wobbling-in-a-cone model, and the resulting diffusion constants and “relative” order parameters and cone angles are reported. Comparison of the OmimCl/water data...read more
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Journal ArticleDOI
Multiscale Studies on Ionic Liquids
TL;DR: The present review aims to summarize the recent advances in the fundamental and application understanding of ILs, and introduces the structures and properties of typical ILs.
Journal ArticleDOI
Microstructural and Dynamical Heterogeneities in Ionic Liquids.
Yong-Lei Wang,Bin Li,Sten Sarman,Francesca Mocci,Zhong-Yuan Lu,Jiayin Yuan,Aatto Laaksonen,Michael D. Fayer +7 more
TL;DR: This review comprehensively trace recent advances in understanding delicate interplay of strong and weak interactions that underpin their complex phase behaviors with a particular emphasis on understanding heterogeneous microstructures and dynamics of ILs in bulk liquids, in mixtures with cosolvents, and in interfacial regions.
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"Solvent-in-salt" systems for design of new materials in chemistry, biology and energy research.
Vladimir A. Azov,Ksenia S. Egorova,Marina M. Seitkalieva,Alexey S. Kashin,Valentine P. Ananikov +4 more
TL;DR: Inorganic and organic "solvent-in-salt" (SIS) systems have been known for decades but have attracted significant attention only recently and demonstrate remarkable thermal stability and tunability, and present a class of admittedly safer electrolytes, in comparison with traditional organic solvents.
Journal ArticleDOI
Dynamics and structure of room temperature ionic liquids
TL;DR: In this article, the relationship between room temperature ionic liquids (RTILs) dynamics and structure has been investigated using time resolved fluorescence anisotropy measurements in the organic and ionic regions of RTILs.
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Carbon dioxide in an ionic liquid: Structural and rotational dynamics
Chiara H. Giammanco,Patrick L. Kramer,Steven A. Yamada,Jun Nishida,Amr Tamimi,Michael D. Fayer +5 more
TL;DR: To separate the RISD contribution to the FFCF from the structural spectral diffusion contribution, the previously developed first order RISD model is reformulated to describe the second order (quadratic) Stark effect--the first order Stark effect vanishes because CO2 does not have a permanent dipole moment.
References
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