Tungstate
Mostrando 1-12 de 85 artigos, teses e dissertações.
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1. Zinc tungstate: a review on its application as heterogeneous photocatalyst
Abstract ZnWO4 crystallizes in a monoclinic wolframite-like structure, which has been studied for applications in heterogeneous photocatalysis for degradation, oxidation, and reduction of various contaminants. This type of tungstate has proved to be an efficient photocatalyst under both ultraviolet and visible light irradiation and, when ZnWO4 forms a hetero
Cerâmica. Publicado em: 2022
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2. Polypyrrole Film Doped with Corrosion-Inhibitors Electropolymerized on AA 1100
Polypyrrole films doped with dodecylbenzenesulfonate (PPy/DBS) and with oxy-anions tungstate (PPy/DBS/TUN) and vanadate (PPy/DBS/VAN) were potentiostatically electropolymerized on aluminum alloy 1100 (AA1100). The corrosion protection of these films was evaluated by the variation of the corrosion potential (ECORR) with the immersion time and by electrochemic
Mat. Res.. Publicado em: 05/09/2019
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3. Addition of zirconium oxide to Biodentine increases radiopacity and does not alter its physicochemical and biological properties
Abstract Objectives: To evaluate the radiopacity of Biodentine (BD) and BD associated with 15% calcium tungstate (BDCaWO4) or zirconium oxide (BDZrO2), by using conventional and digital radiography systems, and their physicochemical and biological properties. Materials and Methods: Radiopacity was evaluated by taking radiographs of cement specimens (n=8) u
J. Appl. Oral Sci.. Publicado em: 01/04/2019
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4. Effect of Different Synthesis Methods on the Textural Properties of Calcium Tungstate (CaWO4) and Its Catalytic Properties in the Toluene Oxidation
Calcium tungstate (CaWO4) crystals were prepared by microwave-assisted hydrothermal (MAH) and polymeric precursor methods (PPM). These crystals were structurally characterized by X-ray diffraction (XRD), N2 adsorption, X-ray absorption near edge spectroscopy (XANES) and extended X-ray absorption fine structure (EXAFS) measurements. The morphology and size of
Mat. Res.. Publicado em: 16/04/2018
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5. Physicochemical properties of calcium silicate-based formulations MTA Repair HP and MTA Vitalcem
Abstract Objective This study aimed to analyze the following physicochemical properties: radiopacity, final setting time, calcium release, pH change, solubility, water sorption, porosity, surface morphology, and apatite-forming ability of two calcium silicate-based materials. Material and methods We tested MTA Repair HP and MTA Vitalcem in comparison with
J. Appl. Oral Sci.. Publicado em: 05/04/2018
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6. Heteropoly Tungstate Supported on Metal Oxide Catalysts for Liquid Phase Oxidation of Benzyl Alcohol with Hydrogen Peroxide
A series of metal oxide supported tungstophosphoric acid catalysts were prepared by impregnation. The physicochemical and acidic properties of these materials were characterized by a variety of different analytical and spectroscopic techniques, namely Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) method
J. Braz. Chem. Soc.. Publicado em: 2018-01
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7. Preparation of Zinc Tungstate (ZnWO4) Particles by Solvo-hydrothermal Technique and their Application as Support for Inulinase Immobilization
ZnWO4 particles were synthesized as a single-phase by a simple and easy solvo-hydrothermal technique using water-ethylene glycol mixture as solvent, without using surfactant. Physical properties of produced particles were analyzed by X-ray diffraction (XRD), infrared spectroscopy (FTIR), surface area (BET), particles size distribution and atomic force micros
Mat. Res.. Publicado em: 31/05/2016
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8. USING A DOE AND EIS TO EVALUATE THE SYNERGISTIC EFFECTS OF LOW TOXICITY INHIBITORS FOR MILD STEEL
Abstract Inhibitors are widely used to prevent corrosion in cooling-water systems, and their protective performance can be enhanced by combination. The aim of this paper is to identify possible synergistic effects between four low toxicity substances used as corrosion inhibitors for mild steel in industrial cooling-water systems. Electrochemical measurements
Braz. J. Chem. Eng.. Publicado em: 2015-03
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9. Apical adaptation, sealing ability and push-out bond strength of five root-end filling materials
This study compared the fluid filtration, adaptation to the root canal walls, and the push-out bond strength of two resin-based sealers and three calcium silicate-based retrograde filling materials. Fifty maxillary canines were shaped using manual instruments and the apical portion was sectioned. Retrograde cavities of 3-mm depth were prepared. The specimens
Braz. oral res.. Publicado em: 26/08/2014
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10. Celdas solares fotoelectroquímicas basadas en Bi2WO6
In this study, photoelectrochemical solar cells based on bismuth tungstate electrodes were evaluated. Bi2WO6 was synthesized by a hydrothermal method and characterized by scanning electron microscopy, UV-Vis reflectance spectroscopy, and X-ray powder diffraction. For comparison, solar cells based on TiO2 semiconductor electrodes were evaluated. Photoelectroc
Quím. Nova. Publicado em: 2014-04
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11. Influence of radiopaque fillers on physicochemical properties of a model epoxy resin-based root canal sealer
Objective: To verify the influence of radiopaque fillers on an epoxy resin-based sealer. Material and Methods: Experimental sealers were formulated by adding 20%, 40%, 60%, 80%, 100% and 120% of calcium tungstate, ytterbium trifluoride or barium sulphate by weight to an epoxy-resin-base. Setting time, flow, film thickness, radiopacity, sorption, solubi
J. Appl. Oral Sci.. Publicado em: 2013-12
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12. Estudo espectroscÃpico de materiais: a mÃtipla aplicabilidade da espectroscopia Raman na caracterizaÃÃo de aminoÃcidos, molibidato e tungstato de sÃdio, e Ãxidos nanomoldados. / Spectroscopic study of materials: The multiple applicability of Raman spectroscopy in the characterization of amino acids, molybdate and sodium tungstate, and nanostructured oxides.
A elucidaÃÃo da estrutura do aminoÃcido (C5H9NO4), molibidato (Na2MoO4) e tungstato (Na2WO4) de sÃdio, e Ãxidos nanomoldados (CeO2, ZrO2, TiO2 e Ce0,8Zr0,2O2) foi realizada atravÃs da espectroscopia Raman. O Ãcido L-glutÃmico (C5H9NO4) foi investigado atravÃs de experimentos de espectroscopia Raman, visando avaliar os efeitos da aplicaÃÃo da press
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011