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Water-Based Cellulose Liquid Crystal System Investigated by Rheo-NMR

2013-06-11Journal article Open access
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dc.contributor.authorGeng, Yong
dc.contributor.authorAlmeida, Pedro L.
dc.contributor.authorFeio, Gabriel
dc.contributor.authorFigueirinhas, João
dc.contributor.authorGodinho, Maria Helena
dc.date.accessioned2013-11-02T20:00:58Z
dc.date.available2013-11-02T20:00:58Z
dc.date.issued2013-06-11
dc.description.abstractWater-based cellulose cholesteric liquid crystalline phases at rest can undergo structural changes induced by shear flow. This reflects on the deuterium spectra recorded when the system is investigated by rheo-nuclear magnetic resonance (rheo-NMR) techniques. In this work, the model system hydroxypropylcellulose (HPC)+water is revisited using rheo-NMR to clarify unsettled points regarding its behavior under shear and in relaxation. The NMR spectra allow the identification of five different stable ordering states, within shear and relaxation, which are well integrated in a mesoscopic picture of the system's structural evolution under shear and relaxation. This picture emerging from the large body of studies available for this system by other experimental techniques, accounts well for the NMR data and is in good agreement with the three distinct regions of steady shear flow recognized for some lyotropic LC polymers. Shear rates in between 0.1 and 1.0 s(-1) where investigated using a Taylor-Couette flow and deuterated water was used as solvent for the deuterium NMR (DNMR) analysis.por
dc.identifier.citationGENG, Yong; ALMEIDA, Pedro L.; FEIO, Gabriel M.; FIGUEIRINHAS, Joao L.; GODINHO, Maria H. - Water-Based Cellulose Liquid Crystal System Investigated by Rheo-NMR. Macromolecules. ISSN 0024-9297. Vol. 46, nr. 11 (2013), p. 4296-4302.por
dc.identifier.issn0024-9297
dc.identifier.other10.1021/ma400601b
dc.identifier.urihttp://hdl.handle.net/10400.21/2858
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherAmer Chemical Socpor
dc.subjectNuclear-magnetic-resonancepor
dc.subjectHydroxypropylcellulose solutionspor
dc.subjectMolecular-orientationpor
dc.subjectAqueous-solutionspor
dc.subjectPolymerpor
dc.subject(Hydroxypropyl)cellulosepor
dc.subjectFilmspor
dc.subjectTemperaturepor
dc.subjectFlowpor
dc.titleWater-Based Cellulose Liquid Crystal System Investigated by Rheo-NMRpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceWashingtonpor
oaire.citation.endPage4302por
oaire.citation.issue11por
oaire.citation.startPage4296por
oaire.citation.titleMacromoleculespor
oaire.citation.volume46por
person.familyNameMarques de Almeida
person.familyNameFeio
person.familyNameFigueirinhas
person.familyNameGodinho
person.givenNamePedro
person.givenNameGabriel
person.givenNameJoão
person.givenNameMaria Helena
person.identifier2206212
person.identifier.ciencia-id0218-71B2-2DE0
person.identifier.ciencia-idCB1B-52B5-D425
person.identifier.ciencia-idC316-7B1F-4513
person.identifier.orcid0000-0001-7356-8455
person.identifier.orcid0000-0003-1257-5824
person.identifier.orcid0000-0001-9254-1864
person.identifier.orcid0000-0002-9760-5983
person.identifier.ridB-4356-2009
person.identifier.ridJ-3695-2013
person.identifier.ridA-4278-2013
person.identifier.ridJ-3679-2013
person.identifier.scopus-author-id57190384213
person.identifier.scopus-author-id24484581400
person.identifier.scopus-author-id55909453200
person.identifier.scopus-author-id7005654016
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication429b6d71-328e-42b3-8151-15493de249b8
relation.isAuthorOfPublicationa15cb9fe-ebbc-4450-a85c-77e4680b1967
relation.isAuthorOfPublication8287ac27-3195-4e9d-956f-63e80198f99e
relation.isAuthorOfPublication9e92c2e7-f179-42a4-b284-2b30b769aa0b
relation.isAuthorOfPublication.latestForDiscovery429b6d71-328e-42b3-8151-15493de249b8

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