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Abstract:

Magnetic elastic structured composites were prepared by using CoFe 2O4 ferromagnetic and superparamagnetic nanoparticles as fillers in polydimethylsiloxane (PDMS) matrixes, which were cured in the presence of a uniform magnetic field. Cobalt-iron oxide nanoparticles of three different average sizes (between 2 and 12 nm) were synthesized and characterized. The smallest nanoparticles presented superparamagnetic behavior, with a blocking temperature of approximately 75 K, while larger particles are already blocked at room temperature. Macroscopically structured-anisotropic PDMS-CoFe2O4 composites were obtained when curing the dispersion of the nanoparticles in the presence of a uniform magnetic field (0.3 T). The formation of the particle's chains (needles) orientated in the direction of the magnetic field was observed only when loading with the larger magnetically blocked nanoparticles. The SEM images show that the needles are formed by groups of nanoparticles which retain their original average size. The Young's moduli of the structured composites are four times larger when measured along the oriented needles than in the perpendicular direction. Magnetization (VSM) and ferromagnetic resonance curves of the structured composites were determined as a function of the relative orientation between the needles and the probe field. The remanence magnetization was 30 higher when measured parallel to the needles, while the coercive field remains isotropic. These observations are discussed in terms of the individual nanoparticle's properties and its aggregation in the composites. © 2011 American Institute of Physics.

Registro:

Documento: Artículo
Título:Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites
Autor:Soledad Antonel, P.; Jorge, G.; Perez, O.E.; Butera, A.; Gabriela Leyva, A.; Martín Negri, R.
Filiación:Instituto de Química Física de Materiales, Ambiente y Energa (INQUIMAE), Departamento de Química Inorgnica, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
Centro Atmico Bariloche (Comisin Nacional de Energa Atmica. Argentina), Instituto Balseiro, Universidad Nacional de Cuyo, Bariloche, Ro Negro, Argentina
Departamento de Física de la Materia Condensada. Gerencia de Investigacin y Aplicaciones, Centro Atmico Constituyentes, Comisin Nacional de Energa Atmica and Escuela de Ciencia y Tecnologa, Argentina
Palabras clave:Average size; Blocking temperature; Coercive field; Elastic properties; matrix; Oxide nanoparticles; Polydimethylsiloxane PDMS; Probe field; Relative orientation; Room temperature; SEM image; Superparamagnetic behavior; Superparamagnetic nanoparticles; Young's Modulus; Cobalt; Curing; Elasticity; Ferromagnetic materials; Ferromagnetism; Iron oxides; Magnetic fields; Magnetization; Microchannels; Nanocomposites; Nanoparticles; Needles; Remanence; Silicones; Superparamagnetism; Nanomagnetics
Año:2011
Volumen:110
Número:4
DOI: http://dx.doi.org/10.1063/1.3624602
Título revista:Journal of Applied Physics
Título revista abreviado:J Appl Phys
ISSN:00218979
CODEN:JAPIA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00218979_v110_n4_p_SoledadAntonel.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v110_n4_p_SoledadAntonel

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Citas:

---------- APA ----------
Soledad Antonel, P., Jorge, G., Perez, O.E., Butera, A., Gabriela Leyva, A. & Martín Negri, R. (2011) . Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites. Journal of Applied Physics, 110(4).
http://dx.doi.org/10.1063/1.3624602
---------- CHICAGO ----------
Soledad Antonel, P., Jorge, G., Perez, O.E., Butera, A., Gabriela Leyva, A., Martín Negri, R. "Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites" . Journal of Applied Physics 110, no. 4 (2011).
http://dx.doi.org/10.1063/1.3624602
---------- MLA ----------
Soledad Antonel, P., Jorge, G., Perez, O.E., Butera, A., Gabriela Leyva, A., Martín Negri, R. "Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites" . Journal of Applied Physics, vol. 110, no. 4, 2011.
http://dx.doi.org/10.1063/1.3624602
---------- VANCOUVER ----------
Soledad Antonel, P., Jorge, G., Perez, O.E., Butera, A., Gabriela Leyva, A., Martín Negri, R. Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites. J Appl Phys. 2011;110(4).
http://dx.doi.org/10.1063/1.3624602