Porous Alumina
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Alumina applied in bone regeneration: Porous α-alumina and transition alumina
Abstract Alumina is a polymorphic bioceramic that has been extensively investigated for application in bone regeneration. Dense α-alumina has been considered a suitable biomaterial for dental and orthopedic implants due to its superior mechanical properties. However, its use is limited due to its high inertia in a biological environment. Recent investigatio
Cerâmica. Publicado em: 2022
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2. Imidazolium-based Ionic Liquids Impregnated in Silica and Alumina Supports for CO2 Capture
Ionic liquids (ILs) physical immobilization in solid materials is a key strategy for developing efficient and low cost CO2 capture processes. In this work, two porous commercial substrates with different characteristics (silica and alumina) were impregnated with ILs by physical wet method. Imidazolium based IL combined with [Br]- and [Tf2N]- anions were used
Mat. Res.. Publicado em: 11/11/2019
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3. Evaluation of mechanical properties of porous alumina ceramics obtained using rice husk as a porogenic agent
Abstract The objective of this work was to evaluate the mechanical properties of porous alumina ceramics, using the rice husk as a porogenic element. The rice husk was milled and graded in two granulometry, <65 μm and 65-150 μm, and added in a high purity calcined alumina in the proportion of 5, 15 and 30 wt%. The samples were pressed by uniaxial pressing
Cerâmica. Publicado em: 2019-01
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4. Influence of sintering temperature on the development of alumina membrane shaped by centrifugal casting for gas separation
Abstract The development of ceramic membranes for the most diverse separation processes has gained high visibility, mainly due to their better performance in harsh environments in comparison to polymeric materials. Among the different techniques used to prepare tubular ceramic membranes, the centrifugal casting (CC) is interesting for obtaining highly homoge
Cerâmica. Publicado em: 2019-01
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5. Fabricación de alúmina anódica porosa de bajo costo: Un estudio comparativo de la morfología producida por uno y dos pasos de anodizado
ABSTRACT A simple and low cost method for the fabrication of Nanoporous alumina templates with potential applications for nanowires fabrication is described. As raw material, commercial aluminum has been used. The nanoporous templates obtained have a mean pore diameter of (20 ± 4) nm. The fabrication process consists mainly of two-step anodization. Both ste
Matéria (Rio J.). Publicado em: 2016-09
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6. Influence of Alumina Phases on the Molybdenum Adsorption Capacity and Chemical Stability for 99Mo/99mTc Generators Columns
Technetium-99m is the clinically most used radionuclide worldwide. Although many techniques can be applied to separate 99Mo and 99mTc, the most commonly used method is the column chromatography with alumina as stationary phase. However, the alumina nowadays used has limited adsorption capacity of molybdate ions which implies the need to develop or improve ma
Mat. Res.. Publicado em: 31/05/2016
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7. Production of porous ceramic materialusing different sources of alumina and calcia
ABSTRACTNumerous papers and publications report the use of microporous calcium hexaluminate (CaO.6Al2O3; CA6) as a key raw material for high temperature insulating materials. This material has unique properties with respect to chemical purity and mineral composition. Another important property of CA6 is its structure, which consists of platelet-shaped crysta
Matéria (Rio J.). Publicado em: 2015-09
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8. COMPARAÇÃO E CONSTRUÇÃO DE REATORES DE "MILD" E "HARD ANODISATION" PARA FABRICAÇÃO DE ALUMINA ANÓDICA POROSA
The mild anodization (MA) reactor is exemplified for its operational simplicity and its excellent control over the experimental parameters that are involved in the anodization process. This method provides porous anodic alumina films with a regular cell-arrangement structure. This offers a better cost-benefit ratio than the other equipment configurations tha
Quím. Nova. Publicado em: 2015-09
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9. Influencia de la porosidad en las propiedades magnéticas de arreglos de nanohilos de Ni
ABSTRACTThe hysteresis properties of ordered arrays of Ni nanowires, electrodeposited into cylindrical nanoporous alumina membranes were investigated. The effect of the nanowire geometry (diameter and length), the array order and the nanowires' volume fraction on the array coercivity and remanence were analyzed. Porous alumina membranes were produced by a tw
Matéria (Rio J.). Publicado em: 2015-09
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10. Experience on a Low Cost Way to Obtainal-Ti Ceramic Foams
An experience on a simple process for producing alumina-rutile-mullite ceramic foams by using aqueous particulate slurries is proposed. The sintering process is achieved in one unique thermal process at 1200 ºC in air. The description of the process, physical properties and morphological studies are reported. Microstructure is studied by using confocal opti
Mat. Res.. Publicado em: 2015-08
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11. Innovative Coating Method of MgAl2O4 or ZnAl2O4 on α-Al2O3 Spheric Nuclei
Structured materials composed of α-Al2O3 spheres covered with a porous and thin layer of MgAl2O4 or ZnAl2O4 were obtained. The innovative coating method developed consists in the formation of a precursor gel of MgAl2O4 or ZnAl2O4 by citrate-nitrate combustion method. The alumina spheres are submerged in this gel and then submitted to a drying process in vac
Mat. Res.. Publicado em: 2015-04
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12. Synthesis and characterization of Ni-Mo filler brazing alloy for Mo-W joining for microwave tube technology
A brazing process based on Ni-Mo alloy was developed to join porous tungsten cathode bottom and dense molybdenum cathode body for microwave tubes manufacture. The Ni-Mo alloy was obtained by mixing and milling powders in the eutectic composition, and applied on the surface of the components. The brazing was made at 1400 °C by using induction heating in hydr
Mat. Res.. Publicado em: 08/02/2013