Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/28015
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dc.contributor.authorGamelas, José A. F.-
dc.contributor.authorPedrosa, Jorge-
dc.contributor.authorLourenço, Ana F.-
dc.contributor.authorFerreira, Paulo J.-
dc.date.accessioned2015-01-12T17:39:22Z-
dc.date.available2015-01-12T17:39:22Z-
dc.date.issued2014-12-30-
dc.identifier.citationGAMELAS, J.A.F.; PEDROSA, J.; LOURENÇO, A.F.; FERREIRA, P.J. - Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography.[Em linha]. "Colloids and Surfaces A : Physicochemical and Engineering Aspects". ISSN: 0927-7757. 469 (2015), 36-41. Disponivel na WWW: http://dx.doi.org/10.1016/j.colsurfa.2014.12.058por
dc.identifier.issn0927-7757-
dc.identifier.urihttp://hdl.handle.net/10316/28015-
dc.description.abstractThe adhesion and surface properties of nanocelluloses are an important issue to consider when using this material for composites production, in food packaging or coatings, as well as for determining the influence of added functional groups. In the present work, the surface properties of two nanofibrillated celluloses obtained by mild 2,2,6,6-tetramethylpiperidine-1- oxyl radical (TEMPO)-mediated oxidation with distinct mechanical treatment intensity in a homogenizer (5 and 15 passes), and one nanofibrillated cellulose obtained by enzymatic process, were thoroughly assessed by inverse chromatography, at infinite dilution conditions. The dispersion component of the surface energy ( s d) was 42-46 mJ m-2 at 40 ºC for the TEMPO nanofibres and 52 mJ m-2 for the enzymatic nanocellulose. It was confirmed, based on the determination of the specific components of the works of adhesion and enthalpies of adsorption with polar probes, that the surfaces of the materials have a more Lewis acidic than Lewis basic character. Regarding TEMPO nanofibres, a slight increase of Lewis acidity/basicity ratio seemed to occur for the more nanofibrillated material (15-passes). Higher specific interactions with polar probes were found for enzymatic nanocellulose. The higher values of s d and specific interactions observed for the enzymatic nanocellulose could partly be due to the higher crystallinity of this sample. On the other hand, the increase of the acidity/basicity ratio (as well as of the s d value) for the 15-passes vs. 5-passes TEMPO nanofibres was attributed to a higher exposition of the hydroxyl groups of cellulose at the surface of the former material.por
dc.language.isoengpor
dc.publisherElsevierpor
dc.rightsopenAccesspor
dc.subjectCompositespor
dc.subjectInverse gas chromatographypor
dc.subjectNanocellulosepor
dc.subjectSurface energypor
dc.subjectLewis acid-base characterpor
dc.titleSurface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatographypor
dc.typearticlepor
degois.publication.titleColloids and Surfaces A : Physicochemical and Engineering Aspects : An International Journal Devoted to the Principles and Applications of Colloid and Interface Sciencepor
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.colsurfa.2014.12.058por
dc.peerreviewedYespor
dc.identifier.doi10.1016/j.colsurfa.2014.12.058-
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.orcid0000-0002-4503-6811-
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais
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