Cargando…
Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange
Magnetic properties of three variants of MOF-76(Gd), {[Gd(BTC)(H(2)O)]·G}(n) (BTC = benzene-1,3,5-tricarboxylate, G = guest molecules) were investigated by static susceptibility, isothermal magnetization and specific heat capacity measurements. In the study we used as synthesized MOF-76(Gd)-DMF (1)...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6821888/ https://www.ncbi.nlm.nih.gov/pubmed/31666558 http://dx.doi.org/10.1038/s41598-019-51590-2 |
_version_ | 1783464225697431552 |
---|---|
author | Zeleňák, Vladimír Almáši, Miroslav Zeleňáková, Adriána Hrubovčák, Pavol Tarasenko, Róbert Bourelly, Sandrine Llewellyn, Philip |
author_facet | Zeleňák, Vladimír Almáši, Miroslav Zeleňáková, Adriána Hrubovčák, Pavol Tarasenko, Róbert Bourelly, Sandrine Llewellyn, Philip |
author_sort | Zeleňák, Vladimír |
collection | PubMed |
description | Magnetic properties of three variants of MOF-76(Gd), {[Gd(BTC)(H(2)O)]·G}(n) (BTC = benzene-1,3,5-tricarboxylate, G = guest molecules) were investigated by static susceptibility, isothermal magnetization and specific heat capacity measurements. In the study we used as synthesized MOF-76(Gd)-DMF (1) (G = DMF = dimethylformamide), containing DMF molecules in the cavity system, compound MOF-76(Gd) (2), activated complex without solvents in the cavities and water exchanged sample MOF-76(Gd)-H(2)O (3). A pronounced change in the magnetic entropy was found near the critical temperature for all three compounds. It was shown, that magnetic entropy change depends on the solvatation of the MOF. The highest value entropy change, ΔS(Mpk)(T) was observed for compound 2 (ΔS(Mpk)(T) = 42 J kg(−1) K(−1) at 1.8 K for ΔH = 5 T). The ΔS(Mpk)(T) for the compounds 1, 2 and 3 reached 81.8, 88.4 and 100% of the theoretical values, respectively. This suggests that in compound 3 Gd(3+)···Gd(3+) antiferromagnetic interactions are decoupled gradually, and higher fields promote a larger decoupling between the individual spin centers. The observed entropy changes of compounds were comparable with other magnetic refrigerants proposed for low-temperature applications. To study the magnetothermal effect of 2 (the sample with largest −ΔS(Mpk)), the temperature-dependent heat capacities (C) at different fields were measured. The value of magnetic entropy S obtained from heat capacities (39.5 J kg(−1) K(−1) at 1.8 K for an applied magnetic field change of 5 T) was in good agreement with that derived from the magnetization data (42 J kg(−1) K(−1) at 1.8 K). |
format | Online Article Text |
id | pubmed-6821888 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-68218882019-11-05 Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange Zeleňák, Vladimír Almáši, Miroslav Zeleňáková, Adriána Hrubovčák, Pavol Tarasenko, Róbert Bourelly, Sandrine Llewellyn, Philip Sci Rep Article Magnetic properties of three variants of MOF-76(Gd), {[Gd(BTC)(H(2)O)]·G}(n) (BTC = benzene-1,3,5-tricarboxylate, G = guest molecules) were investigated by static susceptibility, isothermal magnetization and specific heat capacity measurements. In the study we used as synthesized MOF-76(Gd)-DMF (1) (G = DMF = dimethylformamide), containing DMF molecules in the cavity system, compound MOF-76(Gd) (2), activated complex without solvents in the cavities and water exchanged sample MOF-76(Gd)-H(2)O (3). A pronounced change in the magnetic entropy was found near the critical temperature for all three compounds. It was shown, that magnetic entropy change depends on the solvatation of the MOF. The highest value entropy change, ΔS(Mpk)(T) was observed for compound 2 (ΔS(Mpk)(T) = 42 J kg(−1) K(−1) at 1.8 K for ΔH = 5 T). The ΔS(Mpk)(T) for the compounds 1, 2 and 3 reached 81.8, 88.4 and 100% of the theoretical values, respectively. This suggests that in compound 3 Gd(3+)···Gd(3+) antiferromagnetic interactions are decoupled gradually, and higher fields promote a larger decoupling between the individual spin centers. The observed entropy changes of compounds were comparable with other magnetic refrigerants proposed for low-temperature applications. To study the magnetothermal effect of 2 (the sample with largest −ΔS(Mpk)), the temperature-dependent heat capacities (C) at different fields were measured. The value of magnetic entropy S obtained from heat capacities (39.5 J kg(−1) K(−1) at 1.8 K for an applied magnetic field change of 5 T) was in good agreement with that derived from the magnetization data (42 J kg(−1) K(−1) at 1.8 K). Nature Publishing Group UK 2019-10-30 /pmc/articles/PMC6821888/ /pubmed/31666558 http://dx.doi.org/10.1038/s41598-019-51590-2 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Zeleňák, Vladimír Almáši, Miroslav Zeleňáková, Adriána Hrubovčák, Pavol Tarasenko, Róbert Bourelly, Sandrine Llewellyn, Philip Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange |
title | Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange |
title_full | Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange |
title_fullStr | Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange |
title_full_unstemmed | Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange |
title_short | Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange |
title_sort | large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6821888/ https://www.ncbi.nlm.nih.gov/pubmed/31666558 http://dx.doi.org/10.1038/s41598-019-51590-2 |
work_keys_str_mv | AT zelenakvladimir largeandtunablemagnetocaloriceffectingadoliniumorganicframeworktuningbysolventexchange AT almasimiroslav largeandtunablemagnetocaloriceffectingadoliniumorganicframeworktuningbysolventexchange AT zelenakovaadriana largeandtunablemagnetocaloriceffectingadoliniumorganicframeworktuningbysolventexchange AT hrubovcakpavol largeandtunablemagnetocaloriceffectingadoliniumorganicframeworktuningbysolventexchange AT tarasenkorobert largeandtunablemagnetocaloriceffectingadoliniumorganicframeworktuningbysolventexchange AT bourellysandrine largeandtunablemagnetocaloriceffectingadoliniumorganicframeworktuningbysolventexchange AT llewellynphilip largeandtunablemagnetocaloriceffectingadoliniumorganicframeworktuningbysolventexchange |