scholarly journals Morphologic, structural, and magnetic characterization of cobalt ferrite nanoparticles synthesized at different temperatures

2021 ◽  
Vol 9 (9) ◽  
pp. 399-405
Author(s):  
Kétlin Santos Alberton ◽  
Liza Bruna Reis Monteiro ◽  
Anne Beatriz Ramos Moraes ◽  
Raynara Vitória dos Santos Paiva Bucar ◽  
Maicon Maciel Ferreira de Araujo ◽  
...  
Keyword(s):  
Cobalt Ferrite ◽  
Magnetic Moments ◽  
X Ray Diffraction ◽  
Cofe2o4 Nanoparticles ◽  
First Order ◽  
Transmission Electron ◽  
Two Samples ◽  
Different Temperatures ◽  
Co Precipitation

In this study we report on the synthesis and characterization of cobalt ferrite (CoFe2O4) nanoparticles (NPs), synthesized by chemical co-precipitation in alkaline medium. Two samples were synthesized at two different temperatures, 35 and 90 oC. Both samples were characterized by Transmission Electron Microscopy (TEM), x-ray diffraction (XRD), and room-temperature (RT) magnetization. Two samples showed superparamagnetic behavior (SPM) at RT. TEM reveals morphological mean diameter increasing 5.8 nm to 10.4 nm, with the increase of the co-precipitation temperature. XRD confirm the inverse cubic spinel structure. The RT magnetization curves were analyzed by the first-order Langevin function averaged out by a lognormal distribution function of magnetic moments. This analysis showed saturation magnetization and magnetic moment increases from 60.2 to 74.8 emu/g and from 3.9 x 103 to 8.2 x 103 mB, respectively.

Characterization of Al2(WO4)3 Synthesized by Co-Precipitation Method

2014 ◽  
Vol 798-799 ◽  
pp. 85-89 ◽  
Author(s):  
E.S.G. Junior ◽  
P.M . Jardim
Keyword(s):  
Precipitation Method ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Tem Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Co Precipitation ◽  
Alpha Alumina

Al2(WO4)3was synthesized by co-precipitation using Na2WO4and Al (NO3)3as precursors. After drying the precipitate, it was calcined at different temperatures between 500°C and 800°C. The crystallization and degradation temperatures of the samples were evaluated by means of Differential Scanning Calorimetry (DSC), Thermogravimetry (TG) and X-Ray Diffraction (XRD). It was observed that the crystallization starts at around 600°C, however Transmission Electron Microscopy (TEM) analysis showed that at this temperature the sample is partially amorphous. The degradation of the material starts at around 1200°C and at 1400°C the tungsten oxide has almost completely evaporated and the material is transformed mainly in alpha-alumina.

Microstructure Characterization of Metal Mixed Oxides

MRS Advances ◽  
2017 ◽  
Vol 2 (64) ◽  
pp. 4025-4030 ◽  
Author(s):  
T. Kryshtab ◽  
H. A. Calderon ◽  
A. Kryvko
Keyword(s):  
Mixed Oxides ◽  
Profile Analysis ◽  
Atomic Resolution ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Reconstruction Procedure ◽  
Transmission Electron ◽  
Xrd Patterns ◽  
Co Precipitation

ABSTRACTThe microstructure of Ni-Mg-Al mixed oxides obtained by thermal decomposition of hydrotalcite-like compounds synthesized by a co-precipitation method has been studied by using X-ray diffraction (XRD) and atomic resolution transmission electron microscopy (TEM). XRD patterns revealed the formation of NixMg1-xO (x=0÷1), α-Al2O3 and traces of MgAl2O4 and NiAl2O4 phases. The peaks profile analysis indicated a small grain size, microdeformations and partial overlapping of peaks due to phases with different, but similar interplanar spacings. The microdeformations point out the presence of dislocations and the peaks shift associated with the presence of excess vacancies. The use of atomic resolution TEM made it possible to identify the phases, directly observe dislocations and demonstrate the vacancies excess. Atomic resolution TEM is achieved by applying an Exit Wave Reconstruction procedure with 40 low dose images taken at different defocus. The current results suggest that vacancies of metals are predominant in MgO (NiO) crystals and that vacancies of Oxygen are predominant in Al2O3 crystals.

