Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/33048
DC FieldValueLanguage
dc.contributor.authorPedrosa, Jorge-
dc.contributor.authorGamelas, J.A.F.-
dc.contributor.authorLourenço, Ana F.-
dc.contributor.authorFerreira, Paulo J.-
dc.date.accessioned2016-11-23T23:20:40Z-
dc.date.available2016-11-23T23:20:40Z-
dc.date.issued2016-02-24-
dc.identifier.issn0927-7757por
dc.identifier.urihttp://hdl.handle.net/10316/33048-
dc.description.abstractThe physico chemical surface properties of precipitated calcium carbonate (PCC) modified with silica by sol-gel method were evaluated using inverse gas chromatography and compared to those of the original PCC. The modification of the surface of PCC crystals by a dense film of silica provided a slight decrease of the dispersive component of the surface energy and a significant decrease of the specific component of the work of adhesion with trichloromethane (a Lewis acidic probe). In addition, interactions measured with weak Lewis bases (1-alkenes) also revealed differences between PCC and PCC-silica samples. Differences in the surface properties (namely of the Lewis acid-base ones) of PCCs modified with distinct silica content (ca. 22 and 30 wt%), were also found, and were interpreted as being due to the different accessibility of silanol groups (Si-OH) on the materials surface: a higher prevalence of these acidic groups in the material with lower silica content increases the specific affinity to Lewis basic probes and decreases the affinity to Lewis acidic probe. X-ray photoelectron spectroscopy results confirmed the presence of silica on PCC, with a higher Si/Ca atomic ratio being found for the material with higher silica content.por
dc.language.isoengpor
dc.publisherElsevierpor
dc.rightsopenAccesspor
dc.subjectPrecipitated calcium carbonatepor
dc.subjectSilicapor
dc.subjectSol-gel methodpor
dc.subjectSurface physical-chemical propertiespor
dc.subjectIGCpor
dc.subjectXPSpor
dc.titleSurface properties of calcium carbonate modified with silica by sol-gel methodpor
dc.typearticle-
degois.publication.firstPage1por
degois.publication.lastPage7por
degois.publication.titleColloids and Surfaces A: Physicochemical and Engineering Aspectspor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0927775716300863por
dc.peerreviewedyespor
dc.identifier.doi10.1016/j.colsurfa.2016.02.020por
dc.identifier.doi10.1016/j.colsurfa.2016.02.020-
degois.publication.volume497por
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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