Fabrication of TiO2/SiO2 multilayer film structure by the sol–gel process with efficient thermal treatment methods

2012 ◽  
Vol 263 ◽  
pp. 69-72 ◽  
Author(s):  
Koohee Han ◽  
Jung Hyeun Kim
Keyword(s):  
Thermal Treatment ◽  
Multilayer Film ◽  
Sol Gel ◽  
Film Structure ◽  
Treatment Methods ◽  
Sol Gel Process

Improvement in Mechanical Property of SiO2 Films Prepared by Sol-Gel

2013 ◽  
Vol 744 ◽  
pp. 269-272 ◽  
Author(s):  
Pei Tao Guo
Keyword(s):  
Mechanical Property ◽  
Thermal Treatment ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Sol Gel ◽  
Dimethyl Formamide ◽  
Good Mechanical Property ◽  
Chemical Additives ◽  
Sol Gel Process ◽  
Silica Sols

Silica films prepared by the base catalyzed sol–gel process show poor mechanical property. In this study, silica anti-reflective films with good mechanical property have been prepared by the catalyzed sol–gel process with dimethyl formamide added as drying control chemical additives. The silica sol was first dip deposited onto substrate to form films on both sides of the substrate and then subjected to thermal treatment. After thermal treatment, the film was achieved due to the formation of porous structure in the resultant film as a result of decomposing tetraethylorthosilicate and dimethyl formamide. Nano-indenter measurement shows that the Young’s modulus and hardness of base catalyzed films are 10-20GPa and 0.25-0.55GPa, respectively. But the films added with dimethyl formamide are much better than those films derived from base-catalyzed silica sols, the Young’s modulus and hardness are 32-39GPa and 1.22-1.47GPa, respectively. The good mechanical properties make such films potential in both military and civil applications.

Preparation of Superconducting YBa2Cu3O7−x Compounds By Water Extraction Variant Of Sol-Gel Process

1990 ◽  
Vol 180 ◽  
Author(s):  
A. Deptula ◽  
W. Lada ◽  
T. Olczak ◽  
T. zoltowski ◽  
A. Di Bartolomeo
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Ammonium Hydroxide ◽  
Water Extraction ◽  
Spherical Particles ◽  
Acidic Solutions ◽  
Sol Gel Process

ABSTRACTThe starting sols were prepared by addition of ammonium hydroxide to acidic solutions of Y-Ba-Cu acetates or by dissolving solid Ba9CO9 or CuCO9.CuCOH)2H2O in acetates of the remaining components. The sols were then gelled to spherical particles with diameter below 50μm by extracting water with 2-ethyl-l-hexanol or to shard by evaporation of water. After thermal treatment of both powders amorphous and then crystalline YBa2Cu,9O7−x were obtained. Formation of these compounds is strongly improved by aging the gel at 200°C. Green and sintered pellets exhibit excellent superconductivity properties.

Preparation of BSCCO Precursors by Water Extraction Variant of Sol-Gel Process

1992 ◽  
Vol 271 ◽  
Author(s):  
A. Deptula ◽  
W. Lada ◽  
T. Olczak ◽  
A. Di Bartolomeo
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Water Extraction ◽  
Sol Gel Process ◽  
Emulsion Drops ◽  
Preparation Step

ABSTRACTThe starling acetate sols of molar compositions of Bi:Pb:Sr:Ca:Cu=I-2:O:2:l: 2, 11–2:0:2:2:3 and 111–1.6:0.4:2:2:3 were prepared by NH4OH addition at various rates, followed by evaporation. Sols were gelled by further evaporation to shard or to microspheres (diameter below 100 μm) by water extraction from the sol emulsion drops formed in 2-ethyl-l-hexanol. The gels were converted to BSCCO phases by thermal treatment. The processes were characterized by XRD and IR examinations. The influence of the sol preparation step connected with formation of polynuclear cations on the following stages of the process was examined.

Effects of thermal treatment on the structure and luminescent properties of Eu 3+ doped SiO 2 –PMMA hybrid nanocomposites prepared by a sol–gel process

2016 ◽  
Vol 170 ◽  
pp. 588-593 ◽  
Author(s):  
Filipe Augusto de Jesus ◽  
Simei Tarse Sobrinho Santos ◽  
José Maurício Almeida Caiut ◽  
Victor Hugo Vitorino Sarmento
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Hybrid Nanocomposites ◽  
Sol Gel Process

Controllable synthesis of the Al4B2O9 nanowhisker and their applications in reinforced polyhydroxyalkanoate composites

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 42627-42632 ◽  
Author(s):  
Zhao-Jun Mo ◽  
Zhi-Hong Hao ◽  
Qing Yang ◽  
Li Zhao ◽  
Jian-Ping Xu ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Aluminum Borate ◽  
Controllable Synthesis ◽  
Treatment Methods

