Simple Preparation of Well-Dispersed Nanosized α-Fe2O3

2014 ◽  
Vol 513-517 ◽  
pp. 78-81
Author(s):  
Yu Ping Tong ◽  
Chen Zheng ◽  
Chao Li Yu ◽  
Xin Yue Fang ◽  
Yong Qiang Zhang ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Raw Materials ◽  
Low Cost ◽  
Combustion Method ◽  
Absorption Peak ◽  
Broad Absorption ◽  
Broad Absorption Peak ◽  
Dispersed Particles ◽  
Simple Preparation ◽  
Average Size

Well-dispersed α-Fe2O3 nanocrystalline was prepared by a convenient self-propagation combustion method using low-toxic glycine as fuel, low-cost Fe (NO3)2·9H2O as raw materials. The XRD results indicate that the glycine doses have an important effect on the control of the average size and the order of the crystalline phase. The UV-vis results indicate that the α-Fe2O3 nanocrystals prepared by this method have a broad absorption peak whose center is at about 221 nm. TEM images revealed that the products were composed of well-dispersed particles with an average size about 35 nm.

Influence of Nitrogen Pressure and TiN Addition on Combustion Synthesis of Ti2AlN Powders

2012 ◽  
Vol 624 ◽  
pp. 5-8
Author(s):  
Jia Jin Tian ◽  
Feng Rui Zhai ◽  
Li Li Zhang ◽  
Hong Wei Zhang ◽  
Zhong Zhou Yi
Keyword(s):  
Combustion Synthesis ◽  
Raw Materials ◽  
Low Cost ◽  
Synthesis Method ◽  
Nitrogen Compound ◽  
Combustion Method ◽  
Nitrogen Pressure ◽  
Small Sample ◽  
Optimum Process ◽  
Xrd Diffraction

It has a relatively rapid reaction with self-propagating combustion method to synthesize Ti-Al-N powder. This can effectively avoid uneven phenomenon of aluminum melting reunion during the reaction of raw materials. So you can use lower-cost aluminum as raw materials. In addition, the combustion synthesis method also has a simple process and low-cost advantage. Thus this method has the potential to become the optimum process method to prepare Ti2AlN and Ti4AlN3. In this paper, Ti, Al elemental powders and N2 were used as raw materials. The powder of Ti2AlN was successfully prepared for the first time by combustion synthesis method. This substance is a nitrogen compound of single-phase and three yuan. The results from the XRD diffraction analysis and SEM show that synthetic product is high purity Ti2AlN with a small sample to combustion synthesis when the pressure of nitrogen is in 5 MPa, but the content of synthesis products Ti2AlN is small when the sample is magnified, and the TiN and AlN has a higher content. It can burn synthetic Ti2AlN to control the nitrogen pressure and add the amount of TiN, and the pressure of N2 is better 2 MPa, and the amount of TiN added is better 30 wt.%.

Square-Shaped Nd2Sn2O7 Nanocrystals Prepared by Salt-Assistant Combustion Method

2012 ◽  
Vol 238 ◽  
pp. 79-82
Author(s):  
Yu Ping Tong ◽  
Xi Chen ◽  
Shun Bo Zhao ◽  
Lu De Lu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Cost ◽  
Combustion Process ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Pyrochlore Type ◽  
Ft Ir ◽  
Average Size

Ultrafine square-shaped pyrochlore-type Nd2Sn2O7 nanocrystals were synthesized by a convenient salt-assisted combustion process using glycine as fuel. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, Transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The results indicate that the products are phase-pure nanocrystals with pyrochlore-type structure. TEM and HRTEM images reveal that the products are composed of well-dispersed square-shaped Nd2Sn2O7 nanocrystals with the average size of 30 nm and the crystallite is structurally uniform and crystalline. The presented method provides a convenient and low-cost route for the synthesis of oxide materials nanostructures.

scholarly journals Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

2021 ◽  
Vol 10 (2) ◽  
pp. 291-300
Author(s):  
Zhilei Wei ◽  
Kang Li ◽  
Bangzhi Ge ◽  
Chaowei Guo ◽  
Hongyan Xia ◽  
...  
Keyword(s):  
Particle Size ◽  
Combustion Temperature ◽  
High Efficiency ◽  
Raw Materials ◽  
Low Cost ◽  
Synthesis Method ◽  
Preparation Methods ◽  
Average Size ◽  
Micrometer Size

AbstractSpherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 µm were successfully synthesized via an in-situ combustion synthesis method. The effect of N2 pressure, NH4Cl content, and Al particle size on the combustion reaction procedure, phase composition, and microstructure of the products was systematically investigated. The results showed that the decreased N2 pressure, increased NH4Cl content, and Al particle size led to the decreasing of combustion temperature and speed, which further affected the morphology of the products. As a result, low N2 pressure (0.2 MPa), a small amount of NH4Cl (0.5 wt%), and fine Al particles (∼2.5 µm) contributed to a moderate combustion temperature and facilitated the formation of nearly spherical AlN particles. In addition, based on the gas-releasing assisted quenching experiments and thermo-kinetic analysis, a two-step growth mechanism for the nearly spherical AlN particles was rationally proposed. The present method shows the advantages of low cost and high efficiency for preparing nearly spherical AlN particles, which can be used as raw materials for electronic substrates and fillers for packaging materials.

