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Showing 1 to 15 of 15 for “"rutile TiO2"”.
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In-situ electron imaging of oxidation and reduction of rutile (TiO2) nanocrystals and interaction with palladium
… Rh/ZrO2 is used for fuel refinement, and Pt/TiO2 is an excellent photocatalyst. Since chemical reactions take place at surfaces and interfaces, the catalytic reactions are highly dependent on the oxide surface structure and the interface with metal nanoparticles. Further, the oxides undergo …
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Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy
… step, the formation of a thick adherent rutile TiO2 layer occurs which is followed by subsequent boost diffusion (step 2) wherein the oxide layer is decomposed to free up oxygen for boost diffusion hardening. Step 1 is characteristically conducted at 850°C for 30 minutes in an oxygen rich …
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Decorating Crystallites with Atoms and Small Molecules: A First-Principles Investigation
… onto semiconducting and insulating surfaces with rutile and rock-salt structures respectively, was investigated using van der Waals corrected-density functional theory. DFT-D3, DFT-TS, vdW-DF and its variants were employed to carry out the calculations. Surface energies and atomic displacements …
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Processing and Properties of Particulate Reinforced Carbon Matrix Composites
… detrimental to mechanical properties. Finally, rutile TiO2 was formed as a result of the heat treatment process. In considering environmental impact, cost, and mechanical properties, a balance must be maintained between higher temperature processing, duration, milling time, and porosity present …
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Structure-Sensitivity of CO Oxidation Over Supported Pt Catalysts in the Subnanometer Regime and Its Origin
… the size of Pt particles supported on anatase TiO2 and CeO2 and its origin. We varied the Pt nuclearity from single-atoms to subnanometer clusters (0.8-0.9 nm) to small nanoparticles (1.5-1.8 nm). By coupling density functional theory calculations and microkinetic modeling with kinetic …
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Single-crystal metal oxides and supported metal nanoclusters as model catalyst sytems
… we examine the adsorption behavior of phenol on rutile TiO2(110) and ultrathin films of alumina prepared on a NiAl(110) substrate. Electron paramagnetic resonance studies show that exposure of both γ-alumina and titania powder to phenol at 250°C results in the formation of persistent phenoxyl …
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Photothermal and Photoelectric Effects in Lithium-Ion Batteries: Mechanistic Insights and Performance Enhancement
… semiconducting metal oxide including anatase/rutile TiO2 and Fe2O3. Results indicated that photothermal effects dominated at the applying voltage which is below the energy gap between the conduction band minimum and Li plating/stripping potential, while a higher bias voltage activated …
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DEVELOPMENT OF MATERIALS AND ELECTRODES FOR MICROBIAL BIOELECTROLYSIS SYSTEMS AND MONITORING OF MICROBIOLOGICALLY INFLUENCED CORROSION
… by rational catalyst design. A core-shell IrO2@TiO2 catalyst was developed by depositing ultrathin IrO2 layers onto rutile TiO2 supports, achieving electrochemical performance comparable to commercial IrO2 while drastically lowering iridium loading. Crystallographic compatibility between rutile …
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Soft nanocomposites with enhanced electromechanical response for dielectric elastomer actuators
… nanocomposites consisting of high permittivity rutile TiO2 nanoparticles dispersed in thermoplastic block copolymer SEBS (poly-styrene-coethylene-co-butylene-co-styrene) are shown to exhibit permittivity increases of up to 3.7 times, leading to 5.6 times improvement in electrostatic energy …
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Surface-mediated mechanisms for defect engineering in metal oxides
… via an active site exchange mechanism in rutile titanium dioxide (TiO2) and wurtzite zinc oxide (ZnO), and (2) electric-field induced redistribution of charged defects in near-surface space charge regions in TiO2, ZnO and B-doped Si. Regarding active-site exchange, this work shows that the …
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Raman, Infrared, X-ray, and EELS Studies of Nanophase Titania
… investigated were amorphous titania, anatase TiO2, and rutile TiO2. Annealing-induced phase transformations from amorphous TiO2 to anatase to rutile were studied by Raman scattering, infrared reflectivity, infrared absorption, x-ray diffraction, and electron energy-loss spectroscopy (EELS). …
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The Effect of Zr-Doping and Crystallite Size on the Mechanical Properties of TiO2 Rutile and Anatase
TiO2 is an important technological material, used as white pigment, as wide band gap semiconductor in electrochemical dye solar cells, for photocatalysis and in photochemical energy-conversion processes. The most abundant phases are rutile, anatase and brookite. In addition, there are a number of …
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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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Lattice Dynamics in Temperature-driven and Photo-induced Phase Transitions
… unknown. Strong phonon softening and damping in rutile VO2 were revealed by our inelastic X-ray scattering (IXS) measurements. We reproduced the phonon softening and phonon damping in rutile VO2, as well as their absence in M1 VO2 and rutile TiO2, using first-principles simulations. Our …