scholarly journals Synthesis of Magnetic Ferrite Nanoparticles with High Hyperthermia Performance via a Controlled Co-Precipitation Method

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1176 ◽  
Author(s):  
Darwish ◽  
Kim ◽  
Lee ◽  
Ryu ◽  
Lee ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Metal Content ◽  
Cobalt Ferrite ◽  
Ferrite Nanoparticles ◽  
Precipitation Method ◽  
Maximum Temperature ◽  
Cancer Treatments ◽  
Prepared Nanoparticles ◽  
Co Precipitation

Magnetic nanoparticles (MNPs) that exhibit high specific loss power (SLP) at lower metal content are highly desirable for hyperthermia applications. The conventional co-precipitation process has been widely employed for the synthesis of magnetic nanoparticles. However, their hyperthermia performance is often insufficient, which is considered as the main challenge to the development of practicable cancer treatments. In particular, ferrite MNPs have unique properties, such as a strong magnetocrystalline anisotropy, high coercivity, and moderate saturation magnetization, however their hyperthermia performance needs to be further improved. In this study, cobalt ferrite (CoFe2O4) and zinc cobalt ferrite nanoparticles (ZnCoFe2O4) were prepared to achieve high SLP values by modifying the conventional co-precipitation method. Our modified method, which allows for precursor material compositions (molar ratio of Fe+3:Fe+2:Co+2/Zn+2 of 3:2:1), is a simple, environmentally friendly, and low temperature process carried out in air at a maximum temperature of 60 °C, without the need for oxidizing or coating agents. The particles produced were characterized using multiple techniques, such as X-ray diffraction (XRD), dynamic light scattering (DLS), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV–Vis spectroscopy), and a vibrating sample magnetometer (VSM). SLP values of the prepared nanoparticles were carefully evaluated as a function of time, magnetic field strength (30, 40, and 50 kA m−1), and the viscosity of the medium (water and glycerol), and compared to commercial magnetic nanoparticle materials under the same conditions. The cytotoxicity of the prepared nanoparticles by in vitro culture with NIH-3T3 fibroblasts exhibited good cytocompatibility up to 0.5 mg/mL. The safety limit of magnetic field parameters for SLP was tested. It did not exceed the 5 × 109 Am−1 s−1 threshold. A saturation temperature of 45 °C could be achieved. These nanoparticles, with minimal metal content, can ideally be used for in vivo hyperthermia applications, such as cancer treatments.

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.

Magnetic Properties and Microstructures of Polyethylene Glycol (PEG)-Coated Cobalt Ferrite (CoFe2O4) Nanoparticles Synthesized by Coprecipitation Method

2014 ◽  
Vol 896 ◽  
pp. 126-133 ◽  
Author(s):  
Edi Suharyadi ◽  
Eko Arief Setiadi ◽  
Nanda Shabrina ◽  
Takeshi Kato ◽  
Satoshi Iwata
Keyword(s):  
Grain Size ◽  
Polyethylene Glycol ◽  
Magnetic Nanoparticles ◽  
Cobalt Ferrite ◽  
Synthesis Temperature ◽  
Precipitation Method ◽  
Magnetic Characterization ◽  
Tem Analysis ◽  
Peg 4000 ◽  
Co Precipitation

Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by co-precipitation method with various synthesis temperatures, concentration of NaOH and stirring duration. The results showed that nanoparticles have well crystallized structure with various grain sizes which depend on synthesis parameters. The grain size increased with increasing synthesis temperature, decreasing concentration of NaOH and decreasing stirring duration. Magnetic characterization of CoFe2O4 nanoparticles measured by Vibrating Sample Magnetometer (VSM) showed that coercive field was decrease with the decreasing of particle size. The saturation and remnant magnetization showed increasing when crystallinity increased. However, it also depends on presence of α-Fe2O3 phases and their grain size. Based on magnetic characterization analysis, sample with parameter of synthesis temperature 80°C, concentration of NaOH 5 M and stirring duration 120 minutes have been selected to be modified using polyethylene glycol (PEG)-4000. XRD and TEM analysis showed that surface modification with PEG-4000 could increase the crystallinity of nanoparticles, decrease agglomeration and control the shape to more spherical. VSM analysis showed that modification PEG-4000 could decrease the saturation magnetization which is due to the existence of α-FeO(OH) and γ-FeO(OH) phases from bonds at interface of CoFe2O4 as confirmed by XRD and Furrier Transform Infra Red (FTIR) analysis. Keywords: magnetic nanoparticles, CoFe2O4, copresipitation, PEG-4000

Structural, Magnetic and Rheological Behavior of Mn–Zn Ferrofluid

2018 ◽  
Vol 24 (8) ◽  
pp. 5560-5565
Author(s):  
K. V Zipare ◽  
S. S Bandgar ◽  
G. S Shahane
Keyword(s):  
Magnetic Field ◽  
Oleic Acid ◽  
Saturation Magnetization ◽  
Zinc Concentration ◽  
Ferrite Nanoparticles ◽  
Precipitation Method ◽  
Zn Ferrite ◽  
Co Precipitation ◽  
The Magnetic Field ◽  
Newtonian Behavior

Oleic acid coated Mn–Zn ferrite nanoparticles with different compositions have been synthesized by a chemical co-precipitation method to prepare kerosene based ferrofluid. XRD confirms the synthesis of single crystalline phase of Mn–Zn ferrite nanoparticles. The saturation magnetization increases with increase in zinc concentration, reaches maximum at x = 0.4 and decreases for further increase in zinc concentration. The variation in saturation magnetization can be correlated to the modifications in cation distribution as a result of replacement of Mn-ion by Zn-ion thereby modifying the superexchange interaction between the A and B sublattices. The synthesized ferrofluids behaved as Newtonian fluids in the absence of the magnetic field, which naturally reflected the lack of large aggregates. However, under the magnetic field, viscosity increased because of formation of chain-like clusters of nanoparticles showing non-Newtonian behavior of the fluid. The viscosity increases with increase in zinc concentration, reaches maximum at x = 0.4 and decreases for further increase in zinc concentration. The variation in viscosity can be correlated to the modifications in saturation magnetization as a result of substitution of Zn.

INCLUSION OF MAGNETIC NANOPARTICLES ОF MAGNETITE INTO PROTEIN PARTICLES OF CATALASE

2020 ◽  
pp. 83-84
Author(s):  
N. Balabushevich ◽  
K. Vlasova ◽  
D. Volodkin ◽  
Yu. Golovin ◽  
N. Klyachko
Keyword(s):  
Magnetic Field ◽  
Enzyme Activity ◽  
Magnetic Nanoparticles ◽  
Low Frequency ◽  
Alternating Magnetic Field ◽  
Precipitation Method ◽  
Immobilized Catalase ◽  
Protein Particles ◽  
Co Precipitation

In this work, vaterite microparticles with an immobilized catalase (enzyme) and magnetic nanoparticles (MNPs) of magnetite, obtained by the co-precipitation method, were used to study the enzyme activity under low frequency alternating magnetic field.

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