scholarly journals The new evidence from the fingerprint region in FT-IR spectra to indicate the heat treatment of blue sapphire sample

2021 ◽  
Vol 2145 (1) ◽  
pp. 012023
Author(s):  
A Phlayrahan ◽  
H Homkhajorn
Keyword(s):  
Heat Treatment ◽  
Ir Spectra ◽  
Absorption Peak ◽  
Blue Color ◽  
Broad Absorption ◽  
Broad Absorption Peak ◽  
Significant Difference ◽  
Ft Ir ◽  
Fingerprint Region ◽  
New Evidence

Abstract FT-IR spectroscopy is a significant method to detect the heat treatment of gemstones, especially ruby and sapphire. There are a set of certain peaks, i.e., 3309, 3232, and 3185 cm−1 in the FT-IR spectra used as an indicator to determine whether the samples have been undergone heat treatment. In this study, however, new evidence has emerged. The O-Al-O bending vibration peak at the fingerprint region around 600-700 cm−1 has been suggested as new clues to define the heated stones. The blue sapphire samples were prepared, then the heat treatment was performed separately at 800, 1000, 1200, 1400, and 1650 °C under an oxidizing atmosphere with a soaking time of 1 hour. The energy dispersive X-ray fluorescence (EDXRF) shows that there is no significant difference in the chemical composition of Al2O3, Fe2O3, TiO2, and Ga2O3 between unheated and heated samples. The alteration of blue color and the UV-Vis absorption spectra are also difficult to classify. When comparing the samples at each heating temperature, the alteration of blue color was not related to one another because the color of the samples was decreased depending on those of the unheated ones. The FT-IR spectra revealed that the broad absorption peak of O-Al-O bending at approximately 650 cm−1 was slightly shifted to a lower wavenumber (630 – 635 cm−1) after the samples were heated at higher temperatures. The broad absorption peak also turned into a sharper one when the sample has undergone heating at ≥1000 °C. It is suggested that the peak is related to the rearrangement of the Al2O3 structure of the blue sapphire sample after heat treatment.

scholarly journals Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

2020 ◽  
Author(s):  
Zhilei Wei ◽  
Kang Li ◽  
Bangzhi Ge ◽  
Chaowei Guo ◽  
Hongyan Xia ◽  
...  
Keyword(s):  
Particle Size ◽  
Combustion Temperature ◽  
High Efficiency ◽  
Raw Materials ◽  
Low Cost ◽  
Synthesis Method ◽  
Preparation Methods ◽  
Average Size ◽  
Micrometer Size

Abstract Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 μm were successfully synthesized via an in-situ combustion synthesis method. The effect of N 2 pressure, NH 4 Cl content and Al particle size on the combustion reaction procedure, phase composition and microstructure of the products was systematically investigated. The results showed that the decreased N 2 pressure, increased NH 4 Cl content and Al particle size led to the decreasing of combustion temperature and speed, which further affected the morphology of the products. As a result, low N 2 pressure (0.2 MPa), a small amount of NH 4 Cl (0.5 wt%) and fine Al particles (~2.5 μm) contributed to a moderate combustion temperature and facilitated the formation of nearly spherical AlN particles. In addition, based on the gas-releasing assisted quenching experiments and thermo-kinetic analysis, a two-step growth mechanism for the nearly spherical AlN particles was rationally proposed. The present method shows the advantages of low cost and high efficiency for preparing nearly spherical AlN particles, which can be used as raw materials for electronic substrates and fillers for packaging materials.

scholarly journals A Salt-Assisted Combustion Method to Prepare Well-Dispersed Octahedral MnCr2O4Spinel Nanocrystals

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Yuping Tong ◽  
Juntao Ma ◽  
Shunbo Zhao ◽  
Hongyuan Huo ◽  
Hailong Zhang
Keyword(s):  
Electron Microscopy ◽  
Raw Materials ◽  
Combustion Process ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Transmission Electron ◽  
Ft Ir ◽  
Average Size ◽  
Octahedral Nanocrystals

Well-dispersed nanocrystalline MnCr2O4was prepared by a salt-assisted combustion process using low-toxic glycine as fuel and Mn(NO3)2and Cr(NO3)3·9H2O as raw materials. The obtained products were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared (FT-IR) spectroscopy, Raman spectroscopy, Transmission Electron Microscopy (TEM), and Scanning Electron Microscopy (SEM). The fabrication process was monitored by thermogravimetric and differential thermal analysis (TG-DTA). The phase formation process was detected by XRD, and MnCr2O4single phase with high crystallinity was formed at 700°C. TEM and SEM images revealed that the products were composed of well-dispersed octahedral nanocrystals with an average size of 80 nm. Inert salt-LiCl played an important role in breaking the network structure of agglomerated nanocrystallites.

