Novel method for synthesis of Fe core and C shell magnetic nanoparticles

Chaudhary, Rakesh P.; Mohanty, Samarendra; Köymen, A. R.

doi:10.1016/j.carbon.2014.07.043

Cited by 28 publications

(11 citation statements)

References 31 publications

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“…Many advances to synthesize magnetic nanostructures have been made using a variety of chemical and physical approaches. [12][13][14][15][16] A number of efforts have been made to increase coercivity in cobalt ferrite. The maximum coercivity of 9.3 kOe at room temperature reported to date in thin films deposited on SiO 2 single crystal substrate that was due to the small grain size (50 nm) and lattice strain in the films.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of CoFe2O4 nanoparticles with high coercivity

Gandha

Elkins

Poudyal

et al. 2015

Journal of Applied Physics

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Articles you may be interested inSynthesis and magnetic properties of size-tunable Mn x Fe3− x O4 ferrite nanoclusters Size effects on structural and magnetic properties of CoFe2O4 nanoparticles prepared by co-precipitation method AIP Conf.Single crystalline CoFe 2 O 4 nanoparticles with high coercivity were prepared via a one-step hydrothermal method. The shape and size of the nanocrystals (in the range of 20-100 nm) can be controlled by varying synthesis parameters such as the concentration of NaOH and CTAB. X-ray diffraction and Raman spectra analysis confirmed that all the as-synthesized nanoparticles have a face centered cubic spinel crystal structure. HRTEM observation of particles shows interlayer spacing 0.48 nm of (111) lattice planes. A coercive force up to 5.0 kOe and saturation magnetization of 73 emu/g was achieved at room temperature for the 40 nm CoFe 2 O 4 nanoparticles. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of CoFe2O4 nanoparticles with high coercivity

Gandha

Elkins

Poudyal

et al. 2015

Journal of Applied Physics

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“…The collapse of cavitation bubbles in a strong electric field between Fe electrodes polarizes the π-electrons in toluene and thus creates plasma. Quasi-stable nanoparticles are formed when energetic plasma encounters electrodes either by nucleation in the vapor or molten Fe, and then after the rapid quenching, stable nanoparticles are formed [ 26 , 27 ]. The Plasma breaks toluene, and the C species are catalytically decomposed into C atoms.…”

Section: Methodsmentioning

confidence: 99%

Fe Core–Carbon Shell Nanoparticles as Advanced MRI Contrast Enhancer

Chaudhary

Kangasniemi

Takahashi

et al. 2017

JFB

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The aim of this study is to fabricate a hybrid composite of iron (Fe) core–carbon (C) shell nanoparticles with enhanced magnetic properties for contrast enhancement in magnetic resonance imaging (MRI). These new classes of magnetic core–shell nanoparticles are synthesized using a one-step top–down approach through the electric plasma discharge generated in the cavitation field in organic solvents by an ultrasonic horn. Transmission electron microscopy (TEM) observations revealed the core–shell nanoparticles with 10–85 nm in diameter with excellent dispersibility in water without any agglomeration. TEM showed the structural confirmation of Fe nanoparticles with body centered cubic (bcc) crystal structure. Magnetic multi-functional hybrid composites of Fe core–C shell nanoparticles were then evaluated as negative MRI contrast agents, displaying remarkably high transverse relaxivity (r2) of 70 mM−1·S−1 at 7 T. This simple one-step synthesis procedure is highly versatile and produces desired nanoparticles with high efficacy as MRI contrast agents and potential utility in other biomedical applications.

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“…The synthesis of nanoparticles was continued for an hour. The liquid turned uniformly black, nanoparticles dispersed in the toluene were later separated by centrifugation, washed with toluene and dried in an oven at 318 K. In our recent work, we have demonstrated this method as a new route to synthesize various nanoparticles [25,26].…”

Section: Methodsmentioning

confidence: 99%