Preparation and characterization of iron oxide nanoparticles coated with chitosan for removal of Cd(II) and Cr(VI) from aqueous solution

2014 ◽  
Vol 70 (6) ◽  
pp. 1004-1010 ◽  
Author(s):  
Th. I. Shalaby ◽  
N. M. Fikrt ◽  
M. M. Mohamed ◽  
M. F. El Kady
Keyword(s):  
Electron Microscope ◽  
Magnetic Nanoparticles ◽  
Magnetic Nanomaterials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Toxic Heavy Metals ◽  
Transmission Electron ◽  
Magnetite Fe3o4 ◽  
Co Precipitation

This study investigated the applicability of magnetite Fe3O4 nanoparticles coated with chitosan (CMNs) for the removal of some toxic heavy metals from simulated wastewater. Magnetic nanomaterials were synthesized using the co-precipitation method and characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, and Fourier transformer infrared spectroscopy. The magnetic properties of the prepared magnetic nanoparticles were determined by a vibrating-sample magnetometer. Batch experiments were carried out to determine the adsorption kinetics of Cr(VI) and Cd(II) by magnetic nanoparticles. It is noteworthy that CMNs show a highly efficient adsorption capacity for low concentration Cr(VI) and Cd(II) ions solution, which can reach 98% within 10 min.

SYNTHESIS AND CHARACTERIZATION OF BIFUNCTIONAL CoFe2O4–ZnS NANOCOMPOSITE

2011 ◽  
Vol 10 (01n02) ◽  
pp. 237-240 ◽  
Author(s):  
J. P. BORAH ◽  
C. BORGOHAIN ◽  
K. C. SARMA ◽  
K. K. SENAPATI ◽  
P. PHUKAN
Keyword(s):  
Drug Targeting ◽  
Room Temperature ◽  
Cobalt Ferrite ◽  
Magnetic Nanomaterials ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Magnetic Fluid Hyperthermia ◽  
X Ray ◽  
Transmission Electron

The synthesis of composite magnetic nanomaterials has received increasing attention due to their electronic, magnetic, catalytic, and chemical or biological sensing properties. We have prepared cobalt ferrite–zinc sulfide nanocomposites by a chemical route. The synthesized nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and photoluminescence spectrometer (PL). The fluorescent magnetic nanoparticles (FMNPs) had a typical diameter of 30±5 nm and saturation magnetization of 5.8 emu g-1 at room temperature. So, these FMNPs may be potentially applied in different fields such as optoelectronic devices, biolabeling, imaging, drug targeting, bioseparation, magnetic fluid hyperthermia, etc.

Synthesis and Activity of Co-doped Barium Cerium Zirconate for Hydrogen Reforming and Purification

2008 ◽  
Vol 1126 ◽  
Author(s):  
Aravind Suresh ◽  
Joysurya Basu ◽  
Nigel M Sammes ◽  
Barry C Carter ◽  
Benjamin A Wilhite
Keyword(s):  
Hydrogen Generation ◽  
Ac Impedance ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Ac Impedance Spectroscopy ◽  
Methanol Partial Oxidation ◽  
Transmission Electron ◽  
Catalytically Active ◽  
Different Temperatures ◽  
Co Precipitation

AbstractBaCe0.25Zr0.60Co0.15O3-x (BCZC) was synthesized via oxalate co-precipitation route. Material was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Catalytic activity of BCZC with respect to hydrogen generation via methanol partial oxidation was determined. Conductivity of the material at different temperatures and under different environments was determined by AC impedance spectroscopy. XRD and TEM results indicated that BCZC was synthesized as a homogeneous cubic phase material. Catalyst tests indicated that BCZC was catalytically active towards hydrogen generation and AC impedance results were positive enough to warrant further electrochemical studies.

Synthesis and Characterization of Structure of Fe3O4@Graphene Oxide Nanocomposites

2016 ◽  
Vol 25 (6) ◽  
pp. 096369351602500 ◽  
Author(s):  
Ruimin Fu ◽  
Mingfu Zhu
Keyword(s):  
Graphene Oxide ◽  
Drug Carrier ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Co Precipitation ◽  
Ft Ir Spectroscopy

Nowadays, the hummers method for preparation of graphene oxide (GO) was improved. The grapheme oxide @ Fe3O4 magnetic nanocomposites were synthesized by co-precipitation method. After analysing the morphology and structure of obtained nanocomposites by X-ray diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared (FT-IR) spectroscopy, the result was shown as follows. The particle size of Fe3O4 in nanocomposites is 30 nm. Many functional groups are found in grapheme oxide, and such groups could be used to bind with the drug. In the test for magnetic properties, the nanocomposites gathered rapidly in the vicinity of the permanent magnet. The nanocomposites, with high superparamagnetism, can be used in the following applications: drug targeting transports, drug carrier, and diagnosis assistant system.

