نتایج جستجو برای: gel auto combustion
تعداد نتایج: 162150 فیلتر نتایج به سال:
The aim of this study was to investigate the synthesis of calcium aluminate cement with and without phosphate additive by combustion synthesis. After preparing the gel from a solution containing aluminum and calcium nitrates and glycine fuel and ammonium dihydrogen Phosphate, its combustion was performed at 400 ° C. X-ray diffraction pattern and thermal analysis of the combustion sample showed...
In this research CoxMn1-xFe2O4 nano particles (0 ≤ x≤ 0.7), using high purity metal nitrates and citric acid have been prepared by sol gel auto combustion method. The obtained powders were characterized by XRD, FT – IR, SEM and VSM analysis. The XRD patterns showed that the formed crystallites were all in the cubic single phase and the formed crystallite belongs to the space group Fd3m and aver...
Highly sinterable alumina nano-powders have been synthesized by a sol-gel combustion method with glycine asfuel. The preparation involved the thermal decomposition of a chelating agent (fuel)-nitrate gel and theformation of amorphous precursors. The nanopowders calcined at 1100°C were characterized by X-ray powderdiffraction (XRD) and Scanning Electron Microscopy (SEM). It was found that the ch...
In this research, magnesium-zinc ferrite nanoparticles (Mg1-xZnxFe2O4) (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) have been synthesized using sol-gel auto-combustion method. The X-ray diffraction analysis (XRD) revealed that the samples crystallized in a single-phase cubic spinel structure. Crystallites size of samples varies from 13nm to 29nm, also the lattice parameters and bonds length tetrahedral ...
Water gas shift reactions (WGS) were evaluated over Ni/CeO2 and Ni/CeSmO catalysts for hydrogen production. The effects of catalyst preparation method Sm loading investigated. Ni/ceria synthesized by combustion, sol gel gel-combustion method. After WGS tests, the determined carbon deposition thermogravimetric analysis. analysis temperature programmed NH3 desorption showed that addition promoter...
In this work, the potential of auto-ignition of heavy oil during in-situ combustion (ISC) process was studied. Kinetic studies were carried out using Thermo Gravimetric Analyzer (TGA), Differential Scanning Calorimetry (DSC) and Accelerating Rate Calorimetric (ARC) techniques. Effects of oxygen partial pressure, reservoir pressure and clay on auto ignition condition were investigated on a n...
Abstract In response of swift heavy ion (100 MeV I 9+ ) irradiation, the irradiation‐induced disordering in nonstoichiometric pyrochlore composition (Nd 1.8 Zr 2.2 O 7.1 was compared to that stoichiometric Nd 2 7 . Both compositions were prepared through auto gel‐combustion followed by sintering under identical conditions. Systematic analysis before and after irradiation performed with X‐ray di...
The effect of non-magnetic oxides such as Al2O3, TiO2 and ZnO on the microwave absorption properties magnetoplumbite barium hexaferrite (BaFe11.8Co0.2O19) is analyzed. Barium nanoparticles are synthesized through sol-gel auto-combustion method. BaFe11.8Co0.2O19-Al2O3, BaFe11.8Co0.2O19-TiO2 BaFe11.8Co0.2O19-ZnO composites in a 1:1 ratio mechanical mixing heat treatment. epoxy fabricated with 50%...
The color-tunable GdCaAl 3 O 7 : RE 3+ (RE = Eu, Tb, Eu@Tb) phosphors were synthesized via an ultrafast sol-gel auto-combustion synthesis method. X-ray diffraction patterns confirmed the forming of tetragonal phase, and scanning electron microscopy images indicated that obtained products presented honeycomb-like structure due to gas releasing during process. luminescent properties, concentratio...
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