Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates

Филиппов, А. В.; Гнездилов, О. И.; Hjalmarsson, Nicklas; Antzutkin, Oleg N.; Glavatskih, Sergei; Furó, István; Rutland, Mark W.

doi:10.1039/c7cp01772c

Cited by 31 publications

(38 citation statements)

References 38 publications

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“…The confined IL samples were prepared with glass plates settled in a stack. 19,25,26 The plates measuring 14 Â 2.5 Â 0.1 mm (Thermo Scientific Menzel-Gläser, Menzel GmbH, Germany) were used in all the experiments. For one experiment, the plates were thoroughly cleaned using detergent solution and distilled water before sample preparation.…”

Section: Sample Preparationmentioning

confidence: 99%

“…More details on this type of glass plates can be found in our previous publications. 19,25,26 For another experiment, the glass plates were placed in 4 wt% hydrofluoric acid (HF) aqueous solution for 40 minutes. After that, the HF treated glass plates were cleaned in the same manner as the untreated plates and referred to as ''HF treated glass plates'' in this work.…”

Section: Sample Preparationmentioning

confidence: 99%

“…13,15 Both the diffusivity of ions and the relaxation are coupled with viscosity. 13,15 Confined ILs [19][20][21][22] have been the research focus for the last few years. The diffusivity of ILs confined in aligned carbon nanotubes, 23 mesoporous carbon 24 and silicon 21,22 increases by a factor of 2-3 or even more compared with the diffusivities of ions in the bulk ILs.…”

Section: Introductionmentioning

confidence: 99%

“…Enhanced diffusion of ethylammonium cations has been observed for ethylammonium nitrate confined between polar glass plates. 19 Recently, the effects of a strong external magnetic field on both the diffusivity and NMR relaxation of confined alkylammonium nitrates have been thoroughly studied. 25,26 Among the advantages of ionic liquids over molecular liquids are their chemical stability and negligible volatility.…”

Section: Introductionmentioning

confidence: 99%

“…35 Using flat parallel plates as a confinement has certain advantages from a point of view of NMR measurements, because such a geometry allows an almost complete compensation of the background gradient. 19 Therefore, undistorted NMR spectra and data on molecular and/or ionic dynamics can be obtained using parallel plates. In this work, we investigated the effect of confinement on the dynamics and stability of the most commonly studied ionic liquid [EMIM][OAc] confined between flat and parallel polar glass plates.…”

Section: Introductionmentioning

confidence: 99%

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Rapid carbene formation increases ion diffusivity in an imidazolium acetate ionic liquid confined between polar glass plates

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Antzutkin

Shah

2019

Phys. Chem. Chem. Phys.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rapid carbene formation increases ion diffusivity in an imidazolium acetate ionic liquid confined between polar glass plates

Филиппов

Antzutkin

Shah

2019

Phys. Chem. Chem. Phys.

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Friction of Ionic Liquid–Glycol Ether Mixtures at Titanium Interfaces: Negative Load Dependence

Zhou

Zhu

et al. 2018

Adv Materials Inter

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Our atomic force microscopy (AFM) experiments and non-equilibrium molecular dynamics (NEMD) simulations have demonstrated a negative friction-load dependence to ionic liquid-glycol ether mixtures, that is, the friction decreases as the normal load increases. NEMD simulations revealed a structural reorientation of the studied ionic liquid (IL): as the normal load increases, the cation alkyl chains of ILs change the orientation to preferentially parallel to the tip scanning path. The flat-oriented IL structures, similar to the 'blooming lotus leaf', produce a new sliding interface and reduce the friction. A further molecular dynamics simulation was carried out by adopting slit pore models to mimic the tip approaching process to confirm the dynamics of ILs. We observed a faster diffusion of ILs in the smaller slit pore. The faster diffusion of ILs in the more confined slit pore, facilitates the structural reorientation of ILs. The resulted new sliding surface is responsible for the observed smaller friction at higher loads, also known as the negative friction-load dependence.These findings provide a fundamental explanation to the role of ILs in interfacial lubrications. They help to understand liquid flow properties under confinement, with implications for the development of better nanofluidic devices.

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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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Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates

Abstract: Diffusion of EAN confined between polar glass plates separated by a few micrometers is higher by a factor of ca. 2 as compared to bulk values. Formation of a new phase, different to the bulk, was suggested.

Cited by 31 publications

References 38 publications

Rapid carbene formation increases ion diffusivity in an imidazolium acetate ionic liquid confined between polar glass plates

Rapid carbene formation increases ion diffusivity in an imidazolium acetate ionic liquid confined between polar glass plates

Friction of Ionic Liquid–Glycol Ether Mixtures at Titanium Interfaces: Negative Load Dependence

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

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