Preparation of Molybdenum Coating on Surface of SiC Particles by Sol-Gel Method

2013 ◽  
Vol 721 ◽  
pp. 224-228
Author(s):  
Shun Li ◽  
Meng Jian Zhu ◽  
Meng Liu ◽  
Shu Xin Bai
Keyword(s):  
Hydrogen Reduction ◽  
Sol Gel ◽  
Reduction Process ◽  
Ammonium Molybdate ◽  
Raw Material ◽  
Molybdenum Coating ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sic Particles ◽  
Ammonium Molybdate Tetrahydrate

The preparation of molybdenum coating on the SiC particles has been investigated with sol-gel method. The results show that SiC particles with molybdenum coating are gained after two-stage hydrogen reduction process, using ammonium molybdate tetrahydrate as raw material.

scholarly journals The novel and facile preparation of multilayer MoS2 crystals by a chelation-assisted sol–gel method and their electrochemical performance

RSC Advances ◽  
2017 ◽  
Vol 7 (15) ◽  
pp. 9009-9014 ◽  
Author(s):  
Xingzhong Guo ◽  
Zichen Wang ◽  
Wenjun Zhu ◽  
Hui Yang
Keyword(s):  
Electrochemical Performance ◽  
Molybdenum Disulfide ◽  
Sol Gel ◽  
Ammonium Molybdate ◽  
The Novel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Facile Preparation ◽  
Ammonium Molybdate Tetrahydrate ◽  
Diethylenetriamine Pentaacetic Acid

Multilayer molybdenum disulfide was prepared by a chelation-assisted sol–gel method with ammonium molybdate tetrahydrate, thioacetamide and diethylenetriamine pentaacetic acid (Dtpa), followed by calcination.

The Research on ODS Iron Powder by Sol-Gel Method

2012 ◽  
Vol 476-478 ◽  
pp. 1146-1149 ◽  
Author(s):  
Xiao Yu ◽  
Zhi Meng Guo ◽  
Jun Jie Hao ◽  
Wei Wei Yang
Keyword(s):  
Mechanical Alloying ◽  
Iron Powder ◽  
Ferritic Steel ◽  
Ph Value ◽  
Sol Gel ◽  
Oxide Dispersion Strengthened ◽  
Steel Powder ◽  
Raw Material ◽  
Gel Method ◽  
Sol Gel Method

Oxide dispersion strengthened (ODS) ferritic steel which contains Y2O3 dispersion is one of the most promising candidates for fast neutron reactor cladding materials due to its excellent swelling resistance to neutron and superior creep resistance in high temperature. There are many ways to prepare ODS ferritic steel and the most commonly used method is mechanical alloying. However, ODS ferritic steel produced by the method of mechanical alloying is poor in the plasticity and impact property. Moreover, the anisotropies of structure and properties are obvious in the follow-up processing. In this paper, in order to reduce the cost, iron powder is used as raw material instead of ferritic steel powder. The complexing sol-gel method is adopted to prepare ODS iron-powder. There are many advantages of the sol-gel method such as the small size of disperse phase and the high uniformity. Besides, it is easy to control the conditions of reaction such as the water content, the bath temperature and the PH value. The gel-coated iron powder can be prepared under the appropriate environmental conditions. Then, we can obtain iron powder with Y2O3 dispersion after heating and reducing the gel-coated iron powder. By the spark plasma sintering(SPS), the ODS iron powder can be densified and we can observe the microstructure and test the performance. The results reveal the Y2O3 dispersion of ODS iron-powder by sol-gel method is uniform and the mechanical property is excellent.

Synthesis and magnetic properties of Fe/SiO2 nanocomposites prepared by a sol–gel method combined with hydrogen reduction

2006 ◽  
Vol 419 (1-2) ◽  
pp. 145-148 ◽  
Author(s):  
N.J. Tang ◽  
H.Y. Jiang ◽  
W. Zhong ◽  
X.L. Wu ◽  
W.Q. Zou ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Hydrogen Reduction ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sio2 Nanocomposites

Study on Properties of Organic Modified SiO2 Glass Prepared by Sol-Gel Method

2011 ◽  
Vol 306-307 ◽  
pp. 865-868 ◽  
Author(s):  
Yun Long Deng ◽  
Yun Hui Sun ◽  
Du Xia Cao
Keyword(s):  
Nitric Acid ◽  
Sol Gel ◽  
Raw Material ◽  
Gel Method ◽  
Sol Gel Method

