Ferrite nanoparticles: Synthesis, characterisation and applications in electronic device

Kefeni, Kebede K.; Msagati, Titus A.M.; Mamba, Bhekie B.

doi:10.1016/j.mseb.2016.11.002

Cited by 473 publications

(171 citation statements)

References 220 publications

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“…The scorpionate complex 1 [18] and the magnetic ferrite [27] were synthesized and characterized according to methods described in the literature. Under microwave (MW) irradiation at 50 • C during 6 h, the recycling studies showed a loss of 40% in the activity relative to the first run, which is probably due to mixture decomposition under the oxidant conditions used.…”

Section: Methodsmentioning

confidence: 99%

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New Trendy Magnetic C-Scorpionate Iron Catalyst and Its Performance towards Cyclohexane Oxidation

et al. 2018

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For the first time, a magnetic C-scorpionate catalyst was prepared from the iron(II) complex [FeCl 2 {κ 3 -HC(pz) 3 }] (pz = pyrazol-1-yl) and ferrite, using the sustainable mechanochemical synthetic procedure. Its catalytic activity for the cyclohexane oxidation with tert-butyl hydroperoxide (TBHP) was evaluated in different conditions, namely under microwave irradiation and under the effect of an external magnetic field. The use of such magnetic conditions significantly shifted the catalyst alcohol/ketone selectivity, thus revealing a promising, easy new protocol for tuning selectivity in important catalytic processes.

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Section: Methodsmentioning

confidence: 99%

“…The scorpionate complex 1 [18] and the magnetic ferrite [27] were synthesized and characterized according to methods described in the literature.…”

Section: Methodsmentioning

confidence: 99%

New Trendy Magnetic C-Scorpionate Iron Catalyst and Its Performance towards Cyclohexane Oxidation

et al. 2018

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“…Ferrite nanoparticles (FNPs), which fall into the category of BTMOs, possess typical spinel structures. Here A and B are metallic cations positioned at two different crystallographic sites, the tetrahedral (A site) and the octahedral (B site) [22]. The common examples for ferrites are MFe 2 O 4 (where M = Mn, Fe, Co, Ni etc.)…”

Section: Introductionmentioning

confidence: 99%

“…and many of these nanoparticles demonstrate superparamagnetic (SPM) properties. The superparamagnetism is manifested below a critical size of the nanoparticles of around 30 nm in diameter [22]. By regulating the M 2+ appropriately, the magnetic configurations of MFe 2 O 4 can be tuned to obtain high magnetic permeability and electrical resistivity.…”

Section: Introductionmentioning

confidence: 99%

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Chattopadhyay

Samanta

Srivastava

et al. 2019

Journal of Magnetism and Magnetic Materials

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The present article reports the governing influence of substituting the M 2+ site in nanoscale MFe 2 O 4 spinel ferrites by different magnetic metals (Fe/Mn/Co/Ni) on magnetorheological and magneto-elastoviscous behaviors of the corresponding magnetorheological fluids (MRFs). Different doped MFe 2 O 4 nanoparticles have been synthesized using the polyol-assisted hydrothermal method. Detailed steady and oscillatory shear rheology have been performed on the MRFs to determine the magneto-viscoelastic responses The MRFs exhibit shear thinning behavior and augmented yield characteristics under influence of magnetic field. The steady state magnetoviscous behaviors are scaled against the governing Mason number and self-similar response from all the MRFs have been noted. The MRFs conform to an extended Bingham plastic model under field effect. Transient magnetoviscous responses show distinct hysteresis behaviors when the MRFs are exposed to time varying magnetic fields. Oscillatory shear studies using frequency and strain amplitude sweeps exhibit predominant solid like behaviors under field environment. However, the relaxation behaviors and strain amplitude sweep tests of the MRFs reveal that while the fluids show solid-like behaviors under field effect, they cannot be termed as typical elastic fluids. Comparisons show that the MnFe 2 O 4 MRFs have superior yield performance among all. However, in case of dynamic and oscillatory systems, CoFe 2 O 4 MRFs show the best performance. The viscoelastic responses of the MRFs are noted to correspond to a three element viscoelastic model. The study may find importance in design and development strategies of nano-MRFs for different applications. The supplementary material document contains additional information, data, tables and plots of the complex fluid characterization, rheological behavior and additional data on the magnetoelastoviscous response of the fluids.

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“…1,[12][13][14][15][16][17] In the last years, ferrite nanoparticles especially have attracted much attention as their properties are not only affected by the chemical composition, but also by the size of the crystallites. 6,[18][19][20][21][22][23] For example, in CFO nanoparticles an increase of the coercivity was reported for decreasing particle size. 6,22 Not only the magnetic properties, but also the electrical properties vary with size, shape and the preparation condition of the particles.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe₂O₄)

2019

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Monophasic nano-crystalline CoFe 2 O 4 (CFO) nanoparticles of high purity have been synthesised through a low temperature hydrothermal route, which does not involve hazardous chemicals, or conditions. The easy, green procedure involves a hydrothermal treatment at 135 C of an aqueous suspension of the oxalate salts of the precursors. No further purification or annealing procedure was necessary to obtain the crystalline nano-structured oxide. The nanoparticles were characterized structurally and chemically by powder X-ray diffraction (PXRD), Inductively Coupled Plasma Spectrometry (ICP-MS) and Scanning Electron Microscopy (SEM), thus confirming the successful synthesis of the CoFe 2 O 4 particles with the expected crystal phase and stoichiometry and an almost complete inverse spinel structure. From the nanoparticles pellets were pressed to investigate the electronic conduction properties using electrochemical impedance spectroscopy (EIS). At low temperatures, the conductivity measurements reveal a semiconducting behavior originating from hopping between Co sites and a total conductivity dominated by the grain boundary contribution. At higher temperatures (T > 400 C) a metallic-insulator transition occurs, which is attributed to additional hopping of electrons between the Fe sites.

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Ferrite nanoparticles: Synthesis, characterisation and applications in electronic device

Cited by 473 publications

References 220 publications

New Trendy Magnetic C-Scorpionate Iron Catalyst and Its Performance towards Cyclohexane Oxidation

New Trendy Magnetic C-Scorpionate Iron Catalyst and Its Performance towards Cyclohexane Oxidation

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe₂O₄)

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Ferrite nanoparticles: Synthesis, characterisation and applications in electronic device

Cited by 473 publications

References 220 publications

New Trendy Magnetic C-Scorpionate Iron Catalyst and Its Performance towards Cyclohexane Oxidation

New Trendy Magnetic C-Scorpionate Iron Catalyst and Its Performance towards Cyclohexane Oxidation

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe2O4)

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Product

Resources

About

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe₂O₄)