Unusual ion transport behaviour of ethylammonium nitrate mixed with lithium nitrate

Filippov, Andrei; Alexandrov, A. S.; Gimatdinov, Rustam; Shah, Faiz Ullah

doi:10.1016/j.molliq.2021.116841

Cited by 5 publications

(4 citation statements)

References 48 publications

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“…51,52 They also noted an increase in the diffusion coefficient of lithium ions in micro-confined ethylammonium nitrate compared with that of the bulk IL. 95 Consistent with other reports, a possible cause of the positive deviation in the diffusion coefficient for the 1 μm IL films is a decrease in solvent viscosity near the substrate due to alterations in the intermolecular interactions. 48,51−53,95−98 Figure 5 shows the diffusion coefficient of ATTO 647 plotted with the ratio of temperature to the viscosity of the bulk solvent.…”

Section: ■ Results and Discussionsupporting

confidence: 90%

“…As previously mentioned, Filippov et al noted increased self-diffusion coefficients in micro-confined (∼3 to 4 μm) ILs compared with that of the bulk IL. , They also noted an increase in the diffusion coefficient of lithium ions in micro-confined ethylammonium nitrate compared with that of the bulk IL . Consistent with other reports, a possible cause of the positive deviation in the diffusion coefficient for the 1 μm IL films is a decrease in solvent viscosity near the substrate due to alterations in the intermolecular interactions. ,− ,− Figure shows the diffusion coefficient of ATTO 647 plotted with the ratio of temperature to the viscosity of the bulk solvent. The 1 μm films show the most non-linear dependence of the diffusion coefficient on the ratio of temperature to viscosity; the bulk solvent viscosity may not be an acceptable estimate for the 1 μm films.…”

Section: Resultssupporting

confidence: 70%

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Temperature-Dependent Constrained Diffusion of Micro-Confined Alkylimidazolium Chloride Ionic Liquids

et al. 2022

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Alkylimidazolium chloride ionic liquids (ILs) have many uses in a variety of separation systems, including micro-confined separation systems. To understand the separation mechanism in these systems, the diffusion properties of analytes in ILs under relevant operating conditions, including micro-confinement dimension and temperature, should be known. For example, separation efficiencies for various IL-based microextraction techniques are dependent on the sample volume and temperature. Temperature-dependent (20–100 °C) fluorescence recovery after photobleaching (FRAP) was utilized to determine the diffusion properties of a zwitterionic, hydrophilic dye, ATTO 647, in alkylimidazolium chloride ILs in micro-confined geometries. These micro-confined geometries were generated by sandwiching the IL between glass substrates that were separated by ∼1 to 100 μm. From the measured temperature-dependent FRAP data, we note alkyl chain length-, thickness-, and temperature-dependent diffusion coefficients, with values ranging from 0.021 to 46 μm2/s. Deviations from Brownian diffusion are observed at lower temperatures and increasingly less so at elevated temperatures; the differences are attributed to alterations in intermolecular interactions that reduce temperature-dependent nanoscale structural heterogeneities. The temperature- and thickness-dependent data provide a useful foundation for efficient design of micro-confined IL separation systems.

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Section: ■ Results and Discussionsupporting

confidence: 90%

Section: Resultssupporting

confidence: 70%

Temperature-Dependent Constrained Diffusion of Micro-Confined Alkylimidazolium Chloride Ionic Liquids

et al. 2022

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“…For many ILs, non-Arrhenius dependences are common. 65,66 The reason for this is that the glass transition temperature, T 0 , is close to the measurement temperature. Under such conditions, the diffusion data are better analyzed using a VFT equation (eqn (3)).…”

Section: Resultsmentioning

confidence: 89%

Physical and electrochemical properties of new structurally flexible imidazolium phosphate ionic liquids

Bhowmick

Filippov

Khan

et al. 2022

Phys. Chem. Chem. Phys.

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“…The behavior of these interfacial nanostructure is not due to chemical reactions at the interface, as the electrical potentials applied on HOPG are within the electrochemical window of EAN. [ 32 ] Instead, they mainly result from ion transport phenomena. This behavior is similar to that previously seen in pure EAN and EAN‐water mixtures on mica [ 20 ] and other self‐assembled soft matter systems.…”

Section: Resultsmentioning

confidence: 99%

Effect of Potential on the Nanostructure Dynamics of Ethylammonium Nitrate at a Graphite Electrode

Li,

Wang,

Warr

et al. 2023

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Video‐rate atomic force microscopy (AFM) is used to study the near‐surface nanostructure dynamics of the ionic liquid ethylammonium nitrate (EAN) at a highly oriented pyrolytic graphite (HOPG) electrode as a function of potential in real‐time for the first time. The effects of varying the surface potential and adding 10 wt% water on the nanostructure diffusion coefficient are probed. For both EAN and the 90 wt% EAN‐water mixture, disk‐like features ≈9 nm in diameter and 1 nm in height form above the Stern layer at all potentials. The nanostructure diffusion coefficient increases with potential (from OCP −0.5 V to OCP +0.5 V) and with added water. Nanostructure dynamics depends on both the magnitude and direction of the potential change. Upon switching the potential from OCP −0.5 V to OCP +0.5 V, a substantial increase in the diffusion coefficients is observed, likely due to the absence of solvophobic interactions between the nitrate (NO3−) anions and the ethylammonium (EA+) cations in the near‐surface region. When the potential is reversed, EA+ is attracted to the Stern layer to replace NO3−, but its movement is hindered by solvophobic attractions. The outcomes will aid applications, including electrochemical devices, catalysts, and lubricants.

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Unusual ion transport behaviour of ethylammonium nitrate mixed with lithium nitrate

Cited by 5 publications

References 48 publications

Temperature-Dependent Constrained Diffusion of Micro-Confined Alkylimidazolium Chloride Ionic Liquids

Temperature-Dependent Constrained Diffusion of Micro-Confined Alkylimidazolium Chloride Ionic Liquids

Physical and electrochemical properties of new structurally flexible imidazolium phosphate ionic liquids

Effect of Potential on the Nanostructure Dynamics of Ethylammonium Nitrate at a Graphite Electrode

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