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Article
A detailed insight into the preparation of nanocrystalline TiO2 powders in supercritical carbon dioxide
This work reports detailed investigations for the preparation of nanostructured titania powders by a solvent-free sol–gel-derived process, operated in supercritical CO2 (SC-CO2) at high pressures (10–30 MPa) and ...
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Living Reference Work Entry In depth
Sol–Gel Processed Membranes
The adaptation of membranes to specific applications is achieved principally via tailor-made dense or porous top-layers coated on porous supports. The sol–gel process was introduced in ceramic membrane process...
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Article
Role of Lattice Oxygen in the Propane Combustion Over Pt/Yttria-Stabilized Zirconia : Isotopic Studies
Nanoparticles of platinum were dispersed on an oxygen ionically conducting support, Yttria-Stabilized Zirconia (YSZ), on non-doped zirconia and on silica. The role of the support oxygen lattice in the mechanis...
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Article
Densification mechanism involved during spark plasma sintering of a codoped α-alumina material: Part I. Formal sintering analysis
Spark plasma sintering (SPS) of a codoped α-alumina powder has been investigated at temperatures between 850 and 1200 °C. The “grain size versus relative density” trajectory showed a significant grain growth a...
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Chapter
Porous Materials and Membranes
The sol-gel process has been recognised as a very attractive, simple and versatile way for the preparation of catalysts, adsorbents and inorganic membranes [1, 2]. The two conventional routes, colloidal or pol...
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Article
Preferential Oxygen Transport in Nanophase Mesoporous Ceramic Ion Conducting Membranes
Recent data from the literature dealing with the influence on oxygen transport of porous nanophase ion conducting ceramics are reviewed, and then transposed to the design of mesoporous nanophase ceria-based me...
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Article
Zirconia-tungsten composites: synthesis and characterisation for different metal volume fractions
Zirconia-tungsten composites have been obtained by the densification of ceramic-metal powders. The influence of the sintering conditions and the metal volume fraction on the morphology, the porosity, the linea...
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Article
Synthesis and Texture of Mesophase Templated Silica Layers Seeded with Nanoparticles
Mesophase templated silica layers seeded with magnetic or non magnetic nanoparticles are prepared. The study of the interactions between the nanoparticles and the others compounds of the synthesis solution is ...
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Article
Sol-gel/co-precipitation method for the preparation and characterization of zirconia-tungsten composite powders
Sol-gel and co-precipitation are interesting processes in view to prepare ceramic-metal composite powder. Using metal salts as starting compounds it is possible in a first step to synthetise a mixed precipitat...
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Article
129Xe NMR Investigations for the Textural Characterization of Sol-Gel Derived Amorphous Microporous Silica
The aim of this work was to evaluate the potentialities of 129Xe NMR as an innovative technique for the textural characterization of microporous amorphous materials. We applied this technique to a series of so...
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Article
Synthesis of alumina gels in amphiphilic media
This work deals with the synthesis of alumina gels from aqueous solutions of aluminum chloride in the presence of cationic surfactant molecules. The effect on the sol-gel transition of the reagent concentratio...
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Article
Hydrolysis and condensation of transition metal alkoxide: Experiments and simulations
We present here an experimental and numerical study of the chemical and aggregative mechanisms for titanium alkoxide in a reverse micellar medium. NMR experiments were done to study the first step of the sol-g...
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Article
Synthesis of Alumina Gels in Amphiphilic Media
This work deals with the synthesis of alumina gels from aqueous solutions of aluminum chloride in the presence of cationic surfactant molecules. The effect on the sol-gel transition of the reagent concentratio...
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Article
Hydrolysis and Condensation of Transition Metal Alkoxide: Experiments and Simulations
We present here an experimental and numerical study of the chemical and aggregative mechanisms for titanium alkoxide in a reverse micellar medium. NMR experiments were done to study the first step of the sol-g...
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Article
Potentialities of an Innovative Technique Like 129Xe NMR and of Saxs for the Characterization of Microporous Sol-Gel Derived SiO2
Addition of surfactants in TEOS derived sols leads to micro- or mesoporous materials whose porous texture can be varied by changing the surfactant quantity and/or chain length. This series of materials, with a...
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Article
Synthesis of a microporous MgAl2O4 spinel from alkoxide sols containing acetylacetone
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Article
Tailoring the Microstructure of Polyimide-Silica Materials Using the Sol-Gel Process
Polyimide-silica materials have been prepared via the sol-gel process by mixing tetramethoxysilane with a polyamic acid. Two polyamic acids have been used. The first is obtained with an equimolar mixture of ox...
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Article
Functional Phosphate Alkoxysilanes for Facilitated Transport Membrane Materials
Sol-gel processing of heteropolysiloxanes containing phosphate groups has been investigated for potential applications in the synthesis of facilitated transport solid membrane. The co-hydrolysis-condensation o...
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Article
A New Category of Membranes Exploiting Potentiality of Organic/Inorganic Hybrid Materials
Organic/inorganic hybrid materials offer specific advantages for the realization of artificial membranes exhibiting high selectivity and flux as well as good thermal and chemical resistances. Preparations of h...
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Article
Deformation capability and protective role of zirconia coatings on stainless steel
ZrO2 coatings were obtained by the alkoxide route and deposited on to stainless steel using the dip-coating technique. The starting solutions were prepared by mixing zirconium tetrabutoxide, isopropanol, acetylac...
