Spinel Ferrite Nanoparticles: Synthesis, Crystal Structure, Properties, and Perspective Applications
24 Aug 2016-Vol. 195, pp 305-325
TL;DR: In this paper, a review of spinel unit cells, crystal chemical parameters, and extrinsic magnetic and optical properties are described, and the potential applications of SFs in different fields of technology are also discussed.
Abstract: Recent developments show that the exceptional physical, optical, magnetic, and electrical properties of spinel ferrite (SF) nanomaterials have now attracted the attention as high-density data storage materials, catalysts, gas sensors, rechargeable lithium batteries, information storage systems, magnetic bulk cores, adsorbents, magnetic fluids, microwave absorbers, and medical diagnostics. The aim of this review consists on an overview on the methods of preparation, the crystal structure and application of SFs used in technology for the design of new materials and devices. The chapter begins with a review of the different synthesis methods commonly used for the preparation of SFs. Then, the structural features of spinel unit cell, crystal chemical parameters, and extrinsic magnetic and optical properties are described in this chapter. Since the magnetism of SFs depends not only on particle chemistry and phase but also on the particle size and environment, the role of cationic distribution and ion exchange interaction are explored in determining the magnetic properties of the system. In addition, the potential applications of SFs in different fields of technology are also discussed.
Citations
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TL;DR: In this paper, a brief overview of CoFe2O4 as a semiconductor photocatalyst is presented and ferromagnetic behaviour of co-feathers is also discussed.
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TL;DR: In this article, the influence of non-magnetic Zn ions content on the structural, morphological and adsorption characteristics of Mg-Zn NPs has been investigated.
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02 Sep 2020
TL;DR: The findings display the applicability of the surface-modified CoFe2O4 nanoparticles in magnetic fluid hyperthermia toward noninvasive cancer treatment and other bio-applications.
Abstract: Oleic acid-coated cobalt ferrite nanoparticles were synthesized using the chemical co-precipitation route and characterized by standard techniques for structure, morphology, and magnetic properties analysis. The Rietveld refined X-ray diffraction (XRD) pattern of CoFe2O4 nanoparticles indicated the formation of a cubic-spinel single-phase structure with the Fd3m space group. The average crystallite size (∼12 nm) confirmed the nanocrystalline appearance of the prepared CoFe2O4 nanoparticles. Transmission electron microscopy (TEM) images revealed the spherical nature of both (CoFe2O4) and (OA-CoFe2O4) samples. The absorption bands in the Fourier transform infrared (FT-IR) spectrum at ∼3418, 3026, 1628, 1404, 1068, 845, 544, and 363 cm-1 affirmed the spinel ferrite formation and OA attachment. The M-H curve recorded at room temperature showed the superparamagnetic nature of the CoFe2O4 nanoparticles with moderate saturation magnetization (∼78 emu/gm). The blocking temperature of the prepared CoFe2O4 nanoparticles obtained from the field-cooled and zero-field-cooled (FC-ZFC) curve was estimated to be 144 K. Further, the characterized surface-modified CoFe2O4 was then added in ethylene glycol/water with various concentrations and characterized by the induction heating technique for the evaluation of their self-heating characteristics. A series of temperature versus time measurements were made by varying the ethylene glycol/water proportion for better understanding of the self-heating characteristics of the prepared CoFe2O4 nanoparticles. All of the findings display the applicability of the surface-modified CoFe2O4 nanoparticles in magnetic fluid hyperthermia toward noninvasive cancer treatment and other bio-applications.
89 citations
TL;DR: In this paper, a review of the adsorption behavior of uranium using titanium dioxide based sorbents is presented, where the structural characteristics of the sorbants are analyzed.
76 citations
01 Dec 2021
TL;DR: In this article, a review of spinel ferrite nanoparticles (SFs) as catalysts for photo-Fenton-like and heterogeneous Fentonlike oxidation is presented.
