Synthesis and Characterization of Nanocrystalline Ceria Powder through Homogeneous Precipitation Method

2012 ◽  
Vol 557-559 ◽  
pp. 567-571
Author(s):  
Jin Liang ◽  
Hong Chen
Keyword(s):  
Particle Size ◽  
Orthogonal Experiment ◽  
Fluorite Structure ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Nanocrystalline Ceria

Nanocrystalline ceria powder was prepared through homogeneous precipitation method, orthogonal experiment was designed to figure out the most important factor that influence the particle size of the resultant and the optimum condition. X-ray diffraction revealed that the as-prepared nanoscale ceria powder had cubic fluorite structure, TEM image showed that the ceria powder was weakly agglomerated with a particle size of about 10 nm.

Synthesis and Characterization of Hexagonal Prismatic Ca10(PO4)6(OH)2 Prepared by Homogeneous Precipitation Method

2011 ◽  
Vol 391-392 ◽  
pp. 1239-1243
Author(s):  
Zhan Hui Zhang ◽  
Zhi Liang Huang ◽  
Jian Qiu Li ◽  
Ru An Chi ◽  
Yue Hua Hu ◽  
...  
Keyword(s):  
Growth Process ◽  
Crystal Morphology ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Hexagonal Prism ◽  
Homogeneous Precipitation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Homogeneous Precipitation Method

Hexagonal prismatic hydroxyapatite (Ca10(PO4)6(OH)2, HAP) was successfully prepared by a homogeneous precipitation method. The products were characterized by X-ray diffraction, Fourier transform infrared spectrum, and scanning electron microscope. The growth process of the hexagonal prism was surveyed in detail based on the effects of the reaction time on the phase composition and the crystal morphology.

Synthesis and characterization of TiO2 nanocrystalline powder prepared by homogeneous precipitation using urea

2003 ◽  
Vol 18 (3) ◽  
pp. 571-577 ◽  
Author(s):  
Dong Seok Seo ◽  
Hwan Kim ◽  
Hang Chul Jung ◽  
Jong Kook Lee
Keyword(s):  
Particle Size ◽  
Particle Shape ◽  
Elevated Temperatures ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
Nanocrystalline Powder ◽  
Homogeneous Precipitation ◽  
Homogeneous Precipitation Method ◽  
Good Crystallinity

TiO2 nanocrystalline powder was synthesized by homogeneous precipitation method using urea, and its characteristics were investigated through comparison with the powder prepared by conventional precipitation using ammonia. The homogeneously precipitated powder was anatase-type TiO2 with a particle size of 4–5 nm and a uniform spherical particle shape. The fact that the transformation from anatase to rutile was prohibited at elevated temperatures in the homogeneously precipitated powder can be useful to prepare anatase-type TiO2 thin films by calcination at high temperatures. With increasing heat-treatment temperature, the particle size of the homogeneously precipitated powder was smaller than that of the conventionally precipitated powder, and the particle shape was more uniform. The homogeneously precipitated powder showed good photocatalytic activity for Ag ion photoadsorption because the powder had both good crystallinity and a large specific surface area of 280 m2/g.

Synthesis of Porous Basic Magnesium Carbonate Crystallographic Materials with Flower-Like Structure

2016 ◽  
Vol 723 ◽  
pp. 444-449 ◽  
Author(s):  
Juan Chen ◽  
Zhi Liang Huang ◽  
Wen Zhao Li
Keyword(s):  
Electron Microscopy ◽  
Magnesium Carbonate ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Experimental Equipment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Chloride Hexahydrate ◽  
Scanning Electron

The porous basic magnesium carbonate (Mg5(CO3)4(OH)2.4H2O) crystal crystallographic materials with flower-like structure were prepared successfully by homogeneous precipitation method. Magnesium chloride hexahydrate (MgCl2.6H2O) and urea (CO(NH2)2) wereused as reaction materials. The experimental equipment was held at 100°C for 8 h. Phase and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The formation mechanism of the product was investigated. It was found that the CO2 bubbles acted as porous templates. The growth and gathering of the CO2 bubbles induced the growth of the MgCO3.3H2O columnar crystals. Then the dissolution of the MgCO3.3H2O and the deposition of Mg5(CO3)4(OH)2.4H2O happened simultaneously. Finally the disappearance of MgCO3.3H2O brought about the formation of the porous structure.

