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Showing 1 to 20 of 22 for “"Nanopowder"”.
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High elastic modulus nanopowder reinforced resin composites for dental applications
… thesis, a new family of high elastic modulus nanopowder reinforced resin composites and their mechanical properties are studied. Materials with higher elastic modulus, such as alumina and diamond, are used to replace the routine filler material, silica, in dental resin composites to achieve …
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Characterization and mechanical properties of solar grade silicon in granular and nanopowder form
… are produced, granular solid (1-3 mm) and nanopowders (30-300 nm). Grinding and fracture occurs in the granular solid during shipping and handling which can affect the final product properties and create safety issues. The microstructure and the morphology of both the granular and the …
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Nanocomposite coatings produced by electrodeposition from additive-free bath: the potential of the ultrasonic vibrations
… of the codeposition parameters. Two different nanopowder, i.e. silicon carbide and alumina, were added to a Watts type galvanic bath in order to produce the nanocomposites coatings and ultrasonic vibrations have been considered as an alternative to pitting control agents in order to produce …
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The formation of carbon nanofibers and thin films from the catalytic decomposition of ethylene by palladium
… sputtered film, foil, sub-micron powder, and nanopowder. The deposition of carbon can be achieved by a very simple method. In this method ethylene and oxygen or hydrogen are flowed through a single-zone, horizontal tube furnace at atmospheric pressure and temperatures typically from 550-700°C. …
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Nanoparticle-chiral nematic liquid crystal composites
… that a commercially available yttrium iron oxide nanopowder (purchased from Sigma-Aldrich Corporation) exhibited YIG and orthorhombic yttrium iron oxide (YFeO3) phases after being calcined at 800 °C for two hours. These nanoparticles were slightly smaller than desired, having diameters on the …
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Decellularized cartilage as a chondroinductive material for cartilage tissue engineering
… in determining a method to produce a homogenous nanopowder of DCC. Additionally, this research was the first to examine the ability of DCC to induce chondrogenesis in stem cells by quantifying gene expression of chondrogenic markers. The results demonstrate for the first time that DCC can indeed …
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Processing of nano-sized boron carbide powder
Recent studies indicate B4C nanopowder may provide additional advantages without loss of established properties. In this study, preliminary forms of graphite-coated B4C nanopowders on the order of 20-40 nm with various additives were sintered and analyzed. Methanol washing was performed on the …
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Synthèse de nanoparticules de carbure de fer dans un réacteur à plasma inductif
… has also been developed to collect the produced nanopowder in a liquid in order to minimize nanoparticle dispersion into the air, and protect pyrophoric nanoparticles from air exposure.
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Mixing of nanoparticles in a stirred tank in high pressure carbon dioxide
… in supercritical and gaseous CO_2. The obtained nanopowder mixture was pressed into a pellet. Mixture homogeneity was determined by means of composition variance analysis of the surface of the pellet using energy-dispersive spectroscopy (EDS). Effect of pressure in the range of 400 to 2000 psi, …
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Freeze Casting of Aqueous PAA-Stabilized Carbon Nanotube-Al2O3 Suspensions
… of nanostructured materials. A ceramic nanopowder is dispersed with a polymer in water, under carefully controlled pH. The suspension is cast into a suitable mold and frozen, then de-molded and exposed to a vacuum to sublimate and remove the water. Polymer adsorption and rheology were …
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Redox kinetics study for chemical-looping combustion, water and CO₂ splitting using nickel and cerium-based oxygen carrier
… NiO fine particles supported on YSZ nanopowder is tested, and superior kinetics and cyclic stability are observed. Fast oxygen exchange is achieved from 500 to 1000°C with sufficient utilization of the carrying capacity within 1 min. Improvement is attributed to the enhanced ionic …
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Vibrational spectroscopy of photosensitizer dyes for organic solar cells
… TiO2 substrates, anatase paste films and anatase nanopowder, was also studied to clarify the role of the carboxylate groups in the anchoring process of the dyes on the semiconductor surface. The recorded spectra indicate a strong dependence of the anchoring configuration on the morphology of the …
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Design of Titania Photocatalytic Membranes containing Fine Ceramic Fibres
… were used, one a commercially available anatase nanopowder and the other silver-coated anatase. The latter was produced via modification of the first. Optimisation of the nanoparticle loadings was performed via assessing their photocatalytic efficiency. Specific permeability values were obtained …
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Relation between surface structural and chemical properties of platinum nanoparticles and their catalytic activity in the decomposition of hydrogen peroxide
… known as platinum black and platinum nanopowder, and studied the effect of different reaction conditions on their rates of H₂O₂ decomposition. These samples have different particle size and surface chemisorbed oxygen abundance, which were varied further by pretreating both samples at …
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Enhanced fluidization of nanoparticle agglomerates
… can be dispersed in a gaseous medium. Nanopowders have a very high surface area to volume ratio which allows them have unique chemical and physical properties especially at the surface. Fluidization is a popular technique for the continuous dispersal of solid materials in the fluidlike …
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Electrodeposited metal matrix nanocomposites as thin films and high aspect ratio microstructures for MEMS
… components is examined. The effect of -Al2O3 nanopowder on copper reduction from acidic and basic electrolytes is examined with rotating disk electrodes (RDE’s). At pH 0.2, regions of copper inhibition and enhancement are identified in the kinetic regime. Low particle loading (12.5 g/L) …
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Silver nanoparticles and thin films for strained-silicon surface enhanced raman spectroscopy and capacitively-coupled radiofrequency heating
… high pressure, direct thermal evaporation of Ag nanopowder (source-to-substrate distance of 21 cm). Alternatively, Ag NPs synthesised via a chemical reduction technique (polyol process) using poly(vinylpyrrolidone) as the capping agent, as well as citrate stabalised NPs, were also dispersed onto …
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Synthesis, Processing And Characterization Of Nanocrystalline Titanium Dioxide
… materials, the pH and peptization time, TiO2 nanopowder was obtained after calcination at 400oC. The powder was analyzed for its phases using X-ray powder diffraction (XRD) technique. Crystallite size, powder morphology and lattice fringes were determined using high-resolution transmission …
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Standardization of recycled plastic materials for additive manufacturing
… PLA with the addition of 7% titanium dioxide nanopowder has similar thermal and mechanical properties to the primary polymer, considering the standard deviation. Finally, to ensure the quality of the received nanocomposite and the reproducibility of the properties, the quality indicators have …
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Partial and Total Oxidation of Methane in Monolithic Catalysts at Short Contact Times
… modelled. In addition, catalysts coated with Rh-nanopowder produced by laser ablation is experimentally examined and compared with wet coated catalysts. Finally, the CPO of methane is carried in a Pt, presenting an even more well-defined configuration for modelling. At CH4/O2 ratios above 1.9 …
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