2026-04-27T12:58:54Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/691302025-02-21T10:31:34Zcom_10324_1157com_10324_931com_10324_894col_10324_1298

Lozano Martín, Daniel Inês Cardoso Vieira, Salomé Paredes Mendez, Xavier Vitoriano Lourenço, Maria José Nieto de Castro, Carlos A. Sengers, Jan V. Massonne, Klemens 2024-07-25T11:04:06Z 2024-07-25T11:04:06Z 2020 Molecules, 2020, vol. 25, n. 18, p. 4290. https://uvadoc.uva.es/handle/10324/69130 10.3390/molecules25184290 4290 18 Molecules 25 1420-3049 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, [C2mim][CH3SO3], 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 (λ-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, Tmelt = 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. spa info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional Thermal Conductivity of Metastable Ionic Liquid [C2mim][CH3SO3] info:eu-repo/semantics/article