Abstract: Heterogeneous Fenton-like oxidation is one of the advanced oxidation processes (AOPs) that can successfully remove a large number of pollutants from water. Among various materials used as catalysts in this process, spinel ferrite nanoparticles (SFs) have received increasing attention in recent years because of their unique physicochemical properties, low-cost, good catalytic activity and interesting bandgap. In the same vein, their magnetic properties allow them to be easily, rapidly and inexpensively separated from the reaction medium. The present review highlights the unique structure and properties of different spinel ferrite nanoparticles, their synthesis approaches and their applications as a catalyst in heterogeneous Fenton-like and photo-Fenton-like oxidation. It was demonstrated that MFe2O4 have unlimited ability as catalysts in both heterogeneous Fenton-like and photo-Fenton-like oxidation. Thus, it can be deduced that their catalytic activity depends on the nature of divalent metal M, synthesis method, annealing temperature, pollutant nature and concentration, H2O2 concentration, pH, temperature and light source for photo-Fenton-like oxidation.
65 citations
References
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TL;DR: A short review on the various spinel ferrites in microemulsions in the recent years is given in this paper, where the focus then shifts to the use of micro-mulsions as nanoreactors for the synthesis of spinels.
1,003 citations
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TL;DR: In this article, the crystal structure of compounds with the general formula AB 2 X 4, which crystallize with the same atomic structure as the mineral spinel, MgAl 2 O 4, is reviewed.
Abstract: This paper reviews the crystal structure of compounds with the general formula AB 2 X 4 , which crystallize with the same atomic structure as the mineral spinel, MgAl 2 O 4 . Three degrees of freedom associated with the detailed atomic arrangements of spinels are considered here: (i) the lattice parameter, a; (ii) the anion parameter, u; and (iii) the cation inversion parameter, i. Oxide spinels are used as examples to explore the interrelationships between these parameters.
914 citations
TL;DR: The results indicated that the RGO/MnFe2O4/PVDF composites show the most excellent wave absorption properties, and the wave absorbing mechanism can be attributed to the dielectric loss, magnetic loss and the synergetic effect between RGO+Mn Fe 2O4, RGO-PV DF and MnFe2 O4+PvDF.
Abstract: MnFe2O4 nanoparticles have been synthesized on a large scale by a simple hydrothermal process in a wild condition, and the RGO/MnFe2O4 nanocomposites were also prepared under ultrasonic treatment based on the synthesized nanoparticles. The absorption properties of MnFe2O4/wax, RGO/MnFe2O4/wax and the RGO/MnFe2O4/PVDF (polyvinylidene fluoride) composites were studied; the results indicated that the RGO/MnFe2O4/PVDF composites show the most excellent wave absorption properties. The minimum reflection loss of RGO/MnFe2O4/PVDF composites with filler content of 5 wt % can reach −29.0 dB at 9.2 GHz, and the bandwidth of frequency less than −10 dB is from 8.00 to 12.88 GHz. The wave absorbing mechanism can be attributed to the dielectric loss, magnetic loss and the synergetic effect between RGO+MnFe2O4, RGO+PVDF and MnFe2O4+PVDF.
653 citations
TL;DR: In this paper, the use of ferrites in photocatalytic conversion of visible solar energy to generate e − /h +, which in turn produce reactive oxygen species through redox processes, for the degradation of the contaminants.
625 citations
TL;DR: In this article, the structural and magnetic properties of nanocrystalline manganese, cobalt, and nickel spinel ferrites dispersed in a highly porous SiO2 aerogel matrix were studied.
Abstract: The structural and magnetic properties of nanocrystalline manganese, cobalt, and nickel spinel ferrites dispersed in a highly porous SiO2 aerogel matrix were studied. X-ray diffraction and high-resolution transmission electron microscopy indicate that single crystalline ferrite nanoparticles are well dispersed in the amorphous matrix. The cation distribution between the octahedral and tetrahedral sites of the spinel structure was investigated by X-ray absorption spectroscopy. The analysis of both the X-ray absorption near edge structure and the extended X-ray absorption fine structure indicates that the degree of inversion of the spinel structure increases in the series Mn, Co, and Ni spinel, in accordance with the values commonly found in the corresponding bulk spinels. In particular, fitting of the EXAFS data indicates that the degree of inversion in nanosized ferrites is 0.20 for MnFe2O4, 0.68 for CoFe2O4, and 1.00 for NiFe2O4. Magnetic characterization further supports these findings.
420 citations