Micelle formation in ethylammonium nitrate, a low-melting fused salt

“…From the viewpoint of physico-chemical properties of EAN as liquid and/or solvent, its conductivity [15][16][17][18]21], viscosity [18,19], density [18,20,21] and phase transitions [18,21] have been reported. In addition, the acid-base property was discussed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Liquid Structure and the Ion-Ion Interactions of Ethylammonium Nitrate Ionic Liquid Studied by Large Angle X-Ray Scattering and Molecular Dynamics Simulations

Umebayashi

Chung

Mitsugi

et al. 2008

J. Comput. Chem. Jpn.

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Room temperature ionic liquids (RTILs) are useful as new solvents or materials owing to their favorable properties such as negligible vapor pressure, non-flammability, and wide electrochemical window. For further development of new RTILs, it is indispensable to understand macroscopic properties as solvent and/or liquids of RTILs at a molecular or atomistic level. Here, liquid structure and the ion-ion interactions of room temperature ionic liquid ethylammonium nitrate (EAN) were studied by means of large angle X-ray scattering (LAXS) experiment and molecular dynamics simulations. X-ray interference function for EAN shows a small peak of 0.62Å -1 indicating nano-scale segregation in the ionic liquid. X-ray radial distribution function as the form of D(r) -4πr 2 ρ 0 evidently shows a peak of 3.4 and broad ones of 4.7, 8 and 12Å, suggesting that EAN has long range ordering in the liquid state. The intra-molecular X-ray interference function was estimated on the basis of molecular geometries found in crystals to yield the inter-molecular X-ray pair correlation function G LAXS inter (r). In G LAXS inter (r), peaks of 3.0, 3.4, and 4.7Å were found as the atom-atom correlation. The peak of 3.0Å can be assigned to the atom-atom correlation of N (C 2 H 5 NH 3 + ) O (NO 3 -) in the NH O hydrogen bonding. In addition, the peak of 3.4Å is also ascribable to C (C 2 H 5 NH 3 + ) O (NO 3 -) correlations in the CH O interactions. Molecular dynamics simulations based on newly developed force fields to describe a series of primary ammonium cation were performed to ascribe the peaks found in G LAXS inter (r). The X-ray interference function i MD (s) and the pair correlation function G MD (r) derived from simulations were reasonably in agreement with the experimental ones. According to the partial atom-atom correlation functions derived from the simulations, the experimentally observed peaks of 3.0 and 3.4Å can be ascribable to the NH O and the CH O correlations in the closest ethylammonium and nitrate interaction, respectively. The CH O interactions may play an important role in macroscopic properties of this kind of ionic liquids.

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“…As a matter of principle, solvents that promote the ability of amphiphiles to form micelles should exhibit a high dielectric constant, a high solvating power and should be highly structured (Lattes & Rico 1989). Micelle formation of alkyltrimethylammonium bromides, alkylpyridinium bromides and octylphenol ethoxylate (TX-100) in EAN was first reported almost 30 years ago (Evans et al, 1982;. In addition to micellar structures in binary IL/EAN mixtures, liquid crystals of lipids in EAN have been found (Evans et al, 1983 b).…”

Section: Ionic Liquids In Nonaqueous Microemulsionsmentioning

confidence: 99%

“…The critical micelle concentration (cmc) is significantly higher in ILs compared to water. For example Evans et al found that the cmc of conventional surfactants in EAN is between 5 and 10 times higher compared to water (Evans et al, 1982). Greaves et al studied the self-assembly behavior of amphiphiles in 22 different protic ILs (Greaves et al, 2008 b), fourteen of those were found to promote self-assembly of amphiphiles.…”

Section: Ionic Liquids In Nonaqueous Microemulsionsmentioning

confidence: 99%

Nonaqueous Microemulsions Containing Ionic Liquids – Properties and Applications

Zech¹,

Harrar²,

Kunz³

2011

Ionic Liquids: Theory, Properties, New Approaches

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Micelle formation in ethylammonium nitrate, a low-melting fused salt

Cited by 326 publications

References 15 publications

Ionic Liquids in Microemulsions—A Concept To Extend the Conventional Thermal Stability Range of Microemulsions

Ionic Liquids in Microemulsions—A Concept To Extend the Conventional Thermal Stability Range of Microemulsions

Liquid Structure and the Ion-Ion Interactions of Ethylammonium Nitrate Ionic Liquid Studied by Large Angle X-Ray Scattering and Molecular Dynamics Simulations

Nonaqueous Microemulsions Containing Ionic Liquids – Properties and Applications

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