Soft-Chemical Synthetic Route to Superparamagnetic FeAs@C Core–Shell Nanoparticles Exhibiting High Blocking Temperature

2013 ◽  
Vol 25 (9) ◽  
pp. 1510-1518 ◽  
Author(s):  
Prachi Desai ◽  
Kai Song ◽  
Jakub Koza ◽  
Akshay Pariti ◽  
Manashi Nath
Keyword(s):  
Blocking Temperature ◽  
Core Shell ◽  
Synthetic Route ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

A facile synthetic route to convert Tb(iii) complexes of novel tetra-1,3-diketone calix[4]resorcinarene into hydrophilic luminescent colloids

2014 ◽  
Vol 38 (9) ◽  
pp. 4130-4140 ◽  
Author(s):  
Nataliya A. Shamsutdinova ◽  
Sergey N. Podyachev ◽  
Svetlana N. Sudakova ◽  
Asiya R. Mustafina ◽  
Rustem R. Zairov ◽  
...  
Keyword(s):  
Core Shell ◽  
Synthetic Route ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles ◽  
Deposition Techniques

Luminescent hydrophilic core–shell nanoparticles are synthesized through reprecipitation and polyelectrolyte deposition techniques from Tb(iii) complexes.

Effect of shell thickness on the exchange bias blocking temperature and coercivity in Co-CoO core-shell nanoparticles

2017 ◽  
Vol 122 (6) ◽  
pp. 063902 ◽  
Author(s):  
S. Thomas ◽  
K. Reethu ◽  
T. Thanveer ◽  
M. T. Z. Myint ◽  
S. H. Al-Harthi
Keyword(s):  
Exchange Bias ◽  
Shell Thickness ◽  
Blocking Temperature ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Dependence of Relaxation Time on the Core Size Two-Phase Nanoparticles Magnetite/Titanomagnetite

2015 ◽  
Vol 752-753 ◽  
pp. 418-421
Author(s):  
Ilia Iliushin ◽  
Leonid Afremov ◽  
Sergey Anisimov
Keyword(s):  
Relaxation Time ◽  
Blocking Temperature ◽  
Exchange Constant ◽  
Core Shell ◽  
Core Size ◽  
Shell Nanoparticles ◽  
Two Phase ◽  
The Core ◽  
Core Shell Nanoparticles ◽  
Model Nanoparticles

In this paper, depending of the blocking temperature on magnetite core size for core/shell nanoparticles has been carried out using our theoretical model. Nanoparticles has size of 100nm, and magnetite core increases from 0nm to 100nm. Systems were studied with different values of exchange constant. The data obtained indicate that exchange constant increases the blocking temperature. However, the sign of the constant does not matter.

Magnetic Behaviour of FeCo/Cu Core Shell Nanoparticles

2016 ◽  
Vol 719 ◽  
pp. 3-8
Author(s):  
Angshuman Sarkar ◽  
Shilabati Hembram ◽  
Subhranshu Chatterjee ◽  
Pritam Deb ◽  
Amitava Basu Mallick
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Field Enhancement ◽  
Blocking Temperature ◽  
Core Shell ◽  
Line Profile Analysis ◽  
Shell Nanoparticles ◽  
X Ray ◽  
The Core ◽  
Core Shell Nanoparticles

In the present investigation, FeCo/Cu core shell nanoparticles were prepared by coating a Cu layer over FeCo alloy nanoparticles through displacement reaction. X-ray diffraction studies confirmed the presence of FeCo and Cu phases in the sample. The grain size and lattice strains of the core shell nanostructures were evaluated from the x-ray profiles by using single line profile analysis technique. The effect of annealing temperature on the magnetic properties of the core shell nanoparticles was studied by using a vibrating sample magnetometer. The results showed that the magnetic properties improve significantly after annealing the compacts of core shell nanoparticles under a magnetic field. Enhancement in magnetization was observed in the compacts with the increase in annealing temperature. Highest saturation magnetization value of 56 emu/g was recorded in the sample which was annealed at 600°C. It has been also found that the blocking temperature of the core shell nanoparticles increases with the increase in annealing temperature.

Synthesis and Characterization of Co3O4-MnxCo3-xO4 Core-Shell Nanoparticles

MRS Advances ◽  
2018 ◽  
Vol 3 (47-48) ◽  
pp. 2899-2904
Author(s):  
Ning Bian ◽  
Robert A. Mayanovic ◽  
Mourad Benamara
Keyword(s):  
Electron Microscopy ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Blocking Temperature ◽  
Core Shell ◽  
Average Particle ◽  
Shell Nanoparticles ◽  
X Ray ◽  
The Core ◽  
Core Shell Nanoparticles

ABSTRACTThe mixed-valence oxide Co3O4 nanoparticles, having the normal spinel structure, possess large surface area, active-site surface adsorption properties, and fast ion diffusivities. Consequently, they are widely used in lithium-ion batteries, as well as for gas sensing and heterogeneous catalysis applications. In our research, we use a two-step method to synthesize Co3O4–based core-shell nanoparticles (CSNs). Cobalt oxide (Co3O4) nanoparticles were successfully synthesized using a wet synthesis method employing KOH and cobalt acetate. Manganese was incorporated into the Co3O4 structure to synthesize inverted Co3O4@MnxCo3-xO4 CSNs using a hydrothermal method. By adjustment of pH value, we obtained two different morphologies of CSNs, one resulting in pseudo-spherical and octahedron-shaped nanoparticles (PS type) whereas the second type predominantly have a nanoplate (NP type) morphology. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and x-ray photoelectron spectroscopy (XPS) have been performed in order to determine the morphological and structural properties of our CSNs, whereas the magnetic properties have been characterized using a superconducting quantum interference device (SQUID) magnetometer. XRD and TEM results show that the CSNs have the same spinel crystal structure throughout the core and shell with an average particle size of ∼19.8 nm. Our Co3O4 nanoparticles, as measured prior to CSN formation, are shown to be antiferromagnetic (AFM) in nature as shown by the magnetization data. Our SQUID data indicate that the core-shell nanoparticles have both AFM (due to the Co3O4 core) and ferrimagnetic properties (of the shell) with a coercivity field of 300 Oe and 150 Oe at 5 K for the PS and NP samples, respectively. The magnetization vs temperature data show a spin order-disorder transition at ∼33 K and a superparamagnetic blocking temperature of ∼90 K for both batches.

scholarly journals Blocking Temperature of the System Core-Shell Nanoparticles

2014 ◽  
Vol 887-888 ◽  
pp. 167-169
Author(s):  
Leonid L. Afremov ◽  
Ilia G. Iliushin ◽  
Sergey Anisimov
Keyword(s):  
Blocking Temperature ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Blocking Temperature of a System of Core/Shell Nanoparticles

2020 ◽  
Vol 312 ◽  
pp. 270-274
Author(s):  
Leonid Lazarevich Afremov ◽  
Sergei Anisimov ◽  
Ilia Iliushin
Keyword(s):  
Theoretical Study ◽  
Blocking Temperature ◽  
Core Shell ◽  
Magnetostatic Interaction ◽  
Shell Nanoparticles ◽  
Shell System ◽  
The Core ◽  
Core Shell Nanoparticles

A theoretical study was made of the dependence of the blocking temperature of the core/shell system of nanoparticles on the intensity of their magnetostatic interaction. It is shown that with an increase in the concentration of nanoparticles (intensity of the magnetostatic interaction), the blocking temperature increases. Moreover, the of large nanoparticles changes more significantly.

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