Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods
Magnetic CoFe<inf>2</inf>O<inf>4</inf> nanotubes, nanorods and nanowires were synthesized by the template method. The materials are highly crystalline and formed by compactly packed ceramic particles whose equivalent size diameter depends on the nanostructure type. Nanotubes...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_13880764_v17_n7_p_Antonel |
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todo:paper_13880764_v17_n7_p_Antonel2023-10-03T16:12:35Z Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods Antonel, P.S. Oliveira, C.L.P. Jorge, G.A. Perez, O.E. Leyva, A.G. Negri, R.M. Magnetic composites Magnetic nanorods Magnetic nanotubes Structured elastomers Anisotropy Chains Coercive force Crystallite size Curing Elastomers Fillers Magnetic fields Magnetism Nanoparticles Nanorods Nanostructures Nanotubes Nanowires Plastics Saturation magnetization Silicones Yarn Anisotropic structure Elastomer composites Magnetic composites Magnetic nanorod Magnetic nanotubes Polydimethylsiloxane elastomers Synthesis and characterizations Uniform magnetic fields Magnetic anisotropy dimeticone elastomer magnetic cobalt ferrite nanorod magnetic cobalt ferrite nanotube magnetic cobalt ferrite nanowire magnetic nanoparticle unclassified drug anisotropy Article chemical structure concentration (parameters) controlled study magnetic field particle size priority journal synthesis Magnetic CoFe<inf>2</inf>O<inf>4</inf> nanotubes, nanorods and nanowires were synthesized by the template method. The materials are highly crystalline and formed by compactly packed ceramic particles whose equivalent size diameter depends on the nanostructure type. Nanotubes and nanorods present the remarkable characteristic of having very large coercive fields (1000–1100 Oe) in comparison with nanoparticles of the same crystallite size (400 Oe) while keeping similar saturation magnetization (53–55 emu/g). Nanorods were used as filler material in polydimethylsiloxane elastomer composites, which were structured by curing in the presence of uniform magnetic field, H<inf>curing</inf>. In that way the nanorods agglomerate in the cured elastomer, forming needles-like structures (pseudo-chains) oriented in the direction of H<inf>curing</inf>. SEM analysis show that pseudo-chains are formed by bunches of nanorods oriented in that direction. At the considered filler concentration (1 % w/w), the structured elastomers conserve the magnetic properties of the fillers, that is, high coercive fields without observing magnetic anisotropy. The elastomer composites present strong elastic anisotropy, with compression constants about ten times larger in the direction parallel to the pseudo-chains than in the perpendicular direction, as determined by compression stress–strain curves. That anisotropic factor is about three-four times higher than that observed when using spherical CoFe<inf>2</inf>O<inf>4</inf> nanoparticles or elongated Ni nanochains. Hence, the use of morphological anisotropic structures (nanorods) results in composites with enhanced elastic anisotropy. It is also remarkable that the large elastic anisotropy was obtained at lower filler concentration compared with the above-mentioned systems (1 % w/w vs. 5–10 % w/w). © 2015, Springer Science+Business Media Dordrecht. Fil:Antonel, P.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Jorge, G.A. 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:Negri, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13880764_v17_n7_p_Antonel |
| institution |
Universidad de Buenos Aires |
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I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Magnetic composites Magnetic nanorods Magnetic nanotubes Structured elastomers Anisotropy Chains Coercive force Crystallite size Curing Elastomers Fillers Magnetic fields Magnetism Nanoparticles Nanorods Nanostructures Nanotubes Nanowires Plastics Saturation magnetization Silicones Yarn Anisotropic structure Elastomer composites Magnetic composites Magnetic nanorod Magnetic nanotubes Polydimethylsiloxane elastomers Synthesis and characterizations Uniform magnetic fields Magnetic anisotropy dimeticone elastomer magnetic cobalt ferrite nanorod magnetic cobalt ferrite nanotube magnetic cobalt ferrite nanowire magnetic nanoparticle unclassified drug anisotropy Article chemical structure concentration (parameters) controlled study magnetic field particle size priority journal synthesis |
| spellingShingle |
