scholarly journals Structural, Magnetic, Optical Properties and Photocatalytic Activity of Nanocrystalline Cobalt Ferrite Prepared by Three Different Methods

2021 ◽  
Author(s):  
S. S. Selima ◽  
W. A. Bayoumy ◽  
M. Khairy ◽  
M.A. Mousa
Keyword(s):  
Optical Properties ◽  
Cation Distribution ◽  
Cobalt Ferrite ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Mesoporous Structure ◽  
Particle Sizes ◽  
Preparation Route ◽  
Co Precipitation ◽  
The Impact

Abstract Cobalt ferrite (CoFe2O4) nanoparticles were synthesized through three different routes (chemical co-precipitation, ceramic, and sol-gel). The products were characterized by XRD, SEM, TEM, Raman spectroscopy, FTIR, photoluminescence (PL), BET, XPS, vibrating sample magnetometer (VSM). The X-ray analysis validates the spinel structure of the samples with particle sizes between 21 – 36 nm. XPS revealed the impact of the preparation route on cation distribution at the tetrahedral and octahedral sites in spinel ferrite lattice. All ferrite surfaces exhibit a mesoporous structure with a surface area between 25 – 99 m2/g. The results show that the prepared samples exhibit either ferromagnetic or super-paramagnetic behavior. The ferrite samples showed a photocatalytic performance under visible light. The present work demonstrates that each of the particle size and cation distribution is effective in controlling the structural, magnetic, and optical properties. The results obtained reveal that this kind of CoFe2O4 spinel ferrite nanoparticles has promising applications in magnetic designs and water treatment fields.

scholarly journals Photocrosslinking and photopatterning of magneto-optical nanocomposite sol–gel thin film under deep-UV irradiation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Bidaud ◽  
D. Berling ◽  
D. Jamon ◽  
E. Gamet ◽  
S. Neveu ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Optical Devices ◽  
High Concentration ◽  
Nanocomposite Thin Films ◽  
Deep Uv ◽  
High Concentrations ◽  
193 Nm ◽  
The Impact

AbstractThis paper is aimed at investigating the process of photocrosslinking under Deep-UV irradiation of nanocomposite thin films doped with cobalt ferrite magnetic nanoparticles (MNPs). This material is composed of a hybrid sol–gel matrix in which MNP can be introduced with high concentrations up to 20 vol%. Deep-UV (193 nm) is not only interesting for high-resolution patterning but we also show an efficient photopolymerization pathway even in the presence of high concentration of MNPs. In this study, we demonstrate that the photocrosslinking is based on the free radical polymerization of the methacrylate functions of the hybrid precursor. This process is initiated by Titanium-oxo clusters. The impact of the nanoparticles on the photopolymerization kinetic and photopatterning is investigated. We finally show that the photosensitive nanocomposite is suitable to obtain micropatterns with sub-micron resolution, with a simple and versatile process, which opens many opportunities for fabrication of miniaturized magneto-optical devices for photonic applications.

Cation distribution dependence of magnetic properties of sol–gel prepared MnFe2O4 spinel ferrite nanoparticles

2010 ◽  
Vol 322 (21) ◽  
pp. 3396-3400 ◽  
Author(s):  
Jianjun Li ◽  
Hongming Yuan ◽  
Guodong Li ◽  
Yanju Liu ◽  
Jinsong Leng
Keyword(s):  
Magnetic Properties ◽  
Cation Distribution ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Ferrite Nanoparticles

scholarly journals Influence of Preparation Method on the Structural, Linear and Nonlinear Optical Properties of TiN Nanoparticles

2021 ◽  
Author(s):  
Mahdi Safa ◽  
Yasser Rajabi ◽  
Mahdi Ardyanian
Keyword(s):  
Optical Properties ◽  
Titanium Nitride ◽  
Nonlinear Optical ◽  
Sol Gel ◽  
Tin Nanoparticles ◽  
Vis Spectroscopy ◽  
Optical Applications ◽  
Co Precipitation ◽  
Optical Behavior ◽  
Saturation Absorption

