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dc.contributor.authorNisar, Muhammadpt_BR
dc.contributor.authorGalland, Griselda Ligia Barrerapt_BR
dc.contributor.authorGeshev, Julian Penkovpt_BR
dc.contributor.authorBergmann, Carlos Perezpt_BR
dc.contributor.authorQuijada, Raulpt_BR
dc.date.accessioned2023-12-16T03:24:55Zpt_BR
dc.date.issued2023pt_BR
dc.identifier.issn2470-1343pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/268476pt_BR
dc.description.abstractCore–shell magnetic air-stable nanoparticles have attracted increasing interest in recent years. Attaining a satisfactory distribution of magnetic nanoparticles (MNPs) in polymeric matrices is difficult due to magnetically induced aggregation, and supporting the MNPs on a nonmagnetic core–shell is a well-established strategy. In order to obtain magnetically active polypropylene (PP) nanocomposites by melt mixing, the thermal reduction of graphene oxides (TrGO) at two different temperatures (600 and 1000 °C) was carried out, and, subsequently, metallic nanoparticles (Co or Ni) were dispersed on them. The XRD patterns of the nanoparticles show the characteristic peaks of the graphene, Co, and Ni nanoparticles, where the estimated sizes of Ni and Co were 3.59 and 4.25 nm, respectively. The Raman spectroscopy presents typical D and G bands of graphene materials as well as the corresponding peaks of Ni and Co nanoparticles. Elemental and surface area studies show that the carbon content and surface area increase with thermal reduction, as expected, following a reduction in the surface area by the support of MNPs. Atomic absorption spectroscopy demonstrates about 9–12 wt % metallic nanoparticles supported on the TrGO surface, showing that the reduction of GO at two different temperatures has no significant effect on the support of metallic nanoparticles. Fourier transform infrared (FT-IR) spectroscopy shows that the addition of a filler does not alter the chemical structure of the polymer. Fourier transform infrared (FT-IR) spectroscopy shows that the addition of a filler does not alter the chemical structure of the polymer. Scanning electron microscopy of the fracture interface of the samples demonstrates consistent dispersion of the filler in the polymer. The TGA analysis shows that, with the incorporation of the filler, the initial (Tonset) and maximum (Tmax) degradation temperatures of the PP nanocomposites increase up to 34 and 19 °C, respectively. The DSC results present an improvement in the crystallization temperature and percent crystallinity. The filler addition slightly enhances the elastic modulus of the nanocomposites. The results of the water contact angle confirm that the prepared nanocomposites are hydrophilic. Importantly, the diamagnetic matrix is transformed into a ferromagnetic one with the addition of the magnetic filler.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofACS Omega. Washington. Vol. 8, no. 24 (June 2023), p. 21983–21995pt_BR
dc.rightsOpen Accessen
dc.subjectNanopartículas magnéticaspt_BR
dc.subjectNanocompósitospt_BR
dc.subjectÓxido de grafenopt_BR
dc.titleMagnetically stimulable graphene oxide/polypropylene nanocompositespt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001173213pt_BR
dc.type.originEstrangeiropt_BR


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