Study of Molecular Precursors of Group iv Metal Oxides by Tga-Ftir Coupling

1994 ◽  
Vol 346 ◽  
Author(s):  
Olivier Poncelet ◽  
Jean Guilment ◽  
Sylvie Truchet
Keyword(s):  
Thermal Treatment ◽  
Metal Oxides ◽  
Sol Gel ◽  
Group Iv ◽  
Lower Sensitivity ◽  
Molecular Precursors ◽  
Sol Gel Process ◽  
Ft Raman

ABSTRACTHalogenoalkoxides are promising molecular precursors useable in sol-gel technology. They exhibit a lower sensitivity towards hydrolysis than common alkoxides and so appear to be easier to handle. Some data about the structure of titanium chloroalkoxides, pure and with the addition of a controlled amount of water, were obtained using FT-Raman, while the effect of thermal treatment under nitrogen or oxygen was studied using TGA-IR coupling. Finally the oxide products were characterized by Raman and by ED-XRMA, proving mat chloroalkoxides could be used as molecular precursors of oxide by sol-gel process. We showed that TGA-FTIR coupling is a powerful tool in order to study a thermal treatment and could be used to optimize it.

Hybrid Nanocomposites Based on Metal Oxides and Polysiloxanes with Controlled Morphology

2007 ◽  
Vol 1007 ◽  
Author(s):  
Sorin Ivanovici ◽  
Christoph Rill ◽  
Claudia Feldgitscher ◽  
Guido Kickelbick
Keyword(s):  
Metal Oxides ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Hybrid Nanoparticles ◽  
Spectroscopic Methods ◽  
Metal Alkoxides ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Ft Ir ◽  
Controlled Morphology

ABSTRACTHybrid materials based on polysiloxanes and metal oxides (SiO2, TiO2, ZrO2) were prepared by hydrosilation of allyl acetoacetate (AAA) modified metal alkoxides (M(OR)4; M = Ti, Zr; R = ethyl, isopropyl) or vinyl triethoxysilane with poly(dimethylsiloxane-co-hydrosiloxane) (PDMS-co-PMHS). The obtained compounds acted as single-source precursors in the sol-gel process. Various spectroscopic methods showed the complete functionalization of the polysiloxane chains with the complexes. When alcohols were used as solvents in the sol-gel process, hybrid nanoparticles were obtained, as observed by dynamic light scattering (DLS) measurements, transmission electron microscopy (TEM), and spectroscopic methods such as NMR and FT-IR.

Epoxy resin modified with in situ generated metal oxides by means of sol-gel process

2011 ◽  
Vol 122 (3) ◽  
pp. 1792-1799 ◽  
Author(s):  
Federica Bondioli ◽  
Maria Elena Darecchio ◽  
Adrian S. Luyt ◽  
Massimo Messori
Keyword(s):  
Metal Oxides ◽  
Epoxy Resin ◽  
Sol Gel ◽  
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.

A general synthesis of mesoporous metal oxides with well-dispersed metal nanoparticles via a versatile sol–gel process

2013 ◽  
Vol 1 (12) ◽  
pp. 4038 ◽  
Author(s):  
Juanjuan Liu ◽  
Shihui Zou ◽  
Sha Li ◽  
Xiaofeng Liao ◽  
Yejiang Hong ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Sol Gel ◽  
Mesoporous Metal Oxides ◽  
Sol Gel Process ◽  
Mesoporous Metal ◽  
General Synthesis

Synthesis of Pseudoboehmite - Aging Effect

2019 ◽  
Vol 958 ◽  
pp. 5-10
Author(s):  
Antonio Hortencio Munhoz Jr. ◽  
Renato Meneghetti Peres ◽  
Leila Figueiredo Miranda ◽  
Raphael Cons Andrades ◽  
Matheus Francelino Bezerra da Silva ◽  
...  
Keyword(s):  
Surface Area ◽  
High Purity ◽  
Sol Gel ◽  
Aging Effect ◽  
High Specific Surface Area ◽  
Poly Vinyl Alcohol ◽  
Gamma Alumina ◽  
Aluminum Compound ◽  
Molecular Precursors ◽  
Sol Gel Process

The Pseudoboehmite is an aluminum compound used as an alumina precursor and it is produced by sol-gel process. The sol-gel process is a methodology to produce porous, vitreous or crystalline ceramics started by molecular precursors. Pseudoboehmite with high purity, high specific surface area and porous homogeneity was obtained by sol-gel process. The material was used to produce gamma-alumina with surface area ranging from 211.2-288.1m2/g. It was studied the effect of aging time, temperature of aging and poly (vinyl alcohol) addition in the synthesis.

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.

Spectroscopic study of group IV alkoxides as molecular precursors of metal oxides

1996 ◽  
Vol 11 (1) ◽  
pp. 37-49 ◽  
Author(s):  
J. Guilment ◽  
O. Poncelet ◽  
J. Rigola ◽  
S. Truchet
Keyword(s):  
Metal Oxides ◽  
Spectroscopic Study ◽  
Group Iv ◽  
Molecular Precursors
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