The effect of an added seed on the phase transformation and the powder properties in the fabrication of Al2O3 powder by the sol-gel process

1996 ◽  
Vol 31 (20) ◽  
pp. 5321-5325 ◽  
Author(s):  
Chang -Seob Oh ◽  
G. Tomandl ◽  
Moon -Hwan Lee ◽  
Sung -Churl Choi
Keyword(s):  
Phase Transformation ◽  
Sol Gel ◽  
Al2o3 Powder ◽  
Sol Gel Process ◽  
Powder Properties

Low temperature synthesis of ultrafine α-Al2O3 powder by a simple aqueous sol–gel process

2006 ◽  
Vol 32 (5) ◽  
pp. 587-591 ◽  
Author(s):  
Jiang Li ◽  
Yubai Pan ◽  
Changshu Xiang ◽  
Qiming Ge ◽  
Jingkun Guo
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Al2o3 Powder ◽  
Sol Gel Process ◽  
Α Al2o3

Preparation of t-ZrO2 by a sol–gel process with carbon as a phase transformation promoter

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 34451-34455 ◽  
Author(s):  
Yu Liu ◽  
Weidong Chi ◽  
Hui Liu ◽  
Yueyang Su ◽  
Liang Zhao
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
Amorphous Carbon ◽  
Sol Gel ◽  
Cubic Phase ◽  
Sol Gel Process

Cubic phase ZrO2 can be synthesized with amorphous carbon as a phase transition promoter.

Photocatalytic reduction of Cr(VI) in aqueous solution using TiO2 nanoparticles prepared with various alcohols as solvent

2012 ◽  
Vol 66 (6) ◽  
pp. 1333-1339 ◽  
Author(s):  
Young Ku ◽  
Chia–Nan Lin ◽  
Wei–Ming Hou
Keyword(s):  
Phase Transformation ◽  
Tio2 Nanoparticles ◽  
Surface Area ◽  
Hexavalent Chromium ◽  
Sol Gel ◽  
Photocatalytic Reduction ◽  
Structure Characterization ◽  
Phase Transformation Temperature ◽  
Reduction Activity ◽  
Sol Gel Process

TiO2 nanoparticles were prepared with various linear alkyl chains of alcohols under a sol–gel process. The structure characterization and the photocatalytic reduction of hexavalent chromium of the TiO2 nanoparticles were investigated. The phase transformation temperature, crystal aggregation and surface area of prepared TiO2 samples were found to be strongly influenced by alcohol used. The phase transformation from anatase to rutile was retarded and the surface area was reduced for TiO2 prepared with alcohols of longer alkyl chain. TiO2 nanoparticles prepared with methanol or ethanol exhibited higher photocatalytic reduction activity of hexavalent chromium possibly due to greater and more positively charged surface area.

Preparation of anhydrous dicalcium phosphate, DCPA, through sol–gel process, identification and phase transformation evaluation

2008 ◽  
Vol 354 (32) ◽  
pp. 3854-3857 ◽  
Author(s):  
Hossein Eshtiagh-Hosseini ◽  
Mohammad Reza Houssaindokht ◽  
Mohammad Chahkandhi ◽  
Abbas Youssefi
Keyword(s):  
Phase Transformation ◽  
Sol Gel ◽  
Dicalcium Phosphate ◽  
Process Identification ◽  
Sol Gel Process

Influence of Ni doping on phase transformation and optical properties of TiO2 films deposited on quartz substrates by sol–gel process

2012 ◽  
Vol 258 (11) ◽  
pp. 4893-4897 ◽  
Author(s):  
Jianjun Tian ◽  
Hongmei Deng ◽  
Lin Sun ◽  
Hui Kong ◽  
Pingxiong Yang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Optical Properties ◽  
Sol Gel ◽  
Tio2 Films ◽  
Ni Doping ◽  
Sol Gel Process ◽  
Quartz Substrates

The crystallization of thin-film ceramics

1992 ◽  
Vol 50 (1) ◽  
pp. 338-339
Author(s):  
J.M. Schwartz ◽  
L.F. Francis ◽  
L.D. Schmidt ◽  
P.S. Schabes-Retchkiman
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Sol Gel ◽  
Processing Route ◽  
Small Areas ◽  
Ceramic Thin Films ◽  
Complex Shapes ◽  
Sol Gel Process ◽  
Ceramic Precursors ◽  
Crystalline Ceramic

