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Phase Transitions in Higher-melting Imidazolium-based Ionic Liquids: Experiments and Advanced Data Analysis.
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SYSNO ASEP 0507799 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Phase Transitions in Higher-melting Imidazolium-based Ionic Liquids: Experiments and Advanced Data Analysis. Author(s) Čanji, Maja (UCHP-M) RID, SAI
Bendová, Magdalena (UCHP-M) RID, ORCID, SAI
Bogdanov, M.G. (BG)
Wagner, Zdeněk (UCHP-M) RID, SAI, ORCID
Zdolšek, N. (RS)
Quirion, F. (FR)
Jandová, Věra (UCHP-M) RID, ORCID, SAI
Vrbka, P. (CZ)Article number 111222 Source Title Journal of Molecular Liquids. - : Elsevier - ISSN 0167-7322
Roč. 292, OCT 15 (2019)Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords ionic liquids ; phase change materials ; liquid crystals Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA17-08218S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UCHP-M - RVO:67985858 UT WOS 000488658900011 EID SCOPUS 85069704013 DOI 10.1016/j.molliq.2019.111222 Annotation As thermal energy storage becomes an increasingly important topic, good knowledge of properties of phase-change materials (PCM) is essential. Among other properties, a good PCM should show a large enthalpy of melting, reproducible melting/solidification cycles, and long-term thermal stability. Temperatures and enthalpies of fusion should be determined at a possibly large range of conditions to allow for a critical evaluation of the experimental data and assessment of the material application potential. In this work, imidazolium-based ionic liquids (ILs) with long alkyl chain substituents 1-hexadecyl-3-methylimidazolium chloride and 1-hexadecyl-3-methyl-imidazolium saccharinate were studied in view of their possible use as phase-change materials. Differential scanning calorimetry (DSC) and the heat-leak modulus (HLM) 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 and cooling 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. Peaks corresponding to possible liquid crystalline phases in the DSC traces of 1-hexadecyl-3-methylimidazolium saccharinate were observed, pointing to more complex phase behaviour of the studied ionic liquids. Finally, to critically evaluate the experimental data measured in this work, methods based on mathematical gnostics were used. Repeatability of measurements and the degree of mutual agreement between the methods used in this work could thus be determined.
Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0300801
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