Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/28487
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dc.contributor.authorGamelas, José A. F.-
dc.contributor.authorPedrosa, Jorge-
dc.contributor.authorLourenço, Ana F.-
dc.contributor.authorMutjé, Pere-
dc.contributor.authorGonzález, Israel-
dc.contributor.authorChinga-Carrasco, Gary-
dc.contributor.authorSingh, Gurvinder-
dc.contributor.authorFerreira, Paulo J.-
dc.date.accessioned2015-03-11T14:44:40Z-
dc.date.available2016-05-01T02:00:15Z-
dc.date.issued2015-05-01-
dc.identifier.citationGAMELAS, José A.F.; PEDROSA, Jorge; LOURENÇO, Ana F.; MUTJÉ, Peré; GONZÁLEZ, Israel; CHINGA-CARRASCO, Gary; SINGH, Gurvinder; FERREIRA, Paulo J.T. - On the morphology of cellulose nanofibrils obtained byTEMPO-mediated oxidation and mechanical treatment. [Em linha]. ISSN: 0968-4328. "Micron". 72 (2015) 28-33.por
dc.identifier.issn0968-4328-
dc.identifier.urihttp://hdl.handle.net/10316/28487-
dc.description.abstractThe morphological properties of cellulose nanofibrils obtained from eucalyptus pulp fibres wereassessed. Two samples were produced with the same chemical treatment (NaClO/NaBr/TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) oxidation), but distinct mechanical treatment intensities duringhomogenization. It was shown that the nanofibrils production yield increases with the mechanicalenergy. The effect of mechanical treatment on the yield was confirmed by laser profilometry of air-driednanocellulose films. However, no significant differences were detected regarding the nanofibrils widthas measured by atomic force microscopy (AFM) of air-dried films. On the other hand, differences in sizewere found either by laser diffraction spectroscopy or by dynamic light scattering (DLS) of the cellulosenanofibrils suspensions as a consequence of the differences in the length distribution of both samples.The nanofibrils length of the more nanofibrillated sample was calculated based on the width measured byAFM and the hydrodynamic diameter obtained by DLS. A length value of ca. 600 nm was estimated. TheDLS hydrodynamic diameter, as an equivalent spherical diameter, was used to estimate the nanofibrilslength assuming a cylinder with the same volume and with the diameter (width) assessed by AFM. Asimple method is thus proposed to evaluate the cellulose nanofibrils length combining microscopy andlight scattering methods.por
dc.language.isoengpor
dc.publisherElsevierpor
dc.rightsembargoedAccesspor
dc.subjectNanofribrillated cellulosepor
dc.subjectTEMPO-oxidised cellulose nanofibrilspor
dc.subjectMorphologypor
dc.subjectSizepor
dc.subjectDynamic light scatteringpor
dc.subjectAtomic force microscopyapor
dc.titleOn the morphology of cellulose nanofibrils obtained byTEMPO-mediated oxidation and mechanical treatmentpor
dc.typearticlepor
degois.publication.firstPage28por
degois.publication.lastPage33por
degois.publication.titleMicronpor
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.micron.2015.02.003por
dc.peerreviewedYespor
dc.identifier.doi10.1016/j.micron.2015.02.003-
degois.publication.volume72por
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextopen-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCIEPQPF – Chemical Process Engineering and Forest Products Research Centre-
crisitem.author.researchunitCIEPQPF – Chemical Process Engineering and Forest Products Research Centre-
crisitem.author.researchunitCIEPQPF – Chemical Process Engineering and Forest Products Research Centre-
crisitem.author.orcid0000-0002-1474-767X-
crisitem.author.orcid0000-0002-2860-9833-
crisitem.author.orcid0000-0001-8211-4949-
crisitem.author.orcid0000-0002-4503-6811-
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais
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