scholarly journals Synthesis and characterization of iron oxide magnetic nanoparticles

Nukleonika ◽  
2017 ◽  
Vol 62 (2) ◽  
pp. 73-77 ◽  
Author(s):  
Zbigniew Surowiec ◽  
Mieczysław Budzyński ◽  
Katarzyna Durak ◽  
Grzegorz Czernel
Keyword(s):  
Magnetic Nanoparticles ◽  
Ammonia Concentration ◽  
Blocking Temperature ◽  
Size Distributions ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Iron Oxide Magnetic Nanoparticles ◽  
Means Of Transmission ◽  
Co Precipitation

Abstract Small particles of magnetite, i.e. 7.5, 13.4 and 14.1 nm in diameter, were obtained by the method of co-precipitation. The crystal structure and size distributions were determined by means of transmission electron microscopy and X-ray diffraction. The magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy within the temperature range from 3 K to room temperature (RT). The Mössbauer study of magnetic nanoparticles reveals relaxation behaviour related to the existence of the superparamagnetic phase. The blocking temperature depends on the sizes of the nanoparticles and the ammonia concentration.

Preparation and Characterization of Pr-CeO2 Nano-Powders by Co-Precipitation-Hydrothermal Method

2008 ◽  
Vol 368-372 ◽  
pp. 781-783
Author(s):  
Zhen Feng Zhu ◽  
Jing Ping Li ◽  
Jun Yang
Keyword(s):  
Hydrothermal Method ◽  
Hydrothermal Treatment ◽  
Treatment Time ◽  
Raw Materials ◽  
Treatment Temperature ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Co Precipitation ◽  
Nano Size

Pr-CeO2 nano-size powders with the average crystallites size of 12 nm and particle size of 18 nm were prepared by a co-precipitation-hydrothermal method using Ce(NO3)3·6H2O, Pr6O11 as raw materials and ammonia as the precipitation agent. The influence of hydrothermal treatment time, hydrothermal treatment temperature on the average crystallites size, color of powders and the solubility of praseodymium were investigated. The synthesized powders were characterized by X-ray diffraction, transmission electron microscopy and color measurements. Results showed that after calcining at 800°C for 4 hours, the color of the as-prepared powder changes from light red to red brown, the solubility of praseodymium and the crystallites size of the Pr-CeO2 powder both increase.

Preparation and Characterization of CA-PEI Double Modification Water-Based Magnetic Fluid

2013 ◽  
Vol 423-426 ◽  
pp. 151-154
Author(s):  
Xi Sheng He ◽  
Hui Qing Peng ◽  
Jin Li ◽  
Jun Dong
Keyword(s):  
Magnetic Fluid ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Water Based ◽  
Co Precipitation ◽  
Double Modification ◽  
Scanning Electron

Fe3O4 magnetic nanoscale water-based magnetic fluid was fabricated by co-precipitation with citric acid (CA) and polyethylene amine (PEI) as dispersant. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscope (SEM) and vibrating sample magnetometer (VSM) were used to investigate the samples.The modified magenetic nanoparticles (MNPs) size of about 50nm and have a saturation magnetization about 0.25emu/g.These nanoparticles can be applied to the study of genophore.

Magnetic CuFe2O4 Nanoparticles for Adsorpstion of Cr(VI) from Aqueous Solution

2014 ◽  
Vol 896 ◽  
pp. 104-107 ◽  
Author(s):  
Poedji Loekitowati Hariani ◽  
Fahma Riyanti
Keyword(s):  
Aqueous Solution ◽  
Precipitation Method ◽  
Alkaline Condition ◽  
Batch Adsorption ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Adsorption Condition ◽  
Co Precipitation ◽  
20 Nm

CuFe2O4 nanoparticles were synthesized by co-precipitation method from the solution of CuCl2 and FeCl3 in alkaline condition. The prepared magnetic CuFe2O4 can be used to adsorb Cr (VI) ions from aqueous solution and separated from medium by magnetic technique. The characterization of CuFe2O4 with X-Ray diffraction (XRD) showed cubic units shells with diameter in the range 15-20 nm which obtained by Transmission Electron Microscope (TEM). The saturation of magnetization is around 13 emu g-1 measured with Vibrating Sample Magnetometer (VSM). Batch adsorption studies were carried out to optimize adsorption condition. Effective conditions for adsorption of Cr (VI) were found at the weight of CuFe2O4 was 1.0 g with contact time of 60 minutes and pH 3 with adsorption capacity 9.20 mg g-1.

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