Molecular level interactions in binary mixtures of 1-ethyl 3-methylimidazolium tetrafluoroborate and water

Marium, Mayeesha; Rahman, Mohammad Mizanur; Mollah, M. Yousuf A.; Susan, Md. Abu Bin Hasan

doi:10.1039/c5ra00083a

Cited by 18 publications

(9 citation statements)

References 55 publications

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“…31 Marium and co-workers reported the presence of large aggregated clusters of [C 2 mim][BF 4 ] in its binary mixtures with water, having an average correlation diameter of ∼354− 900 nm. 32 This work investigates the prospect and extent of the longrange density fluctuation in various binary mixtures of ILs themselves. Binary mixtures of two ILs have relatively been a very new field, with a little to no concrete understanding on their physicochemical, dynamical, and structural aspects.…”

Section: Introductionmentioning

confidence: 99%

Ultraslow Relaxation in Aprotic Double Salt Ionic Liquids

Rahman

Mollah

et al. 2019

J. Phys. Chem. B

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A mixture of two pure ionic liquids (ILs) or double salt ILs (DSILs) can push the limits of ILs in terms of unraveling their unique physicochemical properties and potential in clean technology. While the correlated ion dynamics and heterogeneity in the bulk of pure ILs have been reported, such a phenomenon at longer timescales in DSILs has never been elucidated. Here, a combination of temperature-dependent polarized dynamic light scattering and rheological measurements has been employed to reveal the presence of structural and ultraslow relaxation in three DSILs, each containing a 1-ethyl-3-methylimidazolium cation and two different anions. The slow relaxation caused by Brownian diffusion of cluster-like arrangements occurs at a timescale of a few to several hundred milliseconds; both the relaxation processes, nevertheless, are Arrhenius in nature. Notably, slow relaxation in the DSILs is much different compared to that in the pure ILs. The decay of intensity correlation functions (ICFs) and average hydrodynamic correlation length of the clusters and their response to temperature markedly vary with the nature of the two anions present in the DSILs. Stretched exponential analyses of the ICFs disclose the cluster-to-cluster transfer of ionic species as well as percolation dynamics among clusters. The identity of anions also governs whether the DSILs follow or violate the Stokes–Einstein relationship or not.

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Section: Introductionmentioning

confidence: 99%

Ultraslow Relaxation in Aprotic Double Salt Ionic Liquids

Rahman

Mollah

et al. 2019

J. Phys. Chem. B

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“…For C 2 ImHSO 4 - w 0 , no texture was observed over the measured hydration range (5 ≤ w 0 ≤ 80) (Figure b). DLS measurements suggested that C 2 ImHSO 4 - w 0 also formed an L 1 solution. , As shown in Figure b, the hydrodynamic diameter of [C 2 MIm][HSO 4 ] micelles was determined to be 0.6 nm, which was smaller than that of [C 14 MIm][HSO 4 ]. Larger micelles corresponding to sizes of 255.1 and 531.1 nm were observed for C 2 ImHS-60 and C 2 ImHSO 4 -30, respectively.…”

Section: Resultsmentioning

confidence: 91%

“…DLS measurements suggested that C 2 ImHSO 4 -w 0 also formed an L 1 solution. 24,25 As shown in Figure 2b According to weight fractions and densities, the calculated thicknesses of the water layer decreased from 2.41 to 1.48 nm (Table S1 of the Supporting Information). The 2D 1 H NMR spectrum (Figure S1d of the Supporting Information) suggested that imidazolium rings aggregated to form an interdigitated bilayer structure.…”

Section: ■ Experimental Sectionmentioning

confidence: 92%

Lamellar Lyotropic Liquid Crystal Superior to Micellar Solution for Proton Conduction in an Aqueous Solution of 1-Tetradecyl-3-methylimidazolium Hydrogen Sulfate