Synthesis and Characterization of BaCO3 Nanoparticles with Different Morphologies by Microwave Homogenous Precipitation

2013 ◽  
Vol 32 (1) ◽  
pp. 47-50
Author(s):  
Guo Chen ◽  
Jin Chen ◽  
Lijun Liu ◽  
C. Srinivasakannan ◽  
Jinhui Peng
Keyword(s):  
Raw Materials ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Homogeneous Precipitation ◽  
Tetraacetic Acid ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Scanning Electron ◽  
Composition Of Products

AbstractBaCO3 nanoparticles with different morphologies including needle-like, rod-like, bird's nest-like and flower-like have been successfully synthesized by the microwave homogeneous precipitation method using BaCl2·2H2O, NaOH and (NH2)2CO as raw materials with the help of different guide reagents, such as citric acid (CA), sodium triphosphate (STPP) and ethylene diamine tetraacetic acid (EDTA). Their phases and morphologies were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), respectively. The characterization results show that different guide reagents have little effect on the phase structure and composition of products while they play significant roles in determining the morphology of products. All the synthesized BaCO3 nanoparticles have typical orthorhombic structures that are well-crystallized.

SYNTHESIS AND CHARACTERIZATION OF α-Fe2O3@ATO NANOCOMPOSITE PARTICLES

2008 ◽  
Vol 15 (05) ◽  
pp. 545-550 ◽  
Author(s):  
YIN-CUN ZHU ◽  
JI-SEN JIANG
Keyword(s):  
Weight Ratio ◽  
Precipitation Method ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Nanocomposite Particles ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Treatment Conditions ◽  
Transmission Electron

α- Fe 2 O 3@ATO (antimony doped tin oxide) nanocomposite particles with core–shell structure were prepared by homogeneous precipitation method using monodispersed α- Fe 2 O 3 (hematite) nanoparticles as cores, SnCl 4 · 5 H 2 O and SbCl 3 as the precursor of the shell. The morphology and structure of the nanocomposite particles were studied with transmission electron microscopy and X-ray diffraction, respectively. The electricity properties of the nanocomposite were also investigated in terms of coating amount, molar ratio of element Sb to Sn , and heat treatment conditions. The results showed that the conditions of ATO/α- Fe 2 O 3 (weight ratio) = 70%, n( Sb )/n( Sn ) = 10%, calcined at 700°C for 1 h were optimal for the conductivity of the nanocomposite.

Preparation and Characterization of Nano Zinc Borate/Epoxide Resin Composite

2013 ◽  
Vol 567 ◽  
pp. 87-90
Author(s):  
Ping Qiang Gao ◽  
Wen Hua Song ◽  
Xing Wang
Keyword(s):  
Resin Composite ◽  
Zinc Borate ◽  
Precipitation Method ◽  
Sodium Borate ◽  
Epoxide Resin ◽  
X Ray Diffraction ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Nano Zinc

A nano zinc borate wasprepared via coordination homogeneous precipitation method using sodium borate (Na2B4O7•10H2O)and zinc borate nitrate (Zn (NO3)2•6H2O). The characterizations of theas-obtained samples were studied by X-ray diffraction(XRD), Field-emissionscanning electron microscopy (FESEM), Fourier transform infrared spectrum(FTIR) and differential thermal analysis (TG–DTA) It had been found that theproducts had excellent inflaming retarding effect for epoxide resin.

