An NMR Spin-Echo Study of Diffusion in a Room-Temperature Molten Salt

Pressure-dependent measurements of self-diffusion in the room-temperature molten salt (RTMS) N,N-butylmethylimidazoliumhexafluorophosphate were carried out at 298 and 308 K. The pressure range lied between ambient pressure and 300 MPa. In addition, methanolic solutions of this RTMS were investigated at ambient pressure. The self-diffusion coefficients of both components are reported as functions of concentration and temperature in the range 293 - 313 K. A modified version of a recently published high-pressure probe is described.

Download Full-text

A NMR Spin-Echo Study of Diffusion in Molten Salts

Zeitschrift für Naturforschung A ◽

10.1515/zna-2004-1-207 ◽

2004 ◽

Vol 59 (1-2) ◽

pp. 51-58 ◽

Cited By ~ 2

Author(s):

Günter Palmer ◽

Joachim Richter ◽

Manfred D. Zeidler

Keyword(s):

High Pressure ◽

Titanium Alloy ◽

Diffusion Coefficients ◽

High Frequency ◽

Molten Salts ◽

Pressure Range ◽

Spin Echo ◽

Ambient Pressure ◽

Pressure Probe ◽

Self Diffusion

Pressure-dependent measurements of the cationic self-diffusion coefficients of molten (Na, Li)NO3 were carried out at 613 K. The pressure range lies between ambient pressure and 200 MPa. A new high-pressure probe, operating with heating coils, was constructed from titanium alloy. The temperature difference across the probe could be confined to 2.5 K. By use of a switchable high-frequency coil the nuclei lithium and sodium could be measured in succession within the same sample. The activation volumes are composition-dependent and range from 5 to 9 cm3mol−1.

Download Full-text

Solvate Ionic Liquids and Their Application to Lithium Batteries: Glyme-Lithium Bis(fluorosulfonyl)amide Equimolar Complexes

MRS Proceedings ◽

10.1557/opl.2012.1517 ◽

2012 ◽

Vol 1473 ◽

Cited By ~ 2

Author(s):

Kazuki Yoshida ◽

Mizuho Tsuchiya ◽

Naoki Tachikawa ◽

Kaoru Dokko ◽

Masayoshi Watanabe

Keyword(s):

Nuclear Magnetic Resonance ◽

Lithium Batteries ◽

Diffusion Coefficients ◽

Room Temperature ◽

Spin Echo ◽

The Self ◽

Resonance Spectroscopy ◽

Lithium Secondary Battery ◽

Self Diffusion ◽

Secondary Battery

ABSTRACTThe physicochemical properties of glyme-Li[FSA] (FSA: bis(fluorosulfonyl)amide) equimolar complexes were investigated. The self-diffusion coefficients of glymes and Li+ as determined by pulsed-field gradient spin-echo nuclear magnetic resonance spectroscopy in equimolar complexes were almost identical, suggesting that all of the glyme molecules coordinated with Li+. Electrochemical characterization revealed that the oxidative stability of glyme molecules was enhanced by complexing with Li+. Using [Li(glyme)1][FSA] electrolytes and a LiFePO4cathode, a lithium secondary battery could be stably operated for more than 100 cycles at room temperature.

Download Full-text

Self-Diffusion in Molten Lithium Nitrate

Zeitschrift für Naturforschung A ◽

10.1515/zna-1992-1007 ◽

1992 ◽

Vol 47 (10) ◽

pp. 1047-1050 ◽

Cited By ~ 2

Author(s):

C. Herdlicka ◽

J. Richter ◽

M. D. Zeidler

Keyword(s):

Diffusion Coefficient ◽

Diffusion Coefficients ◽

Spin Echo ◽

The Self ◽

Lithium Nitrate ◽

Equimolar Ratio ◽

Self Diffusion ◽

Field Gradients ◽

Molten Lithium ◽

Self Diffusion Coefficient

AbstractSelf-diffusion coefficients of 7Li+ ions have been measured in molten LiNO3 with several compositions of 6Li+ and 7Li+ over a temperature range from 537 to 615 K. The NMR spin-echo method with pulsed field gradients was applied. It was found that the self-diffusion coefficient depends on the isotopic composition and shows a maximum at equimolar ratio. At temperatures above 600 K this behaviour disappears.

