Synthesis of Sm–Co nanoparticles by sol–gel method

2018 ◽  
Vol 32 (34n36) ◽  
pp. 1840069 ◽  
Author(s):  
Wei Wu ◽  
Jinshan Zhang ◽  
Pengjun Cao ◽  
Jiling Dong ◽  
Hao Ding
Keyword(s):  
Sol Gel ◽  
Reduction Process ◽  
Treatment Temperature ◽  
Complexing Agents ◽  
Microstructural Investigation ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir ◽  
Co Nanoparticles ◽  
Reductive Annealing

Sm–Co nanoparticles have promising applications in both scientific and industrial fields. In this paper, Sm–Co single-crystal nanoparticles were prepared using respective metal salts and complexing agents, such as citric acid by Pechini-type sol–gel method. The mixture solution was heated to form a highly viscous gel, and then heated at different temperatures to achieve SmCo-oxide. And then Sm–Co particles were yielded by reductive annealing of the precursors. Phase analysis, microstructural investigation and magnetic properties were performed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), Fourier transform infrared (FT-IR) and VSM. TGA trace analysis of the gel determined the heat treatment temperature. XRD results showed that SmCoO3 and Co3O4 were obtained at 800[Formula: see text]C, FT-IR spectrometry analysis also verified the results. In the calcium-thermal reduction process, Sm2O3 and Co were obtained after reductive annealing at 800[Formula: see text]C, meanwhile Sm–Co nanoparticles were formed at 850[Formula: see text]C. FESEM analysis revealed that the Sm–Co nanoparticles were composed in the form of spherical granules and exhibited well distribution with size in the range of 100 nm. The room temperature saturation magnetization and coercivity of the Sm–Co nanoparticles were 49.61 emu/g and 3.53 kOe, respectively.

Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ Nanometer Powders by Sol-Gel Method and Research about its Electrochemical Performance

2013 ◽  
Vol 712-715 ◽  
pp. 257-261
Author(s):  
Yin Lin Wu ◽  
Qing Hui Wang ◽  
Ling Wang ◽  
Hai Yan Zhao
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Electrochemical Performance ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Preparation Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

The La0.75Sr0.25Cr0.5Mn0.5O3-δnanometer powders were prepared by citric acid sol-gel method.The samples were characterized by DTA, FT-IR, XRD, TEM techniques. The preparation process, morphology of synthesized powders, the best heat-treatment temperature and the electrochemical performance had been studied. The results show that the spherical nanometer powders can be obtained and the best heat-treatment temperature is 800°C. The particle size is about 30nm and Ea is 0.071 eV.

scholarly journals The structural studies of aluminosilicate gels and thin films synthesized by the sol-gel method using different Al2O3 and SiO2 precursors

2015 ◽  
Vol 33 (4) ◽  
pp. 732-741 ◽  
Author(s):  
Anna Adamczyk
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Porous Ceramics ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Coating Method ◽  
Different Temperatures ◽  
Ft Ir

AbstractAluminosilicate materials were obtained by sol-gel method, using different Al2O3 and SiO2 precursors in order to prepare sols based on water and organic solvents. As SiO2 precursors, Aerosil 200TM and tetraethoxysilane TEOS: Si(OC2H5)4 were applied, while DisperalTM and aluminium secondary butoxide ATSB: Al(OC4H9)3 were used for Al2O3 ones. Bulk samples were obtained by heating gels at 500 °C, 850 °C and at 1150 °C in air, while thin films were synthesized on carbon, steel and alundum (representing porous ceramics) substrates by the dip coating method. Thin films were annealed in air (steel and alundum) and in argon (carbon) at different temperatures, depending on the substrate type. The samples were synthesized as gels and coatings of the composition corresponding the that of 3Al2O3·2SiO2 mullite because of the specific valuable properties of this material. The structure of the annealed bulk samples and coatings was studied by FT-IR spectroscopy and XRD method (in standard and GID configurations). Additionally, the electron microscopy (SEM) together with EDS microanalysis were applied to describe the morphology and the chemical composition of thin films. The analysis of FT-IR spectra and X-ray diffraction patterns of bulk samples revealed the presence of γ-Al2O3 and δ-Al2O3 phases, together with the small amount of SiO2 in the particulate samples. This observation was confirmed by the bands due to vibrations of Al–O bonds occurring in γ-Al2O3 and δ-Al2O3 structures, in the range of 400 to 900 cm−1. The same phases (γ-Al2O3 and δ-Al2O) were observed in the deposited coatings, but the presence of particulate ones strongly depended on the type of Al2O3 and SiO2 precursor and on the heat treatment temperature. All thin films contained considerable amounts of amorphous phase.