Rapid Synthesis of Eu2Zr2O7 Nanocrystals via Salt-Assistant Combustion Method

2009 ◽  
Vol 79-82 ◽  
pp. 405-408
Author(s):  
Yu Ping Tong ◽  
Chang Yong Li ◽  
Shun Bo Zhao
Keyword(s):  
Low Cost ◽  
Three Dimensional ◽  
Combustion Method ◽  
Treatment Temperature ◽  
Fluorescent Properties ◽  
Solution Combustion ◽  
Excitation Spectra ◽  
Transmission Electron ◽  
Average Size ◽  
20 Nm

Eu2Zr2O7 nanocrystals with cubic structure were successfully synthesized by salt-assistant combustion method. The Eu2Zr2O7 nanocrystals were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Emission/ excitation spectra. The effect of thermal treatment temperature on the crystal size of nanocrystals was studied. The results indicated that Eu2Zr2O7 nanocrystals obtained by this method were well-dispersed and uniform in particle size distribution with average size of 20 nm. By comparison, it was found that the introduction of KCl in the solution combustion reaction process can effectively prevent nanocrystallites from sintering and forming inseparable three-dimensional network, and result in the formation of well-dispersed nanoparticles. The method provides a convenient, low-cost and nontoxic route for the synthesis of nanostructures of oxide materials. Moreover, the strong fluorescent property of the Eu2Zr2O7 nanocrystals obtained by salt-assistant combustion method at 385 nm upon excitation was measured at room temperature. The results showed that Eu2Zr2O7 nanocrystals obtained by salt-assistant combustion method put up excellent fluorescent properties.

scholarly journals Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

2020 ◽  
Author(s):  
Zhilei Wei ◽  
Kang Li ◽  
Bangzhi Ge ◽  
Chaowei Guo ◽  
Hongyan Xia ◽  
...  
Keyword(s):  
Particle Size ◽  
Combustion Temperature ◽  
High Efficiency ◽  
Raw Materials ◽  
Low Cost ◽  
Synthesis Method ◽  
Preparation Methods ◽  
Average Size ◽  
Micrometer Size

Abstract Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 µm were successfully synthesized via an in-situ combustion synthesis method. The effect of N2 pressure, NH4Cl content and Al particle size on the combustion reaction procedure, phase composition and microstructure of the products was systematically investigated. The results showed that the decreased N2 pressure, increased NH4Cl content and Al particle size led to the decreasing of combustion temperature and speed, which further affected the morphology of the products. As a result, low N2 pressure (0.2 MPa), a small amount of NH4Cl (0.5 wt%) and fine Al particles (~ 2.5 µm) contributed to a moderate combustion temperature and facilitated the formation of nearly spherical AlN particles. In addition, based on the gas-releasing assisted quenching experiments and thermo-kinetic analysis, a two-step growth mechanism for the nearly spherical AlN particles was rationally proposed. The present method shows the advantages of low cost and high efficiency for preparing nearly spherical AlN particles, which can be used as raw materials for electronic substrates and fillers for packaging materials.

Bamboo Waste-based Bio-composite Substance: An application for Low-cost Construction Materials

2020 ◽  
Vol 4 (1) ◽  
pp. 41-48
Author(s):  
Teodoro Astorga Amatosa ◽  
Michael E. Loretero
Keyword(s):  
Composite Materials ◽  
Sea Water ◽  
Raw Materials ◽  
Low Cost ◽  
Construction Materials ◽  
Single Layer ◽  
High Strength ◽  
Green Technology ◽  
Experimental Medium ◽  
Natural Treatment

Bamboo is a lightweight and high-strength raw materials that encouraged researchers to investigate and explore, especially in the field of biocomposite and declared as one of the green-technology on the environment as fully accountable as eco-products. This research was to assess the technical feasibility of making single-layer experimental Medium-Density Particleboard panels from the bamboo waste of a three-year-old (Dendrocalamus asper). Waste materials were performed to produce composite materials using epoxy resin (C21H25C105) from a natural treatment by soaking with an average of pH 7.6 level of sea-water. Three different types of MDP produced, i.e., bamboo waste strip MDP (SMDP), bamboo waste chips MDP (CMDP) and bamboo waste mixed strip-chips MDP (MMDP) by following the same process. The experimental panels tested for their physical-mechanical properties according to the procedures defined by ASTM D1037-12. Conclusively, even the present study shows properties of MDP with higher and comparable to other composite materials; further research must be given better attention as potential substitute to be used as hardwood materials, especially in the production, design, and construction usage.

Low-Cost Raw Materials Synthesized Na 2.9375PS 3.9375Cl 0.0625 Solid Electrolyte

2019 ◽  
Author(s):  
Yu Wang ◽  
Nachuan Yang ◽  
Yi Shuai ◽  
Yunpeng Zhang ◽  
Kanghua Chen
Keyword(s):  
Solid Electrolyte ◽  
Raw Materials ◽  
Low Cost
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