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.

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.

Antibacterial and photocatalytic activities of controllable (anatase/rutile) mixed phase TiO2 nanophotocatalysts synthesized via a microwave-assisted sol–gel method

2020 ◽  
Vol 44 (2) ◽  
pp. 562-570 ◽  
Author(s):  
Karima Almashhori ◽  
Tarek T. Ali ◽  
Abdu Saeed ◽  
Reem Alwafi ◽  
Magda Aly ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Sol Gel ◽  
Single Source ◽  
Constant Concentration ◽  
Structure Directing Agent ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted ◽  
Single Source Precursor ◽  
Photocatalytic Activities

TiO2 with different ratios of anatase/rutile phases were synthesized via a microwave assisted sol–gel method and by applying a single source precursor (SSP) with a constant concentration of nitric acid that was used as the structure directing agent.

scholarly journals Nitrogen doping into titanium dioxide by the sol–gel method using nitric acid

2011 ◽  
Vol 37 (8) ◽  
pp. 869-881 ◽  
Author(s):  
Hiromasa Nishikiori ◽  
Yosuke Fukasawa ◽  
Yuta Yokosuka ◽  
Tsuneo Fujii
Keyword(s):  
Titanium Dioxide ◽  
Nitric Acid ◽  
Nitrogen Doping ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

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.

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.

Three-dimensionally ordered macroporous LaMnO3 with tunable oxygen vacancies via nitric acid-aided modulating and their catalytic combustion properties

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 98404-98411 ◽  
Author(s):  
Renchun Yang ◽  
Xiaojia Lu ◽  
Zhihua Zhang ◽  
Xiuxiang Wang ◽  
Dingxing Tang ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Catalytic Combustion ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Combustion Properties ◽  
Ordered Macroporous

Three-dimensionally ordered macroporous (3DOM) LaMnO3 oxides with tunable oxygen vacancies have been successfully fabricated via a facile nitric acid-aided modulating sol–gel method.

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.

scholarly journals The Effect of Acidity and Aging Time in The Synthesis of Al(OH)3 from The Anodized-waste with a Sol-Gel Method

2019 ◽  
Vol 8 (3) ◽  
pp. 232-238
Author(s):  
Sri Wardhani ◽  
◽  
Danar Purwonugroho ◽  
Deka Permatasari ◽  
Darjito Darjito ◽  
...  
Keyword(s):  
Particle Size ◽  
Aging Time ◽  
Ph Value ◽  
Sol Gel ◽  
Powder Xrd ◽  
Raw Material ◽  
Gel Method ◽  
Sol Gel Method ◽  
D Values ◽  
Particle Size Characterization

Synthesis of alumina has been carried out by utilizing anodized waste as raw material. Anodized waste is a by-product of metal anodizing processes such as aluminium. This study aims to determine the effect of acidity (pH) and aging time on the mass of Al(OH)3 and the property of Al(OH)3 as well as Al2O3 that produced. Anodized waste was deposited into Al(OH)3 and then purified. Alumina synthesized by the sol-gel method with pH variations of 7, 8, 9, and 10 and aging times of 24, 48, and 72 hours. The Al(OH)3, which has been produced, was characterized by PSA and powder XRD spectrophotometer. The results showed that the synthesis of Al(OH)3 was influenced by pH and aging time. It affects the yield and particle size of Al(OH)3. The optimum condition of the synthesis was pH 7 and aging time of 24 hours with yield of 1.85 grams. Characterization by PSA at a current diameter of 90% indicate that higher pH value and longer aging time produces smaller particle size. Characterization by powder XRD shows that the Al(OH)3 has gibbsite crystal phase with d values of 3.360, 3.217, 2.252, 2.029, and 1.649 Å.

Sign in / Sign up

Export Citation Format

Share Document