Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 29 for “"Ta2O5"”.
-
Phase equilibria, thermal expansion and symmetry relations within the HfO2-Ta2O5-TiO2-temperature system
… rapid production of the high temperature HfO2-Ta2O5-TiO2 phase diagrams is presented that highlights the combined use of: (i) in-situ high temperature X-ray diffraction (up to 3000 ˚C), (ii) Thermal expansion measurements (iii) extraction of atomic motifs with associated material symmetry …
-
Macroporous Semiconductors Tantalum Oxide, (Oxy)nitride and Nitride for Photocatalytic Hydrogen Evolution
… three-dimensional ordered macroporous (3DOM) Ta2O5, TaON and Ta3N5 have been prepared and loaded with Pt co-catalyst (0.5 wt% and 3 wt %). Subsequently the photocatalytic activities with respect to hydrogen production using methanol as a sacrificial reagent were measured and compared with bulk …
-
Macroporous Semiconductors Tantalum Oxide, (Oxy)nitride and Nitride for Photocatalytic Hydrogen Evolution
… three-dimensional ordered macroporous (3DOM) Ta2O5, TaON and Ta3N5 have been prepared and loaded with Pt co-catalyst (0.5 wt% and 3 wt %). Subsequently the photocatalytic activities with respect to hydrogen production using methanol as a sacrificial reagent were measured and compared with bulk …
-
Study of Transport Properties of Tantalum Pentoxide for High Temperature Thermal Management and Water Purification Systems
… Two semiconductor oxide systems based on Ta2O5, one a high temperature radiative thermal management system and the other a photocatalytic water purification system, are explored. Of particular importance in designing and engineering such systems is the ability to identify and estimate both …
-
Hot corrosion behaviour of new candidates for thermal barrier coatings application in turbine simulated environments
… including Gd2Zr2O7, ZrO2 stabilized with Ta2O5, zirconia stabilized with both Ta2O5 and Y2O3 and zirconia stabilized with CeO2 and TiO2 is investigated. For YSZ case, the reaction between NaVO3 and Y2O3 produces YVO4 and leads to the transformation of tetragonal ZrO2 to monoclinic ZrO2. …
-
Revestimentos a base de Ta/Al2O3 produzidos por aspersão térmica sobre substrato metálico
… enough heat to ignite aluminothermic between Ta2O5 and aluminum. Upon reaching the plasma jet, the mixing powders react with the heat of the blaze, which provides sufficient energy for melting aluminum particles. This energy is transferred through mechanisms of self-propagating to the oxide, …
-
Synthesis, characterization, and photocatalytic activity of tantalum oxide thin films
… rate, a wider energy gap material, such as Ta2O5, that provides a higher cathodic potential and more flexibility in shifting the energy gap provides a possible alternative. Ta2O5 thin films were synthesized using a sol-gel method and deposited by dip-coating and spin-coating. The thicknesses …
-
Design, Fabrication and Applications of Organic-Inorganic Hybrid Systems
… nanoparticles including ZnO, TiO2, Ta2O5 and In(OH)3 were deposited on the surface of polystyrene colloidal particles. A systematic variation in the employed reaction conditions allowed a modulation in size, shape, morphology, shell thickness and inorganic contents of resulting …
-
Synthesis and Support of tantalum(V) Oxide for Insulation and Photocatalytic Applications
… due to its wide range of applications. Ta2O5 is appealing for high temperature insulation, photocatalysis, sensing of trace gas quantities, capacitance properties and bone implants just to name a few.
-
Preparations and Characterizations of Tantalum Pentoxide-Titanium Dioxide: Ceramics and Thin Films
… method was used to integrate thin films of Ta2O5-TiO2 onto silicon substrates. Precursor solutions were successfully prepared using Ta(OEt)5 and Ti(OEt) 4 in ethanol. Solution stability was shown to be influenced by several factors, including, Rw ratio, additions of HCl, and, most …
-
Effects of Magnesium Reduction on the Structure and Electrical Properties of Tantalum Oxide Aerogels
… of this technology. Tantalum pentoxide (Ta2O5) is stable under the oxidative potentials and acidic conditions of the ORR, but prior efforts have largely focused on carbon-Ta2O5-Pt catalysts which can still result in the degradation of the support. To develop a potential Ta2O5 support, the …
-
Synthesis, characterisation and properties of tantalum based inorganic nanofibres
… into more functional materials such as Ta3N5 and Ta2O5 was investigated. Nanofibres were initially formed and can reversibly be inter-converted between the three different nanometric phases (TaS2, Ta3N5 and Ta2O5) using simple solid-gas reaction, without significant loss of nanofibrous morphology. …
-
Synthesis and characterization of cationic contrast agents & imaging of articular cartilage using X-ray computed tomography and magnetic resonance
… molecule, and tantalum oxide nanoparticles (Ta2O5 NPs) for x-ray Computed Tomography (CT) imaging; and Gadopentetate-dilysine (Gd(DTPA)Lys2), a gadolinium small molecule for Magnetic Resonance (MR) imaging. These cationic contrast agents are attracted to the strong negative fixed charge of …
-
Mechanisms, Conditions and Applications of Filament Formation and Rupture in Resistive Memories
… insertion of a thin layer of titanium into a Pt/ Ta2O5/Pt structure to form a Pt/Ti/ Ta2O5/Pt device. A space charge limited (SCL) conduction model is used to explain the experimental data regarding SET process at low voltage ranges. The evidence for existence of composite copper/oxygen vacancy …
-
Examining Tantalum-Based Photocatalysts for Photoinactivation of E. coli
… work helped to determine if tantalum pentoxide (Ta2O5) and tantalum oxynitride (TaON) can photoinactivate E. coli (DH5-Alpha). The results support the extrapolation that these two tantalum-based oxides have the ability to photoinactivate E. coli, but quantification is arduous and challenging. …
-
Characterisation of Novel Resistive Switching Memory Devices
… inconsistent models have been proposed for the Ta2O5/TaOx bilayered structure, and it is difficult to quantify and optimize the performance, largely due to the lack of microscopic description of resistive switching based on experimental results. An indepth analysis of the TiN/Ta2O5/TaOx/TiN …
-
Eletro-oxidação de efluente contendo nitrogênio amoniacal na presença de cloreto
… membrane, were tested. In cell (1) was used Ti/Ta2O5- IrO2 anode was used. For cell (2), without cationic membrane, the a Ti/RuO2 anode was used. The removal of ammoniacal nitrogen was higher than 90% and the Chemical Oxygen Demand (COD) higher than 80%, for both sells. These results indicated …
-
Development, manufacture and application of a solid-state pH sensor using ruthenium oxide
… reducing agents. To reduce this interference, Ta2O5 and Nafion protective layers were studied. Using a combination of sputter deposited Ta2O5 (80 nm) and thermally cured drop-cast Nafion, an electrode was manufactured, which was immune to interference from dissolved oxygen, and resistant to …
-
Investigation Of High-k Gate Dielectrics And Metals For Mosfet Devices.
… dielectric materials like Tantalum pent oxide (Ta2O5), Hafnium oxide (HfO2), Zirconium oxide (ZrO2) and Aluminum oxide (Al2O3) gate oxides. Higher dielectric constant may lead to high oxide capacitance (Cox), which affects the threshold voltage (VT) of the device. The working potential of MOS …
-
Optical resistance of dielectric coatings to multi-pulse femtosecond laser radiation /
… 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 changes to …
Page 1 of 2