scholarly journals Recent Advances in Processing, Characterizations and Biomedical Applications of Spinel Ferrite Nanoparticles

2021 ◽  
pp. 62-120
Author(s):  
G. Katoch
Keyword(s):  
Spinel Ferrite ◽  
Sol Gel ◽  
Combustion Method ◽  
Ceramic Materials ◽  
Spinel Ferrites ◽  
Information Storage ◽  
Solution Combustion ◽  
Magnetic Imaging ◽  
Recent Developments ◽  
Co Precipitation

Many researchers are interested in investigating ceramic materials because of the potential for their use in nanotechnology. Spinel ferrites are a diverse group of materials with many applications. Electronic devices such as inductors, power, information storage, microwave, and induction tuners are only a few examples. As ferrite materials exhibit super-paramagnetic activity, their potential for biological applications such as drug delivery, hyperthermia, and resonance magnetic imaging. As a result, super-paramagnetism is a highly desirable property in spinel ferrites. Due to the size dependence, the methodologies used to synthesis of these materials have emerged as a critical step in achieving the desired properties. Many synthesis strategies have been developed in this regard such as sol-gel, co-precipitation, solid-state, solution combustion method and so on. As a result, this study provides a historical overview of spinel ferrites, as well as key principles for comprehending their various characterization techniques and properties. Recent developments in the synthesis and applications of spinel ferrites are also discussed.

Super-Paramagnetic Nanoparticles with Spinel Structure: A Review of Synthesis and Biomedical Applications

2015 ◽  
Vol 241 ◽  
pp. 139-176 ◽  
Author(s):  
Wesley S. Galvão ◽  
Davino M.A. Neto ◽  
Rafael M. Freire ◽  
P.B.A. Fechine
Keyword(s):  
Biomedical Applications ◽  
Electronic Devices ◽  
Ceramic Materials ◽  
Spinel Ferrites ◽  
Size Dependent ◽  
Magnetic Imaging ◽  
High Frequency Transformer ◽  
Cheap Method ◽  
Co Precipitation ◽  
Resonance Magnetic Imaging

The study of ceramic materials has attracted the attention of many researchers due to the possibility of their use in nanotechnology. The spinel ferrites form a large group of materials with a broad range of applications. Some examples include electronic devices such as high-frequency transformer cores, antenna rods, induction-tuners, among many others. However, when the ferritic materials display superparamagnetic behavior, their potential for biological applications like drug delivery, hyperthermia, resonance magnetic imaging and magnetic separation, become amazingly high. Therefore, the superparamagnetism is a characteristic strongly desired for spinel ferrites. Since this phenomenon is size-dependent, the methodologies to synthesize these materials has emerged as a crucial step in order to obtain the desired properties. In this regarding, several synthetic processes have been developed. For example, co-precipitation is a fast and cheap method to synthesize superparamagnetic spinel ferrites. However, methodologies involving microwave, ultrasound or polymers frequently result in these kind of materials. Therefore, this review brings a brief historic introduction about spinel ferrites as well as essential concepts to understand their structure and magnetic properties. In addition to this, recent advances in synthesis and applications of the superparamagnetic spinel ferrites are mentioned. Contents of Paper

Structural and magnetic properties of Cr doped strontium spinel ferrite SrFe2O4 by sol-gel auto-combustion method

2018 ◽  
Vol 550 ◽  
pp. 90-95 ◽  
Author(s):  
Nazia Yasmin ◽  
Iqra Inam ◽  
Iftikhar Ahmed Malik ◽  
Maria Zahid ◽  
Muhammad Naeem Ashiq ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Combustion Method ◽  
Auto Combustion ◽  
Structural And Magnetic Properties

Effect of La3+ Substitution on the Structural and Magnetic Properties of Mn-Zn Ferrite Prepared by Sol-Gel Auto-Combustion Method