Magnetic composites Magnetic nanorods Magnetic nanotubes Structured elastomers Anisotropy Chains Coercive force Crystallite size Curing Elastomers Fillers Magnetic fields Magnetism Nanoparticles Nanorods Nanostructures Nanotubes Nanowires Plastics Saturation magnetization Silicones Yarn Anisotropic structure Elastomer composites Magnetic composites Magnetic nanorod Magnetic nanotubes Polydimethylsiloxane elastomers Synthesis and characterizations Uniform magnetic fields Magnetic anisotropy dimeticone elastomer magnetic cobalt ferrite nanorod magnetic cobalt ferrite nanotube magnetic cobalt ferrite nanowire magnetic nanoparticle unclassified drug anisotropy Article chemical structure concentration (parameters) controlled study magnetic field particle size priority journal synthesis Antonel, P.S. Oliveira, C.L.P. Jorge, G.A. Perez, O.E. Leyva, A.G. Negri, R.M. Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods |
| topic_facet |
Magnetic composites Magnetic nanorods Magnetic nanotubes Structured elastomers Anisotropy Chains Coercive force Crystallite size Curing Elastomers Fillers Magnetic fields Magnetism Nanoparticles Nanorods Nanostructures Nanotubes Nanowires Plastics Saturation magnetization Silicones Yarn Anisotropic structure Elastomer composites Magnetic composites Magnetic nanorod Magnetic nanotubes Polydimethylsiloxane elastomers Synthesis and characterizations Uniform magnetic fields Magnetic anisotropy dimeticone elastomer magnetic cobalt ferrite nanorod magnetic cobalt ferrite nanotube magnetic cobalt ferrite nanowire magnetic nanoparticle unclassified drug anisotropy Article chemical structure concentration (parameters) controlled study magnetic field particle size priority journal synthesis |
| description |
Magnetic CoFe<inf>2</inf>O<inf>4</inf> nanotubes, nanorods and nanowires were synthesized by the template method. The materials are highly crystalline and formed by compactly packed ceramic particles whose equivalent size diameter depends on the nanostructure type. Nanotubes and nanorods present the remarkable characteristic of having very large coercive fields (1000–1100 Oe) in comparison with nanoparticles of the same crystallite size (400 Oe) while keeping similar saturation magnetization (53–55 emu/g). Nanorods were used as filler material in polydimethylsiloxane elastomer composites, which were structured by curing in the presence of uniform magnetic field, H<inf>curing</inf>. In that way the nanorods agglomerate in the cured elastomer, forming needles-like structures (pseudo-chains) oriented in the direction of H<inf>curing</inf>. SEM analysis show that pseudo-chains are formed by bunches of nanorods oriented in that direction. At the considered filler concentration (1 % w/w), the structured elastomers conserve the magnetic properties of the fillers, that is, high coercive fields without observing magnetic anisotropy. The elastomer composites present strong elastic anisotropy, with compression constants about ten times larger in the direction parallel to the pseudo-chains than in the perpendicular direction, as determined by compression stress–strain curves. That anisotropic factor is about three-four times higher than that observed when using spherical CoFe<inf>2</inf>O<inf>4</inf> nanoparticles or elongated Ni nanochains. Hence, the use of morphological anisotropic structures (nanorods) results in composites with enhanced elastic anisotropy. It is also remarkable that the large elastic anisotropy was obtained at lower filler concentration compared with the above-mentioned systems (1 % w/w vs. 5–10 % w/w). © 2015, Springer Science+Business Media Dordrecht. |
| format |
JOUR |
| author |
Antonel, P.S. Oliveira, C.L.P. Jorge, G.A. Perez, O.E. Leyva, A.G. Negri, R.M. |
| author_facet |
Antonel, P.S. Oliveira, C.L.P. Jorge, G.A. Perez, O.E. Leyva, A.G. Negri, R.M. |
| author_sort |
Antonel, P.S. |
| title |
Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods |
| title_short |
Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods |
| title_full |
Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods |
| title_fullStr |
Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods |
| title_full_unstemmed |
Synthesis and characterization of CoFe<inf>2</inf>O<inf>4</inf> magnetic nanotubes, nanorods and nanowires. Formation of magnetic structured elastomers by magnetic field-induced alignment of CoFe<inf>2</inf>O<inf>4</inf> nanorods |
| title_sort |
synthesis and characterization of cofe<inf>2</inf>o<inf>4</inf> magnetic nanotubes, nanorods and nanowires. formation of magnetic structured elastomers by magnetic field-induced alignment of cofe<inf>2</inf>o<inf>4</inf> nanorods |
| url |
http://hdl.handle.net/20.500.12110/paper_13880764_v17_n7_p_Antonel |
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