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Showing 1 to 12 of 12 for “"SiO2-TiO2"”.
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Laser produced SiO2/TiO2 coating on stainless steel substrate with sol-gel processes.
… M. Atik and his colleagues reported that SiO2-TiO2 sol-gel film was deposited on stainless steel (SS 316L) by furnace treatment for corrosion protection. Furnace heating as the densification of sol-gel coating film has, however, the disadvantages such as the limitation of sample size due …
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Energy transfer and waveguide studies of Eu3+ and Tb3+ doped 2 SiO2-TiO2 glass prepared via the sol-gel route
In recent years, waveguide studies have played an active role in the telecommunication industry. High doping concentrations are essential in the manufacture of short and compact optical amplifiers, yet quenching can reduce the performance of the amplifier. Sol-gel chemistry, combined with the …
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Electromechanical response of textured ferroelectric PZT thin film stacks
… stack. These additional layers serve as seeding (TiO2), buffer (SiO2), and conducting (Pt) layers with substantial thickness and stiffness compared to the main PZT layer. As a result, quantitative understanding of the mechanical behavior of each layer is required in order to extract the …
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Studies of the formation of homogeneous mixed silicon-titanium/zirconium oxides by the sol-gel route
… route. Methods of preparing homogeneous Si02-TiO2 gels and SiO2-Zr02 gels have been explored. In this work bis(acetylacetonato)titanium diisopropoxide or bis(acetylacetonato)zirconium dipropoxide and tetraethyl orthosilicate (TEOS) have been hydrolysed simultaneously in iso-propanol to form …
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Durability problems of the archaeological construction materials in aqueous and subaerial environments, with applications for restoration and conservation in Egypt and Sudan
… surfaces, a newly synthesized nanomaterial of SiO2-TiO2 NPs/TEOS was applied and tested. The results showed the severity of each factor on the construction materials. In this sense, Sahure?s pyramid was affected mainly by climatic and environmental factors, earthquakes and the inner composition …
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Supported Cobalt Oxide Catalysts for the Preferential Oxidation of Carbon Monoxide: An in situ Investigation
… of metal-support compounds (MSCs). The supports SiO2, TiO2 and Al2O3 are well known for this phenomenon, and consequently, allow for the formation of silicates, titanates and aluminates, respectively. Support materials such as CeO2, ZrO2 and SiC, are not known for interacting strongly with …
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Optical resistance of dielectric coatings to multi-pulse femtosecond laser radiation /
… experimental investigations on multi-layer ZrO2/SiO2, HfO2/SiO2, Ta2O5/SiO2, TiO2/SiO2 high reflection coatings and single-layer TiO2 have yielded several important results. To summarize: stepwise change of LIDT values was experimentally observed at the wavelength where two-photon absorption …
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Development and Application of in Situ/Operando Spectroscopic Techniques for Understanding Active Sites and Surface Intermediate Species in Heterogeneous Catalysis
… catalysts supported on silica (zWOX/SiO2) and titania-promoted silica (zWOX/yTiOX/SiO2) were explored. Catalyst preparation via incipient wetness impregnation revealed that titania promotion significantly enhanced catalytic performance by balancing WOX dispersion and resistance to …
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Mineralogy and geochemistry of geophagic materials from Mashau Village in Limpopo Province, South Africa
… Geochemical analysis for major oxides content (SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, P2O5 and Cr2O3) indicated that both geophagic soils and parent rocks were mainly composed of silica and alumina. Trace elements geochemistry showed a depletion of LREEs and an enrichment of HREEs …
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Nanotoxicity of oxide-derived engineered nanomaterials: impact on cell viability and function, with conventional assays and evaluation of novel eicosanoid profiling
… the alveolar region. A panel of ENM (SiO2, TiO2, NiO, ZnO and CuO) were selected to span from the benign to the highly toxic. ENM prepared in suspension were applied to the cells at 100cm2/mL for 24 h. This doctoral thesis focused on addressing the following aims: 1. To assess whether …
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The Impact of Surface Modified Nanoparticles on the Performance of Polymer Solutions for Heavy Oil Recovery
… sols were prepared by adding silicon oxide (SiO2), aluminium oxide (Al2O3), and titanium oxide (TiO2) NPs, and in-situ prepared iron hydroxide (Fe(OH)3) NPs to polymer solutions of partially hydrolyzed polyacrylamide (HPAM) and xanthan gum (XG). In the second stage, the surface of the NPs …
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MICROELECTRODE ARRAY FOR CAPACITIVE TRANSDUCTION OF RETINAL RESPONSES
… acid (PFPA) on various oxide surfaces (SiO2, TiO2, Al2O3 and HfO2) to serve as the biotic-abiotic interface of the prototype neural device developed here. The monolayers were deposited by a series of techniques including self-assembly from solution, tethering by aggregation and growth …