A catalyst device comprises a porous catalytically active inorganic membrane, means for presenting a fluid reactant to a first surface of the membrane and means for recovering a fluid reaction product from the second surface of the membrane. The membrane is preferably an anodic aluminum oxide membrane with a deposit of catalytically active material present within the pores, preferably concentrated in the ends of the pores adjacent the second surface of the membrane.
Nanoporous and single phase α-alumina membranes with pore diameters tunable over a wide range of approximately 60-350 nm were successfully fabricated by optimizing the conditions for anodizing, subsequent detachment, and heat treatment. The pore diameter increased and the cell diameter shrunk upon crystallization to α-alumina by approximately 20% and 3%, respectively, in accordance with the 23% volume shrinkage resulting from the change in density associated with the transformation from the amorphous state to α-alumina. Nevertheless, flat α-alumina membranes, each with a diameter of 25 mm and a thickness of 50 μm, were obtained without thermal deformation. The α-alumina membranes exhibited high chemical resistance in various concentrated acidic and alkaline solutions as well as when exposed to high temperature steam under pressure. The Youngs modulus and hardness of the single phase α-alumina membranes formed by heat treatment at 1250 °C were notably decreased compared to the corresponding
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Rising pharmaceutical industry growth along with growing demand from other applications is projected to drive growth of this market over the forecast period. The global aluminum oxide market is anticipated to observe significant growth over the forecast due to growing demand from ceramic industries for manufacturing porous ceramics. Exposure to aluminum oxide causes health concerns. This factor may curb the growth of aluminum oxide market.. The report includes detailed competitive landscape of the global aluminum oxide market and an analysis of Porters five forces model for the aluminum oxide market has also been included. It includes company market share analysis, product portfolio of the major industry participants. The report provides detailed segmentation of the aluminum oxide market based on application and region segment.. Request Report TOC (Table of Contents) @ goo.gl/7gj4va. The aluminum oxide market is segmented on the basis of application into pharmaceutical industry, ceramic ...
Page contains details about platinum nanowires cluster film on disordered anodic aluminum oxide . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
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Synonyms for aluminium oxide in Free Thesaurus. Antonyms for aluminium oxide. 2 synonyms for aluminium oxide: alumina, aluminum oxide. What are synonyms for aluminium oxide?
The performance of membranes in various processes is largely dependent ontheir morphological properties. Thus, membrane structure has been continuouslyoptimised for different applications. Anodic alumina membranes (AAMs) exhibitself-ordered pore structure and the pore size can be tuned in the sub-micrometrerange. The aim of this PhD project is to propose and develop AAMs for theapplications of membrane filtration and emulsification with potential for scale-up.In the project, the AAMs were initially fabricated in flat sheet form to optimise theprocess parameters to obtain membranes with a high quality of pore structure.The membrane pore diameter can be readily controlled by the anodizationvoltage. While AAMs are normally symmetric, by manipulating the anodizationvoltage, asymmetric AAMs consists of stem pores and active pores have beensuccessfully made. After that, the flat AAMs with symmetric and homogeneousstructure were used as a platform to study for surface modification and fluidtransport in ...
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BioMed Research International is a peer-reviewed, Open Access journal that publishes original research articles, review articles, and clinical studies covering a wide range of subjects in life sciences and medicine. The journal is divided into 55 subject-specific sections.
The invention encompasses a method of forming a silicon-doped aluminum oxide. Aluminum oxide and silicon monoxide are co-evaporated. Subsequently, at least some of the evaporated aluminum oxide and silicon monoxide is deposited on a substrate to form the silicon-doped aluminum oxide on the substrate. The invention also encompasses methods of forming transistors and flash memory devices.
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A new approach for controlling and to functionalise nanoporous anodic alumina oxide (AAO) membranes is described. Our approach is predicated on the remarka
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The report including six parts, the first part maainly introduced the product basic information; the second parts mainly analyzed the Asia Aluminum oxide industry; the third part mainly analyzed the North American Aluminum oxide industry; the fourth part mainly analyzed the Europe Aluminum oxide industry; the fifth part mainly analyzed the market entry and investment feasibility; the sixth part was the report conclusion chapter ...
