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Phase transitions in higher-melting ionic liquids: thermal storage materials or liquid crystals?
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SYSNO ASEP 0523663 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Phase transitions in higher-melting ionic liquids: thermal storage materials or liquid crystals? Author(s) Bendová, Magdalena (UCHP-M) RID, ORCID, SAI
Čanji, Maja (UCHP-M) RID, SAI
Bogdanov, M.G. (BG)
Wagner, Zdeněk (UCHP-M) RID, SAI, ORCID
Zdolšek, N. (RS)
Quirion, F. (FR)Source Title CHEMICAL ENGINEERING TRANSACTIONS, Volume 69. - Milano : AIDIC Servizi S.r.l., 2018 / Brunazzi E. ; Sorensen E. - ISSN 2283-9216 - ISBN 978-88-95608-66-2 Pages s. 37-42 Number of pages 6 s. Publication form Online - E Action International Conference on Distillation and Absorption /11./ Event date 16.09.2018 - 19.09.2018 VEvent location Florence Country IT - Italy Event type EUR Language eng - English Country IT - Italy Keywords chlorine compounds ; differential scanning calorimetry ; enthalpy Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA17-08218S GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 EID SCOPUS 85054697195 DOI 10.3303/CET1869007 Annotation To assess the application potential of a material in thermal energy storage, the knowledge of their thermophysical properties is of key importance. Specifically, an efficient material has to show, among others, large enthalpies of phase change and a sufficiently large thermal conductivity. In this work, imidazolium-based ionic liquids (ILs) with long alkyl chain substituents 1-hexadecyl-3-methylimidazolium chloride and 1-hexadecyl-3-methylimidazolium saccharinate were studied in view of their possible use as phase-change materials. Differential scanning calorimetry (DSC) and the heat-leak modulus methods were used to determine the temperatures and the enthalpies of phase transitions in the studied ILs, enabling us to study the influence of the heating rates on the measured properties. Enthalpies of fusion near to or larger than 100 J·g-1 were found in the studied ionic liquids, making them promising candidates for thermal energy storage. Furthermore, peaks corresponding to possible liquid crystalline phases in the DSC traces of 1-hexadecyl-3-methylimidazolium saccharinate were observed. The measured properties are not only essential characteristics of a thermal storage material, temperatures and enthalpies of melting are necessary in thermodynamic description and modelling of solid-liquid phase behavior and thus in the possible utilization of the material in separation and crystallization processes. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2020 Electronic address https://www.aidic.it/cet/18/69/007.pdf
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