Large quantities of aluminum borate (Al4B2O9) nanowhiskers have been successfully synthesized by sol–gel and post-thermal-treatment methods.

scholarly journals Europium-Doped Sol-Gel SiO2-Based Glasses: Effect of the Europium Source and Content, Magnesium Addition and Thermal Treatment on Their Photoluminescence Properties

Molecules ◽  
2018 ◽  
Vol 23 (7) ◽  
pp. 1768 ◽  
Author(s):  
Hussein Fneich ◽  
Nathalie Gaumer ◽  
Stéphane Chaussedent ◽  
Wilfried Blanc ◽  
Ahmad Mehdi
Keyword(s):  
Thermal Treatment ◽  
Glass Structure ◽  
Sol Gel ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Aqueous Environment ◽  
Silica Glasses ◽  
Sol Gel Process ◽  
Before And After ◽  
Mg Addition

Rare-earth doped silica-based glasses lead the optical materials due to their tailorable spectroscopic and optical properties. In this context, we took advantage of the sol-gel process to prepare various Eu-doped silica glasses to study their luminescent properties before and after annealing at 900 °C. The effect of magnesium on these properties was studied in comparison with Mg-free-glass. Using TEM, nitrogen sorption, XRD and FT-IR, we confirmed that the magnesium modifies the glass structure and the thermal treatment eliminates the aqueous environment, modifying the structure ordering. The emission spectra and the decay time curves show the advantages of the Mg addition and the annealing on the photoluminescent properties.

Preparation and property of TiO2/SiO2 multilayer film on the fabric by sol-gel process

2013 ◽  
Vol 14 (7) ◽  
pp. 1101-1106 ◽  
Author(s):  
Xiaoyan Liu ◽  
Fangfang Huang ◽  
Weidong Yu
Keyword(s):  
Multilayer Film ◽  
Sol Gel ◽  
Sol Gel Process

Preparation Of Pt/WO3 Powders and Thin Coatings on Carbon Black and Metal Supports by The Complex Sol-Gel Process (CSGP)

1997 ◽  
Vol 496 ◽  
Author(s):  
A. Deptula ◽  
W. Lada ◽  
T. Olczak ◽  
B. Sartowska ◽  
A. Ciancia ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Thermal Treatment ◽  
Carbon Black ◽  
Sol Gel ◽  
Molar Ratio ◽  
Thin Coatings ◽  
Ascorbic Acid Solution ◽  
Sol Gel Process ◽  
Immersion Technique ◽  
Metal Supports

ABSTRACTIn this work the CSGP was applied for preparation of Pt-WOx and its coatings on carbon black, silver and titan substrates. Saturated tungsten sol (0.15M) was prepared by dissolving (NH4)4W5O17 2.5 H2O in ascorbic acid solution. To this solution H2PtCl6 was added to obtain the molar ratio Pt:W=l. After evaporation and heating at 700°C for 2h homogeneous yellow-green powders were obtained. Another part of this solution was diluted with ethanol and after ultrasonic mixing used for preparation of coatings on Ag and Ti substrates by the immersion technique. Gel layers were dried at 200°C for 20h and then calcined at 700°C for 2h. The resulting white colored layers (thickness 10–65μm) were very adherent. Ascorbate aqueous tungsten-platinum sol diluted to 0.03 or 0.06 M ΣMe was used for preparation of Pt-W (10 and 20 %) catalyst by impregnation of carbon black Vulcan XC-72, followed by thermal treatment in air, argon and hydrogen atmospheres.

Magnetocrystalline Properties of Sr1.4Ba1.6Co2Fe24O41

2014 ◽  
Vol 975 ◽  
pp. 111-115
Author(s):  
Yvens Pereira dos Santos ◽  
Bruna da Costa Andrade ◽  
Marcelo Andrade Macedo
Keyword(s):  
Electrical Resistivity ◽  
Thermal Treatment ◽  
Coercive Field ◽  
Single Phase ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Hexagonal Structure ◽  
Preferential Orientation ◽  
Sol Gel Process ◽  
Pellet Form

Multiferroic Ba1.6Sr1.4Co2Fe24O41 with a Z-type hexagonal structure was obtained through the proteic sol-gel process with a single-phase, combined with thermal treatment at 1200 °C for 2 h. XRD analysis revealed the formation of a single phase, with preferential orientation in the case of a sample in pellet form. Magnetometry measurements revealed a low coercive field characteristic of Z-type hexaferrite, plus an electrical resistivity of approximately 2 × 109 Ω.cm that was considerably higher than expected.

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