Preparation of Nanoscale CuO Powders

2010 ◽  
Vol 113-116 ◽  
pp. 1770-1773 ◽  
Author(s):  
Xi Hua Zhao ◽  
Min Xu
Keyword(s):  
Raw Materials ◽  
Precipitation Method ◽  
Optimum Conditions ◽  
Muffle Furnace ◽  
Factors Affecting ◽  
Direct Precipitation ◽  
Average Grain Size ◽  
Scherrer Formula ◽  
Average Size ◽  
Direct Precipitation Method

Cu(OH)2 precursor was synthesized by direct precipitation method and CuSO4 and NaOH were used as raw materials. Then, Cu(OH)2 precursor was calcined in muffle furnace at 400°C for 2h in order that CuO particle was obtained. Through the analysis of the factors affecting the CuO, the paper determined the optimum conditions for the synthesis of nano-CuO with the direct-precipitation method. Then the paper analyzed phase composition and crystal structure of samples using XRD and calculated the average grain size of samples by Scherrer formula, and observed and analyzed by TEM to characterize the morphology and particle size of samples. The optimum precipitation conditions are as follows: when the precipitation agent is 3.2:1, reaction time 40min and precipitant concentration 0.6mol.L-1. The average size of CuO particle prepared under the conditions is 18nm and the yield is 96%.

Effect of Nano-CuO on Luminous Intensity of Pyrotechnics Composite Containing KClO4 and Al

2012 ◽  
Vol 217-219 ◽  
pp. 669-672
Author(s):  
Shu Hong Ba ◽  
Zhe Zhang ◽  
Ming Hui Yan ◽  
Zhe Xing Sun ◽  
Xin Peng Teng
Keyword(s):  
Thermal Decomposition ◽  
Spherical Shape ◽  
Decomposition Temperature ◽  
Luminous Intensity ◽  
Precipitation Method ◽  
Thermal Decomposition Temperature ◽  
Direct Precipitation ◽  
Analysis Instrument ◽  
Average Size ◽  
Direct Precipitation Method

Nano-CuO had been successfully synthesized by using direct precipitation method. The prepared sample was characterized by XRD. The luminous intensities of pyrotechnics composite containing KClO4, Mg and nano-CuO were measured. The catalysis of CuO nanocrystal on KClO4 was investigated by thermal analysis instrument. The results show that the average size of nano-CuO is 19 nm and has spherical-shape. When nano-CuO is added into the pyrotechnics composites containing KClO4 and Al, it can improve the igniting and burning performance. The luminous intensity of trinary pyrotechnics composite is also greatly increased. On the other hand, nano-CuO can make thermal decomposition temperature of KClO4 to decrease 97.7 °C, the decalescence amount also reduced to 79.07 J/g. It is obviously that nano-CuO has strong catalysis to KClO4 thermal decomposition. The conclusion is consistent with the measure results of luminous intensity.

Influence of Calcining Temperature on the Microstructure of LaPO4 Powders

2009 ◽  
Vol 79-82 ◽  
pp. 2231-2234
Author(s):  
Zi Feng Liu ◽  
Xin Wang ◽  
Yan Sheng Yin ◽  
Qiang Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Grain Shape ◽  
Raw Materials ◽  
Precipitation Method ◽  
X Ray ◽  
Direct Precipitation ◽  
Direct Precipitation Method ◽  
Scanning Electron

Nanometer LaPO4 powders were synthesized by liquid-liquid direct precipitation method. La(NO3)3•6H2O and (NH4)3PO4•3H2O were used as raw materials. The calcining temperature was 900°C, 1000°C, 1100°C, respectively. DTA result shows that the LaPO4 precursor is LaPO4•4H2O. The calicined powders were characterized by X-ray powder diffraction (XRD) and Scanning Electron Microscope (SEM), and exhibited a pure LaPO4 phase with a monazite structure about 50-100 nm in diameter size. With the calcining temperature increasing, the crystallization of the LaPO4 became better and the grain shape changed from elongated grain shape to spherical grain shape.

