Grant Agency of the Czech Republic [17-08218S]

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Grant Agency of the Czech Republic [17-08218S]

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Publications

Heat capacity of 1-hexadecyl-3-methylimidazolium based ionic liquids in solid and liquid phase

Bendova, Magdalena; Wagner, Zdenek; Bogdanov, Milen G.; Čanji, Maja; Zdolšek, Nikola

(2020)

TY  - JOUR
AU  - Bendova, Magdalena
AU  - Wagner, Zdenek
AU  - Bogdanov, Milen G.
AU  - Čanji, Maja
AU  - Zdolšek, Nikola
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8859
AB  - In this work, two ionic liquids with a 1-hexadecyl-3-methylimidazolium cation were synthesized with different anions; chloride and saccharinate, respectively, both of them showing melting points above room temperature, ranging between (324.15 and 338.15) K and enthalpies of fusion close to or higher than 100 J/g, making them potentially suitable phase-change materials (PCMs) for latent heat storage. This application potential can be enhanced by a suitably large heat capacity and thermal conductivity of the material both in the liquid and solid phase. Heat capacity was therefore measured in this work as a function of temperature using the differential scanning calorimetry (DSC) to determine how it is affected by the anion structure. Care has been taken to evaluate the influence of the phase change on the measured data. The experimental data have then been analyzed by means of methods based on mathematical gnostics (MG). As a non-statistical approach towards data uncertainty, MG enabled us to analyze the underlying phenomena that affect the value of the experimental heat capacity. © 2020 Elsevier B.V.
T2  - Journal of Molecular Liquids
T1  - Heat capacity of 1-hexadecyl-3-methylimidazolium based ionic liquids in solid and liquid phase
VL  - 305
SP  - 112847
DO  - 10.1016/j.molliq.2020.112847
ER  - 
@article{
author = "Bendova, Magdalena and Wagner, Zdenek and Bogdanov, Milen G. and Čanji, Maja and Zdolšek, Nikola",
year = "2020",
abstract = "In this work, two ionic liquids with a 1-hexadecyl-3-methylimidazolium cation were synthesized with different anions; chloride and saccharinate, respectively, both of them showing melting points above room temperature, ranging between (324.15 and 338.15) K and enthalpies of fusion close to or higher than 100 J/g, making them potentially suitable phase-change materials (PCMs) for latent heat storage. This application potential can be enhanced by a suitably large heat capacity and thermal conductivity of the material both in the liquid and solid phase. Heat capacity was therefore measured in this work as a function of temperature using the differential scanning calorimetry (DSC) to determine how it is affected by the anion structure. Care has been taken to evaluate the influence of the phase change on the measured data. The experimental data have then been analyzed by means of methods based on mathematical gnostics (MG). As a non-statistical approach towards data uncertainty, MG enabled us to analyze the underlying phenomena that affect the value of the experimental heat capacity. © 2020 Elsevier B.V.",
journal = "Journal of Molecular Liquids",
title = "Heat capacity of 1-hexadecyl-3-methylimidazolium based ionic liquids in solid and liquid phase",
volume = "305",
pages = "112847",
doi = "10.1016/j.molliq.2020.112847"
}
Bendova, M., Wagner, Z., Bogdanov, M. G., Čanji, M.,& Zdolšek, N.. (2020). Heat capacity of 1-hexadecyl-3-methylimidazolium based ionic liquids in solid and liquid phase. in Journal of Molecular Liquids, 305, 112847.
https://doi.org/10.1016/j.molliq.2020.112847
Bendova M, Wagner Z, Bogdanov MG, Čanji M, Zdolšek N. Heat capacity of 1-hexadecyl-3-methylimidazolium based ionic liquids in solid and liquid phase. in Journal of Molecular Liquids. 2020;305:112847.
doi:10.1016/j.molliq.2020.112847 .
Bendova, Magdalena, Wagner, Zdenek, Bogdanov, Milen G., Čanji, Maja, Zdolšek, Nikola, "Heat capacity of 1-hexadecyl-3-methylimidazolium based ionic liquids in solid and liquid phase" in Journal of Molecular Liquids, 305 (2020):112847,
https://doi.org/10.1016/j.molliq.2020.112847 . .
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Phase transitions in higher-melting imidazolium-based ionic liquids: Experiments and advanced data analysis

Čanji, Maja; Bendova, Magdalena; Bogdanov, Milen G.; Wagner, Zdenek; Zdolšek, Nikola; Quirion, François; Jandová, Věra; Vrbka, Pavel

(2019)

TY  - JOUR
AU  - Čanji, Maja
AU  - Bendova, Magdalena
AU  - Bogdanov, Milen G.
AU  - Wagner, Zdenek
AU  - Zdolšek, Nikola
AU  - Quirion, François
AU  - Jandová, Věra
AU  - Vrbka, Pavel
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8423
AB  - 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. © 2019 Elsevier B.V.
T2  - Journal of Molecular Liquids
T1  - Phase transitions in higher-melting imidazolium-based ionic liquids: Experiments and advanced data analysis
VL  - 292
SP  - 111222
DO  - 10.1016/j.molliq.2019.111222
ER  - 
@article{
author = "Čanji, Maja and Bendova, Magdalena and Bogdanov, Milen G. and Wagner, Zdenek and Zdolšek, Nikola and Quirion, François and Jandová, Věra and Vrbka, Pavel",
year = "2019",
abstract = "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. © 2019 Elsevier B.V.",
journal = "Journal of Molecular Liquids",
title = "Phase transitions in higher-melting imidazolium-based ionic liquids: Experiments and advanced data analysis",
volume = "292",
pages = "111222",
doi = "10.1016/j.molliq.2019.111222"
}
Čanji, M., Bendova, M., Bogdanov, M. G., Wagner, Z., Zdolšek, N., Quirion, F., Jandová, V.,& Vrbka, P.. (2019). Phase transitions in higher-melting imidazolium-based ionic liquids: Experiments and advanced data analysis. in Journal of Molecular Liquids, 292, 111222.
https://doi.org/10.1016/j.molliq.2019.111222
Čanji M, Bendova M, Bogdanov MG, Wagner Z, Zdolšek N, Quirion F, Jandová V, Vrbka P. Phase transitions in higher-melting imidazolium-based ionic liquids: Experiments and advanced data analysis. in Journal of Molecular Liquids. 2019;292:111222.
doi:10.1016/j.molliq.2019.111222 .
Čanji, Maja, Bendova, Magdalena, Bogdanov, Milen G., Wagner, Zdenek, Zdolšek, Nikola, Quirion, François, Jandová, Věra, Vrbka, Pavel, "Phase transitions in higher-melting imidazolium-based ionic liquids: Experiments and advanced data analysis" in Journal of Molecular Liquids, 292 (2019):111222,
https://doi.org/10.1016/j.molliq.2019.111222 . .
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