Detalhes bibliográficos
| Resumo: | Particulate composite films of poly(vinylidene fluoride) and CoFe2O4 and NiFe2O4 ferrites were prepared from solvent casting and melt processing. The well dispersed ferrite nanoparticles nucleate the piezoelectric -phase of the polymer, but the different ferrites nucleate the whole polymer crystalline phase at different filler concentrations. The macroscopic magnetic and dielectric response of the composites demonstrates a strong dependence on the volume fraction of ferrite nanoparticles, with both magnetization and dielectric constant increasing for increasing filler content. The β-relaxation in the composite samples is similar to the one observed for -PVDF obtained by stretching. A superparamagnetic behavior was observed for NiFe2O4/PVDF composites, whereas CoFe2O4/PVDF samples develop a hysteresis cycle with coercivity of 0.3 T. |
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| Autores principais: | Martins, P. |
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| Outros Autores: | Costa, Carlos M.; Botelho, Gabriela; Lanceros-Méndez, S.; Barandiaran, J. M.; Gutierrez, J. |
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| Assunto: | Polymer composites Dielectric properties Magnetic properties Nucleation Composite materials |
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| Ano: | 2012 |
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| País: | Portugal |
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| Tipo de documento: | artigo |
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| Tipo de acesso: | acesso restrito |
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| Instituição associada: | Universidade do Minho |
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| Idioma: | inglês |
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| Origem: | RepositóriUM - Universidade do Minho |
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