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 Three-Dimensional Mesoporous Ni-CeO2 Catalysts with Ni Embedded in the Pore Walls for CO2 Methanation

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 523 ◽  
Author(s):  
Luhui Wang ◽  
Junang Hu ◽  
Hui Liu ◽  
Qinhong Wei ◽  
Dandan Gong ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Nitrogen Adsorption ◽  
Combustion Method ◽  
Catalytic Performance ◽  
Oxide Interface ◽  
Solution Combustion ◽  
Co2 Methanation ◽  
Transmission Electron ◽  
Temperature Programmed ◽  
Adsorption Desorption

Mesoporous Ni-based catalysts with Ni confined in nanochannels are widely used in CO2 methanation. However, when Ni loadings are high, the nanochannels are easily blocked by nickel particles, which reduces the catalytic performance. In this work, three-dimensional mesoporous Ni-CeO2-CSC catalysts with high Ni loadings (20−80 wt %) were prepared using a colloidal solution combustion method, and characterized by nitrogen adsorption–desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM) and H2 temperature programmed reduction (H2-TPR). Among the catalysts with different Ni loadings, the 50% Ni-CeO2-CSC with 50 wt % Ni loading exhibited the best catalytic performance in CO2 methanation. Furthermore, the 50% Ni-CeO2-CSC catalyst was stable for 50 h at 300° and 350 °C in CO2 methanation. The characterization results illustrate that the 50% Ni-CeO2-CSC catalyst has Ni particles smaller than 5 nm embedded in the pore walls, and the Ni particles interact with CeO2. On the contrary, the 50% Ni-CeO2-CP catalyst, prepared using the traditional coprecipitation method, is less active and selective for CO2 methanation due to the larger size of the Ni and CeO2 particles. The special three-dimensional mesoporous embedded structure in the 50% Ni-CeO2-CSC can provide more metal–oxide interface and stabilize small Ni particles in pore walls, which makes the catalyst more active and stable in CO2 methanation.

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.

A Convenient Method for Preparing Well-Dispersed Er2Zr2O7 Nanocrystals

2010 ◽  
Vol 123-125 ◽  
pp. 611-614 ◽  
Author(s):  
Yu Ping Tong ◽  
Rui Zhu Zhang ◽  
Shun Bo Zhao ◽  
Chang Yong Li
Keyword(s):  
Particle Size ◽  
Combustion Synthesis ◽  
Crystal Size ◽  
Lattice Distortion ◽  
Combustion Method ◽  
Treatment Temperature ◽  
Synthesis Process ◽  
Thermal Treatment Temperature ◽  
Average Size ◽  
Xrd And Tem

Well-dispersed fluorite Er2Zr2O7 nanocrystals have been successfully prepared by a convenient salt-assistant combustion method. The effects of calcinations temperature and salt category on the characteristics of the products were investigated by XRD and TEM. The thermal treatment temperature has an important effect on crystal size and lattice distortion of the nanocrystals. The experiment showed that the introduction of salt in the combustion synthesis process resulted in the formation of well-dispersed Er2Zr2O7 nanocrystals. The average size was 30 nm and was in agreement with the XRD result, which indicated that the nanocrystals were uniform in particle size distribution. Moreover, the possible formation process in the salt-assisted combustion synthesis was also analyzed.

Self-Organized Composition Modulation In Omvpe Ga1−xInxAsySb1−y/GaSb Epitaxial Heterostructures

1999 ◽  
Vol 583 ◽  
Author(s):  
Y-C. Chen ◽  
V. Bucklen ◽  
K. Rajan ◽  
C. A. Wang ◽  
G. W. Charache ◽  
...  
Keyword(s):  
Cross Section ◽  
Three Dimensional ◽  
Component Composition ◽  
Organometallic Vapor Phase Epitaxy ◽  
Composition Modulation ◽  
Self Organized ◽  
Transmission Electron ◽  
Epitaxial Heterostructures ◽  
20 Nm ◽  
Lattice Matched