Preparation of ZnFe2O4 Nanometer Powders by Sol-Gel Method and Research about its Electrochemical Performance

2013 ◽  
Vol 743 ◽  
pp. 179-182 ◽  
Author(s):  
Yin Lin Wu ◽  
Qing Hui Wang ◽  
Ling Wang ◽  
Hai Yan Zhao
Keyword(s):  
Heat Treatment ◽  
Electrochemical Performance ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Preparation Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir ◽  
Xrd Techniques

The ZnFe2O4 nanometer powders were prepared by EDTA sol-gel method. The samples were characterized by DTA, FT-IR, XRD techniques. The preparation process, the best heat-treatment temperature and the electrochemical performance had been studied. The results show that the spherical nanometer powders can be obtained and the best heat-treatment temperature is 900°C. The particle size is about 10nm and Ea is 0.88 eV.

The Structural, Magnetic and Optical Properties of Ni-Mg-Zn Ferrite Prepared With Different Complexing Agents via Sol-Gel Method

2021 ◽  
Author(s):  
Yanchun Zhang ◽  
Aimin Sun ◽  
Zhaxi Suonan
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Sol Gel ◽  
Complexing Agents ◽  
Complexing Agent ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Zn Ferrite ◽  
Vis Spectroscopy

Abstract Different complexing agents were used to prepare Ni-Mg-Zn ferrite with the composition formula Ni0.2Mg0.2Zn0.6Fe2O4 via sol-gel method, which included citric acid, oxalic acid, egg white and EDTA. The Ni0.2Mg0.2Zn0.6Fe2O4 ferrite with no complexing agent was also prepared as a comparison. The chemical phases of samples were analyzed by the X-ray diffraction (XRD), which indicated that samples had spinel phase structure. The lattice constants of samples are in the range of 8.3980 ~ 8.4089 Å. The composition and structure were further studied by fourier transform infrared spectroscopy (FTIR). There were two typical characteristic bands related to the stretching vibrations of spinel ferrite in FTIR spectra. Scanning electron microscope (SEM) micrographs and transmission electron microscope (TEM) images showed that the particles have the shape of spherical cube. Energy dispersive spectrometer (EDS) analyzed the elements and ingredients of samples, which included Ni, Mg, Zn, Fe and O. X-ray photoelectron spectroscopy (XPS) is used to examine further the elemental composition and chemical state of sample prepared with EDTA as complexing agent. The optical properties of samples were investigated by photoluminescence spectra and UV-Vis spectroscopy. Vibrating sample magnetometer (VSM) was used to characterize magnetic properties, hysteresis loops revealed the ferrimagnetism behavior of prepared samples.

Studying on Preparation of AZO Thin Films with Sol-Gel Method

2010 ◽  
Vol 152-153 ◽  
pp. 868-873 ◽  
Author(s):  
Xiu Ling Lv ◽  
Yu Bo Dou ◽  
Juan Wang ◽  
Ying Xu
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Zno Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Crystallization Properties ◽  
Doped Zno ◽  
Micro Morphology

Al doped ZnO thin films（AZO films） was prepared by sol-gel method. The influence of Parameters of different processes on the crystallization properties, micro-morphology and optical properties of this kind of films were studied, using by X-ray diffractometer, filed emission stereoscan, spectral photometer, hall admeasuring apparatus. The results indicated that the crystallization properties, micro-morphology and optical properties of Al doped ZnO films were best on the condition that the sol density was 0.5mol/L, hat treatment temperature is 600 and there is a 8-layer coating.

scholarly journals Al2O3 + Graphene Low-Friction Composite Coatings Prepared By Sol–Gel Method

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 858
Author(s):  
Bożena Pietrzyk ◽  
Sebastian Miszczak ◽  
Ye Sun ◽  
Marcin Szymański
Keyword(s):  
Tribological Properties ◽  
Composite Coatings ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Treatment Temperature ◽  
Graphene Nanoplatelets ◽  
Low Friction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Graphene Composite

