Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/95604
DC FieldValueLanguage
dc.contributor.authorAlmeida, R. O.-
dc.contributor.authorRamos, A.-
dc.contributor.authorAlves, L.-
dc.contributor.authorPotsi, E.-
dc.contributor.authorFerreira, P. J. T.-
dc.contributor.authorCarvalho, M. G. V. S.-
dc.contributor.authorRasteiro, M. G.-
dc.contributor.authorGamelas, J. A. F.-
dc.date.accessioned2021-08-17T11:47:57Z-
dc.date.available2021-08-17T11:47:57Z-
dc.date.issued2021-08-06-
dc.identifier.issn01418130pt
dc.identifier.urihttp://hdl.handle.net/10316/95604-
dc.description.abstractWood/wastes from invasive tree species Acacia dealbata and Ailanthus altissima were used to produce high-value added nanocellulose. Firstly, bleached pulps were produced from the wood of these tree species after kraft cooking. Afterwards, the resultant pulps were pre-treated by TEMPO-mediated oxidation (Acacia dealbata) or enzymatic hydrolysis (Ailanthus altissima) followed by high-pressure homogenization. Hydrogels were obtained and characterized for their main physical and chemical properties, including rheology and evaluation of the surface properties of the freeze-dried materials by inverse gas chromatography. Results showed that micro/nanofibrils could be obtained from the wood of these invasive species. Rheometry studies showed that Acacia-TEMPO cellulose nanofibrils form strong gels with high yield stress point and viscosities (reaching ca. 100,000 Pa·s). Additionally, the surfaces of the obtained nanocelluloses showed a dispersive component of the surface energy near 40 mJ/m2 and a prevalence of the Lewis acidic character over the basic one, as typical for cellulose-based materials. Finally, films with good mechanical and optical properties could be obtained from the cellulose hydrogels. Acacia-TEMPO film (produced by filtration/hot pressing) showed a tensile strength of 79 MPa, Young's modulus of 7.9 GPa, and a transparency of 88%. The water vapor barrier, however, was modest (permeability of 4.9 × 10-6 g/(Pa·day·m)).pt
dc.language.isoengpt
dc.publisherElsevierpt
dc.relationinfo:eu-repo/grantAgreement/MATIS/CENTRO-01-0145-FEDER-000014/PTpt
dc.relationinfo:eu-repo/grantAgreement/FCT/UIDB/00102/ 2020/PTpt
dc.rightsembargoedAccesspt
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt
dc.subjectCellulose nanofibrilspt
dc.subjectCircular economypt
dc.subjectFilmspt
dc.subjectInvasive speciespt
dc.subjectInverse gas chromatographypt
dc.subjectWaste valorisationpt
dc.titleProduction of nanocellulose gels and films from invasive tree speciespt
dc.typearticle-
degois.publication.titleInternational Journal of Biological Macromoleculespt
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0141813021016743pt
dc.peerreviewedyespt
dc.identifier.doi10.1016/j.ijbiomac.2021.08.015pt
dc.date.embargo2022-08-06*
uc.date.periodoEmbargo365pt
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextembargo_20220806-
crisitem.author.deptFaculty of Sciences and Technology-
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.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.orcid0000-0002-4503-6811-
crisitem.author.orcid0000-0002-6636-3133-
crisitem.author.orcid0000-0001-6084-4553-
crisitem.author.orcid0000-0002-1474-767X-
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais
Files in This Item:
File Description SizeFormat Login
Poofs_pagination_BIOMAC_19077.pdf1.58 MBAdobe PDFEmbargo Access    Request a copy
Show simple item record

Page view(s)

38
checked on Oct 15, 2021

Download(s)

3
checked on Oct 15, 2021

Google ScholarTM

Check

Altmetric

Altmetric


This item is licensed under a Creative Commons License Creative Commons