Abstract In this paper, titanium nitride nanoparticles were prepared in three methods, In the first method, titanium nitride nanoparticles were prepared by the Ball-mill method; in the second and third methods, the nanoparticles were synthesized by the sol-gel, and the co-precipitation methods. The samples were characterized by X-ray diffraction (XRD), UV-Vis spectroscopy, and scanning electron microscopy (SEM), for the study of structural, linear optical properties, and surface morphology study, respectively. The Z-scan technique was utilized to study the TiN nanoparticles nonlinearity. A change in nonlinear optical behavior with an increase in input pump power and concentration of the TiN nanoparticles was observed. Results showed that the TiN nanoparticles give new potentials in nonlinear optical applications. The nonlinear optical behavior of the TiN nanoparticles shifts from inverse saturation absorption to saturation absorption with increase of intensity.

scholarly journals Kinetic properties and structural analysis of LaCrO3 nanoparticles

2017 ◽  
Vol 35 (2) ◽  
pp. 368-373 ◽  
Author(s):  
Morteza Enhessari ◽  
Ali Salehabadi ◽  
Asma Khoobi ◽  
Razie Amiri
Keyword(s):  
Activation Energy ◽  
Optical Properties ◽  
Structural Analysis ◽  
Sol Gel ◽  
Complexing Agent ◽  
Kinetic Properties ◽  
Particle Sizes ◽  
Xrd Pattern ◽  
Degradation Activation Energy ◽  
Stoichiometric Proportion

Abstract LaCrO3 perovskite nanopowders were successfully prepared via a sol-gel method using stoichiometric proportion of materials containing lanthanum and chromium in stearic acid complexing agent. Structural analysis of LaCrO3 indicated an octahedral framework in its XRD pattern bearing crystallite size in the range of 28 nm. The particle sizes were confirmed by morphological scanning of the sample. The optical properties of LaCrO3 nanopowders clearly indicated an interesting optical activity of LaCrO3 in the UV and visible ranges. The degradation activation energy (Ed) was calculated from the output of a moderate thermal programming profile at about 207.97 kJ·mol-1 using Kissinger equation. Capacity, impedance and AC resistance of the perovskites was obtained at 2.970 nF, 2.522 MΩ and 16.19 MΩ, respectively.

The impact of different ZnO growth methods on the electrical and optical properties of a n-ZnO/p-GaN:Mg/c-plane sapphire UV LED

RSC Advances ◽  
2014 ◽  
Vol 4 (26) ◽  
pp. 13593-13600 ◽  
Author(s):  
Songül Fiat Varol ◽  
Derya Şahin ◽  
Michael Kompitsas ◽  
Güven Çankaya
Keyword(s):  
Optical Properties ◽  
Sol Gel ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Zno Films ◽  
Electrical And Optical Properties ◽  
Uv Led ◽  
Gel Technique ◽  
The Impact ◽  
Growth Methods

ZnO films were successfully grown on GaN/sapphire by Pulsed Laser Deposition (PLD) and the sol–gel technique.

Synthesis, Characterization and Magnetic Properties of Cobalt Ferrite Nanoparticles Prepared by Glycine Assisted Sol-Gel Auto-Combustion Technique

2013 ◽  
Vol 209 ◽  
pp. 31-34 ◽  
Author(s):  
A.B. Shinde ◽  
G.H. Kale ◽  
V.N. Dhage ◽  
P.K. Gaikwad ◽  
K.M. Jadhav
Keyword(s):  
Electron Microscopy ◽  
Cobalt Ferrite ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion ◽  
Ray Density ◽  
Combustion Technique ◽  
Scanning Electron

Nano-particles of (38 nm size) cobalt ferrite (CoFe2O4) were synthesized by sol-gel auto-combustion technique using high purity metal nitrates and glycine as a fuel. The characterization studies were conducted by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The analysis of X-ray diffraction pattern suggests that, the prepared CoFe2O4 spinel ferrite possess single phase cubic spinel structure. The most intense peak (311) of the XRD pattern was used to determine the crystallite size. lattice constant and X-ray density were calculated by using XRD data. The values of lattice constant and X-ray density are found to in the reported range but slightly higher as compared to bulk CoFe2O4 sample. The surface morphology of the CoFe2O4samples was examined through scanning electron microscopy (SEM) technique. The result of SEM analysis shows that grain size is of the order of 62 nm. The CoFe2O4 nano-particle exhibit ferromagnetic behavior having saturation magnetization (Ms) and coercivity (Hc) values in the range of 83 emu/gm and 1381 Oe respectively. The high values of saturation magnetization and coercivity gives the evidence of nanocrystalline nature of the prepared CoFe2O4 spinel ferrite.

