Titania
Mostrando 1-12 de 81 artigos, teses e dissertações.
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1. Effects of addition of engineered ZnO nanoparticles on the stability of colloidal suspensions containing TiO2 interacting with sandy soil
Abstract The stability of colloidal suspensions of engineered nanoparticles in the environment is of great interest for the risk assessment and treatment of hazardous materials. The relevance of this study is due to the evidence that engineered nanoparticles have been produced and used in commercial products in large scale, especially ZnO and TiO2, which are
REM, Int. Eng. J.. Publicado em: 2020-06
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2. EVALUATION OF THE PHOTOCATALYTIC ACTIVITY OF SiO2@TiO2 HYBRID SPHERES IN THE DEGRADATION OF METHYLENE BLUE AND HYDROXYLATION OF BENZENE: KINETIC AND MECHANISTIC STUDY
Abstract Silica spheres coated with titania (SiO2@TiO2) were synthesized using chitosan as template. The N2 adsorption/desorption isotherms of the spheres point to meso and macroporous characteristics and the elemental mapping by EDS shows uniform distribution of Ti on the surface of the silica spheres, leading to formation of an amorphous structure (XRD). T
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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3. Solvothermal Synthesis of Cerium-Doped Titania Nanostructured Materials Modified with Acetylacetone for Solar-Driven Photocatalysis
This study reports the preparation of nanostructured cerium-doped titanium dioxide photocatalysts containing different cerium concentrations by a modified sol-gel route involving the use of acetylacetone. The nanocrystalline powders had their structural, morphological, and optical properties characterized by X-ray diffraction, vibrational and Raman spectrosc
J. Braz. Chem. Soc.. Publicado em: 2020-01
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4. Silica/Titania Graphite Composite Modified with Chitosan and Tyrosinase Employed as a Sensitive Biosensor for Phenolic Compounds
A mesoporous, high surface area and conductive silica/titania graphite composite modified with chitosan and functionalized with tyrosinase was prepared. The composite was obtained by the sol-gel method and the surface of the resultant material was modified with chitosan solutions containing 5, 10 and 15% by mass. The textural characterization showed that eve
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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5. Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn
São Simão’s Brazilian kaolinite has been treated with titanium(IV) isopropoxide and cobalt(II) tetracarboxymetallophthalocyanine under different conditions (acidic or basic), leading, after drying at 100 ºC, to new titania-doped cobalt(II)-metallophthalocyanine/kaolinite solids. These solids were characterized by chemical analysis, powder X-ray diffract
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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6. Iron oxide/titania composites for radar absorbing material (RAM) applications
Resumo Compósitos de óxido de ferro/titânia foram sintetizados pelo método de precipitação. A quantidade de óxido de ferro foi variada nos compósitos. Fase única (anatásio) foi obtida para a fração em massa de 0-20% e três fases (anatásio, magnetita e hematita) foram encontradas para as frações de 30% e 40% de óxido de ferro. O tamanho de cr
Cerâmica. Publicado em: 15/08/2019
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7. Biomimetic Coating of Mechanochemically Synthesized Zirconium Titanate
A biomimetic method was used to promote bioactivity of ZrTiO4. Zirconium titanate was obtained by using a combination of techniques such as mechanical milling and heat treatment of zirconia and titania powders. The effect of milling time on the evolution of the ZrTiO4 phase formation was studied. Powders were uniaxially pressed followed by heat treatment for
Mat. Res.. Publicado em: 10/07/2019
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8. Influence of Anodization Parameters in the TiO2 Nanotubes Formation on Ti-7.5Mo Alloy Surface for Biomedical Application
In this study, the effects of the parameters such as applied potential difference, time and annealing temperature in the titania nanotubes formation were evaluated. The morphology of the nanotubes was evaluted by using Field Emission Gun - Scanning Electron Microscope (FEG-SEM), Atomic Force Microscope (AFM), contact angle and X-rays diffraction (XRD). Self-
Mat. Res.. Publicado em: 24/07/2017
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9. Phosphate Modification of Nano Titania and Its Effect on the Photodegradation of EDTA
The surface of nano titania was phosphate modified and characterized by X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), energy dispersive X-ray analysis (EDX), and elemental analysis (CHN) to show the existence of phosphate in the modified nano titania. The resultant phosphated nano titania was applie
J. Braz. Chem. Soc.. Publicado em: 2016-10
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10. (Influência da titânia e óxido de ferro na coloração e friabilidade do óxido de alumínio blue fired como material abrasivo)
Resumo A qualidade dos grãos abrasivos é fundamental para o aumento da vida útil das ferramentas de desbaste, polimento e corte. Nesse contexto, o presente trabalho teve como objetivo avaliar as variáveis de tratamento térmico do óxido de alumínio eletrofundido marrom na obtenção do óxido de alumínio "blue fired". Este é um grão abrasivo com mel
Cerâmica. Publicado em: 2016-03
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11. Formation of Aluminum Titanate with Small Additions of MgO and SiO2
The formation of aluminum titanate was investigated by isothermal treatments of samples obtained from equimolar mixtures of alumina and titania, containing small amounts of silica and magnesia. Results of differential thermal analysis and Rietveld refinements of data collected by X-ray powder diffraction (XRPD) showed that additions of silica in amounts used
Mat. Res.. Publicado em: 26/02/2016
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12. Low Temperature Synthesis of Mixed Phase Titania Nanoparticles with High Yield, its Mechanism and Enhanced Photoactivity
A novel process was developed for the synthesis of a mixed phase (constituted of 66% anatase phase) of TiO2 nanoparticles at lower calcination temperature (400 oC) by the sol gel technique using a cost effective and easily available propanol solvent. Stereochemistry of propanol played a crucial role towards crystallographic phase of resultant TiO2nanoparticl
Mat. Res.. Publicado em: 26/02/2016