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Showing 1 to 20 of 176 for “"TiO₂"”.
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Consolidation of Al-TiO₂ and Ti₃Al-Ai₂O₃ composite powders
… pressing and sinter-HIP of Ti₃Al-Al₂O₃ and Al-TiO₂ composite powders have been carried out under inert atmospheres. The Al-TiO₂ composite powders were produced by discus milling Al/TiO₂ powder mixtures followed by ball milling. The Ti₃Al-Al₂O₃ composite powders were produced by heating Al/TiO₂ …
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Characterization of third order nonlinearities in TiO₂ waveguides at 1550 nm
… allows for high-index-contrast waveguides. The TiO₂ waveguides studied for this thesis were single-mode, with dimensions 200nm x 900nm, deposited on oxidized silicon and overclad with a transparent polymer. The optical Kerr coefficient was measured using two methods: spectral broadening studies …
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Nuevos tio- y selenoderivados de carbohidratos en enfermedades degenerativas: cáncer y Alzheimer
En la presente Tesis Doctoral se han desarrollado nuevas familias de compuestos bioactivos frente a enfermedades complejas y multifactoriales, como son el cáncer y el Alzheimer. Gran parte de la investigación ha estado enfocada a la preparación de compuestos organoselénicos, que exhiben una amplia …
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Fabrication and characterization of poly(amide-imides)/TiO₂ nanocomposite gas separation membranes
Nanosized Ti0₂ rich domains were generated in-situ within poly(amide-imide) (PAl) and 6F-poly(amide-imide) (6FPAl) by a sol-gel process. The composite films showed a high optical transparency. The morphology of the Ti0₂ rich domains was observed by transmission electron microscopy (TEM). The Ti0₂ …
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TOWARD ENHANCED BIMODAL SENSING: TIO₂-COATED METALLIC NANOSTRUCTURES FOR ELECTROCHEMICAL ANDPHOTOELECTROCHEMICAL DETECTION
This thesis presents a study on the synthesis, modification, and optimization of titanium dioxide (TiO2) thin films for electrochemical and photoelectrochemical sensing applications. After preparing TiO2 films via a sol-gel process, using titanium isopropoxide as a precursor, a systematic …
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Mineralogy and provenance of the TiO₂ - ilmenite heavy mineral sand deposit of Nataka
The Nataka heavy mineral sand deposit occurs along the northeast Mozambique coastline. It comprises a regional Pleistocene elliptical structure extending from Somalia, passing through Kenya, Tanzania, Madagascar and Mozambique, to Richards Bay in South Africa. The deposit consists of fine- to …
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AuPt nano-alloys as reduction promoters for Co/TiO₂ Fischer-Tropsch catalysts
Cobalt-based catalysts for the Fischer-Tropsch synthesis are typically promoted with noble metals to achieve a more facile reduction of Co₃O₄ to the catalytically active metal, Co⁰. Hydrogen spillover is thought to be the dominant mechanism for the functioning of noble metals during the reduction …
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Fabrication of TIO₂-embedded PVDF membranes and their application in algae membrane bioreactor systems
Polyvinylidene difluoride (PVDF) membranes with and without TiO2 (5% by mass) were fabricated and applied for high-density algae cultivation in membrane algae bioreactors (MBR). Microalgae species Chlorella Vulgaris was cultivated in the MBR systems fed with artificial wastewater at a target solids …
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Composition modification of zinc titanate (Zn₂TiO₄) based sorbents for hot coal gas desulfurization
Advanced power generation systems require regenerable sorbents capable of removing sulfur from coal gas to low ppm levels. Zinc titanate (Zn₂TiO₄) based sorbents are currently the leading sorbent for sulfur removal at high temperatures (~700°C). Zinc titanate sorbents are still in need of …
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Pt and Pt-Pd cluster interaction with graphene and TiO₂ based supports: A DFT study
… defects present on the surface of graphene and TiO₂ based supports on supported metal clusters. The clusters considered are a Pt₃₈ cluster and a bimetallic Pt₃₂Pd₆ alloy. The defects considered on graphene based supports are monovacancy defective graphene, OH and COOH functionalised graphene. …
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Alkali/steam corrosion resistance of commercial SiC products coated with sol-gel deposited Mg-doped Al₂TiO₅ and CMZP
The corrosion resistance of two commercially available SiC filter materials coated with Mg-doped Al₂ TiO₅ and (Ca <sub>0.6</sub>.6' Mg<sub>0.52</sub>) Zr₄P₆O₂₄ (CMZP) was investigated in high-temperature high pressure (HTHP) alkali-steam environments. Coated specimen properties, including cold and …
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Μελέτη της ρόφησης υδατικών συμπλόκων του νικελίου στην επιφάνεια του οξειδίου του τιτανίου
Βασικός στόχος της παρούσας διατριβής είναι η αποσαφήνιση του τρόπου της διεπιφανειακής εναπόθεσης του νικελίου στην επιφάνεια της τιτάνιας, η οποία λαμβάνει χώρα στη διεπιφάνεια “τιτάνιας / ηλεκτρολυτικού διαλύματος”. Ο στόχος αυτός επιτεύχθηκε μέσω μιας κατάλληλης θεωρητικής και υπολογιστικής …
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Design of 3D Macroporous Inverse Opal TiO2 Binary and Ternary Composites Sensitized with Gold Nanoparticles and CdS Quantum Dots for Photocatalysis
<p>Materials composed of titanium (IV) oxide (TiO<sub>2</sub>) have received enormous scientific interest due to titania’s abundance, non-toxicity, and photocatalytic proficiency, however its large band gap limits its applicability under ambient conditions. Various attempts have been made to …
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Nanoscale heterojunctions of transition metal oxide and silicon for high-efficiency oxygen evolution reaction
… the heterojunction of anatase titanium dioxide (TiO₂) and Si is of our best interest. The heterojunctions of TiO₂ and Si have not only exhibit great synergies based on the bulk properties, but also have improved the photoelectrocatalytic efficiency experimentally. However, the mechanism for this …
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Interactions between titanium dioxide nanoparticle exposure and grazing organisms on periphyton biomass and community composition.
Titanium dioxide nanoparticles (TiO₂NPs) are important contaminants of emerging concern, due to their ubiquity and use in such a broad range of consumer products. Freshwater ecosystems represent the most important aquatic reservoir for TiO₂NPs. Outdoor stream mesocosm and indoor stream microcosm …
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