Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites
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...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v110_n4_p_SoledadAntonel http://hdl.handle.net/20.500.12110/paper_00218979_v110_n4_p_SoledadAntonel |
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paper:paper_00218979_v110_n4_p_SoledadAntonel2023-06-08T14:42:49Z Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites Antonel, Paula Soledad Jorge, Guillermo Antonio Pérez, Oscar E. Negri, Ricardo Martin 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 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. Fil:Soledad Antonel, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Jorge, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Perez, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martín Negri, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v110_n4_p_SoledadAntonel http://hdl.handle.net/20.500.12110/paper_00218979_v110_n4_p_SoledadAntonel |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Antonel, Paula Soledad Jorge, Guillermo Antonio Pérez, Oscar E. Negri, Ricardo Martin Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites |
| topic_facet |
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 |
| description |
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. |
| author |
Antonel, Paula Soledad Jorge, Guillermo Antonio Pérez, Oscar E. Negri, Ricardo Martin |
| author_facet |
Antonel, Paula Soledad Jorge, Guillermo Antonio Pérez, Oscar E. Negri, Ricardo Martin |
| author_sort |
Antonel, Paula Soledad |
| title |
Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites |
| title_short |
Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites |
| title_full |
Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites |
| title_fullStr |
Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites |
| title_full_unstemmed |
Magnetic and elastic properties of CoFe2O4- polydimethylsiloxane magnetically oriented elastomer nanocomposites |
| title_sort |
magnetic and elastic properties of cofe2o4- polydimethylsiloxane magnetically oriented elastomer nanocomposites |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v110_n4_p_SoledadAntonel http://hdl.handle.net/20.500.12110/paper_00218979_v110_n4_p_SoledadAntonel |
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AT antonelpaulasoledad magneticandelasticpropertiesofcofe2o4polydimethylsiloxanemagneticallyorientedelastomernanocomposites AT jorgeguillermoantonio magneticandelasticpropertiesofcofe2o4polydimethylsiloxanemagneticallyorientedelastomernanocomposites AT perezoscare magneticandelasticpropertiesofcofe2o4polydimethylsiloxanemagneticallyorientedelastomernanocomposites AT negriricardomartin magneticandelasticpropertiesofcofe2o4polydimethylsiloxanemagneticallyorientedelastomernanocomposites |
| _version_ |
1768543405157122048 |