You

Tan

et al. 2020

ACS Appl. Mater. Interfaces

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Humidified perfluorosulfonic acid polymers with a nanoscopic phase-separated morphology are highly proton-conductive materials for fuel cells, yet morphology tuning of the acidic materials for enhanced conduction remains a challenge. Aqueous acidic lyotropic liquid crystals (LLCs) provide a powerful platform to construct welldefined nanostructures for proton conduction. We report an aqueous LLC formed by 1-tetradecyl-3-methylimidazolium hydrogen sulfate, exhibiting a proton conductivity of 210 mS cm −1 at 25 °C, which surpasses that formed by alkylsulfonic acid, thus demonstrating that a mobile acidic anion is more efficient than constrained sulfonic acid functionality to transport protons in LLCs. For an aqueous solution of 1-alkyl-3-methylimidazolium hydrogen sulfate, a lamellar LLC results in higher conductivity than a micellar solution under the same hydration conditions. The peak power density of the fuel cell fabricated from porous membranes filled with the lamellar LLC is four times as high as that filled with the micellar solution. The work offers an efficient way to construct highly proton-conductive LLC materials for fuel cell application.

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“…The thermophysical and thermodynamic properties of [EMIM] + [BF 4 ] − and their binary mixtures with water, − acetone, acetonitrile, DMSO, DMF, DMA, − 2-ethoxyethanol, 2.2.2trifluoroethanol, , cyclopentanone, cyclohexanone, methyl ethyl ketone, 2-pyrrolidone, 1-methyl-2-pyrrolidone, ,, aniline, N -methyl aniline, and 2-methyl aniline , have been reported in the literature at various temperatures. The binary mixtures reported for [EMIM] + [MeSO 4 ] − in the literature are with alcohols (C 1 –C 9 ) − and water, , and also, binary mixtures of [EMIM] + [MeSO 4 ] − with acetic and propionic acid are reported in the literature at temperatures of 298.15–318.15 K .…”

Section: Introductionmentioning

confidence: 99%

Intermolecular Interactions between 1-Ethyl-3-methylimidazolium-Based Ionic Liquids with Carboxylic Acid at Different Temperatures via Thermodynamic and Spectroscopic Studies

Masilo

Bahadur

2021

J. Chem. Eng. Data

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In this work, we studied the intermolecular interactions of binary mixtures of 1-ethyl-3-methylimidazolium-based ionic liquids (ILs) with acetic or propionic acid. The physicochemical behavior of the binary mixtures was investigated by measuring the thermophysical properties, including the density (ρ), sound velocity (u), and refractive index (n D ), over the complete range of the IL mole fraction at T = 293.15−333.15 K and p = 0.1 MPa. The surface tension (γ) of the binary mixtures was also measured at T = 298.15 K but not determined under other studied temperatures due to the lack of a temperature controller. The excess molar volumes (V m E ), excess isentropic compressibilities (k s E ), excess sound velocity (u E ), intermolecular free length (L f ), deviation in the refractive index (Δn D ), and deviation in the surface tension (Δγ) were determined from experimental results. These parameters were further fitted to the Redlich−Kister polynomial equation. FTIR studies of pure components and binary systems at an equimolar composition were conducted to clarify results from thermodynamic properties and also analyze the intermolecular interactions occurring in the mixture. A survey on available literature data was carried out to compare with our experimental data. The selected ILs allowed us to compare the influence of the anion on the thermophysical and thermodynamic properties the mixtures.

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Molecular level interactions in binary mixtures of 1-ethyl 3-methylimidazolium tetrafluoroborate and water

Abstract: NIR spectroscopic analysis and DLS measurements were carried out to study hydrogen bonding and aggregation in ionic liquid–water binary mixtures.

Cited by 18 publications

References 55 publications

Ultraslow Relaxation in Aprotic Double Salt Ionic Liquids

Ultraslow Relaxation in Aprotic Double Salt Ionic Liquids

Lamellar Lyotropic Liquid Crystal Superior to Micellar Solution for Proton Conduction in an Aqueous Solution of 1-Tetradecyl-3-methylimidazolium Hydrogen Sulfate

Intermolecular Interactions between 1-Ethyl-3-methylimidazolium-Based Ionic Liquids with Carboxylic Acid at Different Temperatures via Thermodynamic and Spectroscopic Studies

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