scholarly journals Investigation on the thermodynamic analysis, preparation and characterization of LaNi5 - hydrogen storage alloy by magnesiothermic reduction diffusion process

2016 ◽  
Vol 52 (2) ◽  
pp. 171-175 ◽  
Author(s):  
G. Giresan ◽  
S.R. Sankaranarayanan ◽  
L.J. Berchmans
Keyword(s):  
Diffusion Process ◽  
Raw Materials ◽  
Reduction Process ◽  
Feasibility Studies ◽  
Thermal Reduction ◽  
Decomposition Temperature ◽  
Metal Powders ◽  
Metallothermic Reduction ◽  
Lani5 Alloy ◽  
Probabilistic Nature

The present investigation focuses on the preparation of LaNi5 intermetallic compound by ?Metallothermic reduction diffusion process?. Experiments were carried out using oxides and chlorides of La and Ni metal powders as the raw materials with granular Mg powder as the reductant. The thermal reduction process was carried out at 900 ?C for 9 hrs in Ar atmosphere. After the completion of reaction, the contents were purified by treating with dilute acetic acid followed by de-ionized water. Thermodynamic feasibility studies were carried out to determine the probabilistic nature of formation of the desired compound. Thermal analysis was carried out to find the dissociation and decomposition temperature of the reactants. The phase purity and the elemental composition of the alloy were assessed by XRD and EDX analyses. The morphological features of the prepared powders were examined by SEM. From this study, it has been concluded that LaNi5 alloy can be prepared with an appreciable purity by the Metallothermic reduction diffusion process.

Metallothermic Reduction at Low Temperature Synthesis of Ti4O7 Powder with Lithium Ion Insertion/Extraction Property

2019 ◽  
Vol 956 ◽  
pp. 55-66
Author(s):  
Bei Lei Yan ◽  
Wei Wei Meng ◽  
San Chao Zhao
Keyword(s):  
Reduction Method ◽  
Average Particle Size ◽  
Active Material ◽  
Reduction Process ◽  
Lithium Ion ◽  
Thermal Reduction ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Metallothermic Reduction ◽  
Extraction Property

In this work, a thermal reduction process via ultrafine titanium powder as the reducing agent under argon atmosphere is firstly used to prepare Ti4O7. Compared with the conventional method, this experiment process reduces the sintering temperature to 850°C. The phase transformation and the morphology of the as-prepared powders are examined by X-Ray diffraction (XRD) and scanning electron microscopy (SEM). Besides, it is found that the Ti4O7 powders obtained by titanium thermal reduction method exhibited the crystal structure, distinctly possessing an average particle size around 750 nm. The as-prepared Ti4O7 nanoparticles are used as anode active material in lithium battery. The results demonstrate that the anode with Ti4O7 calcined at 850°C by titanium thermal reduction method exhibited insertion/extraction lithium ion property.

scholarly journals Highly Sensitive Hybrid Nanostructures for Dimethyl Methyl Phosphonate Detection

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 648
Author(s):  
Sanjeeb Lama ◽  
Jinuk Kim ◽  
Sivalingam Ramesh ◽  
Young-Jun Lee ◽  
Jihyun Kim ◽  
...  
Keyword(s):  
Chemical Warfare Agents ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Hybrid Nanostructures ◽  
Nitrogen Doped ◽  
Saw Sensor ◽  
Quartz Crystal Microbalance Sensor ◽  
Warfare Agents ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Nanostructured materials synthesized by the hydrothermal and thermal reduction process were tested to detect the dimethyl methylphosphonate (DMMP) as a simulant for chemical warfare agents. Manganese oxide nitrogen-doped graphene oxide with polypyrrole (MnO2@NGO/PPy) exhibited the sensitivity of 51 Hz for 25 ppm of DMMP and showed the selectivity of 1.26 Hz/ppm. Nitrogen-doped multi-walled carbon nanotube (N-MWCNT) demonstrated good linearity with a correlation coefficient of 0.997. A comparison between a surface acoustic wave and quartz crystal microbalance sensor exhibited more than 100-times higher sensitivity of SAW sensor than QCM sensor.

