Wachter, Philipp and Schreiner, Christian and Schweiger, Flans-Georg and Gores, Heiner Jakob (2010) Determination of phase transition points of ionic liquids by combination of thermal analysis and conductivity measurements at very low heating and cooling rates. JOURNAL OF CHEMICAL THERMODYNAMICS, 42 (7). pp. 900-903. ISSN 0021-9614, 1096-3626
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The determination of phase transition points of nine different ionic liquids (ILs) was performed by thermal analysis with simultaneous recording of conductivity. Conductivity of electrolyte solutions and ILs drastically changes during phase transitions and thus is an additional and very sensitive indicator for measuring phase transition points. Evaluation of temperature-time functions and conductivity-time functions with our computer-coupled automated equipment enabled the determination of melting temperatures with high accuracy and reliability. This claim is based on large samples, low temperature change rates and by regularly repeated measurements, i.e. at least seven measurements per IL The melting temperatures of 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate, 1-butyl-1-methylpyrrolidinium tris(penta-fluoroethyl)trifluorophosphate, and 1-methyl-3-propylimidazolium iodide were, to our knowledge, determined for the first time. The melting temperatures of the other 1-butyl-1-methylpyrrolidinium-, 1-ethyl-3-methylimidazolium-, 1-hexyl-3-methylimidazolium-, and trimethylsulfonium-based ILs showed either a very good accordance with values published in literature or were distinctly higher. (c) 2010 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TEMPERATURE MOLTEN-SALTS; ALKYL-CHAIN-LENGTH; THERMODYNAMIC PROPERTIES; DIFFUSION-COEFFICIENT; IMIDAZOLIUM CATION; MELTING-POINTS; SOLAR-CELLS; FAMILY; ELECTROLYTES; VISCOSITY; Phase transition points; Ionic liquids; Conductivity; Dye-sensitized solar cells; Lithium-ion cells |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Heiner Jakob Gores |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Jul 2020 10:39 |
| Last Modified: | 27 Jul 2020 10:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24511 |
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