Organic modified sol-gel glass with tetraethylorthosilicate (TEOS), methyl triethoxysilane (MTEOS) and vinyltriethoxysilane (VTEOS) as raw material, ethanol as solvent and nitric acid as catalytic agent have been prepared. The influence caused by the amount of catalytic agent, water and the ratio of TEOS/MTEOS or TEOS/VTEOS on properties of porosity has been investigated. The optimal ration of MHNO3/MTEOS and Mwater/MTEOS were obtained. The modification of sol-gel glass using organic groups results in some decrease of porosity.

scholarly journals Preparation, Characterization, and Enhanced Photocatalytic Hydrogen Evolution Activity ofY2Cu2O5-Based Compounds under Simulated Sunlight Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Li Zhang ◽  
Jianhui Yan ◽  
Minjie Zhou ◽  
Younian Liu
Keyword(s):  
Hydrogen Reduction ◽  
Diffuse Reflectance Spectroscopy ◽  
Solid Phase ◽  
Sol Gel ◽  
Oxalic Acid Solution ◽  
Phase Method ◽  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Gel Method ◽  
Sol Gel Method

Y2Cu2O5photocatalyst was successfully prepared via solid state reaction and further combined with TiO2by a sol-gel method and a solid phase method, respectively. For comparison, Pt particles were loaded to prepare Pt-Y2Cu2O5via a hydrogen reduction method. All the samples were characterized by thermogravimetry and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and scanning electron microscopy (SEM) techniques. Photocatalytic H2evolution activities of the as-obtained samples were evaluated from aqueous oxalic acid solution under simulated sunlight irradiation. The effects of photocatalyst concentration, TiO2content, and composite method on the H2evolution activities of the as-obtained photocatalysts were investigated. The results show that, when the concentration of photocatalyst is 0.8 g L−1, the TiO2-Y2Cu2O5composite photocatalyst prepared by a sol-gel method exhibits the optimized photocatalytic activity, and the H2production rate is 4.35 mmol h−1g−1with 30 wt.% content of TiO2.

Synthesis of Sm–Co nanoparticles by sol–gel method

2018 ◽  
Vol 32 (34n36) ◽  
pp. 1840069 ◽  
Author(s):  
Wei Wu ◽  
Jinshan Zhang ◽  
Pengjun Cao ◽  
Jiling Dong ◽  
Hao Ding
Keyword(s):  
Sol Gel ◽  
Reduction Process ◽  
Treatment Temperature ◽  
Complexing Agents ◽  
Microstructural Investigation ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir ◽  
Co Nanoparticles ◽  
Reductive Annealing

Sm–Co nanoparticles have promising applications in both scientific and industrial fields. In this paper, Sm–Co single-crystal nanoparticles were prepared using respective metal salts and complexing agents, such as citric acid by Pechini-type sol–gel method. The mixture solution was heated to form a highly viscous gel, and then heated at different temperatures to achieve SmCo-oxide. And then Sm–Co particles were yielded by reductive annealing of the precursors. Phase analysis, microstructural investigation and magnetic properties were performed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), Fourier transform infrared (FT-IR) and VSM. TGA trace analysis of the gel determined the heat treatment temperature. XRD results showed that SmCoO3 and Co3O4 were obtained at 800[Formula: see text]C, FT-IR spectrometry analysis also verified the results. In the calcium-thermal reduction process, Sm2O3 and Co were obtained after reductive annealing at 800[Formula: see text]C, meanwhile Sm–Co nanoparticles were formed at 850[Formula: see text]C. FESEM analysis revealed that the Sm–Co nanoparticles were composed in the form of spherical granules and exhibited well distribution with size in the range of 100 nm. The room temperature saturation magnetization and coercivity of the Sm–Co nanoparticles were 49.61 emu/g and 3.53 kOe, respectively.