scholarly journals Insights into thermal reduction of the oxidized graphite from the electro-oxidation processing of nuclear graphite matrix

RSC Advances ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 567-579 ◽  
Author(s):  
Gengyu Zhang ◽  
Mingfen Wen ◽  
Shuwei Wang ◽  
Jing Chen ◽  
Jianchen Wang
Keyword(s):  
Temperature Dependence ◽  
Structural Transformation ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Oxygen Species ◽  
Nuclear Graphite ◽  
Graphite Matrix ◽  
Electro Oxidation ◽  
Oxidized Graphite

Temperature-dependence of structural transformation of oxidized graphite from the electro-oxidation processing of nuclear graphite matrix have been studied. Meanwhile, the mechanism of dissociation of oxygen species on the thermal reduction process has been suggested.

scholarly journals Facile preparation and excellent microwave absorption properties of an RGO/Co0.33Ni0.67 lightweight absorber

RSC Advances ◽  
2017 ◽  
Vol 7 (69) ◽  
pp. 43831-43838 ◽  
Author(s):  
Hai Pan ◽  
Mingzhen Xu ◽  
Qing Qi ◽  
Xiaobo Liu
Keyword(s):  
Microwave Absorption ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Thermal Method ◽  
Absorption Properties ◽  
One Pot ◽  
Microwave Absorption Properties ◽  
Facile Preparation

A lightweight absorber with an ordered sandwich-like structure was fabricated using a simple one-pot solvent-thermal method and thermal reduction process.

scholarly journals Structures and Properties of Self - crosslinking Silicone Resin

2018 ◽  
Vol 38 ◽  
pp. 02019
Author(s):  
Yong-xin Zhao ◽  
Ying-qiang Zhang
Keyword(s):  
Thermal Decomposition ◽  
Raw Materials ◽  
Decomposition Temperature ◽  
Light Transmittance ◽  
Silicone Resin ◽  
Structures And Properties ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Good Heat Resistance ◽  
Good Heat

Highly transparent silicone resin with self-crosslinking structure was prepared using phenyltrimethoxysilane, diphenyldimethoxysilane, 1,3,5,7-cyclotetra(methyl siloxane) and bisvinyltetramethyldisiloxane as main raw materials. The structure of silicone resin was determined by Fourier Transform Infrared Spectroscopy (FT-IR). The light transmittance was measured by UV-Vis spectroscopy. Thermogravimetric analysis (TGA) was used to study the thermal decomposition process. The microstructure of cured self-crosslinking silicone resin is more uniform, resulting in better light transmittance up to 100% in the range of 400nm ~ 800nm. The cured has relatively good heat resistance, the initial thermal decomposition temperature of the cured could be up to 315.8 °C. SEM observations show that the self-crosslinking silicone has a uniform, textured structure, higher transparency compared with the existing condensation silicone material, and can be used as advanced architectural translucent materials and optics packaging materials.

On the carbo-thermal reduction of silica for carbon nano-fibre formation via CVD

2011 ◽  
Vol 1284 ◽  
Author(s):  
Alicja Bachmatiuk ◽  
Felix Börrnert ◽  
Imad Ibrahim ◽  
Bernd Büchner ◽  
Mark H. Rümmeli
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Carbothermal Reduction ◽  
Carbon Nanostructures ◽  
Reduction Process ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Thermal Reduction ◽  
Fibre Formation ◽  
Quartz Substrates

ABSTRACTThe formation of carbon nanostructures using silica nanoparticles from quartz substrates as a catalyst in an aerosol assisted chemical vapor deposition process was examined. The silica particles are reduced to silicon carbide via a carbothermal reduction process. The recyclability of the explored quartz substrates is also presented. The addition of triethyl borate improves the efficiency of the carbothermal reduction process and carbon nanotubes formation. Moreover, the addition of hydrogen during the chemical vapor deposition leads to the helical carbon nanostructures formation.