scholarly journals The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3684
Author(s):  
Kacuk Cikal Nugroho ◽  
Ubaidillah Ubaidillah ◽  
Retna Arilasita ◽  
Margono Margono ◽  
Bambang Hari Priyambodo ◽  
...  
Keyword(s):  
Room Temperature ◽  
Cobalt Ferrite ◽  
Iron Particle ◽  
Magnetorheological Fluid ◽  
Particle Sizes ◽  
Cofe2o4 Nanoparticles ◽  
Calcination Temperatures ◽  
Grain Sizes ◽  
Co Precipitation ◽  
Nanoparticle Additives

This study investigated the effect of adding strontium (Sr)-doped cobalt ferrite (CoFe2O4) nanoparticles in carbonyl iron particle (CIP)-based magnetorheological fluids (MRFs). Sr-CoFe2O4 nanoparticles were fabricated at different particle sizes using co-precipitation at calcination temperatures of 300 and 400 °C. Field emission scanning electron microscopy (FESEM) was used to evaluate the morphology of the Sr-CoFe2O4 nanoparticles, which were found to be spherical. The average grain sizes were 71–91 nm and 118–157 nm for nanoparticles that had been calcinated at 300 and 400 °C, respectively. As such, higher calcination temperatures were found to produce larger-sized Sr-CoFe2O4 nanoparticles. To investigate the rheological effects that Sr-CoFe2O4 nanoparticles have on CIP-based MRF, three MRF samples were prepared: (1) CIP-based MRF without nanoparticle additives (CIP-based MRF), (2) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 300 °C (MRF CIP+Sr-CoFe2O4-T300), and (3) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 400 °C (MRF CIP+Sr-CoFe2O4-T400). The rheological properties of these MRF samples were then observed at room temperature using a rheometer with a parallel plate at a gap of 1 mm. Dispersion stability tests were also performed to determine the sedimentation ratio of the three CIP-based MRF samples.

PREPARATION AND APPLICATION OF HOLLOW SILICA/MAGNETIC NANOCOMPOSITE PARTICLE

2012 ◽  
Vol 06 ◽  
pp. 601-609 ◽  
Author(s):  
CHENG-CHIEN WANG ◽  
JING-MO LIN ◽  
CHUN-RONG LIN ◽  
SHENG-CHANG WANG
Keyword(s):  
Electron Microscope ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Average Diameter ◽  
Magnetic Microsphere ◽  
Buffer Solution ◽  
Spinel Type ◽  
Hollow Silica ◽  
Surface Areas ◽  
Co Precipitation

The hollow silica/cobalt ferrite ( CoFe 2 O 4) magnetic microsphere with amino-groups were successfully prepared via several steps, including preparing the chelating copolymer microparticles as template by soap-free emulsion polymerization, manufacturing the hollow cobalt ferrite magnetic microsphere by in-situ chemical co-precipitation following calcinations, and surface modifying of the hollow magnetic microsphere by 3-aminopropyltrime- thoxysilane via the sol-gel method. The average diameter of polymer microspheres was ca. 200 nm from transmission electron microscope (TEM) measurement. The structure of the hollow magnetic microsphere was characterized by using TEM and scanning electron microscope (SEM). The spinel-type lattice of CoFe 2 O 4 shell layer was identified by using XRD measurement. The diameter of CoFe 2 O 4 crystalline grains ranged from 54.1 nm to 8.5 nm which was estimated by Scherrer's equation. Additionally, the hollow silica/cobalt ferrite microsphere possesses superparamagnetic property after VSM measurement. The result of BET measurement reveals the hollow magnetic microsphere which has large surface areas (123.4m2/g). After glutaraldehyde modified, the maximum value of BSA immobilization capacity of the hollow magnetic microsphere was 33.8 mg/g at pH 5.0 buffer solution. For microwave absorption, when the hollow magnetic microsphere was compounded within epoxy resin, the maximum reflection loss of epoxy resins could reach -35dB at 5.4 GHz with 1.9 mm thickness.

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