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Molecular order and dynamics of water in hybrid cellulose acetate-silica asymmetric membranes

2019-04-18Journal article Restricted access
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dc.contributor.authorBeira, Maria Jardim
dc.contributor.authorCondesso, Miguel
dc.contributor.authorPereira Da Silva, Miguel
dc.contributor.authorCosme, Pedro
dc.contributor.authorAlmeida, Pedro L.
dc.contributor.authorCorvo, Marta C.
dc.contributor.authorSebastião, Pedro J.
dc.contributor.authorFigueirinhas, João
dc.contributor.authorDe Pinho, Maria Norberta
dc.date.accessioned2019-01-29T11:41:59Z
dc.date.available2019-01-29T11:41:59Z
dc.date.issued2019-04-18
dc.description.abstractIn this work 2H NMR spectroscopy and 1H NMR relaxometry and diffusometry were used to characterise water order and dynamics in cellulose acetate/silica asymmetric membranes. Two hydrated membranes were characterised allowing the identification of extra ordering of the water molecules and the presence in each membrane of up to two spectral components with different degrees of order and different T1 values. The mechanism behind this order increase was ascribed to the rapid exchange of the water molecules between the pore walls and its interior. T1 relaxometry dispersions allowed for the identification of the relevant mechanisms of pore-confined water motion, with rotations mediated by translational displacements (RMTD) as the dominant mechanism in the low frequency region. Using the RMTD low cut off frequency along with the in situ directly measured diffusion constant it was possible do determine characteristic lengths of correlated water motion in both membranes studied, which fall in ranges compatible with typical pore dimensions in similar membranes.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBEIRA, Maria Jardim; [et al] – Molecular order and dynamics of water in hybrid cellulose acetate-silica asymmetric membranes. Molecular Physics. ISSN 0026-8976. Vol. 117, N.º 7-8 SI (2019), pp. 975-982pt_PT
dc.identifier.doihttps://doi.org/10.1080/00268976.2018.1537526pt_PT
dc.identifier.issn0026-8976
dc.identifier.issn1362-3028
dc.identifier.urihttp://hdl.handle.net/10400.21/9374
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherTaylor & Francispt_PT
dc.relationUID/CTM/01540/2013 - FCTpt_PT
dc.relationPTDC/CTM-BIO/6178/2014 - FCTpt_PT
dc.relationCOST Action CA15209 EURELAX-European Network on NMR Relaxometrypt_PT
dc.relation.publisherversionhttps://www.tandfonline.com/doi/pdf/10.1080/00268976.2018.1537526?needAccess=truept_PT
dc.subjectCellulose acetatept_PT
dc.subjectAsymmetric membranespt_PT
dc.subjectProton relaxometry;pt_PT
dc.subjectDynamic processespt_PT
dc.subjectMolecular dynamicspt_PT
dc.subjectMembranas assimétricaspt_PT
dc.titleMolecular order and dynamics of water in hybrid cellulose acetate-silica asymmetric membranespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FCTM%2F50025%2F2013/PT
oaire.citation.endPage982pt_PT
oaire.citation.issue7-8
oaire.citation.startPage975pt_PT
oaire.citation.titleMolecular Physicspt_PT
oaire.citation.volume117
oaire.fundingStream5876
person.familyNamePereira da Silva
person.familyNameCosme e Silva
person.familyNameMarques de Almeida
person.familyNameCorvo
person.familyNameOliveira Sebastião
person.familyNameFigueirinhas
person.familyNamede Pinho
person.givenNameMiguel
person.givenNamePedro Afonso
person.givenNamePedro
person.givenNameMarta Cristina Parracho Cançado
person.givenNamePedro José
person.givenNameJoão
person.givenNameMaria Norberta
person.identifier2193087
person.identifierM-9636-2013
person.identifier2206212
person.identifier807529
person.identifier.ciencia-idC915-78B4-ED44
person.identifier.ciencia-id6213-6C3F-17CC
person.identifier.ciencia-id0218-71B2-2DE0
person.identifier.ciencia-idBA1A-5C94-CA3A
person.identifier.ciencia-id6712-042E-971B
person.identifier.ciencia-idCB1B-52B5-D425
person.identifier.ciencia-id8617-E671-C3E7
person.identifier.orcid0000-0002-3164-8614
person.identifier.orcid0000-0001-6754-7762
person.identifier.orcid0000-0001-7356-8455
person.identifier.orcid0000-0003-0890-6133
person.identifier.orcid0000-0001-6450-3019
person.identifier.orcid0000-0001-9254-1864
person.identifier.orcid0000-0002-5339-1784
person.identifier.ridG-3204-2019
person.identifier.ridB-4356-2009
person.identifier.ridA-4278-2013
person.identifier.scopus-author-id57208126626
person.identifier.scopus-author-id57190384213
person.identifier.scopus-author-id6602470713
person.identifier.scopus-author-id55909453200
person.identifier.scopus-author-id7005561562
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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