Growth of Ag Nanoparticles by Spin Coating

2013 ◽  
Vol 24 ◽  
pp. 163-167 ◽  
Author(s):  
S.D. Sartale ◽  
A.A. Ansari
Keyword(s):  
Ag Nanoparticles ◽  
Spin Coating ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Thermal Reduction ◽  
Environment Effects ◽  
Uv Visible ◽  
Absorbance Spectra ◽  
Scanning Electron ◽  
Better Than

Ag nanoparticles were grown on glass substrate by spin coating of Ag ions (AgNO3) solution followed by either chemical reduction, in aqueous hydrazine or NaBH4 solution, or by thermal reduction in H2 environment. Effects of different reducing agent have been explained. Morphology and absorbance spectra ofAg nanoparticles films, measured by using Scanning Electron Microscopy (SEM) and UV-visible Spectrophotometer techniques, are used to understand effect of reduction process on growth of Ag nanoparticles. To grow uniformly size distributed Ag nanoparticles thermal reduction in H2 is better than chemical reduction by aqueous either NaBH4 orhydrazine hydrate solutions.

scholarly journals Synthesis of 3D-porous scaffold from cockle shells waste-based hydroxyapatite with addition silica from tin tailings

2021 ◽  
Vol 926 (1) ◽  
pp. 012044
Author(s):  
F Afriani ◽  
J Evi. ◽  
R A Rafsanjani ◽  
R Amelia ◽  
M Hudatwi ◽  
...  
Keyword(s):  
Diffraction Pattern ◽  
Goodness Of Fit ◽  
Porous Scaffold ◽  
Raw Materials ◽  
Synthesis Method ◽  
Decomposition Temperature ◽  
Porous Scaffolds ◽  
Xrd Pattern ◽  
Replication Method ◽  
Tailings Sand

Abstract This study aims to synthesize a porous scaffold based on hydroxyapatite and silica using the polymer sponge replication method. In bone tissue engineering technology, the development of porous scaffolds is a topic that is intensively studied because it is expected to be a solution to various problems of conventional bone therapy. In addition to proposing a porous scaffold synthesis method, we also utilize natural waste-based materials such as cockle shells and tin tailings as raw materials in this research. Investigation through x-ray diffraction (XRD) pattern with the goodness of fit coefficient, X 2 = 0.09 shows that the coprecipitation method is effective for the synthesis of hydroxyapatite. Analysis of XRD pattern of tin tailings sand with a value of X 2 = 0.008 showed that the diffraction pattern was related to silica with space group P 41 21 2. The polymer sponge replication method with polyurethane template succeeded in obtaining scaffolds with macropores above 300 μm. Based on the diffraction pattern of the three porous scaffolds prepared with different percentages of HA, it is known that all porous scaffolds have peaks related to HA and silica. It indicates that the decomposition temperature of polymer does not provide sufficient energy for the HA and silica to transform or react chemically.

scholarly journals SEQUENTIAL EXTRACTION PROCEDURE: A VERSATILE TOOL FOR ENVIRONMENTAL RESEARCH

Detritus ◽  
2020 ◽  
pp. 23-28
Author(s):  
Maria Villen-Guzman ◽  
Maria del Mar Cerrillo-Gonzalez ◽  
Juan Manuel Paz-Garcia ◽  
Carlos Vereda-Alonso ◽  
Cesar Gomez-Lahoz ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Raw Materials ◽  
Extraction Procedure ◽  
Feasibility Studies ◽  
Economic Feasibility ◽  
Sequential Extraction Procedure ◽  
Environmental Research ◽  
Solid Matrix ◽  
Secondary Source ◽  
Versatile Tool

The sequential extraction procedure as a tool to assess the environmental risk of metals in solid matrices has been widely studied. In this work, another promising application of these methods is proposed: the evaluation of the recoverability of critical raw materials from a solid matrix. To this aim, the normalized sequential extraction procedure BCR was applied to a contaminated soil from the south of Spain. In addition to this, the influence of the incomplete dissolution of carbonates contained in the soil on the fractionation results has been also studied. The high percentage of metal in the most mobile fractions suggested the potential use of the solid matrix as secondary source. The use of this approach together with environmental and economic feasibility studies would be an approach toward the circular economy.

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