2018 ◽  
Vol 916 ◽  
pp. 91-95
Author(s):  
Beh Hoe Guan ◽  
Muhammad Hanif bin Zahari ◽  
Kean Chuan Lee
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Combustion Method ◽  
Secondary Phases ◽  
Zn Ferrite ◽  
Auto Combustion ◽  
Structural And Magnetic Properties ◽  
The Rare Earth

Spinel ferrite with the chemical formula of Mn0.5Zn0.5LaxFe2-xO4(x= 0.02, 0.04, 0.06, 0.08, 0.10) were prepared by a sol-gel auto-combustion method. The effect of the rare-earth substitution on the microstructural properties of the synthesized powders were investigated through X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM), while for the magnetic properties, vibrating sample magnetometer (VSM) measurements were made. XRD patterns revealed characteristic peaks corresponding to spinel Mn-Zn ferrite structures with accompanying secondary phases, such as Fe2O3and LaFeO3. The initial addition of La3+into the spinel ferrite system resulted in an initial spike of the lattice parameter and crystallite size before proceeding to decrease as the rare-earth content continues to decrease. FESEM micrographs reveals agglomerated particles with considerable grain size distribution. The magnetic properties, especially the saturation magnetization,Ms, was found to decrease with each increase in La3+substitution. The research findings revealed the critical influence of the La3+substitution towards the overall structural and magnetic properties of the Mn-Zn ferrite samples.

Synthesis of Monodisperse Fe3O4 and MnFe2O4 Nanospheres by Using a Solvothermal Reduction Method

2011 ◽  
Vol 181-182 ◽  
pp. 393-396 ◽  
Author(s):  
Gui Hua Ren ◽  
Zhi Song Yu
Keyword(s):  
Reduction Method ◽  
Hydrothermal Reaction ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Decomposition Methods ◽  
Spinel Ferrites ◽  
Storage Devices ◽  
Auto Combustion ◽  
Potential Applications ◽  
Average Size

The spinel ferrites, MFe2O4(where M=Fe, Mn, Co, Ni, Zn, Mg, etc.) have attracted considerable interest during the last few decades due to their potential applications in high frequency transformers, filters, high density storage devices, and microwave applications. In the latest several years, many synthesis technologies such as sol-gel, auto-combustion, thermal decomposition methods and hydrothermal reaction have been developed to prepare spinel ferrite nanoparticles. In this paper, the spinel ferrites Fe3O4and MnFe2O4nanoparticles were synthesized by using a solvothermal reduction method. X-ray diffraction (XRD) and Raman analysis shows that all the peaks are close to the data for Fe3O4and MnFe2O4, indicating the prepared particles are single phase. The scan electronic microscopy (SEM) shows that the prepared Fe3O4and MnFe2O4are monodisperse nanospheres and with the average size of around 300nm.

Sol-Gel Synthesis of Nanostructured Alumina Supports for CO Oxidation Catalysts

2018 ◽  
Vol 917 ◽  
pp. 152-156
Author(s):  
Elena Krivoshapkina ◽  
Pavel Krivoshapkin ◽  
Aleksey Vedyagin
Keyword(s):  
Co Oxidation ◽  
Sol Gel ◽  
Catalyst Support ◽  
Combustion Method ◽  
Alumina Nanoparticles ◽  
Active Components ◽  
Solution Combustion ◽  
Catalytically Active ◽  
A New Technique ◽  
Sol Gel Synthesis

In present work, a new technique to prepare alumina nanoparticles and nanofibers using a sol-gel method was proposed. A solution combustion method was applied to form a nanostructured catalytically active layer of CuO–Co3O4–CeO2 on the surface of the alumina. The uniform distribution and fine dispersion of active components provide the appropriate activity of the catalysts obtained in a model reaction of CO oxidation. The morphology of nanostructured alumina was found to affect the catalytic behavior. Carbon monoxide conversion was observed at lower temperatures when alumina nanofibers were used as a catalyst support.

