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dc.contributor.authorde Menezes, Fernando Lima
dc.contributor.authorAndrade Neto, Davino Machado
dc.contributor.authorLinhares Rodrigues, Maria Do Livramento
dc.contributor.authorSilva Lima, Helder Levi
dc.contributor.authorPaiva, D. V.M.
dc.contributor.authorSantos da Silva, Marcelo Antônio
dc.contributor.authorUchoa Dutra Fechine, Lillian Maria
dc.contributor.authorBezerra Sombra, Antônio Sérgio
dc.contributor.authorMelo Freire, Rafael
dc.contributor.authorCasagrande Denardin, Juliano
dc.contributor.authorde Freitas Rosa, Morsyleide
dc.contributor.authorDe Souza Filho, Men De Sá Moreira
dc.contributor.authorMazzetto, Selma E.
dc.contributor.authorAlmeida Fechine, Pierre Basílio
dc.date.accessioned2021-05-05T05:26:43Z
dc.date.available2021-05-05T05:26:43Z
dc.date.issued2020
dc.identifier10.3390/jcs4040144
dc.identifier.issn2504477X
dc.identifier.urihttps://hdl.handle.net/20.500.12728/8841
dc.description.abstractMagneto-dielectric composites are interesting advanced materials principally due to their potential applications in electronic fields, such as in microstrip antennas substrates. In this work, we developed superparamagnetic polymer-based films using the biopolymeric matrices chitosan (Ch), cellulose (BC) and collagen (Col). For this proposal, we synthesized superparamagnetic iron oxide nanoparticles (SPIONs) functionalized with polyethyleneimine with a cheap method using sonochemistry. Further, the SPIONs were dispersed into polymer matrices and the composites were evaluated regarding morphology, thermal, dielectric and magnetic properties and their application as microstrip antennas substrates. Microscopically, all tested films presented a uniform dispersion profile, principally due to polyethyleneimine coating. Under an operating frequency (fo) of 4.45 GHz, Ch, BC and Col-based SPION substrates showed moderate dielectric constant (ε′) values in the range of 5.2–8.3, 6.7–8.4 and 5.9–9.1, respectively. Furthermore, the prepared films showed no hysteresis loop, thereby providing evidence of superparamagnetism. The microstrip antennas showed considerable bandwidths (3.37–6.34%) and a return loss lower than −10 dB. Besides, the fo were modulated according to the addition of SPIONs, varying in the range of 4.69–5.55, 4.63–5.18 and 4.93–5.44 GHz, for Ch, BC and Col-based substrates, respectively. Moreover, considering best modulation of ε′ and fo, the Ch-based SPION film showed the most suitable profile as a microstrip antenna substrate.es_ES
dc.language.isoenes_ES
dc.publisherMDPI AGes_ES
dc.subjectBiopolymerses_ES
dc.subjectMagnetic-dielectric propertyes_ES
dc.subjectMicrostrip antennases_ES
dc.subjectNanocompositeses_ES
dc.titleFrom magneto-dielectric biocomposite films to microstrip antenna deviceses_ES
dc.typeArticlees_ES


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