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Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites

[Image: see text] Core–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 nonmagnet...

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Autores principales: Nisar, Muhammad, Galland, Griselda Barrera, Geshev, Julian, Bergmann, Carlos, Quijada, Raúl
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10286093/
https://www.ncbi.nlm.nih.gov/pubmed/37360436
http://dx.doi.org/10.1021/acsomega.3c01917
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author Nisar, Muhammad
Galland, Griselda Barrera
Geshev, Julian
Bergmann, Carlos
Quijada, Raúl
author_facet Nisar, Muhammad
Galland, Griselda Barrera
Geshev, Julian
Bergmann, Carlos
Quijada, Raúl
author_sort Nisar, Muhammad
collection PubMed
description [Image: see text] Core–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. 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 (T(onset)) and maximum (T(max)) 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.
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spelling pubmed-102860932023-06-23 Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites Nisar, Muhammad Galland, Griselda Barrera Geshev, Julian Bergmann, Carlos Quijada, Raúl ACS Omega [Image: see text] Core–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. 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 (T(onset)) and maximum (T(max)) 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. American Chemical Society 2023-06-08 /pmc/articles/PMC10286093/ /pubmed/37360436 http://dx.doi.org/10.1021/acsomega.3c01917 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Nisar, Muhammad
Galland, Griselda Barrera
Geshev, Julian
Bergmann, Carlos
Quijada, Raúl
Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites
title Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites
title_full Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites
title_fullStr Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites
title_full_unstemmed Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites
title_short Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites
title_sort magnetically stimulable graphene oxide/polypropylene nanocomposites
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10286093/
https://www.ncbi.nlm.nih.gov/pubmed/37360436
http://dx.doi.org/10.1021/acsomega.3c01917
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