Synthesis and characterization of magnetic nanocomposites with Fe<sub>3</sub>O<sub>4</sub>core

Chen, J; Wang, Y G; Li, Z Q; Wang, C; Li, J F; Gu, Yansong

doi:10.1088/1742-6596/152/1/012041

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…The numerical values of temperature were determined by averaging local temperatures in an area of 200 μm × 200 μm at the center of the signal line. In order to read the exact temperature of the magnetic nanoparticles, the parameter values for the calculation are as follows: infrared emissivity of Fe 3 O 4 nanoparticles 34 (very close to emissivity of black body, ), temperature of atmosphere T atm = 25 °C, distance from IR camera to sample D = 50 cm. We also measured the temperatures of ice and boiling water in order to confirm the calibration and accuracy (see Supplementary Section S2 ).…”

Section: Methodsmentioning

confidence: 99%

Ultra-high rate of temperature increment from superparamagnetic nanoparticles for highly efficient hyperthermia

Lee

Kim

et al. 2021

Sci Rep

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The magneto-thermal effect, which represents the conversion of magnetostatic energy to heat from magnetic materials, has been spotlighted for potential therapeutic usage in hyperthermia treatments. However, the realization of its potential has been challenged owing to the limited heating from the magnetic nanoparticles. Here, we explored a new-concept of magneto-thermal modality marked by low-power-driven, fast resonant spin-excitation followed by consequent energy dissipation, which concept has yet to be realized for current hyperthermia applications. We investigated the effect of spin resonance-mediated heat dissipation using superparamagnetic Fe3O4 nanoparticles and achieved an extraordinary initial temperature increment rate of more than 150 K/s, which is a significant increase in comparison to that for the conventional magnetic heat induction of nanoparticles. This work would offer highly efficient heat generation and precision wireless controllability for realization of magnetic-hyperthermia-based medical treatment.

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Section: Methodsmentioning

confidence: 99%

Ultra-high rate of temperature increment from superparamagnetic nanoparticles for highly efficient hyperthermia

Lee

Kim

et al. 2021

Sci Rep

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“…Wei et al prepared an Fe 3 Al composite using a mechanochemical method and coated Al 2 O 3 as an insulating layer on the surface of Fe 3 Al. The reflectivity value of this Fe 3 Al/Al 2 O 3 /Fe 3 Al absorbing coating was lower than −20 dB in the range from 7.2 to 17.4 GHz when the thickness of the Al 2 O 3 coating was 1.5-2.5 mm [9]. In general, the non-magnetic porous structure of Al 2 O 3 provides nucleation points for magnetic particles so that the magnetic particles can be highly dispersed.…”

Section: Introductionmentioning

confidence: 91%

Effect of Porous Structure on the Microwave Absorption Capacity of Soft Magnetic Connecting Network Ni/Al2O3/Ni Film

Cheng

Shchukin

2020

Materials

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Microwave radar absorbing materials have been the focus of the radar stealth research field. In this study, ceramic structured porous honeycomb-like Al2O3 film was prepared by anodic oxidation, and an Ni layer was deposited on the Al2O3 film via electrodeposition in a neutral environment to form a flower- and grain-like structure in a three-dimensional (3D) network Ni/Al2O3/Ni film. The films both have a through-hole internal structure, soft magnetic properties, and absorb microwaves. The dielectric loss values of two films were little changed, and the maximum microwave absorption values of flower- and grain-like Ni/Al2O3/Ni film were −45.3 and −31.05 dB with relatively wide effective bandwidths, respectively. The porous ceramic structure Al2O3 interlayer prevented the reunion of Ni and isolated the eddy current to improve the microwave absorption properties. The material presented in our paper has good microwave absorption performance with a thin thickness, which indicates the potential for lightweight and efficient microwave absorption applications.

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“…Surprisingly spectrum taken at a lower temperature shows some additional modes at 628 and 799 cm À1 , which corresponds to Fe-O stretching 15 and Si-O-Si symmetric stretching vibrations. 14,16 Among the observed modes due to the Fe 3 O 4 film, the T 1u mode observed at 560 cm À1 is the most intense mode, and we chose this mode to study its line shape parameters as we lower the temperature across Verwey transition temperature. Line shape parameters such as mode position and full width at half maximum (FWHM) provide information regarding any structural transition.…”

Section: -2mentioning

confidence: 99%

Infrared spectroscopic study of pulsed laser deposited Fe3O4 thin film on Si (111) substrate across Verwey transition temperature

Master

Tiwari

Choudhary

et al. 2011

Journal of Applied Physics

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We present low-temperature infrared measurements of magnetite (Fe 3 O 4 ) thin films on Si (111) substrate across the Verwey transition temperature (T V ). The line parameters of the most intense t 1u mode observed in the Fourier transform infra red spectrum of the film is studied as a function of temperature. We observe that mode frequency increases abruptly at 130 K, and full width at half maxima of the mode increases abruptly at 113 K. The observations point out that structural transition may start earlier at 130 K than the actual Verwey transition (121 K) and that complete at 113 K. These results are consistent with the higher transition temperature as observed in resistivity and magnetization measurements.

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Synthesis and characterization of magnetic nanocomposites with Fe₃O₄core

Cited by 13 publications

References 13 publications

Ultra-high rate of temperature increment from superparamagnetic nanoparticles for highly efficient hyperthermia

Ultra-high rate of temperature increment from superparamagnetic nanoparticles for highly efficient hyperthermia

Effect of Porous Structure on the Microwave Absorption Capacity of Soft Magnetic Connecting Network Ni/Al2O3/Ni Film

Infrared spectroscopic study of pulsed laser deposited Fe3O4 thin film on Si (111) substrate across Verwey transition temperature

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Synthesis and characterization of magnetic nanocomposites with Fe3O4core

Cited by 13 publications

References 13 publications

Ultra-high rate of temperature increment from superparamagnetic nanoparticles for highly efficient hyperthermia

Ultra-high rate of temperature increment from superparamagnetic nanoparticles for highly efficient hyperthermia

Effect of Porous Structure on the Microwave Absorption Capacity of Soft Magnetic Connecting Network Ni/Al2O3/Ni Film

Infrared spectroscopic study of pulsed laser deposited Fe3O4 thin film on Si (111) substrate across Verwey transition temperature

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Synthesis and characterization of magnetic nanocomposites with Fe₃O₄core