Characteristics of Sintered Materials Obtained from Ferrite Nanopowders Synthesised with Different Methods

2018 ◽  
Vol 762 ◽  
pp. 257-262
Author(s):  
Ilmārs Zālīte ◽  
Gundega Heidemane ◽  
Aija Krūmiņa ◽  
Dzintra Rašmane ◽  
Jānis Grabis ◽  
...  
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
Drying Method ◽  
Plasma Chemical ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
Co Precipitation ◽  
Sintered Materials

Ferrite materials, especially those containing nickel and cobalt, are popular due to their unique mechanical and magnetic properties. Single phase NiFe2O4 and CoFe2O4 nanopowders obtained by different methods were used for sintering studies. Chemical sol-gel self-propagating combustion method, co-precipitation technology combined with hydrothermal synthesis or spray-drying method, and high frequency plasma chemical synthesis have been used to synthesize ferrite nanopowders. Relatively dense (95-99%) materials with high saturation magnetization (MS = 80-84 emu/g for CoFe2O4 and MS = 46-48 emu/g for NiFe2O4) were obtained at 1100-1200 °C temperatures.

Structure and Magnetic Properties of CoFe2O4 Nanocrystal Thin Films Prepared by Sol-Gel Method

2011 ◽  
Vol 687 ◽  
pp. 756-758
Author(s):  
Jian Rong Sun ◽  
Zhi Guang Wang ◽  
Yu Yu Wang ◽  
Fa Shen Li
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Information Storage ◽  
Ceramic Method ◽  
Gel Method ◽  
Sol Gel Method ◽  
Phase Spinel ◽  
Ferrite Films

Thin films of CoFe2O4 spinel ferrite were prepared on silicon (100) substrates at low temperature by means of a modified polyvinyl alcohol processing, and the structure and magnetic properties as a function of the only one varied calcination temperature were investigated in detail and optimized. The CoFe2O4 ferrite films had a single phase spinel structure and were well-crystallized at temperature above 600 °C, which is much lower than the required temperature in the traditional ceramic method (about 1000 °C). The films annealed at and above 500 °C for 1h showed the grain sizes between 9 and 40 nm, and exhibited high coercivities and high saturation magnetization. Co-ferrite films prepared by sol-gel method and annealed at 700 °C had excellent potential for important technological applications, such as information storage and magnetooptical devices.

scholarly journals Comparative studies on impact of synthesis methods on structural and magnetic properties of magnesium ferrite nanoparticles

2014 ◽  
Vol 8 (3) ◽  
pp. 137-143 ◽  
Author(s):  
Navneet Kaur ◽  
Manpreet Kaur
Keyword(s):  
Sol Gel ◽  
Thermolysis Product ◽  
Ferrite Nanoparticles ◽  
Precipitation Method ◽  
Synthesis Methods ◽  
Magnesium Ferrite ◽  
Solution Combustion ◽  
Magnetic Parameters ◽  
Physical Density ◽  
Co Precipitation

Magnesium ferrite nanoparticles (NPs) were synthesized by co-precipitation, sol-gel and solution combustion methods. Polyethylene glycol (PEG), urea and oxalyl dihydrazide (ODH) were used as fuels for the combustion. Various physicochemical techniques viz. X-ray diffraction (XRD), vibrating sample magnetometry (VSM), Fourier transform infrared spectroscopy (FT-IR), BET surface analysis and transmission electron microscopy (TEM) were utilized to study the effect of synthetic methodology on the properties of synthesized NPs. Differences in crystallinity, surface area, particle size and magnetic parameters of the ferrite NPs synthesized by different methods were observed. XRD pattern of NPs obtained by sol-gel and combustion methods confirmed phase purity where as in co-precipitation method ?-Fe2O3 was detected as impurity phase which also resulted in greater value of physical density and lowering of magnetic parameters of the final thermolysis product. TEM micrographs indicated that ferrite NPs are spherical with average diameter of 12-25 nm. Presence of rectangular shaped crystallites of ?-Fe2O3 was clearly evident in the TEM images of the NPs synthesized by co-precipitation method.

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