Metal nanotubes prepared by a sol–gel method followed by a hydrogen reduction procedure

2006 ◽  
Vol 17 (20) ◽  
pp. 5106-5110 ◽  
Author(s):  
Zhenghe Hua ◽  
Shaoguang Yang ◽  
Hongbo Huang ◽  
Liya Lv ◽  
Mu Lu ◽  
...  
Keyword(s):  
Hydrogen Reduction ◽  
Sol Gel ◽  
Reduction Procedure ◽  
Gel Method ◽  
Sol Gel Method ◽  
Metal Nanotubes

Preparation of Al2O3-SiO2 Composite Powder by Sol–Gel Method

2014 ◽  
Vol 1053 ◽  
pp. 173-176
Author(s):  
Chun Xiao Zhu ◽  
Shao Feng Zhu
Keyword(s):  
Specific Surface ◽  
Amorphous Silica ◽  
Composite Powder ◽  
Sol Gel ◽  
Raw Material ◽  
Molar Ratio ◽  
Homogeneous Distribution ◽  
Small Particle Size ◽  
Gel Method ◽  
Sol Gel Method

Al2O3-SiO2 composite powder was prepared by sol-gel method, using TEOS and AlNO3 as the main raw material .XRD, SEM and the specific surface analyzer were used to characterize the powder. The results showed that powder obtained by calcining xerogel of the molar ratio of SiO2/Al2O3=1:1.5 at 1200°C had high crystallinity and purity , homogeneous distribution and small particle size that was 100-200nm. Its specific surface area decreased with the increase of the calcining temperature. The main phase of xerogel was amorphous silica. After xerogel was calcined at 400°C, 600°C and 800°C respectively, the phase of obtained powder was also amorphous silica. But at 1000°C and 1100°C respectively, small amounts of Al-Si spinel were produced. At 1200°C, the powder was all mullite and Al-Si spinel did not exist completely.

Synthesis with Microwave-Assisted Sol-Gel Method and Photocatalytic Activity of Quantum-Sized TiO2 under Solar and Ultraviolet Irradiation

2011 ◽  
Vol 399-401 ◽  
pp. 666-672
Author(s):  
Shi Xiang Lu ◽  
Lian Dai ◽  
Wen Guo Xu ◽  
Cheng Xiang Ma
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Degradation Rate ◽  
Sol Gel ◽  
Raw Material ◽  
Solar Irradiation ◽  
Processing Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted

Quantum-sized TiO2 had been prepared by using Ti(n-OC4H9)4 as the raw material via a microwave-assisted sol-gel method. The influence of different processing temperature and time on the size of TiO2 was researched. The TiO2 was characterized by transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). The prepared TiO2 presents anatase phase structure by TEM and XRD. The photocatalytic activity of TiO2 was evaluated by the degradation rate of methyl orange in aqueous solution. The particle size of TiO2 was about 9.10 nm when the processing temperature was 160°C and the processing time was 90 min (160°C-90min), and the photocatalytic performance was the best under this size. When the initial concentration of methyl orange was 10 mg/L and the amount of quantum-sized TiO2 was 0.6 g/L, the degradation rate of methyl orange under ultraviolet and solar irradiation at room temperature in 60 min were 40% and 86%, respectively.

scholarly journals Synthesis of Bioactive Glass Powder Using Sol-Gel Method and Shaping Using Plasma Spark Sintering

2017 ◽  
Vol 14 (4) ◽  
pp. 1523-1531 ◽  
Author(s):  
Mehdi Mohsenpour Tehrani ◽  
Manocher Sobhani
Keyword(s):  
Heat Treatment ◽  
Bioactive Glass ◽  
Glass Powder ◽  
High Pressures ◽  
Sol Gel ◽  
Amorphous Structure ◽  
Raw Material ◽  
Maximum Temperature ◽  
Gel Method ◽  
Sol Gel Method

ABSTRACT: In the present study, the synthesis of bioactive glass powder is carried out using the sol-gel method and in an acidic environment. TEOS (Tetraethyl orthosilicate) is used as the raw material of supplying Silica and TEP (three ethyl phosphates) is used as the raw material for providing phosphate powder compounds. Synthesis is done without water and using pure alcohol solvent 99.99%. After preparation of powder from the gel and drying it, the heat treatment process was performed at 500, 550 and 600 C for 2 hours on the powder. Thus, the bioactive glass powder was prepared for the SPS stage. In the present study due to technological limitations (impossibility of access to the high pressures of the SPS device used), at the formation stage, the maximum force of 20 tons was selected using the SPS device. Experiments performed on the powder include XRD and DTA. The results of this research show that performing heat treatment at a maximum temperature of 550°C with the aim of increasing the maintenance of the amorphous structure of the product is the most ideal temperature for heat treatment. Also, the use of suitable molds in the SPS process with a tolerance of up to 300 MPa is a requirement of the process.

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