Structure and properties of BaFe12O19 coated fly ash cenospheres by sol-gel process

2006 ◽  
Vol 21 (3) ◽  
pp. 129-131 ◽  
Author(s):  
Zeng Aixiang ◽  
Xiong Weihao ◽  
Wang Caifang ◽  
Zhou Qionghua
Keyword(s):  
Fly Ash ◽  
Sol Gel ◽  
Structure And Properties ◽  
Sol Gel Process ◽  
Fly Ash Cenospheres

Structure and properties of PZT thick films prepared by a modified sol-gel process

2001 ◽  
Vol 260 (1) ◽  
pp. 231-236 ◽  
Author(s):  
Qifa Zhou ◽  
Qingqi Zhang ◽  
Helen Lai Wah Chan ◽  
Chung Loong Choy
Keyword(s):  
Thick Films ◽  
Sol Gel ◽  
Structure And Properties ◽  
Sol Gel Process

N,Fe Nano-TiO2 Doped on the Fly Ash Forming Absorbent and the Photocatalytic Activity Study

2013 ◽  
Vol 773 ◽  
pp. 912-916
Author(s):  
Yong Mei Liu ◽  
Zhuan Nian Liu ◽  
Xiao Gang Han
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Fly Ash ◽  
Visible Light Irradiation ◽  
Degradation Rate ◽  
Sol Gel ◽  
Visible Region ◽  
Dip Coating ◽  
Structure And Properties ◽  
Dip Coating Technique

nanoTiO2photocatalyst modified by N and Fe3+ion were loaded on fly ash forming adsorbent (FFA) using the sol-gel dip-coating technique. The structure and properties of the samples were characterized by UV-Vis spectrum, SEM and XRD. The related influencing factors were also discussed. The results showed that modified TiO2was immobilized on the surface of FFA in the form of nanocrystalline and an apparent absorption peak appears in the visible region of photocatalyst doped with N,Fe ion. Moreover, under visible light irradiation for 6h, the degradation rate of 50mg/L of methylene blue by loaded catalyst reached 92.6 %.

Structure and Properties of Vanadium Pentoxide Gels

1984 ◽  
Vol 32 ◽  
Author(s):  
J. Livage
Keyword(s):  
Sol Gel ◽  
Host Lattice ◽  
Proton Conductors ◽  
Thin Layers ◽  
Structure And Properties ◽  
Fast Proton ◽  
New Developments ◽  
Semiconducting Properties ◽  
Sol Gel Process ◽  
Polycondensation Process

ABSTRACTTransition metal oxide gels can be obtained, through a polycondensation process, by acidification of aqueous solutions. Thin layers can be easily deposited onto a substrate. Their electronic and ionic properties could lead to new developments of the sol-gel process. The semiconducting properties of V2O gels can be used for antistatic coatings or electrical switching devices. These gels exhibit a lamellar structure and can be described as particle hydrates. They are fast proton conductors and could behave as a host lattice for intercalation.

scholarly journals A Brief Review on the Use of Chelation Agents in Sol-gel Synthesis with Emphasis on β-Diketones and β-Ketoesters

2019 ◽  
Vol 33 (3) ◽  
pp. 295-301 ◽  
Author(s):  
Sanislav Kurajica
Keyword(s):  
Ethyl Acetoacetate ◽  
Sol Gel ◽  
Chelating Agent ◽  
Short Review ◽  
Metal Alkoxides ◽  
Structure And Properties ◽  
Gel Structure ◽  
Sol Gel Process ◽  
Rapid Hydrolysis ◽  
Sol Gel Synthesis

Metal alkoxides are the most commonly used sol-gel process precursors. Most<br /> alkoxides show excessive reactivity towards water. That leads to rapid hydrolysis, metal<br /> hydroxide formation, and immediate precipitation. The reactivity of alkoxides can be<br /> reduced by modification with chelation agents. Chelation influences the gelation process,<br /> which is reflected in gel structure and properties of the final material. In this short review,<br /> the chelation process, the oligomerization phenomena, and the influence of the chelating agent on the gel structure are discussed. Peculiarities of the use of FTIR and NMR, as methods particularly suitable for the investigation of chelation process, are described taking ethyl acetoacetate as an example.

Structure and Properties of Biomorphous Al/C/TiO/TiC Composite Materials Reinforced with Charcoals Coated in ALD and the Sol-Gel Process

2018 ◽  
Vol 275 ◽  
pp. 66-77
Author(s):  
Tomasz Tański ◽  
Łukasz Krzemiński
Keyword(s):  
Composite Materials ◽  
Sol Gel ◽  
Atomic Layer ◽  
Al Alloy ◽  
Structure And Properties ◽  
Infiltration Process ◽  
X Ray ◽  
Layer Deposition ◽  
Sol Gel Process ◽  
Pure Carbon

In this framework, an investigation of biomorphous composite materials was performed. The application of a natural reinforcement allows to obtain biomorphous composite materials. Pine wood samples were subjected to the pyrolysis process in order to obtain carbon char. The samples were subjected to Atomic Layer Deposition and the sol-gel coating process in order to obtain a titanium oxide and titanium carbide coating, respectively. Ti-gel carbon char samples were subjected to ceramisation. Pure carbon char coated with TiO and TiC was infiltrated with an Al alloy. The investigations of the obtained composite materials were performed using light microscopy, transmission and scanning electron microscopy for microstructure determination. Raman spectroscopy and X-ray analysis were performed, along with hardness and tribological tests. Crystallites were detected after infiltration of the porous samples with an Al alloy, which were up to several microns in size, depending on the selected coating. As a result of the investigation on coating samples, a significantly smaller presence of Al carbides was found. An increase of hardness and wear resistance of biomorphous composite materials containing the carbides phase was confirmed. The TiO2coating prevents the occurrence of a reaction during the infiltration process and the formation of Al carbides.

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