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Showing 1 to 20 of 24 for “"Nanopowders"”.
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Enhancement of fluidization and filtration using nanoparticle agglomerates and aerogels
… and the smoothness of the bed surface, with APF nanopowders showing a much more homogeneous fluidization and a much better dispersion than ABE nanopowders which are generally very difficult to fluidize and show vigorous bubbling. In the present work, the fluidization of APF as well as ABF …
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Toxicology of nanoparticles after cellular uptake
… carbon nanotubes (SWNTs), and zinc oxide (ZnO) nanopowders. A combination of cell viability assays—NR, MTT, LDH, live dead—and microscopy—TEM, SEM, confocal—was used. No direct interactions occurred with any of the assays except the NR and ZnO nanopowders at > 50 µg/mL. The overall cytotoxic …
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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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Calcium Phosphate Powders for Biomedical Applications: Synthesis, Thermal Behavior and Non-Conventional Sintering
… and to promote β-TCP formation directly. The nanopowders were conventionally sintered to produce dense (~90%) β-TCP with sub-micrometric gran size. Flash sintering was also carried out on the nanopowders, demonstrating that the flash event can occur only after CDHA→β-TCP reaction, since the …
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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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Production and characterisation of nanoparticulate silicon photovoltaic devices
… from the physical characterisation of the nanopowders and printed layers using optical and scanning electron microscopy, as well as an analysis of the electrical performance of the printed devices are also presented.
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Jet assisted fluidization of nanoparticle agglomerates
… the fluidization behavior of various APF and ABF nanopowders was studied and compared with the pure conventional fluidization mode. Generally, experiments were conducted to find the optimal operation of the jet by varying parameters such as, nozzle size, nozzle pressure, number of nozzles, …
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Processing of nano-sized boron carbide powder
… 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 powders to remove most of the B2O3 impurity usually present. XRD analysis of the powders verified the nanograined nature …
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Thermorheological properties of nanostructured dispersions
… It was observed that several of the fluids or nanopowders obtained from commercial manufacturers either contained no particles, had the presence of a relatively large proportion of water in ethylene glycol-based fluids, or were composed of particles with sizes far in excess of those claimed by …
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Geležies dalelių sintezė vandens ir alyvos terpėse ir jų taikymas tribosistemose /
… by introduction metallic and non-metallic nanopowders in lubricants and oils. The main objective relates with usage of magnetic nanoparticles in the friction space, possibilities to reduce friction or wear caused losses and treatment of surfaces damaged by microcracks. Moreover, the solid …
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Microwave plasma synthesis of nano-sized silicon carbide at atmospheric pressure
… mechanical properties of silicon carbide (SiC) nanopowders allow application across many areas, including high-power, high-frequency electronics and high-temperature technologies. Many different synthesis methods for the creation of SiC nanoparticles have been studied, including carbothermic …
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Assessment of the Wear Effects of Alumina-Nanofluids on Heat-Exchanger Materials
… on typical nanofluids (as 2%-volume of alumina nanopowders in 50/50 water/ethylene glycol solution, and in distilled water) which are jet-impinged (on aluminum and copper specimens) with 3.5 m/s to 15.5 m/s jet-speeds and in a 1 m/s parallel-flow (along the test specimen surface) during long …
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Deagglomeration and mixing via the rapid expansion of high pressure and supercritical suspensions
… This dissertation addresses the issue of mixing nanopowders constituents by deagglomerating them and achieving simultaneous mixing so that even after inevitable reagglomeration, the effectiveness of large interfacial surface area may be preserved. Nano-particle mixtures were prepared using the …
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Calcium Phosphate Nanoparticle Synthesis and Manufacture using Microwave Processing for Biomedical Applications
… synthetic CaPs to non load-bearing applications. Nanopowders can be used to produce products with smaller grain sizes and thus improved mechanical properties.</p><p>Traditional CaP transfection often results in the formation of large aggregates due to subsequent crystal growth. As such, synthesis …
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Effect of polymorphic phase transformations within an alumina layer on the ignition of aluminum particles
… the established kinetics. Melting of aluminum nanopowders was studied by differential scanning calorimetry in argon environment. No correlation was found between the melting and oxidation. The developed aluminum ignition model describes ignition of a particle inserted in a hot oxygenated gas …
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Nichtwässrige Synthese und Bildungsmechanismus von Übergangsmetalloxid-Nanopartikeln = Nonaqueous synthesis of transition-metal oxide nanoparticles and their formation mechanism
… solvents. In ketones, also the synthesis of nanopowders of lead zirconate titanate (PZT) was achieved, which were initially amorphous but could be crystallized by calcination at moderate temperatures. Additionally, PZT films were prepared by simply casting a suspension of the powder onto Si …
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Oxidation kinetics of metallic powders
… kinetics is also established for aluminum nanopowders. It is shown that the oxidation mechanism established for micron sized aluminum remains valid for particles as small as 10 nm. Aluminum oxidation model is combined with a heat transfer model to describe ignition of aluminum particles …
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Characterization and modeling of nanocomposite thermoelectric materials system bismuth antimony telluride ((Biy̳Sb1̳-̳y̳)2̳Te3̳) as a function of temperature and magnetic field
… of the nanocomposites from the ball-milled nanopowders alone (XY21, XY146, XY144, GJ99, and 0%) are almost identical. Moreover, the addition of nanoinclusions prepared via melt spinning decreases the sample mass density somewhat.
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Nanocomposites as thermoelectric materials
… a simple bandgap measurement technique with nanopowders was developed based on the Fourier Transform Infrared Spectroscopy. This provided a convenient way to quickly check the bandgaps of various thermoelectric nanocomposites, which is also crucial for theoretical studies.
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Mixing of nanosize particles by magnetically assisted impaction techniques
… MAIM techniques may be used to achieve mixing of nanopowders at a desired HoM through adjusting the number of magnets and processing time; and its inherent advantages are its simplicity, an environmentally benign operation, and reduced cost as compared with wet mixing techniques.
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