Field-induced microwave absorption in Fe3O4 nanoparticles and Fe3O4/polyaniline composites synthesized by different methods

Kurlyandskaya, G.V.; Cunanan, Jessica; Bhagat, S. M.; Aphesteguy, Juan Carlos; Jacobo, Silvia E.

doi:10.1016/j.jpcs.2007.03.031

Cited by 64 publications

(48 citation statements)

References 15 publications

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“…6,[17][18][19] Since the FMR lines are broad (as in all previous cases for MNPs) 13,18,19 it is not advisable to use the modulation technique. We would rather measure the microwave absorption (P) itself as a function of the applied field.…”

Section: Methodsmentioning

confidence: 98%

“…[1][2][3][4] Nanoparticles with controlled sizes and properties have been synthesized by different techniques [4][5][6] including natural magnetite MNPs obtained by biomineralization. 3 MNPs of iron oxides have been intensively studied on account of proven biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

“…3 MNPs of iron oxides have been intensively studied on account of proven biocompatibility. 2,[5][6][7] Also, many fundamental properties are very well known for materials of the same compositions in their bulk state. 8,9 For biological applications it is important to have spherical MNPs to ensure an intracellular up-take.…”

Section: Introductionmentioning

confidence: 99%

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Spherical magnetic nanoparticles fabricated by electric explosion of wire

et al. 2011

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We report the first use of an electrophysical method of electric explosion of wire for preparing magnetic nanoparticles of iron oxide. X-ray diffraction, transmission electron microscopy, magnetization and magnetic resonance measurements were comparatively analyzed. They indicated that the shape of magnetic nanoparticles is close to being spherical. The production order of 100g per hour by this method is advantageous when a large amount of material is needed for applications

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Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Spherical magnetic nanoparticles fabricated by electric explosion of wire

et al. 2011

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“…Since the magnetic property of spinel ferrites is associated with their morphology and size, modern data storage, microwave protection, and biomedical applications require strict control over the morphology of the particles and a considerable reduction in their dimensions to the single domain and superparamagnetic size [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Co_0.5Zn_0.5Fe₂O₄Nanoparticles Synthesized by a Template-Assisted Hydrothermal Method

2011

Journal of Nanotechnology

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In the present paper, nickel cobalt ferrite (Co 0.5 Zn 0.5 Fe 2 O 4 ) nanoparticles were synthesized using a template-assisted hydrothermal method. Carboxymethyl cellulose was used as the templating agent for controlling the morphology of the Co 0.5 Zn 0.5 Fe 2 O 4 nanoparticles. The synthesized nanoparticles were characterized using X-ray diffraction, scanning electron microscopy, and a vibrating sample magnetometer. The results indicated that the morphology of the nanoparticles changed from granular and superparamagnetic to platelike and ferromagnetic with the addition of the template. The Co 0.5 Zn 0.5 Fe 2 O 4 nanoparticles synthesized without the template exhibited a saturation magnetization and coercivity 2.81 T and 0.2 kA·m −1 , while when the template was used, the saturation magnetization and coercivity increased to 3.13 T and 76.6 kA·m −1 as the template proportion increased to 0.3.

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“…Polymeric materials decorated with inorganic nanoparticles are of particular interest because possible interactions between the inorganic nanoparticles and the polymer matrices may generate some unique physical properties upon the formation of various micro/nanocomposites [24][25][26][27]. Recently, interesting research has been focused on the polyaniline-inorganic nanocomposites to obtain the materials with synergetic or complementary behavior between polyaniline and inorganic nanoparticles [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Characterization of PEG-Mn3O4 Nanocomposite

et al. 2011

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Abstract:Here, we report on the synthesis of PEG-Mn3O4 nanocomposite (NP's) via a hydrothermal route by using Mn(acac)2, ethanol, NH3 and PEG-400. The crystalline phase was identified as Mn3O4. The crystallite size of the PEG-Mn3O4 nanocomposite was calculated as 12±5 nm from X-ray line profile fitting and the average particle size from TEM was obtained as 200 nm. This reveals polycrystalline character of Mn3O4 NP's. The interaction between PEG-400 and the Mn3O4 NP's was investigated by FTIR. Temperature independent AC conductivity of PEG-Mn3O4 nanocomposite beyond 20 kHz provides a strong evidence of ionic conduction through the structure. The conductivity and permittivity measurements strongly depend on the secondary thermal transition of nanocomposite beyond 100℃. Above that temperature, Mn3O4 particles may interact with each other yielding a percolated path that will facilitate the conduction. On the other hand, the relatively lower activation energy (Ea=0.172 eV) for relaxation process suggests that polymer segmental motions of PEG and electrons hopping between Mn 2+ and Mn 3+ may be coupled in the sample below 100℃. Room temperature magnetization curve of the sample does not reach to a saturation, which indicates the superparamagnetic character of the particles. As the temperature increases, the frequency at which (ε ) reaches a maximum shifted towards higher frequencies. The maximum peak was observed at 1.4 kHz for 20℃ while the maximum was detected at 23.2 kHz for 90℃.

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Field-induced microwave absorption in Fe3O4 nanoparticles and Fe3O4/polyaniline composites synthesized by different methods

Cited by 64 publications

References 15 publications

Spherical magnetic nanoparticles fabricated by electric explosion of wire

Spherical magnetic nanoparticles fabricated by electric explosion of wire

Magnetic Properties of Co_0.5Zn_0.5Fe₂O₄Nanoparticles Synthesized by a Template-Assisted Hydrothermal Method

Hydrothermal Synthesis and Characterization of PEG-Mn3O4 Nanocomposite

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Field-induced microwave absorption in Fe3O4 nanoparticles and Fe3O4/polyaniline composites synthesized by different methods

Cited by 64 publications

References 15 publications

Spherical magnetic nanoparticles fabricated by electric explosion of wire

Spherical magnetic nanoparticles fabricated by electric explosion of wire

Magnetic Properties of Co0.5Zn0.5Fe2O4Nanoparticles Synthesized by a Template-Assisted Hydrothermal Method

Hydrothermal Synthesis and Characterization of PEG-Mn3O4 Nanocomposite

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Product

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Magnetic Properties of Co_0.5Zn_0.5Fe₂O₄Nanoparticles Synthesized by a Template-Assisted Hydrothermal Method