Download Full-text

Diffusionskonstanten einiger organischer Flüssigkeiten

Zeitschrift für Naturforschung A ◽

10.1515/zna-1970-0535 ◽

1970 ◽

Vol 25 (5) ◽

pp. 777-780 ◽

Cited By ~ 1

Author(s):

Gottfried J. Krüger ◽

Rene Weiss

Keyword(s):

Nuclear Magnetic Resonance ◽

Acetic Acid ◽

Magnetic Resonance ◽

Diffusion Coefficients ◽

Spin Echo ◽

The Self ◽

Self Diffusion ◽

Resonance Spin ◽

Nuclear Magnetic

The self diffusion coefficients of acetone, ethanol, diethoxymethane, diethylether, diglycole-dimethylether, 1,2-dimethoxyethane, acetic acid, methyliodide, tetrahydrofuran, toluene, trimethylphosphite, and 1,3,5-trifluorobenzene have been measured in dependence on temperature using nuclear magnetic resonance spin echo techniques.

Download Full-text

Seif Diffusion of Liquid 6Li and 7Li as Measured by Nuclear Magnetic Resonance

Zeitschrift für Naturforschung A ◽

10.1515/zna-1971-0118 ◽

1971 ◽

Vol 26 (1) ◽

pp. 94-98 ◽

Cited By ~ 16

Author(s):

G. J. Krüger ◽

W. Müller-Warmuth ◽

A. Klemm

Keyword(s):

Nuclear Magnetic Resonance ◽

Magnetic Resonance ◽

Diffusion Coefficients ◽

Spin Echo ◽

Absolute Measurement ◽

The Self ◽

Square Root ◽

Mass Ratio ◽

Experimental Procedure ◽

Self Diffusion

Abstract The self-diffusion coefficients of liquid 6Li and 7Li have been measured using NMR spin echo techniques with pulsed gradients. In the experimental procedure, and in the sample preparation, particular attention has been paid to a relative, rather than to an absolute measurement. At 190 °C, the ratio of the self-diffusion coefficients is found to be D6 (x6 = 1) / D7 (x7 = 1) = 1.09 ± 0.06, in agreement with the square root of the mass ratio (m7-m6)1/2 = 1.08. In an atomic mixture of 80% 6Li and 20% 7Li, D6 (x6 = 0.8)/D7 (x6 = 0.8) = 1.0 3 ± 0.08 has been obtained

Download Full-text

Some Properties of Molten KCl at High Density Studied by MD Simulation

Zeitschrift für Naturforschung A ◽

10.1515/zna-1981-1015 ◽

1981 ◽

Vol 36 (10) ◽

pp. 1106-1111 ◽

Cited By ~ 5

Author(s):

Ryuzo Takagi ◽

Isao Okada ◽

Kazutaka Kawamura

Keyword(s):

Molecular Dynamics ◽

Monte Carlo ◽

Thermodynamic Properties ◽

Diffusion Coefficients ◽

Md Simulation ◽

Ambient Pressure ◽

The Self ◽

Self Diffusion ◽

Dynamics Simulations ◽

Good Agreement

Molecular dynamics simulations of molten KCl have been performed at 1173 K with the molar volumes of 52.0 (the value under ambient pressure), 50.0, 48.0 and 45.0 cm3 mol-1 . Some thermodynamic properties at higher densities have been evaluated, which are generally in good agreement with the experimentally obtained ones and Monte Carlo results. Both at normal and higher densities, the self-exchange velocities of neighbouring unlike ions (SEV) are found to be proportional to the internal mobilities with nearly the same constant as derived previously for molten LiCl, RbCl and their 1 : 1 mixture. Calculated transport properties such as the SEV and the self-diffusion coefficients considerably decrease with increasing density, while the configuration does not change much.

Download Full-text

Self-Diffusion Coefficients, Aggregation Numbers and the Range of Existence of Spherical Micelles of Oxyethylated Alkylphenols

Applied Magnetic Resonance ◽

10.1007/s00723-021-01323-4 ◽

2021 ◽

Author(s):

Victor P. Arkhipov ◽

Natalia A. Kuzina ◽

Andrei Filippov

Keyword(s):

Aqueous Solutions ◽

Diffusion Coefficients ◽

The Self ◽

Self Diffusion ◽

Aggregation Numbers ◽

Temperature Ranges ◽

Spherical Micelles ◽

Limiting Values

AbstractAggregation numbers were calculated based on measurements of the self-diffusion coefficients, the effective hydrodynamic radii of micelles and aggregates of oxyethylated alkylphenols in aqueous solutions. On the assumption that the radii of spherical micelles are equal to the lengths of fully extended neonol molecules, the limiting values of aggregation numbers corresponding to spherically shaped neonol micelles were calculated. The concentration and temperature ranges under which spherical micelles of neonols are formed were determined.

Download Full-text