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		<doi>10.1016/j.jmmm.2022.170007</doi>
		<issn>0304-8853</issn>
		<citationkey>ReisGomBalRibRez:2022:InCaIr</citationkey>
		<title>The influence of carbonyl iron and magnetite ferrite on the electromagnetic behavior of nanostructured composites based on epoxy resin/buckypapers</title>
		<year>2022</year>
		<month>Dec.</month>
		<typeofwork>journal article</typeofwork>
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		<author>Reis, Felips Carlos dos,</author>
		<author>Gomes, Newton Adriano dos Santos,</author>
		<author>Baldan, Maurício Ribeiro,</author>
		<author>Ribeiro, Bruno,</author>
		<author>Rezende, Mirabel Cerqueira,</author>
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		<group>CMS-ETES-DIPGR-INPE-MCTI-GOV-BR</group>
		<group>COPDT-CGIP-INPE-MCTI-GOV-BR</group>
		<affiliation>Universidade Federal de São Paulo (UNIFESP)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade Federal de São Paulo (UNIFESP)</affiliation>
		<affiliation>Universidade Federal de São Paulo (UNIFESP)</affiliation>
		<electronicmailaddress>fecreis@hotmail.com</electronicmailaddress>
		<electronicmailaddress>newtonnasg@yahoo.com.br</electronicmailaddress>
		<electronicmailaddress>mauricio.baldan@inpe.br</electronicmailaddress>
		<journal>Journal of Magnetism and Magnetic Materials</journal>
		<volume>563</volume>
		<pages>e170007</pages>
		<secondarymark>A1_ENGENHARIAS_II A2_INTERDISCIPLINAR A2_ENGENHARIAS_III A2_BIODIVERSIDADE B1_MEDICINA_II B1_MEDICINA_I B1_GEOCIÊNCIAS B1_FARMÁCIA B1_ENGENHARIAS_IV B2_QUÍMICA B2_MATERIAIS B2_MATEMÁTICA_/_PROBABILIDADE_E_ESTATÍSTICA B2_CIÊNCIAS_BIOLÓGICAS_III B2_CIÊNCIAS_BIOLÓGICAS_II B2_CIÊNCIAS_BIOLÓGICAS_I B2_BIOTECNOLOGIA B2_ASTRONOMIA_/_FÍSICA B3_ECONOMIA</secondarymark>
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		<keywords>Carbonyl iron, CNTs, EMI shielding, Epoxy composites, Magnetite, Microwave absorption.</keywords>
		<abstract>Due to their remarkable mechanical and electrical properties, carbon nanotubes (CNTs) and their composites are great candidates for materials with improved electromagnetic and electrical properties. Above all, when used in conjunction with magnetic particles, for example, carbonyl iron and ferrites, the energy losses can be improved, minimizing the microwave reflections. This work studies the influence of magnetic particles (carbonyl iron and magnetite ferrite) on the electromagnetic behavior of carbon nanotube buckypaper (BP) reinforced epoxy composites over the frequency range 8.2  12.4 GHz. Firstly, the carbonyl iron and magnetite ferrite were dispersed in the epoxy resin, and their electromagnetic properties were analyzed. Epoxy/carbonyl iron composites showed reduced reflection losses at 10 GHz (SER = 1.521.99 dB) and improved absorption results (SEA = 0.475.78 dB). Epoxy/magnetite samples showed higher SER and SEA than carbonyl iron samples, with values ranging around 1.723.93 dB and 0.437.21 dB at 10 GHz, respectively. The addition of carbon nanotube buckypaper in the carbonyl iron composites resulted in SEA values up to 19.68 dB at 10 GHz. Besides, the BP/magnetite composites showed SEA of 18.58 dB at the same frequency. The total shielding efficiency (SET) was reached with 40 % wt. of magnetite (SET = 21.60 dB, at 10 GHz) and 70 % wt. of carbonyl iron (SET = 23.43 dB, at 10 GHz). Despite the variation in the magnetic filler concentration, all ternary hybrid composites showed increased absorption properties. This behavior is attributed to the synergistic effect between both magnetic particles and carbon nanotube buckypaper on the shielding properties of the studied composites.</abstract>
		<area>FISMAT</area>
		<language>en</language>
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