Anodic aluminum oxide (AAO) membranes use chromic acid, sulfuric acid, oxalic acid & phosphoric acid for their formation. Porous and non-porous membranes .. By Blue Belton
TY - CONF. T1 - In-situ measurements of alumina particle size and optical constants in composite solid propellant flames. AU - Brewster, Quinn. AU - Parry, David L.. PY - 1987/1/1. Y1 - 1987/1/1. N2 - The complex refractive index (n-ik) at 0.6328ym and the effective optical diameter of alumina particles in ammonium perchlorate (AP) composite solid propellant flames were measured in-situ using an inverse light scattering technique. Measured bidirectional reflectance and transmittance values were used to obtain n values, between 1.3 and 1.8 and k values between 0.04 and 0.6. The effective alumina diameter was determined (by the absence or existence of solutions to the Inverse scattering problem) to be between 0.26 and 0.30 um. Forward scattering dominated back scattering to such an extent that even a linear anisotropic scattering model would be inaccurate in describing the radiative transport. The alumina single scattering albedo was found to be in the range 0.5 to 0.7.. AB - The complex ...
TY - JOUR. T1 - Gas permeability and mechanical properties of porous alumina ceramics with unidirectionally aligned pores. AU - Isobe, Toshihiro. AU - Kameshima, Yoshikazu. AU - Nakajima, Akira. AU - Okada, Kiyoshi. AU - Hotta, Yuji. PY - 2007/1/1. Y1 - 2007/1/1. N2 - Porous alumina ceramics having unidirectionally aligned cylindrical pores were prepared by extrusion method and compared with porous ceramics having randomly distributed pores prepared by conventional method, and their gas permeability and mechanical properties were investigated. SEM micrographs of the porous alumina ceramics prepared by the extrusion method using nylon fibers as the pore former showed excellent orientation of cylindrical pores. The bending strength and Weibull modulus of the extruded porous alumina ceramics with 39% porosity were 156 MPa and 17, respectively. These mechanical properties of extruded samples were higher than those of the conventional porous alumina ceramics. The strength decreased from 156 to 106 ...
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Aluminium oxide, also known as aluminum oxide, is a chemical compound made from aluminium and oxygen. Its chemical formula is Al2O3. It is a normally white, powdery solid. It does not exist in a particular form. It can dissolve in acids and bases. It is used as an abrasive (sandpaper is an abrasive). It comes in bauxite and corundum. It does not melt easily. It is dissolved in a cryolite melt and electrolyzed to make aluminium. ...
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The International Trade Administration and/or International Trade Commission have recently announced the following actions in antidumping and/or countervailing duty cases.. For more information on AD/CV duty issues, including how to mitigate liability, please contact trade attorney Kristen Smith at (202) 730-4965.. Aluminum oxide - continuation of AD duty order on refined brown aluminum oxide from China, effective March 6. Electrical steel - sunset review determination that revocation of CV duty order on non-oriented electrical steel from Taiwan would likely lead to continuation or recurrence of material injury within a reasonably foreseeable time, which will result in the renewal of this order. Glass containers - scheduling of final phase of CV injury investigation of glass containers from China, with hearing scheduled for May 6, pre-hearing briefs due April 29, post-hearing briefs due May 14, and final comments due June 5. New reviews - initiation of administrative reviews of AD and/or CV duty ...
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2015) Biocompatibility of nanometre scale porous anodic aluminium oxide membranes towards the RK 13 epithelial cell line: A preliminary study. International Journal of Research in Medical Sciences, 3 (3). pp. 1583-1588. Poinern, G.E.J., Le, X., Loomes, C. and Fawcett, D. ...
Alumina (Aluminum oxide, Al2O3) has been in clinical use as an articulating material in Total Hip Replacement for more than 40 years. Ceramic bearings were introduced to reduce wear and increase long-term survivorship of total hip arthroplasty and alumina ceramic-on-ceramic bearings have gained popularity in hip arthroplasty because of their properties of low wear and chemical inertness. Advances in technology have reduced the risk of fracture of ceramic total hip arthroplasty implants; the recent introduction of the alumina matrix composite material offers an even wider range of applications because of its significantly enhanced mechanical properties when compare to alumina. In addition, rigid quality assurance and good manufacturing practices have also contributed greatly to the current reliability of modern ceramic bearings. Although concerns still remain about fracture and noise, ceramic components continue to provide an option for the young and more active patient and for a measure to ...
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