Preparation and Optical Properties of Y2O3:Tb3+ Nanoballs

2016 ◽  
Vol 16 (4) ◽  
pp. 3886-3889 ◽  
Author(s):  
Hongquan Yu ◽  
Ye Qi ◽  
Yanbo Wu ◽  
Jinsu Zhang ◽  
Baojiu Chen
Keyword(s):  
Optimum Concentration ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Particle Sizes ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Scanning Electron Microcopy ◽  
Scanning Electron

Y2O3:Tb3+ nanoballs were synthesized via the urea homogeneous precipitation method (UPM). The resulting Y2O3:Tb3+ phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy, ultraviolet-visible (UV-vis) absorption spectra, and general photoluminescence spectra. The particle sizes estimated using X-ray diffractometry and scanning electron microcopy were about 50–200 nm. The emission intensity of the Y2O3:Tb3+ was low when the doping concentrations of Tb3+ were higher. The optimum concentration of Tb3+ for synthesis of Y2O3:Tb3+ nanocrystals is 1%.

Influence of Synthesis Technics and Additives on Cerium Ion Compound Valence

2011 ◽  
Vol 335-336 ◽  
pp. 1051-1055
Author(s):  
Yan Mei ◽  
Chuan Xia ◽  
Xiao Li Chen ◽  
Zuo Ren Nie
Keyword(s):  
Coupling Method ◽  
Precipitation Method ◽  
Urea Solution ◽  
Homogeneous Precipitation ◽  
State Change ◽  
X Ray Diffraction ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Transmission Electron ◽  
Cerium Ion

In the system of Ce(NO3)3·6H2O and urea solution during homogeneous precipitation method, hydrothermal homogeneous precipitation coupling method and homogeneous precipitation method with additive, X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to study and characterize the product structures and morphologies. The outer electron configurations and the energy conservation theory were used to analyze the reasons for stability of products and valence state change of cerium ions. The results showed that synthesis technics and additives had a great effect on the cerium ion compound valence. The products were orthorhombic Ce2O(CO3)2·H2O with Valence Ш and orthorhombic CeO(CO3)2·H2O with valence Ⅵ by using homogeneous precipitation method and hydrothermal homogeneous precipitation coupling method, respectively. If an additive (triethanolamine or triethylamine) was added into the homogeneous precipitation system, the products changed into a mixture of orthorhombic CeO(CO3)2·H2O with Valence Ⅵ and cubic CeO2 with valence Ⅳ. It showed that triethanolamine or triethylamine had strong oxidizing properties and played a catalyst role in the reaction.

Preparation of α-Ni(OH)2 with Flowerlike Hierarchical Architectures via Homogeneous Precipitation Method

2011 ◽  
Vol 284-286 ◽  
pp. 684-687
Author(s):  
Chang Yu Li ◽  
Li Li Liu ◽  
Shou Xin Liu
Keyword(s):  
Electron Microscopy ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
X Ray ◽  
Homogeneous Precipitation Method ◽  
Α Phase ◽  
Transmission Electron ◽  
Hierarchical Architectures ◽  
Flowerlike Structure ◽  
Adsorption Desorption

Without using any templates or surfactants, flowerlike α-nickel hydroxide (Ni(OH)2) was successfully synthesized by homogeneous precipitation method. The prepared products were characterized by X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and N2 adsorption-desorption. The prepared Ni(OH)2 is α-phase with specific surface area of 245.0 m2/g and shows flowerlike structure with 4-6 um in diameter.

scholarly journals Synthesis and characterization of apatite silicated powders with wet precipitation method

2021 ◽  
Vol 234 ◽  
pp. 00106
Author(s):  
Houda Labjar ◽  
Hassan Chaair
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Analytical Techniques ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wet Precipitation ◽  
Scanning Electron

The synthesis of apatite silicated Ca10(PO4)6-x(SiO4)x(OH)2-x (SiHA) with 0≤x≤2 was investigated using a wet precipitation method followed by heat treatment using calcium carbonate CaCO3 and phosphoric acid H3PO4 and silicon tetraacetate SiC8H20O4 (TEOS) in medium of water ethanol, with three different silicate concentrations. After drying, the samples are ground and then characterized by different analytical techniques like X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning electron Microscopy (SEM) and chemical analysis.

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