Showing papers in "Powder Technology in 2011"

TL;DR: A review of the commonly used models for rolling resistance and a more general model is presented in this article, where the robustness of these models in reproducing rolling resistance effects arising from different physical situations was assessed by using several benchmarking test cases.

TL;DR: In this paper, the authors compared both viscous dissipation and plastic dissipation models for an inelastic sphere obliquely impacting a target wall for a range of normal coefficients of restitution.

TL;DR: In this article, the penetration of droplets into agglomerates was investigated as a function of viscosity and surface tension of the liquid, and the wetting rate was found to be in good agreement with the theoretical Washburn equation.

TL;DR: In this article, the mixing performance and flow behavior in a continuous powder mixer for a typical pharmaceutical mixture was investigated, and the relationship between different experimental parameters and mean residence time and mean centered variance was examined.

TL;DR: In this paper, a transient hot-wire apparatus was used to determine the stability and thermal conductivity of 10, 000, 1000, 5000, and 10,000-ppm nanofluid particles.

TL;DR: In this paper, a consolidating product based on nanoparticles of slaked lime (Ca(OH)2) dispersed in isopropyl alcohol was exposed under different relative humidities (RH), 33, 54, 75, and 90% during 7, 14, 21 and 28 days.

TL;DR: In this article, a simple solution route at low temperature was used to synthesize zinc oxide (ZnO) particles with various morphologies, and the results indicated a close relationship between the photocatalytic activity and the particle morphology and size.

TL;DR: In this paper, a solution containing metal nitrates and poly(vinyl pyrrolidone) (PVP) as a capping agent was used to stabilize the particles, and they were thermally treated at various temperatures from 623 to 823 K at which calcination occurred.

TL;DR: In this article, a multi-sphere as well as a polyhedral approach is investigated as a method of shape-approximation within the discrete element method and the two approaches are compared against each other using an ellipsoidal particle impacting on a flat wall as a reference scenario.

TL;DR: In this paper, the quality of dispersion is a crucial factor which determines the homogeneity and final mechanical properties of these composites, and the authors studied the mechanical mixing methods, viz. high energy and low energy ball millings, and compared them to a novel polyester binder-assisted (PBA) mixing method.

TL;DR: In this paper, a 2 5−− 1 fractional factorial statistical design was used to find adequate spray-drying operating conditions to produce Cascara sagrada powders with good flow, good compactability properties, high process yield, low moisture content, low hygroscopicity, and caking tendency.

TL;DR: In this paper, a sol-gel method using glucose and fructose as two organic additives was devised to synthesize zirconia nanoparticles, which produced some positive effect on the phase transition from tetragonal to monoclinic and played an important role in the morphology and crystallite size of the nanoparticles.

TL;DR: In this paper, it was shown that mannitol particles of different surface roughness can be prepared by spray drying at different outlet temperatures, providing the opportunity of tailoring the contact area respectively the interparticle interactions between the drug and the carrier.

TL;DR: In this paper, the authors synthesize copper oxide nanoparticles, which are then applied to prepare CuO-water nanofluid, using a spinning disk reactor (SDR).

TL;DR: In this article, a method for applying nano-sized silicon dioxide guest particles onto host pharmaceutical particles (a.k.a. "dry-coating" or "nanocoating") has been developed using conventional pharmaceutical processing equipment.

TL;DR: In this article, the influence of important process parameters on the ball motion pattern was assessed, namely speed ratio, ball filling ratio and friction conditions, the latter by applying different mill feeds.

TL;DR: In this paper, Cai et al. evaluated 25 different correlations for bubble size and seven different correlations of bubble rise velocity by comparing their predictions with data available from the open literature and quantified the performance of these correlations by calculating the squared difference between the correlation predictions and the experimental data.

TL;DR: In this article, the single phase flow field of a gas cyclone has been simulated with a finite volume RANS model and two LES approaches, one with finite volume and one with lattice-Boltzmann discretization.

TL;DR: In this article, the thermal decomposition of kaolinite was studied by differential thermogravimetry (DTG) technique under non-isothermal conditions, and the apparent activation energy and frequency factor for the dehydroxylation of kaolin was evaluated by Kissinger method.

TL;DR: In this paper, it was found that the ZnO nanotubes grew in the direction of the c-axis and the lattice parameter was smaller than conventional micron sized materials.

TL;DR: In this article, a novel sphere-like CuS hierarchical structures are fabricated by solvothermal approach without any surfactant and template, which are composed of tens to hundreds of well-arranged and self-assembled nanoplates with thickness of about 20nm.

TL;DR: In this paper, the increase of sinter bridges during caking of water-soluble amorphous particles is modelled through the known sinter equations and measured by carrying out experiments in a ring shear cell.

TL;DR: In this article, the explosion features of nicotinic acid dust in atmosphere of methane and air at different concentrations of either dust or gaseous fuel were studied and the authors defined five different regimes of the gas/dust/air mixture explosion in the plane dust concentration vs. fuel concentration.

TL;DR: Wang et al. as discussed by the authors proposed a method to solve the problem of energy-efficient energy management in China's National Natural Science Foundation of China (NNSCF) and National Petroleum Corporation (CNPC).

TL;DR: In this article, the synthesis and characterization of semiconducting nanoparticles via one-step, solid-state reaction in the presence of polyethylene glycol 400 has been described, which is not only a physical size reduction process in conventional grinding but also a chemical reaction that is mechanically activated at the nanoscale during grinding.

TL;DR: In this paper, a radial basis neural network (RBFNN) was used to predict the complex non-linear relationships between pressure drop and geometrical dimensions for cyclone separators.

TL;DR: In this paper, Nanocrystalline magnesium oxide with high surface area was prepared by a simple precipitation method using pluronic P123 triblock copolymer (Poly(ethylene glycol)-block, Poly(propylene glycol), Poly(methyl glycol)) as surfactant.

TL;DR: In this article, a variable pressure scanning electron microscopes (VPSEM), a transmission electron microscope (TEM), an energy dispersive X- ray analyser (EDX), X-ray diffraction (XRD) and Fourier transmission infrared spectroscopy (FT-IR) was used for characterisation of Anadara granosa and commercial calcium carbonate.

TL;DR: In this article, a detailed comparative analysis between classical analytical methods and discrete element method (DEM) is presented to predict the flow mechanisms associated with the deformation of granular material impacting a flat plate.