Synthesis and characterization of ZnFe2O4 magnetic nanoparticles via a PEG-assisted route

Köseoğlu, Yüksel; Baykal, A.; Toprak, Muhammet S.; Gözüak, Fatma; Basaran, Ali C.; Aktaş, B.

doi:10.1016/j.jallcom.2007.07.121

Cited by 138 publications

(42 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is reported earlier that the cobalt ferrite is the most active catalyst at a lower activation temperature[7]. However, in our present study, the sample Mn 0.5 Co 0 5. Fe 2 O 4 acts as a good catalyst with higher yield of benzaldehyde with good selectivity as compared to the other (CoFe 2 O 4 , Mn 0.1 Co 0.9 Fe 2 O 4 , Mn 0.2 Co 0.8 Fe 2 O 4 , Mn 0.3 Co 0.7 Fe 2 O 4 , and Mn 0.4 Co 0.6 Fe 2 O 4 ) samples.…”

contrasting

confidence: 60%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

View full text Add to dashboard Cite

Spinel Mn x Co 1−x Fe 2 O 4 ; x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoparticles were synthesized by ureaassisted auto combustion method using nitrates of Co, Mn and Fe as the starting materials and urea as the fuel. X-ray diffraction (XRD) analysis showed that all composition was found to have a cubic spinel structure. The average crystallite size of the samples was estimated using the Debye-Scherrer formula and was found to be in the range of 22.62 and 36.45 nm. The lattice parameter increased from 8.432 to 8.457Å with increasing the Mn 2+ content, which was determined by Rietveld analysis. High-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses were used to study the morphological variation, and the results showed a nanosized particlelike morphology. Energy-dispersive X-ray (EDX) results showed that the composition of the elements was relevant as expected from the synthesis. The bandgap energy of the pure CoFe 2 O 4 was estimated to be 2.33 eV from UV-visible diffuse reflectance spectroscopy (DRS). With the increase of Mn 2+ ion, the bandgap energy increased from 2.35 to 2.42 eV. The magnetic properties of the A. Manikandan ( ) · S. samples were investigated at room temperature by using a vibrating sample magnetometer (VSM). The magnetic hysteresis (M-H) loop confirmed the superparamagnetic nature of pure CoFe 2 O 4 and a weak ferromagnetic behavior of Mn 2+ doped CoFe 2 O 4 samples with specific saturation magnetization in the range of 55.16 ± 24 and 66.92 ± 05 emu/g. All compositions of spinel Mn x Co 1−x Fe 2 O 4 samples were successfully tested as catalyst for the conversion of benzyl alcohol, which has resulted in 62.75 and 92.62 % conversion efficiency of CoFe 2 O 4 and Mn 0.5 Co 0.5 Fe 2 O 4 , respectively.

show abstract

contrasting

confidence: 60%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

View full text Add to dashboard Cite

show abstract

“…PEG is a short-chain polymer with a uniform and ordered chain structure, which can be easily adsorbed on the surface of metal oxide colloid. This strong interaction kinetically decreases the activities of metal oxide colloid, and thus control the growth rates of various crystallographic facets of crystals which can control the morphology [22][23][24][25] . In this research, regular and spherical particles were obtained at low and high concentrations of PEG (in all A, B, and C sample series), respectively.…”

Section: Patilmentioning

confidence: 99%

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

Ghasemi

Jafari

2017

Mat. Res.

View full text Add to dashboard Cite

Sol-gel modified Pechini's method was used to prepare WO 3 nanopowders using dicarboxylic acid and polyethylene glycol as the chelating agent and polymeric source, respectively. WO 3 powders were first prepared by calcination of resin precursor at 550ºC under various initial concentrations of metal ion (12.5-50 mmol), acid (125-500 mmol), a complexing agent (32-262 mmol), and polyethylene glycol (1-16.5 mmol) in the air atmosphere. The products were characterized using X-ray powder diffraction, field emission scanning electron microscopy, and energy dispersive spectroscopy. The results revealed that the WO 3 nanopowders prepared with different amounts of chelating agent and polyethylene glycol, crystallized in monoclinic phase. The nanopowders were impurity-free due to the presence of the complexing agent and polyethylene glycol as carbon sources. Morphological evolution indicated that the nanopowders evolved from rod-like to regular and spherical shapes, depending on complexing agent and polyethylene glycol amounts. Nanopowders with an average particle size of approximately 58 nm and a narrow size distribution were obtained.

show abstract

“…Several recent studies on Mn-Zn based ferrites nanoparticles were reported [25], but none of them reported the non-monotonic magnetization behavior observed in our ferrite nanoparticles. In a recent study [26], we have shown that the peculiar magnetization properties of Mn 0.5 Zn 0.5 Gd x Fe (2-x) O 4 nanoparticles can be explained by the core-shell model of magnetization.…”

Section: Introductionmentioning

confidence: 58%

Predicting a major role of surface spins in the magnetic properties of ferrite nanoparticles

Kim¹,

Mohite

Issa

et al. 2009

Cryst. Res. Technol.

View full text Add to dashboard Cite

Room-temperature magnetization hysterisis measurements were conducted on Mn 0.5 Zn 0.5 Gd x Fe (2-x) O 4 ferrite nanoparticles, with x = 0, 0.5, 1.0, 1.5. The structure of this ferrite is normal spinel where the added of Gd 3+ions occupied the octahedral sites and replaces Fe 3+ ions. The saturation magnetization was found to increase with the initial addition of the Gd 3+ ions followed by a sharp decrease with further addition of Gd 3+ ions. The Curie temperature was found to increase up to Gd 3+ concentration of x = 1.0, and then decreases at x = 1.5. These results were attributed to the surface spins. Because the size of Gd 3+ ions is larger than that of Fe 3+ions, the substitution of Fe 3+ ions with the Gd 3+ ions results in surface disorder which results in surface spins. A core-shell magnetization model was introduced where several factors were combined to explain our results.

show abstract

Synthesis and characterization of ZnFe2O4 magnetic nanoparticles via a PEG-assisted route

Cited by 138 publications

References 46 publications

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

Predicting a major role of surface spins in the magnetic properties of ferrite nanoparticles

Contact Info

Product

Resources

About