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Impact of nanoconfinement on the physical state and conductivity mechanisms of a 2-picolinium ionic liquid crystal

2024-06-01Artigo científico Acesso aberto
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dc.contributor.authorSantos, Andreia F. M.
dc.contributor.authorTeresa Viciosa, M.
dc.contributor.authorMatos, Inês
dc.contributor.authorSotomayor, João C.
dc.contributor.authorFigueirinhas, João L.
dc.contributor.authorGodinho, Maria H.
dc.contributor.authorBranco, Luís C.
dc.contributor.authorDias, C. J.
dc.contributor.authorDionísio, Madalena
dc.contributor.institutionDQ - Departamento de Química
dc.contributor.institutionLAQV@REQUIMTE
dc.contributor.institutionDCM - Departamento de Ciência dos Materiais
dc.contributor.institutionCENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)
dc.contributor.pblElsevier
dc.date.accessioned2024-05-24T00:31:39Z
dc.date.available2024-05-24T00:31:39Z
dc.date.issued2024-06-01
dc.descriptionFunding Information: This work was supported by the Associate Laboratory for Green Chemistry LAQV ( UID/QUI/50006/2019 ), i3N (UID/ CTM / 50025/2019 ) and CeFEMA (UID/ CTM / 04540/2019 ), which are financed by national funds from FCT- MCTES and by FEDER funds through the COMPETE 2020 Program. The authors also thank the National Funds through FCT- MCTES and POR Lisboa 2020, under the project numbers PTDC/EAM - AMB / 2023/2021 ( SUSTECH4H2O ), POCI-01-0145-FEDER-007688 and European Interdisciplinary Action ( COST Action CA21159 , PhoBioS). A. F. M. Santos also acknowledges FCT- MCTES for the PhD Grant ( SFRH/BD/132551/2017 ) and I. Matos for the contract CEECIND/004431/2022 . Funding Information: This work was supported by the Associate Laboratory for Green Chemistry LAQV, Portugal, (LA/P/0008/2020, UIDB/50006/2020, UIDP/50006/2020), i3N, Portugal, (LA/P/0037/2020, UIDB/50025/2020, UIDP/50025/2020), CQE, Portugal, (UIDB/00100/2020, UIDP/00100/2020) and CeFEMA, Portugal, (UIDB/04540/2020, UIDP/04540/2020), which are financed by national funds from FCT-MCTES, Portugal, and by FEDER funds through the COMPETE 2020, Portugal, Program. The authors also thank the National Funds through FCT-MCTES, Portugal and POR Lisboa 2020, under the project numbers PTDC/EAM-AMB/2023/2021 (SUSTECH4H2O), POCI-01-0145-FEDER-007688 and European Interdisciplinary Action (COST Action, Belgium, CA21159, PhoBioS). A. F. M. Santos also acknowledges FCT-MCTES, Portugal, for the PhD Grant (SFRH/BD/132551/2017) and I. Matos for the contract CEECIND/004431/2022. Publisher Copyright: © 2024 The Author(s)
dc.description.abstractHybrid solid-like materials prepared from the incorporation of liquid-like ionic conductors into nanoporous matrices could represent an advantage for a variety of electronic applications. Aiming to obtain such materials, three composites of the polymorphic ionic liquid crystal (ILC) 1-hexadecyl-2-methylpyridinium bromide ([C16-2-Pic][Br]), loaded in the mesoporous inorganic silica SBA-15 (∼6.8 nm in pore diameter), were prepared at guest–host weight fractions of ∼ 40, 60 and 80% (w/w) and investigated by different techniques: ATR-FTIR, BET, TGA, XRD and DSC. Complete amorphisation was achieved for the 40 and 60% composites, while the 80% preparation was stabilised in the low-T morph of native C16, being in the liquid state at room temperature. Furthermore, through Dielectric Relaxation Spectroscopy, the ionic conductivity of the three hybrid materials was characterised, allowing to deconvolute this property in a pure ohmic contribution (conductivity I) and the overlapping of ac − dc transition with interfacial polarisation resulting from the coexistence of the ionic liquid and the quasi-insulating inorganic matrix (conductivity II). From –20 to 20 °C, the conductivity and the corresponding charge migration are faster in all composites relative to the neat ILC, as deduced from the inferior radii of Nyquist arcs. The 60% preparation stood out from the other materials, exhibiting direct conductivity unaffected by electrode polarisation over a larger T-range, leading to the assumption of a nearly continuous silica-mediated charge migration pathway, which is never reached for the 40% composite, while, in the 80% preparation, some C16 deposits on the outer surface of the pores. Incorporation into the silica matrix proved to be a good strategy for the production of cost-efficient materials with long-term stabilisation of the ionic liquid in a single phase over a large range of temperatures, enabling the prediction of flow and conductive properties.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent15
dc.format.extent7734694
dc.identifier.doi10.1016/j.molliq.2024.124830
dc.identifier.issn0167-7322
dc.identifier.otherPURE: 91497589
dc.identifier.otherPURE UUID: d0d4b72a-05a0-45eb-9c4d-bf262c5c6a75
dc.identifier.otherScopus: 85192001990
dc.identifier.otherORCID: /0000-0002-1487-0889/work/160202737
dc.identifier.urihttp://hdl.handle.net/10362/167743
dc.identifier.urlhttps://www.scopus.com/pages/publications/85192001990
dc.language.isoeng
dc.peerreviewedyes
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FQUI%2F50006%2F2019/PT
dc.relationAssociated Laboratory for Green Chemistry - Clean Technologies and Processes
dc.relationInstitute of Nanostructures, Nanomodelling and Nanofabrication
dc.relationCenter of Physics and Engineering of Advanced Materials
dc.relationIonic Liquid Crystals as Multi-stimuli versatile chromogenic materials
dc.relationAssociated Laboratory for Green Chemistry - Clean Technologies and Processes
dc.relationAssociated Laboratory for Green Chemistry - Clean Technologies and Processes
dc.relationAssociated Laboratory for Green Chemistry - Clean Technologies and Processes
dc.relationInstitute of Nanostructures, Nanomodelling and Nanofabrication
dc.relationInstitute of Nanostructures, Nanomodelling and Nanofabrication
dc.relationInstitute of Nanostructures, Nanomodelling and Nanofabrication
dc.relationCentro de Química Estrutural
dc.relationCentro de Química Estrutural
dc.relationCenter of Physics and Engineering of Advanced Materials
dc.relationCenter of Physics and Engineering of Advanced Materials
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50025%2F2020/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50025%2F2020/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00100%2F2020/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04540%2F2020/PT
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dc.relationinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBD%2F132551%2F2017/PT
dc.subjectCharge migration mechanisms
dc.subjectConfinement
dc.subjectDielectric Relaxation Spectroscopy
dc.subjectIonic conductivity
dc.subjectIonic liquid crystals
dc.subjectNyquist plots and circuits
dc.subjectElectronic, Optical and Magnetic Materials
dc.subjectAtomic and Molecular Physics, and Optics
dc.subjectCondensed Matter Physics
dc.subjectSpectroscopy
dc.subjectPhysical and Theoretical Chemistry
dc.subjectMaterials Chemistry
dc.titleImpact of nanoconfinement on the physical state and conductivity mechanisms of a 2-picolinium ionic liquid crystalen
dc.typejournal article
degois.publication.titleJournal of Molecular Liquids
degois.publication.volume403
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oaire.awardTitleIonic Liquid Crystals as Multi-stimuli versatile chromogenic materials
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oaire.awardTitleCentro de Química Estrutural
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