AbstractMicrostructures of lattice-matched Ga1−xInxAsySb1−y grown by organometallic vapor phase epitaxy (OMVPE) on (100) 6°→ (111)B GaSb substrates have been examined in detail by transmission electron microscopy. A three-dimensional self-organized composition modulation (SOCM) microstructure was found with an orientation inclined 10 degrees to the surface orientation when viewed in (011) cross-section. The periodicity of the SOCM increased from ˜13 nm to 20 nm, as x increased from 0.1 to 0.2 while the orientation of the SOCM remained the same. The fact that the orientation was not sensitive to the component composition indicated that substrate misorientation plays a major role in deciding this SOCM orientation. This may open fabrication opportunities for three-dimensional natural superlattices by engineering on the substrate misorientation.

Influence of Fuel and Condition in Combustion Synthesis on Properties of Copper (II) Oxide Nanoparticle

2013 ◽  
Vol 829 ◽  
pp. 152-156 ◽  
Author(s):  
Hamed Sadabadi ◽  
Adeleh Aftabtalab ◽  
Shirzad Zafarian ◽  
Shilpa Chakra ◽  
K. Venkateswara Rao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Oxide Particle ◽  
Combustion Method ◽  
Copper Oxide Nanoparticles ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Edax Analysis ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Oxide Nanoparticle

Copper oxide nanoparticles have been received attraction due to their unique properties and potential future applications. In present work nanostructure Copper (II) oxide (CuO) spherical nanoparticle synthesized by solution combustion method and the influence of different fuel and condition on the properties of CuO particle was investigated. Crystalline phase and size indicated by applying XRD and particle size distribution studied further using DLS. Scanning electron microscopy (SEM) was used for morphological study and EDAX analysis shows composition of CuO particles. Nanostructure of copper (II) oxide particle studied further by Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) applied for detail study on crystalline structure of particles.

A New Method for Preparing Ge Nano-Crystallites Embedded in SiNY Matrices

1994 ◽  
Vol 358 ◽  
Author(s):  
Kunji Chen ◽  
Xuexuan Qu ◽  
Xinfan Huang ◽  
Zhifeng Li ◽  
Duan Feng
Keyword(s):  
Laser Annealing ◽  
Hydrogen Plasma ◽  
New Method ◽  
Transmission Electron ◽  
Scattering Spectra ◽  
Ion Laser ◽  
New Type ◽  
Raman Scattering Spectra ◽  
Average Size ◽  
20 Nm

ABSTRACTWe report a new method for synthesizing Ge nano-crystallites embedded in SiNy film matrices. On the basis of the effect of the reactant precursors and preferential chemical bonding of Si-N and Ge-Ge, thin films with Ge clusters embedded in SiNy matrices have been prepared in the PECVD system with reactant gases of SiH4, GeH4 and NH3 mixed in the hydrogen plasma. The as-deposited films were then crystallized by Ar ion laser annealing or thermal annealing technique to form nanometer-sized Ge crystallites.The composition and microstructures of these new type of sample were characterized by infrared absorption spectra, transmission electron microscopy, X-ray diffraction and Raman scattering spectra. The results indicated that the average size of Ge crystallites was estimated to be 2-20 nm depending on the deposition and annealing parameters and can be controlled by a designed manner.

Microfluidic Synthesis of Lipid-Polymer Hybrid Nanoparticles for Targeted Drug Delivery

MRS Advances ◽  
2016 ◽  
Vol 1 (29) ◽  
pp. 2155-2160
Author(s):  
Eri A. Takami ◽  
Folarin Erogbogbo
Keyword(s):  
Drug Delivery ◽  
Low Cost ◽  
Three Dimensional ◽  
Hybrid Nanoparticles ◽  
Dimensional Structure ◽  
Force Microscopy ◽  
Polymer Hybrid ◽  
Medical Issues ◽  
Transmission Electron ◽  
Size And Morphology

ABSTRACTLipid-polymer hybrid nanoparticles (LPHN) have great potential as drug delivery devices for treatment of serious medical issues such as cardiovascular disease, tuberculosis, and cancer. Nanoprecipitation is a commonly used method to synthesize LPHN in a low cost manner. However, this multi-step process proves to be difficult in consistently producing uniformly sized nanoparticles. Here we developed a microfluidic device that utilizes a three-channel pathway and mixer channel to synthesize uniformly sized LPHN in a controlled manner. Dynamic light scattering results of the microfluidic synthesized nanoparticles show decrease in diameter size from 140 nm to 40 nm as the Reynolds number of the channel inflow increases. Transmission electron microscopy confirms the size and morphology of the nanoparticles. Three dimensional structure of the LPHN were observed using atomic force microscopy. The production of higher quality nanoparticles using our microfluidics device can expedite the research and development process of drug delivering lipid polymer nanoparticles.

