Zirconium Titanate: Synthesis and Processing of Fine Powders Prepared by Chemical Route

2006 ◽  
pp. 683-688
Author(s):  
Valter Ussui ◽  
Dolores R.R. Lazar ◽  
Nelson Batista de Lima ◽  
A.H.A. Bressiani ◽  
José Octavio A. Pascoal
Keyword(s):  
Zirconium Titanate ◽  
Chemical Route ◽  
Fine Powders ◽  
Synthesis And Processing

Zirconium Titanate: Synthesis and Processing of Fine Powders Prepared by Chemical Route

2006 ◽  
Vol 530-531 ◽  
pp. 683-688 ◽  
Author(s):  
Valter Ussui ◽  
Dolores Ribeiro Ricci Lazar ◽  
Nelson Batista de Lima ◽  
Ana Helena A. Bressiani ◽  
José Octavio A. Pascoal
Keyword(s):  
Metal Salt ◽  
Ceramic Powder ◽  
Ammonium Hydroxide ◽  
Molar Ratio ◽  
Precipitation Process ◽  
Zirconium Titanate ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Synthesis And Processing ◽  
Cylindrical Samples

A process for synthesis of fine zirconium titanate powders by chemical route is described. Zirconium/titanium molar ratio was varied from 0.67 to 1.5 and the powders produced were analyzed. The precipitation process comprises the mixture of zirconium and titanium metal salt solutions to ammonium hydroxide solution, followed by washing of the precipitate, calcination and grinding to result in zirconium titanate. The ceramic powder is then uniaxially pressed as cylindrical samples and sintered at 1400°C for 5 hours. The microstructure of fractured and thermally etched ceramic was observed by scanning electron microscopy, and crystal phase identifications were done by X-ray diffraction. At least two different zirconium titanate phases, ZrTiO4 and Zr5Ti7O24, were identified. Ceramic hardness was measured by Vickers indentation.

The Synthesis of Photocatalysts Using the Polymerizable-Complex Method

MRS Bulletin ◽  
2000 ◽  
Vol 25 (9) ◽  
pp. 27-31 ◽  
Author(s):  
Masato Kakihana ◽  
Kazunari Domen
Keyword(s):  
Energy Storage ◽  
Heterogeneous Photocatalysis ◽  
Complex Method ◽  
Water Decomposition ◽  
Chemical Route ◽  
Fine Powders ◽  
Semiconducting Oxides ◽  
Deposited Metal ◽  
Photocatalytic Reactions ◽  
The Many

Fine powders of semiconducting oxides loaded with deposited metal and/or metaloxide particles have been widely used as heterogeneous photocatalysts for innumerable chemical reactions. Among the many photocatalytic reactions, the splitting of water assisted by light has become one of the most active areas in heterogeneous photocatalysis, since it can be a promising chemical route for energy renewal and energy storage. The photocatalytic splitting of water on TiO2 electrodes, discovered by Fujishima and Honda in 1972, is a prototypic example of this technique, and there is a vast body of literature describing the potential application of TiO2-based photocatalysts for water decomposition. This has brought about a burst of research related to the development of many other photocatalytic systems.

scholarly journals Enhanced oxygen intake/release kinetics of BaYMn2O5+δ fine powders prepared by a wet-chemical route

2011 ◽  
Vol 119 (1395) ◽  
pp. 894-897 ◽  
Author(s):  
Teruki MOTOHASHI ◽  
Taku UEDA ◽  
Yuji MASUBUCHI ◽  
Shinichi KIKKAWA
Keyword(s):  
Release Kinetics ◽  
Oxygen Intake ◽  
Chemical Route ◽  
Fine Powders ◽  
Wet Chemical ◽  
Wet Chemical Route ◽  
Kinetics Of

Structures of chemically stabilized ceramics

1993 ◽  
Vol 51 ◽  
pp. 924-925
Author(s):  
Pratibha L. Gai ◽  
M. A. Saltzberg ◽  
L.G. Hanna ◽  
S.C. Winchester
Keyword(s):  
High Temperature ◽  
Calcium Nitrate ◽  
Nitrate Hexahydrate ◽  
Chemical Route ◽  
Cubic Form ◽  
Tetragonal Form ◽  
Wet Chemical ◽  
Wet Chemical Route ◽  
Final Composition ◽  
Aluminium Nitrate Nonahydrate

Silica based ceramics are some of the most fundamental in crystal chemistry. The cristobalite form of silica has two modifications, α (low temperature, tetragonal form) and β (high temperature, cubic form). This paper describes our structural studies of unusual chemically stabilized cristobalite (CSC) material, a room temperature silica-based ceramic containing small amounts of dopants, prepared by a wet chemical route. It displays many of the structural charatcteristics of the high temperature β-cristobalite (∼270°C), but does not undergo phase inversion to α-cristobalite upon cooling. The Structure of α-cristobalite is well established, but that of β is not yet fully understood.Compositions with varying Ca/Al ratio and substitutions in cristobalite were prepared in the series, CaO:Al2O3:SiO2 : 3-x: x : 40, with x= 0-3. For CSC, a clear sol was prepared from Du Pont colloidal silica, Ludox AS-40®, aluminium nitrate nonahydrate, and calcium nitrate hexahydrate in proportions to form a final composition 1:2:40 composition.

Green Synthesis of Cobalt Oxide Nanoparticles by a Starch-Assisted Method

2019 ◽  
Vol 9 (3) ◽  
pp. 362-370 ◽  
Author(s):  
D. Vaya ◽  
Meena ◽  
B.K. Das
Keyword(s):  
Photocatalytic Activity ◽  
Cobalt Oxide ◽  
Sol Gel ◽  
Complex Nature ◽  
Oxide Nanoparticles ◽  
Capping Agent ◽  
Chemical Route ◽  
Gel Method ◽  
Sol Gel Method ◽  
Cobalt Oxide Nanoparticles

Background: The properties of the material are altered when material size shifted towards nano-regime. This feature could be used for wastewater treatment process using model pollutant such as dyes. Recently, nanoparticles are synthesized by a green chemical route using different capping agents. This is the reason we adopt starch as green capping agent along with sol-gel method. Objective: To synthesize cobalt oxide nanoparticles by green chemical route and utilized it in degradation of dyes. Methods: Synthesis of cobalt oxide nanoparticles by sol-gel method using starch as a capping agent. The characteristics of surface modifications were investigated by UV-VIS, TEM, SEM, XRD and FTIR techniques. Results: Cobalt oxide nanoparticles synthesized and inhibited photocatalytic activity. Conclusion: Deactivation of photocatalytic activity due to complex nature of starch. This property can be used elsewhere as in light shielding applications to coat and protect surfaces in order to keep them cool and safe from damage as in the painting of vehicles, roofs, buildings, water tanks, etc.

Chemical Route to Yb14MgSb11 Composites with Nanosized Iron Inclusions for the Reduction of Thermal Conductivity

2021 ◽  
Vol 4 (4) ◽  
pp. 3748-3756
Author(s):  
Christopher J. Perez ◽  
Zhijie Chen ◽  
Willie B. Beeson ◽  
Sevan Chanakian ◽  
Kai Liu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Chemical Route ◽  
Nanosized Iron
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