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Solid-liquid phase diagram of the dimethyl + dipropyl adipates system: application to low-temperature thermal energy storage

2025-07-10Journal article Open access
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.sdg07:Energias Renováveis e Acessíveis
dc.contributor.authorSequeira, Maria Carolina
dc.contributor.authorNikitin, Timur
dc.contributor.authorCaetano, Fernando J. P.
dc.contributor.authorDiogo, Herminio
dc.contributor.authorFareleira, João
dc.contributor.authorFausto, Rui
dc.date.accessioned2026-01-07T18:03:49Z
dc.date.available2026-01-07T18:03:49Z
dc.date.issued2025-07-10
dc.description.abstractThe present study is the continuation of our research work on di-n-alkyl adipates and their potential as phase change materials (PCM) for low-temperature thermal energy storage (TES). The solid–liquid phase diagram for the binary system composed of dimethyl adipate (DMA) and dipropyl adipate (DPA) is presented and analysed. In a previous study, we explored a particular binary system of n-alkyl adipates, namely diethyl and dibutyl adipates, and demonstrated that these compounds possess underappreciated potential as PCMs at sub-zero temperatures. The goal of the current work is to expand on this research by contributing new phase equilibrium data and deepening our understanding of the fundamental thermodynamics governing low-temperature phase behaviour in di-n-alkyl-adipates. The phase diagram for the DMA + DPA binary system was obtained using three complementary techniques: differential scanning calorimetry (DSC), hot-stage microscopy (HSM), and Raman spectroscopy. DSC analysis of sixteen compositions, including the two pure compounds, provided both the temperature and enthalpy values for the solid–liquid and solid–solid phase transitions. The binary system displays eutectic behaviour at low temperatures, with the eutectic point found at 252.83 K and a composition of approximately xDPA = 0.77. Raman spectroscopy confirmed that the system is characterized by a non-isomorphic eutectic phase diagram, indicating differences in the crystal structures of the solid phases. The liquidus line of the binary phase diagram was successfully described using a suitable fitting equation, yielding a root mean square deviation of 0.65 K, indicating excellent agreement between the experimental data and the theoretical model. This fitting also allowed an accurate prediction of the eutectic composition and temperature. A Tammann diagram is also presented, further confirming the eutectic composition and associated enthalpy. This work addresses a gap in the literature by presenting, for the first time, the solid–liquid phase equilibrium behaviour of the DMA + DPA binary system (including the detailed solid–liquid phase diagram of the system). The findings provide valuable insight into the potential use of this system as PCM for sub-zero TES applications, supporting their consideration in future thermal energy storage technologies.por
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT) - UIDB/00313/2025. Fundação para a Ciência e a Tecnologia (FCT) - UIDP/00313/2025. Fundação para a Ciência e a Tecnologia (FCT) - IMS—LA/P/0056/2020UIDB/00100/2020. ERA-Chair Spectroscopy@IKU - (Project number: 101184899) European Research Agency, HORIZON-WIDERA-2023-TALENTS-01-01 Program
dc.identifier.citationSequeira, M.C.M., Nikitin, T., Caetano, F.J.P. et al. Solid-Liquid Phase Diagram of the Dimethyl + Dipropyl Adipates System: Application to Low-Temperature Thermal Energy Storage. Int J Thermophys 46, 131 (2025). https://doi.org/10.1007/s10765-025-03598-2
dc.identifier.doi10.1007/s10765-025-03598-2
dc.identifier.urihttp://hdl.handle.net/10400.2/20686
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer Nature [academic journals on nature.com]
dc.relationCentro de Química Estrutural
dc.relationEquilibrium and Transport Properties of Materials for Sustainable Low Temperature Energy Storage
dc.relation.hasversionhttps://link.springer.com/article/10.1007/s10765-025-03598-2#article-info
dc.rights.urihttp://creativecommons.org/licenses/by-sa/4.0/
dc.subjectAdipates
dc.subjectSolid–liquid phase diagram
dc.subjectPhase Change Material (PCM)
dc.subjectEutectic
dc.subjectLow-temperature energy storage (TES)
dc.titleSolid-liquid phase diagram of the dimethyl + dipropyl adipates system: application to low-temperature thermal energy storageeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentro de Química Estrutural
oaire.awardTitleEquilibrium and Transport Properties of Materials for Sustainable Low Temperature Energy Storage
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/UI%2FBD%2F152239%2F2021/PT
oaire.citation.issue131
oaire.citation.titleInternational Journal of Thermophysics
oaire.citation.volume46
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamOE
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
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person.identifier.ridH-8246-2012
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person.identifier.scopus-author-id57209026585
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project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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