Ceramic thin films and coatings are of interest for electrical, optical, magnetic and thermal barrier applications. Critical for improved properties in thin films is the development of specific microstructures during processing. To this end, the sol-gel method is advantageous as a versatile processing route. The sol-gel process involves depositing a solution containing metalorganic or colloidal ceramic precursors onto a substrate and heating the deposited layer to form a crystalline or non-crystalline ceramic coating. This route has several advantages, including the ability to create tailored microstructures and properties, to coat large or small areas, simple or complex shapes, and to more easily prepare multicomponent ceramics. Sol-gel derived coatings are amorphous in the as-deposited state and develop their crystalline structure and microstructure during heat-treatment. We are particularly interested in studying the amorphous to crystalline transformation, because many key features of the microstructure such as grain size and grain size distribution may be linked to this transformation.

Epitaxial Growth of Sr0.3Ba0.7Nb2O6 Thin Films Prepared by Sol-Gel Process

1999 ◽  
Vol 606 ◽  
Author(s):  
Keishi Nishio ◽  
Jirawat Thongrueng ◽  
Yuichi Watanabe ◽  
Toshio Tsuchiya
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Epitaxial Growth ◽  
Raw Materials ◽  
Substrate Surface ◽  
Sol Gel ◽  
Tungsten Bronze ◽  
Monomethyl Ether ◽  
Tetragonal Tungsten Bronze ◽  
Sol Gel Process

AbstructWe succeeded in the preparation of strontium-barium niobate (Sr0.3Ba0.7Nb2O6 : SBN30)that have a tetragonal tungsten bronze type structure thin films on SrTiO3 (100), STO, or La doped SrTiO3 (100), LSTO, single crystal substrates by a spin coating process. LSTO substrate can be used for electrode. A homogeneous coating solution was prepared with Sr and Ba acetates and Nb(OEt)5 as raw materials, and acetic acid and diethylene glycol monomethyl ether as solvents. The coating thin films were sintered at temperature from 700 to 1000°C for 10 min in air. It was confirmed that the thin films on STO substrate sintered above 700°C were in the epitaxial growth because the 16 diffraction spots were observed on the pole figure using (121) reflection. The <130> and <310> direction of the thin film on STO were oriented with the c-axis in parallel to the substrate surface. However, the diffraction spots of thin film on LSTO substrate sintered at 700°C were corresponds to the expected pattern for (110).

UV Curable Organic-Inorganic Hybrid Materials

2000 ◽  
Vol 628 ◽  
Author(s):  
Guang-Way Jang ◽  
Ren-Jye Wu ◽  
Yuung-Ching Sheen ◽  
Ya-Hui Lin ◽  
Chi-Jung Chang
Keyword(s):  
Hybrid Materials ◽  
Colloidal Silica ◽  
Sol Gel ◽  
Solution Ph ◽  
Uv Curable ◽  
Inorganic Hybrid ◽  
Degradation Temperature ◽  
Sol Gel Process ◽  
The Stability ◽  
Thermal Degradation Temperature

This work successfully prepared an UV curable organic-inorganic hybrid material consisting of organic modified colloidal silica. Applications of UV curable organic-inorganic hybrid materials include abrasion resistant coatings, photo-patternable thin films and waveguides. Colloidal silica containing reactive functional groups were also prepared by reacting organic silane and tetraethyl orthosilicate (TEOS) using sol-gel process. In addition, the efficiency of grafting organic moiety onto silica nanoparticles was investigated by applying TGA and FTIR techniques. Experimental results indicated a strong interdependence between surface modification efficiency and solution pH. Acrylate-SiO2 hybrid formation could result in a shifting of thermal degradation temperature of organic component from about 200°C to near 400°C. In addition, the stability of organic modified colloidal silica in UV curable formula and the physical properties of resulting coatings were discussed. Furthermore, the morphology of organic modified colloidal silica was investigated by performing TEM and SEM studies‥

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