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Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids

2020-06-01Journal article Restricted access
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dc.contributor.authorAlves, L.
dc.contributor.authorFerraz, Eduardo
dc.contributor.authorLourenço, A. F.
dc.contributor.authorFerreira, P. J.
dc.contributor.authorRasteiro, M. G.
dc.contributor.authorGamelas, J. A. F.
dc.date.accessioned2021-12-22T23:31:27Z
dc.date.available2021-12-22T23:31:27Z
dc.date.issued2020-06-01
dc.date.updated2021-12-22T19:40:35Z
dc.description.abstractThe present work intends to study the variations in the rheological properties and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils (CNF) aqueous suspensions, as a function of changes in concentration and systematic changes in the pH, by addition of acids with different anions. It was found that CNF suspensions form strong gels at mass fractions higher than 0.35 % and the gel point is ca. 0.18 %. On the other hand, aggregation is enhanced at acidic pH conditions due to lower charge repulsion among fibrils, leading to an increase of the suspension viscosity. However, distinct rheological behaviours were presented by CNF suspensions as different acids were applied. It was found that phosphate ions resulted in significant aggregation leading to formation of particles of large size and very strong gels, at pH 2.3; distinctly, the presence of acetate ions resulted in lower aggregation, lower particle size and weaker gels, at the same pH value.pt_PT
dc.description.sponsorshipThe present research was supported by the R&D Project “FILCNF- New generation of composite films of cellulose nanofibrils with mineral particles as high strength materials with gas barrier properties” (PTDC/QUI-OUT/31884/2017, CENTRO 01-0145-FEDER-031884) and Strategic Research Centre Project,UIDB00102/2020, both funded by the Fundação para a Ciência e Tecnologia (FCT). A. F. Lourenço also acknowledges Fundação para a Ciência e Tecnologia for the PhD grant (SFRH/BDE /108095/2015).pt_PT
dc.description.sponsorshipCENTRO-01-0145-FEDER-031884
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.carbpol.2020.116109pt_PT
dc.identifier.issn0144-8617
dc.identifier.slugcv-prod-1388152
dc.identifier.urihttp://hdl.handle.net/10400.26/38421
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationNew generation of composite films of cellulose nanofibrils with mineral particles as high strength materials with gas barrier properties
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/abs/pii/S0144861720302836pt_PT
dc.subjectCellulose nanofibrilspt_PT
dc.subjectCharged nanofibrilspt_PT
dc.subjectRheological propertiespt_PT
dc.subjectHydrogelspt_PT
dc.subjectAggregationpt_PT
dc.subjectAcidspt_PT
dc.subjectProtonationpt_PT
dc.subjectHofmeister seriespt_PT
dc.titleTuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acidspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleNew generation of composite films of cellulose nanofibrils with mineral particles as high strength materials with gas barrier properties
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FQUI-OUT%2F31884%2F2017/PT
oaire.citation.startPage116109pt_PT
oaire.citation.titleCarbohydrate Polymerspt_PT
oaire.citation.volume237pt_PT
oaire.fundingStream9471 - RIDTI
person.familyNameFerraz
person.givenNameEduardo
person.identifier.ciencia-idC517-A240-7C81
person.identifier.orcid0000-0003-4717-6305
person.identifier.ridB-7140-2014
person.identifier.scopus-author-id7003480912
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.cv.cienciaidC517-A240-7C81 | Eduardo Jorge Marques de Oliveira Ferraz
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication94c2590f-fd7a-44e1-b6cd-31297c9da934
relation.isAuthorOfPublication.latestForDiscovery94c2590f-fd7a-44e1-b6cd-31297c9da934
relation.isProjectOfPublication14949fdf-d268-4ae5-9f3c-5c346049b23d
relation.isProjectOfPublication.latestForDiscovery14949fdf-d268-4ae5-9f3c-5c346049b23d

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