One-step growth of isoreticular luminescent metal–organic frameworks on cotton fibers

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15198-15204 ◽  
Author(s):  
R. R. Ozer ◽  
J. P. Hinestroza
Keyword(s):  
Metal Organic Frameworks ◽  
Precipitation Method ◽  
Cotton Fibers ◽  
Direct Precipitation ◽  
Metal Organic ◽  
One Step ◽  
Lanthanide Metal ◽  
Step Growth ◽  
Direct Precipitation Method ◽  
Temperature Water

A series of isoreticular lanthanide metal–organic frameworks, Ln-MOFs (Ln = Eu, Gd, and Tb), were directly grown on cotton fibers using a room temperature water-based direct precipitation method.

Transesterification of Jatropha Oil to Biodiesel by Using Catalyst Containing Ca(C3H7O3)2 as a Solid Base Catalyst

2013 ◽  
Vol 666 ◽  
pp. 93-102 ◽  
Author(s):  
Chang Jun Li ◽  
Zhi Wei Huang ◽  
Yu Jie He ◽  
Dong Zhou ◽  
Cheng Du ◽  
...  
Keyword(s):  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Solid Base ◽  
Jatropha Oil ◽  
Direct Precipitation ◽  
Acid Methyl ◽  
Direct Precipitation Method ◽  
C Nmr

An direct precipitation method of Calcium glyceroxide Ca(C3H7O3)2 was proposed. The prepared Ca(C3H7O3)2 was effective in transesterification of Jatropha oil into fatty acid methyl esters (FAME). The Ca(C3H7O3)2 catalysts were characterized by using XRD, solid state 13C-NMR, FTIR, and Hammett indicator. The influence of various reaction variables on the conversion was investigated. Under a condition of methanol/oil molar ratio of 9:1, a catalyst amount of 4 wt %, reaction time of 1.5 h, and reaction temperature of 65 °C, over 95% of biodiesel yield was obtained.

A simple approach for the synthesis of bi-functional Fe3O4@MgO core–shell nanoparticles with magnetic-microwave to heat responsive properties

2016 ◽  
Vol 40 (9) ◽  
pp. 7911-7916 ◽  
Author(s):  
Hongxia Peng ◽  
Xiang Wang ◽  
Chuanyue Hu ◽  
Jilin Hu ◽  
Xiuying Tian
Keyword(s):  
Simple Approach ◽  
Precipitation Method ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Mgo Nanoparticles ◽  
Direct Precipitation ◽  
Core Shell Nanoparticles ◽  
Direct Precipitation Method

We prepared Fe3O4@MgO nanoparticles with magnetic and microwave to heat responsive properties by a direct precipitation method.

Effect of Calcination Temperature on Phase Transformation and Microstructure of Al2O3/GdAlO3 Compound Powder Prepared by Co-Precipitation Method

2012 ◽  
Vol 512-515 ◽  
pp. 535-538 ◽  
Author(s):  
Shuai Sun ◽  
Qiang Xu
Keyword(s):  
Calcination Temperature ◽  
Raw Materials ◽  
Metastable Phase ◽  
Precipitation Method ◽  
Calcination Process ◽  
Compound Powder ◽  
Average Grain Size ◽  
Different Temperatures ◽  
Diffraction Peaks ◽  
Co Precipitation

A Coprecipitation Method Was Applied to Synthesize Al2O3/GdAlO3 Compound Powder, Using Ammonia as the Precipitator. Gadolinium Oxide and Aluminium Nitrate Were Used as the Raw Materials with the Eutectic Ratio( 77 mol% Al 3+ – 23 mol% Gd 3+ ). the Precursor Was Calcined at Different Temperatures from 1200 to 1600 °C. the Phase Identifications at Different Temperatures Were Characterized by X-ray Diffractometry (XRD). the Growth Morphology of Particles Were Investigated Using Field Emission Electro Microscopy (FE-SEM). the Results Reveal that GdAlO3 Crystallized Earlier than α-Al2O3. the Diffraction Peaks of α-Al2O3 Phase Were Observed after Calcination at 1300°C for 1 H. Metastable Phase Gd3Al5O12 Underwent Complete Decomposition at 1600°C for 1 H. Gadolinium Aluminate and α-Al2O3 Showed Different Growth Mechanism during the Calcination Process. the Average Grain Size of the Calcined Powder Increased from ~40 to ~900 Nm as the Calcination Temperature Increased from 1200 to 1600 °C.

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