In this work, Al2O3 + graphene coatings were prepared using the sol–gel method. The aim of the study was preliminary determination of the influence of size and amount of graphene nanoplatelets on morphology, chemical structure, and basic tribological properties of Al2O3 + graphene composite coatings. Two types of reduced graphene oxide (rGO) nanoplatelets with different lateral size and thickness were used to prepare the coatings. To characterize them, scanning electron microscope (SEM), glow discharged optical emission spectrometer (GDOES), Fourier-transform infrared (FTIR), reflectance spectrometer, and ball-on-disk tribological tests were used. It was found that the presence of graphene in the Al2O3 + graphene coatings did not fundamentally change the chemical transformation of ceramic Al2O3 matrix. Morphology examinations of coatings containing larger graphene nanoplatelets revealed a tendency to their parallel arrangement in relation to the coated surface. The tribological properties of Al2O3 + graphene coatings turned out to be strongly dependent on the size of graphene nanoplatelets as well as on the heat treatment temperature. The friction coefficient as low as 0.11 and good durability were obtained for the Al2O3 + graphene coating with larger nanoplatelets and heat-treated at 500 °C. The results of conducted research indicate the potential use of Al2O3 + graphene composite coatings prepared by the sol–gel method as low-friction ceramic coatings.

Preparation of TiO2/Bamboo Charcoal Photocatalysts with Sol-Gel Method

2012 ◽  
Vol 557-559 ◽  
pp. 1457-1460 ◽  
Author(s):  
Chang Bin Xia ◽  
Chun Hua Liu ◽  
Dao Xin Wu
Keyword(s):  
Ir Spectra ◽  
Sol Gel ◽  
Bamboo Charcoal ◽  
Gel Method ◽  
Sol Gel Method ◽  
Reflective Spectrum ◽  
Ft Ir ◽  
Bamboo Carbon

TiO2/bamboo charcoal complex photocatalysts has been prepared for tetra-n-butyltitanate as titanium source, bamboo carbon (BC) as the carrier with Sol-Gel method.it Characterizations were analyzed using TGA, DSC, SEM, XRD, DRS (diffuse reflective spectrum) and FT-IR spectra.

scholarly journals Growth and Spectral Investigation on Pure Calcium Phosphate Doped With (Copper and Magnesium) Crystals

2021 ◽  
pp. 322-332
Author(s):  
R. Selvaraju ◽  
M. Bhuvaneswari
Keyword(s):  
Calcium Phosphate ◽  
Sol Gel ◽  
Gallbladder Stone ◽  
Calcium Stones ◽  
Gel Method ◽  
Sol Gel Method ◽  
Gallbladder Stones ◽  
Dta Analysis ◽  
Ft Ir

Calcium stones are most commonly occurring form of cholelithiasis or gallbladder stones most one of the oldest and common afflictions of humans. Calcium phosphate is dissolved minerals in causes of renal to gallbladder stone in both human and animals. Of course, the calcium phosphate is one of the components of gallbladder. Calcium phosphate doped with (Cu and Mg) are crystals are grown by sol-gel method. In the present work the growth and characterization of pure and doped with (Cu and Mg) crystals. The grown crystals were characterization by FT-IR, SEM-EDX and TG/DTA analysis.

scholarly journals Synthesis of Metal Doped TiO2 Nano-Composites by Sol-Gel Method and Their Structural Properties

2020 ◽  
Vol 6 (3) ◽  
pp. 915-917
Author(s):  
Rajani Altaf ◽  
Sharma Jyoti ◽  
Dave Pranav
Keyword(s):  
Metal Oxide ◽  
Sol Gel ◽  
Nano Composites ◽  
Gel Method ◽  
Doped Tio2 ◽  
Sol Gel Method ◽  
Ir Studies ◽  
Good Crystallinity ◽  
Ft Ir ◽  
Metal Doped

Metal oxide nano-composites plays a very important role in many areas of chemistry, physics and material science. This paper explains the synthesis and comparison of zinc and zirconium doped TiO2 metal oxide nano-composites and their different properties. Here the sol-gel method is used to synthesis both the nano-composites. Nano-composites have been characterized with XRD, AFM, Zetasizer & potential and FT-IR studies. XRD study revealed good crystallinity with the size range of 30 nm – 45 nm for both nano-composites. AFM studies also revealed the same. FTIR study reports the characteristics peaks of synthesised nano-composites.

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