Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>]
Ionic liquids have been suggested as new engineering fluids, namely in the area of heat transfer, as alternatives to current biphenyl and diphenyl oxide, alkylated aromatics and dimethyl polysiloxane oils, which degrade above 200 °C and pose some environmental problems. Recently, we have proposed 1-...
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MDPI AG
2020-09-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/25/18/4290 |
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| author | Daniel Lozano-Martín Salomé Inês Cardoso Vieira Xavier Paredes Maria José Vitoriano Lourenço Carlos A. Nieto de Castro Jan V. Sengers Klemens Massonne |
| author_facet | Daniel Lozano-Martín Salomé Inês Cardoso Vieira Xavier Paredes Maria José Vitoriano Lourenço Carlos A. Nieto de Castro Jan V. Sengers Klemens Massonne |
| author_sort | Daniel Lozano-Martín |
| collection | DOAJ |
| description | Ionic liquids have been suggested as new engineering fluids, namely in the area of heat transfer, as alternatives to current biphenyl and diphenyl oxide, alkylated aromatics and dimethyl polysiloxane oils, which degrade above 200 °C and pose some environmental problems. Recently, we have proposed 1-ethyl-3-methylimidazolium methanesulfonate, [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>], as a new heat transfer fluid, because of its thermophysical and toxicological properties. However, there are some interesting points raised in this work, namely the possibility of the existence of liquid metastability below the melting point (303 K) or second order-disorder transitions (<i>λ</i>-type) before reaching the calorimetric freezing point. This paper analyses in more detail this zone of the phase diagram of the pure fluid, by reporting accurate thermal-conductivity measurements between 278 and 355 K with an estimated uncertainty of 2% at a 95% confidence level. A new value of the melting temperature is also reported, <i>T</i><sub>melt</sub> = 307.8 ± 1 K. Results obtained support liquid metastability behaviour in the solid-phase region and permit the use of this ionic liquid at a heat transfer fluid at temperatures below its melting point. Thermal conductivity models based on Bridgman theory and estimation formulas were also used in this work, failing to predict the experimental data within its uncertainty. |
| first_indexed | 2024-03-10T16:13:12Z |
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| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T16:13:12Z |
| publishDate | 2020-09-01 |
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| record_format | Article |
| series | Molecules |
| spelling | doaj.art-05a7dcd0683e4d62b8e236363fb6d9a42023-11-20T14:16:25ZengMDPI AGMolecules1420-30492020-09-012518429010.3390/molecules25184290Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>]Daniel Lozano-Martín0Salomé Inês Cardoso Vieira1Xavier Paredes2Maria José Vitoriano Lourenço3Carlos A. Nieto de Castro4Jan V. Sengers5Klemens Massonne6Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalCentro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalCentro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalCentro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalCentro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalInstitute for Physical Science and Technology, University of Maryland, College Park, MD 20742, USABASF SE, RC/OI—M300, 67056 Ludwigshafen, GermanyIonic liquids have been suggested as new engineering fluids, namely in the area of heat transfer, as alternatives to current biphenyl and diphenyl oxide, alkylated aromatics and dimethyl polysiloxane oils, which degrade above 200 °C and pose some environmental problems. Recently, we have proposed 1-ethyl-3-methylimidazolium methanesulfonate, [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>], as a new heat transfer fluid, because of its thermophysical and toxicological properties. However, there are some interesting points raised in this work, namely the possibility of the existence of liquid metastability below the melting point (303 K) or second order-disorder transitions (<i>λ</i>-type) before reaching the calorimetric freezing point. This paper analyses in more detail this zone of the phase diagram of the pure fluid, by reporting accurate thermal-conductivity measurements between 278 and 355 K with an estimated uncertainty of 2% at a 95% confidence level. A new value of the melting temperature is also reported, <i>T</i><sub>melt</sub> = 307.8 ± 1 K. Results obtained support liquid metastability behaviour in the solid-phase region and permit the use of this ionic liquid at a heat transfer fluid at temperatures below its melting point. Thermal conductivity models based on Bridgman theory and estimation formulas were also used in this work, failing to predict the experimental data within its uncertainty.https://www.mdpi.com/1420-3049/25/18/42901-Ethyl-3-methylimidazolium methanesulfonateBasionics<sup>®®</sup> ST35ECOENG™ 110melting pointthermal conductivitymetastable liquid |
| spellingShingle | Daniel Lozano-Martín Salomé Inês Cardoso Vieira Xavier Paredes Maria José Vitoriano Lourenço Carlos A. Nieto de Castro Jan V. Sengers Klemens Massonne Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>] Molecules 1-Ethyl-3-methylimidazolium methanesulfonate Basionics<sup>®®</sup> ST35 ECOENG™ 110 melting point thermal conductivity metastable liquid |
| title | Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>] |
| title_full | Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>] |
| title_fullStr | Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>] |
| title_full_unstemmed | Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>] |
| title_short | Thermal Conductivity of Metastable Ionic Liquid [C<sub>2</sub>mim][CH<sub>3</sub>SO<sub>3</sub>] |
| title_sort | thermal conductivity of metastable ionic liquid c sub 2 sub mim ch sub 3 sub so sub 3 sub |
| topic | 1-Ethyl-3-methylimidazolium methanesulfonate Basionics<sup>®®</sup> ST35 ECOENG™ 110 melting point thermal conductivity metastable liquid |
| url | https://www.mdpi.com/1420-3049/25/18/4290 |
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