Characterization and their Fluorescence of Fe3+-Doped La2Zr2O7 Nanocrystals by a Salt-Assistant Combustion Method

2011 ◽  
Vol 306-307 ◽  
pp. 1257-1261 ◽  
Author(s):  
Yun Shan Bai ◽  
Lu De Lu ◽  
Jian Chun Bao
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solid Solutions ◽  
Low Cost ◽  
Combustion Process ◽  
Combustion Method ◽  
Crystal Form ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
Transmission Electron

Nanocrystalline Fe3+-doped La2Zr2O7 series solid solutions were prepared by a convenient salt-assisted combustion process using glycine as fuel. The samples 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 showed the La ion can be partially replaced by Fe ion. The partial substituted products were still single-phase solid solutions and the crystal form remained unchanged. TEM images reveal that the products are composed of well-dispersed square-shaped nanocrystals. The method provides a convenient and low-cost route for the synthesis of nanostructures of oxide materials. The fluorescence of La1.8Fe0.2Zr2O7 nanocrystals was evaluated by the UV-visible absorption spectra and the fluorescence spectra. The results indicate that (LaxFe1-x)2Zr2O7 nanocrystals prepared by this method are a kind of potential fluorescent-emitted material.

Green Route Synthesis of MgO Nanoparticles Using Murraya Koenigii Leaf Extract: An Efficient Photo Catalyst for Malachite Green

2018 ◽  
Vol 24 (8) ◽  
pp. 5801-5804
Author(s):  
K. N. Shravana Kumara ◽  
H. P Nagaswarupa ◽  
K. R. Vishnu Mahesh ◽  
M Mylarappa ◽  
S. C Prashantha ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Average Particle Size ◽  
Diffraction Method ◽  
Combustion Method ◽  
Average Particle ◽  
Murraya Koenigii ◽  
Solution Combustion ◽  
Efficient Catalyst ◽  
Mgo Nanoparticles ◽  
Average Size

The objective of this work is mainly focused on green synthesis and characterization of MgO nanoparticles by low temperature solution combustion method. The Murraya koenigii (Curry leaves) was used as a reducing agent (as fuel). The average size and crystallinity of nano MgO particles are analyzed by X-ray Diffraction method (PXRD) and accurate morphology was studied using Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). From XRD, shows that average particle size of MgO is 40 nm. The synthesized MgO particles used as an efficient catalyst shows rapid color removal and reduction in the concentration of dyes.

Sintering and Dielectric Properties of Ba(Mg1/3Ta2/3)O3 Particle Prepared by Spray Pyrolysis

2008 ◽  
Vol 388 ◽  
pp. 245-248 ◽  
Author(s):  
Hiroki Yamada ◽  
Takashi Okawa ◽  
Takashi Ogihara
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Nano Particles ◽  
Ultrasonic Spray ◽  
Transmission Electron ◽  
Powder Particles ◽  
Average Size ◽  
Micrometer Size ◽  
20 Nm

Ba(Mg1/3Ta2/3)O3 (BMT) powders were successfully prepared by ultrasonic spray pyrolysis from an aqueous solution of Ba, Mg and Ta. The particles characteristics of BMT nano-sized powders were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). As-prepared powder particles had a sub-micrometer size with a narrow distribution. Transmission electron microscopy (TEM) observation revealed that the average size of the BMT nano-particles was around 20 nm, and that these particles were aggregated. The dielectric constant (r) of 23.2 and the Q・f of 98,300 were obtained at 1550°C by a spray pyrolysis.

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