Preparation of Superparamagnetic Cobalt Ferrite Nanoparticles with High Saturation Magnetization by Temperature-Controlled Co-Precipitation Method

2021 ◽  
Vol 68 ◽  
pp. 91-102
Author(s):  
Duong Hong Quyen ◽  
Nguyen Quang Hung ◽  
Hoang Thi Kieu Nguyen
Keyword(s):  
Saturation Magnetization ◽  
Cobalt Ferrite ◽  
Magnetic Measurements ◽  
Average Particle Size ◽  
Ferrite Nanoparticles ◽  
Precipitation Method ◽  
Average Particle ◽  
Cobalt Ferrite Nanoparticles ◽  
Preparation Conditions ◽  
Ferrite Particle

In this study, the effect of reaction temperature on the properties of cobalt ferrite nanoparticles was investigated. X-ray diffraction analysis and Fourier transform infrared spectroscopy confirmed that synthesized nanoparticles are cobalt ferrite. Particle sizes and shapes were determined by a transmission electron microscope, and magnetic measurements were done using a vibrating sample magnetometer. The average particle size varies in the range of 5.7 - 10.7 nm as the temperature is raised from 30 to 80°C. With that, there is a transition from ferrimagnetic to superparamagnetic behaviors at 40°C. The critical size of cobalt ferrite nanoparticles for the superparamagnetic limit with zero coercivity is found to be around 6 nm, and its saturation magnetization value is 25.4 emu/g. This value is impressive higher compared to that in the other studies with similar preparation conditions.

Synthesis and Characterization of Co0.6Zn0.4Mn0.3Fe1.7O4 Magnetic Nanoparticles

2014 ◽  
Vol 1708 ◽  
Author(s):  
Arti Gupta ◽  
R. P. Tandon
Keyword(s):  
Magnetic Nanoparticles ◽  
Thermal Annealing ◽  
Cobalt Ferrite ◽  
Magnetic Measurements ◽  
Spinel Ferrite ◽  
Average Particle Size ◽  
Medical Diagnostics ◽  
Precipitation Method ◽  
Average Particle ◽  
Research Attention

ABSTRACTIn the recent time spinel ferrite magnetic nanoparticles have been largely studied owing to various applications of these materials in the information storage, ferro-fluid technology, magnetocaloric effect, refrigeration and medical diagnostics. In this category cobalt ferrite (CoFe2O4) nanoparticles specifically gained huge research attention and prepared by various chemical methods. However, further investigations are still needed on the substituted CoFe2O4 (CFO) nanoparticles to explore their various characteristics. In this paper we present our results on Mn and Zn substituted cobalt ferrite (Co0.6Zn0.4Mn0.3Fe1.7O4 ) nanoparticles prepared by chemical co precipitation method. The x ray diffraction pattern of as prepared Co0.6Zn0.4Mn0.3Fe1.7O4 (CZFMO) nanoparticles indicated their average particle size =20 nm. Magnetic properties of these nanoparticles before and after thermal annealing have been compared. Magnetization (M) vs. field (H) loop measurements at T = 293 K on as prepared and thermally annealed CZFMO nano powders revealed an unusual feature contrary to CFO nanoparticles prepared under same conditions. The saturation magnetization (Ms) decreases after the thermal annealing unlike the usual increase in Ms observed for CFO nanoparticles. These nano sized CZFMO powder samples are further characterized by low temperature magnetic measurements; Raman spectroscopy and Fourier transform infrared spectroscopy.

Nonmetal sulfur-doped coral-like cobalt ferrite nanoparticles with enhanced magnetic properties

2016 ◽  
Vol 4 (5) ◽  
pp. 951-957 ◽  
Author(s):  
Derang Cao ◽  
Xicheng Wang ◽  
Lining Pan ◽  
Hao Li ◽  
Panpan Jing ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Cobalt Ferrite ◽  
Ferrite Nanoparticles ◽  
Cobalt Ferrite Nanoparticles

The saturation magnetization of sulfur-doped coral-like cobalt ferrite nanoparticles was improved to 81 emu g−1via a facile and novel calcining process.

scholarly journals Synthesis and Characterization of a Core-shell Material Using YBa2Cu3O7-d and Cobalt Ferrite Nanoparticles

2019 ◽  
Vol 69 (12) ◽  
pp. 3345-3348
Author(s):  
Maria Colie ◽  
Dan Eduard Mihaiescu ◽  
Daniela Istrati ◽  
Adrian Vasile Surdu ◽  
Bogdan Vasile ◽  
...  
Keyword(s):  
Cobalt Ferrite ◽  
Nanostructured Material ◽  
Ferrite Nanoparticles ◽  
Precipitation Method ◽  
Core Shell ◽  
Shell Material ◽  
X Ray ◽  
Cobalt Ferrite Nanoparticles ◽  
Transmission Electron ◽  
Co Precipitation

In this paper we describe the synthesis of a core-shell material using yttrium superconducting ceramic material (YBCO) and cobalt ferrite nanoparticles in order to obtain a nanostructured material with magnetic properties. The advantages of such material aim the selective deposition of nanofilms oriented in magnetic fields. To obtain this core-shell material, the solutions of the nitrates were first obtained by dissolving the salts in demineralised water. The suspension with cobalt ferrite nanoparticles was obtained by co-precipitation method. To obtain YBa2Cu3O7-�- coated magnetic nanoparticles by autocombustion reaction the solutions of nitrates and citric acid were used. The ratio of the metal ions: Y:Ba:Cu was 1:2:3, and between the oxidant and the reducing agent was used a citrate / nitrate mass ratio equal with 0.7. The final material was analyzed by X-ray diffraction (XRD), electronic scanning microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), high resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer (VSM).

Preparation of Nanostructured Metal Ferrite Particles by Sonochemistry

2005 ◽  
Vol 277-279 ◽  
pp. 1044-1048 ◽  
Author(s):  
Eun Hee Kim ◽  
Hyo Sook Lee ◽  
Hui Ping Shao
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Cobalt Ferrite ◽  
Average Particle Size ◽  
Iron Chloride ◽  
Precipitation Method ◽  
Average Particle ◽  
Sonochemical Method ◽  
Iron Ferrite ◽  
Co Precipitation

Nanostructured iron and cobalt ferrite particles were prepared from iron chloride and cobalt chloride, respectively, using the sonochemical method. The particles were compared with those synthesized using the co-precipitation method. The properties of the particles were characterized using various techniques, such as XRD, TEM, VSM and a SQUID magnetometer. The iron ferrite particles had an average particle size of about 15 nm and a magnetization value of 83 emu/g at a magnetic field of 50 kOe, while the particle size of cobalt ferrite was about 5 nm and its magnetization value was 33 emu/g at the same magnetic field.

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