Papers by Keyword: Membrane

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Authors: Jean François Michaud, Marc Portail, Thierry Chassagne, Marcin Zielinski, Daniel Alquier
Abstract: The aim of this paper is to review the recent developments conducted by our groups for the achievement of 3C-SiC based heterostructures compatible for MEMS applications. It deals with different aspects, from the influence of the defects generated at the 3C-SiC/Si interface on the mechanical properties to the elaboration of new multilayered structures, required for specific applications like, for example, Atomic Force Microscopy.
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Authors: Dein Shaw, Hui An Hsieh
Abstract: The configuration of the system combines a liquid-filled lens, a flexible sensor membrane and a self-adjusted optical compensation device. We focus on optical compensation between the liquid-filled lens and the sensor membrane to make the system has good optical characters. For a single lens optical system, the curvy sensor membrane has better performance than flat type sensor in both the image quality of MTF, aberration and angle of view. To prove the idea, an optical measure system is developed and the optical system is also made. The experimental results show that this system do has a better performance in optical character.
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Authors: Sang An Ha, Dong Kyun Kim, Dong Won Lee, Byong Ho Jung, Jong Moon Lee, Jei Pil Wang
Abstract: The present study is aimed at deriving study factors appropriate for removal of heavy metals in a region with combined contamination of non-biodegradable organics or heavy metal ions in soil or underground water contamination or a region with underground water contamination using a composite alternating current electromagnetic field with combined modulation of an electric and a magnetic field. In addition, it is directed at deriving fundamental experiment, design factors that can be utilized in removing organic contaminants or metal-organic complexes having polarity of an electric charge. The continuous-type apparatus for fusion process in a composite alternating current electric field employed in the present study was designed to process a maximum of 260 L. Each configuration is provided with electrolytic decomposition apparatus, Magnetic Equipment, Power supply and Electrode plates with an adjustable distance between electrodes. By measuring oxidation and reduction processes of ions appearing in chemical reaction processes, electric potentials produced by injection of a negative reactivity electrode into an aqueous solution in a reversible redox equilibrium condition were measured.
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Authors: Hai Yan Kong, Ji Huan He
Abstract: This paper suggests a new method for fabrication of nanofibers with polymer liquid membrane, which is produced by a metal ring rotating through the polymer solution. The thickness of the produced membrane is thin and suitable for nanomaterial fabrication. In this paper the membrane is to form a polymer bubble by blowing air under the presence of a high electronic field, and multiple jets eject when the bubble is ruptured. The effect of applied voltage on the fiber diameter is studied.
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Authors: Cavus Falamaki, Jamileh Veysizadeh
Abstract: The fabrication of thin nanoporous TiO2 layers (thickness < 2 μm) on functionally graded porous alumina (thickness = 2 mm) is reported for the first time. The membrane is produced by dip coating TiO2 sols on the alumina support. The alumina porous support is produced using centrifugal casting with an acceleration of 3000g .The average pore size of the support is ca. 0.5 μm while its upper surface on which the membrane layer is deposited has an average pore diameter of 0.38 μm and average porosity of 10.7 %. The sol is produced by the peptization technique using tetrapropylorthotitanate as precursor. For the first time, a synthesis procedure has been implemented which allows the production of TiO2 sols with average particle sizes from12 to 22 nm. Using the BET technique, the average pore size and meso-porosity of the unsupported sintered TiO2 membranes as a function of sintering temperature and ZrO2 impurity concentration (0.0, 0.2, 0.6 and 1.0 wt. % of ZrO2) have been determined. The kinetics of the membrane layer anatase to rutile transformation reaction has been investigated as a function of ZrO2 impurity concentration introduced to the TiO2 sol during its preparation. The lack of macrocraks in the ultrafilter layer of the sintered composite was confirmed using the gas permeability and SEM techniques. The main outcome of this work is that the support has an outstanding low surface roughness (< 0.4 μm) allowing deposition of a defect free single layer of TiO2 in one step
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Authors: Shi Zhong Chen, Shi Yu Xing
Abstract: The proton exchange membrane (PEM) plays a key role on performance of PEM fuel cell. This paper reviewed recent developments of perfluorinated and partially fluorinated PEMs for PEM fuel cells.Comparative analysis of various PEM parameters was presented. Perfluorinated sulfonic PEMs with better technology have the issues of complicated preparation process and high cost.Partially fluorinated PEMs have lower price,but performance is not good enough.
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Authors: Marjan Farnam, Hilmi Mukhtar, Azmi Mohd Shariff
Abstract: Polymeric membranes are widely used for gas separation purposes but their performance is restricted by the upper bound trade-off discovered by Robeson in 1991. The polymeric membrane can be glassy, rubbery or a blend of these two polymers. This review paper discusses the properties of glassy polymer membranes and their performance in gas separation. The area of improvement for glassy membrane with development of mixed matrix membrane is also highlighted.
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Authors: Supawan Vichaphund, Duangduen Atong
Abstract: This work aimed to investigate the effect of different sintering routes on properties of Ni-Al2O3 membrane. Alumina powder was mixed with 10 wt% nickel powder by dried ball-milling. Then, the mixture powder was uniaxially pressed to a bar shape and sintered via different sintering conditions. First route, the Ni-Al2O3 specimen was sintered at 1300°C for 2 h under air and then reduced at 900°C for 2 h under H2 atmosphere. Second route, the specimen was sintered at 1300°C for 2 h under argon. After sintering process, the physical and mechanical properties of membrane obtained from two routes were compared and discussed.
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Authors: Petr Fajman, Jiří Máca
Abstract: One of the most impressive membrane structures in our country is the roofing of the K Barrandovu tram stop in Prague. Cable and membrane structures must permanently be kept under tensile prestress. The stress magnitude at zero load depends on the structural design, the final shape of the structure and its shape in production. The measurements of 2009 and 2012 pointed out the problem that some cables showed zero prestress.
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Authors: S. M. Javaid Zaidi
Abstract: Fuels are being considered an as environmental friendly technology and are making headlines across the globe as clean and reliable alternate energy source for transportation, stationary and portable power applications. The rapid developments taking place in all the leading research laboratories in the world are making fuel cell closer to the realization. The progress of PEM fuel cell is closely related to the development of solid polymer electrolyte membranes as it defines the properties needed for other components of the fuel cell. So far perfluorosulfonated membranes such as Nafion have been found useful in these fuel cells and are the only material of choice available commercially. But these membranes are very expensive and have other drawbacks, which acts as an impediment for the commercialization of this technology. As a result alternative cheaper membrane materials have been developed. For the development of new or novel membranes mainly three strategies have been used: (1) modifying the currently used ionomer membranes (2) synthesizing new polymeric membranes and (3) develop new polymer composites by blending the two polymers or composting with an inorganic material. The composite membrane approach (3) has been widely used to tackle the problem of methanol crossover and temperature stability.
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