Showing papers in "Powder Technology in 2010"

TL;DR: In this article, the initial pH values and reaction temperatures both played important roles in the morphology of hydroxyapatite, as well as the phase formation and degree of crystallinity.

TL;DR: In this paper, the authors investigated the influence of the solid-phase wall boundary condition in Eulerian-Eulerian numerical simulations of a bubbling fluidized bed and found that the wall effect plays an important role in CFD models.

TL;DR: In this paper, the authors investigated whether the use of a representative elementary volume (REV) for porosity can be used as a REV for other parameters such as particle size distribution, local void ratio and coordination number.

TL;DR: In this paper, a low-temperature green chemical synthesis of various morphologies of copper nano/microstructures was described, which achieved high yields in aqueous solution using ascorbic acid as a reductant and the cationic surfactant cetyltrimethylammonium bromide (CTAB) as capping agent.

TL;DR: In this paper, a compound control scheme, consisting of a feedforward compensation part based on DOB and a feedback regulation component based on model predictive control (DOB-MPC), is developed.

TL;DR: In this article, stable ethylene glycol-based copper nanofluids were prepared through a two-step method, using polyvinyl pyrrolidone as dispersant.

TL;DR: In this article, a virtual 3D geometries resembling the internal microstructure of electrospun fibrous materials are generated to simulate the pressure drop and collection efficiency of nanofibrous media when challenged with aerosol particles in the size range of 25 to 1000nm.

TL;DR: In this paper, the effects of calcination temperatures for the precursors, calcination time, feed concentrations, and feed flow rates on the crystal sizes of ZnO nanoparticles were investigated.

TL;DR: In this paper, the authors performed numerical simulations of dry and wet granular flow inside a four-bladed mixer using the discrete element method (DEM) and a capillary force model was incorporated to mimic the complex effects of pendular liquid bridges on particle flow.

TL;DR: In this article, a growth model was proposed for the selective formation of CuS hierarchical structures, and the optical properties of the hierarchical structures were investigated by ultraviolet-visible spectroscopy and photoluminescence spectrographs.

TL;DR: In this article, high-speed video imaging of particle clusters in and above a fluidized bed suggests that clustering is significant for FCC catalyst and polyethylene powders, and the dominant mechanism for clusters in the freeboard appears to be cluster formation in the bed.

TL;DR: A critical review of available methodology for dealing with the motion of non-spherical particles at higher Reynolds numbers in the Eulerian-Lagrangian methodology for dispersed flow is given in this paper.

TL;DR: In this paper, the influence of particle size distribution on the rheological properties of 316-L stainless steel feedstocks is presented, where two kinds of gas-atomized powders were employed with d90 of 8 and 26-μm of particle sizes.

TL;DR: In this paper, the minimum flow properties required for successful tableting on a high speed tablet press are identified by identifying a powder that exhibits minimally acceptable flow properties on a tablet press.

TL;DR: In this paper, a correction coefficient was introduced in the calculation of the particle-particle contact radius between colliding particles to overcome the sensitivity of heat transfer to particleparticle contacts.

TL;DR: In this article, a planetary ball mill was used to mechanically prepare nano powder of natural clinoptilolite zeolite by using statistical experimental design to optimize wet and dry milling conditions with respect to final product crystallinity, particle size and distribution.

TL;DR: In this article, the central composite rotatable design (CCRD) model was used to optimize formulations of dihydroartemisinin nancistructured lipid carrier (DHA-NLC).

TL;DR: A feasibility study on recovering silicon powder from slurry containing silicon carbide abrasives, silicon kerfs, and iron fragments generated by slicing silicon ingots in the wire-saw process was conducted as discussed by the authors.

TL;DR: In this paper, cogrinding method was used as an approach to prepare gliclazide coground/solid dispersions (SDs) in the carriers such as povidone (PVP-K30), crospividone and microcrystalline cellulose (Avicel PH 101) with different drug to carrier ratios.

TL;DR: In this article, a simulation of commercial-scale two-stage upflow and single-stage downflow entrained-flow gasifiers was conducted to study effects of simulating both the coal particle density and size variations.

TL;DR: ZnO particles were synthesized directly from an aqueous solution of zinc acetate dihydrate in the presence of sodium dodecyl sulfate (SDS) and sodium hydroxide at 70°C as mentioned in this paper.

TL;DR: In this article, a thermal decomposition of titanium tetraisopropoxide (TTIP) was carried out experimentally using a tubular electric furnace at various synthesis temperatures and TTIP heating temperatures.

TL;DR: In this article, a first-principles electrostatic model is developed and coupled with a multi-fluid computational fluid dynamic (CFD) model to understand the effect of electrostatics on the bulk polymer, polymer fines, and catalyst particles.

TL;DR: In this article, the relationship between the components of powders, namely, the powder surface morphology, the flow characteristics and the compressibility of low-energy and high-energy ball milled powders of Al 6061 alloy reinforced with TiO2 particles was investigated by using the scanning electron microscope (SEM).

TL;DR: In this article, the rheological behavior of fly ash samples collected from a thermal power plant has been investigated over a range of volumetric solids concentration in shear rate range of 10−200 s−1.

TL;DR: In this paper, the effect of feed frames, a device used in rotary tablet presses to drive the powders into compression dies, on the properties of the powder entering the tablet press dies was studied.

TL;DR: In this paper, the authors used the CPFD numerical scheme to predict the ozone decomposition in a bubbling bed using the Eulerian-Lagrangian solution method for fluid-solid flows.

TL;DR: In this article, the authors investigated the dehydroxylation of medium ordered kaolinite under non-isothermal conditions and showed that the rate of third-order reaction (F3) is controlled by the applied condition.

TL;DR: In this article, the effects of synthetic conditions on particle sizes and magnetic properties were investigated by TEM, XRD, and VSM, and the results showed that the concentrations of metal ions were the key factors not only on the particle size of NiFe2O4 but also on their magnetic properties.

TL;DR: In this paper, the effect of sintering temperature on the density and porosity of dry pressed diatomite green bodies was evaluated using mercury porosimetry and water immersionmeasurements.