Simple Synthesis and Characterization of Cobalt Ferrite Nanoparticles by a Thermal Treatment Method

Naseri, Mahmoud; Saion, Elias; Ahangar, Hossein Abbastabar; Shaari, Abdul Halim; Hashim, Mansor

doi:10.1155/2010/907686

Cited by 143 publications

(34 citation statements)

References 41 publications

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“…As can be seen from Table 1, the increasing of time has significant effect on enlargement of particle size, although it had less effect on conversion of crystal structure. The maximum average particle size of 15 nm is obtained after annealing at 800 °C for 5 h. This suggests that the several neighboring particles fuse together to increase the particle size by the melting of their surfaces [35]. …”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size

Erfani

Saion

Soltani

et al. 2012

IJMS

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Calcium borate nanoparticles have been synthesized by a thermal treatment method via facile co-precipitation. Differences of annealing temperature and annealing time and their effects on crystal structure, particle size, size distribution and thermal stability of nanoparticles were investigated. The formation of calcium borate compound was characterized by X-ray diffraction (XRD) and Fourier Transform Infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), and Thermogravimetry (TGA). The XRD patterns revealed that the co-precipitated samples annealed at 700 °C for 3 h annealing time formed an amorphous structure and the transformation into a crystalline structure only occurred after 5 h annealing time. It was found that the samples annealed at 900 °C are mostly metaborate (CaB2O4) nanoparticles and tetraborate (CaB4O7) nanoparticles only observed at 970 °C, which was confirmed by FTIR. The TEM images indicated that with increasing the annealing time and temperature, the average particle size increases. TGA analysis confirmed the thermal stability of the annealed samples at higher temperatures.

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Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size

Erfani

Saion

Soltani

et al. 2012

IJMS

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“…Cobalt ferrites having different sizes, from ultrasmall (2 nm) to 50 nm, can be fabricated by distinct techniques (Goodarz Naseri et al, 2010), mainly co-precipitation method (CPM), sometimes without using any capping agents/surfactants. Thus, the CPM was used to synthesize ultrasmall CoFe 2 O 4 superparamagnetic nanoparticles (SPMNPs, 2-8 nm of an average size and high surface area of 140.9 m 2 /g) without any surfactant (Kaur Rajput, 2013).…”

Section: Cobalt Ferritesmentioning

confidence: 99%

Mini-review: Ferrite nanoparticles in the catalysis

Kharisov

Dias

Kharissova

2019

Arabian Journal of Chemistry

243

118

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Recent applications of ferrite nanoparticles as catalysts in organic processes are reviewed. Catalytic applications include the use of mainly cobalt, nickel, copper, and zinc ferrites, as well as their mixed-metal combinations with Cr, Cd, Mn and sometimes some lanthanides. Core-shell nanostructures with silica and titania are also used without loss of magnetic properties. The ferrite nanomaterials are obtained mainly by wet-chemical sol-gel or co-precipitation methods, more rarely by sonochemical technique, mechanical high-energy ball milling, spark plasma sintering, microwave heating or hydrothermal route. Catalytic processes with application of ferrite nanoparticles include decomposition (in particular photocatalytic), reactions of dehydrogenation, oxidation, alkylation, C-C coupling, among other processes. Ferrite nano catalysts can be easily recovered from reaction systems and reused up to several runs almost without loss of catalytic activity.

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“…The spinel ferrite structure is a cubic close-packed arrangement of oxygen atoms, where M 2+ and Fe 3+ ions occupy either tetrahedral (A) or octahedral (B) sites [5]. Magnetite (Fe 3 O 4 ) and cation-substituted magnetite (M x Fe 3−x O 4 ; M=Co, Fe, Ni, Mn, etc) are among the most commonly investigated magnetic inverse spinel ferrites [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Exploring the effect of Co concentration on magnetic hyperthermia properties of Co_xFe_3−xO₄ nanoparticles

Yasemian

Kashi

Ramazani

2020

Mater. Res. Express

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Although enhanced ferrite nanoparticles (NPs) have been envisioned for use in future biomedical applications, less attempt has been made to tailoring and optimizing their detailed magnetic properties and specific loss power (SLP) values. Herein, Co x Fe 3−x O 4 (0 × 1) NPs are synthesized using a coprecipitation method at 80°C in the presence of air atmosphere. The effect of varying Co concentration on crystalline, morphological, magnetic and hyperthermia properties is also investigated in detail. Hysteresis loop measurements showed an increase in coercivity (H c ) from 7.75 to 340.50 Oe, and a decrease in saturation magnetization (M s ) from 59.10 to 32.70 emu g −1 with increasing x=0 (pure magnetite) to x=1 (pure Co ferrite), respectively. In addition to confirming the hysteresis loop results, first-order reversal curve (FORC) analysis estimated a 52% decrease in superparamagnetic (SP) fraction. Hyperthermia measurements carried out under an alternating magnetic field with intensity of 400 Oe and a frequency of 400 kHz showed an increase in SLP from x=0 to x=0.4, and a decrease in SLP for 0.4 <× 1. SLP was maximized at 395 W g −1 for the intermediate concentration of x=0.4. The optimized heat generation of Co 0.4 Fe 2.6 O 4 NPs comprising approximately 50%-50% SP-ferromagnetic fractions may result from the simultaneous contribution of the three following mechanisms: hysteresis loop loss, Brownian and Neel relaxation together with relatively high H c and moderate M s . Abbreviations (NPs) Nanoparticles (SLP) specific loss power (FORC) first-order reversal curve (SP) superparamagnetic (FESEM) field-emission scanning electron microscopy (H c ) coercivity (M s ) saturation magnetization (K) anisotropy constant

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Simple Synthesis and Characterization of Cobalt Ferrite Nanoparticles by a Thermal Treatment Method

Cited by 143 publications

References 41 publications

Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size

Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size

Mini-review: Ferrite nanoparticles in the catalysis

Exploring the effect of Co concentration on magnetic hyperthermia properties of Co_xFe_3−xO₄ nanoparticles

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Simple Synthesis and Characterization of Cobalt Ferrite Nanoparticles by a Thermal Treatment Method

Cited by 143 publications

References 41 publications

Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size

Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size

Mini-review: Ferrite nanoparticles in the catalysis

Exploring the effect of Co concentration on magnetic hyperthermia properties of CoxFe3−xO4 nanoparticles

Contact Info

Product

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Exploring the effect of Co concentration on magnetic hyperthermia properties of Co_xFe_3−xO₄ nanoparticles