Showing papers in "Powder Technology in 2012"

TL;DR: In this article, the electrical conductivity of different carbon materials (multi-walled carbon nanotubes, graphene, carbon black and graphite), widely used as fillers in polymeric matrices, was studied using compacts produced by a paper preparation process and by powder compression.

TL;DR: In this paper, the authors estimate the coefficient of rolling friction for simplified shapes using a simple geometric argument based on the eccentricity of contact, which was tested by running a series of back-to-back simulations of a simple angle of repose test with clumped particles (simulating shape) and idealised spherical particles with rolling friction.

TL;DR: In this article, the utilization of the zinc oxide nanoparticles (ZnO) as an adsorbent for the removal of Zn(II), Cd(II) and Hg(II)) ions from aqueous solution was investigated.

TL;DR: The MFIX-DEM as discussed by the authors software can be used for simulating the gas-solids flow using an Eulerian reference frame for the continuum fluid and a Lagrangian discrete framework (Discrete Element Method) for the particles.

TL;DR: In this article, three measurement techniques can be used to measure the physical properties of a powder: the static properties of the powder are analyzed through the shape of a heap, the quasi-static behavior is studied with the analysis of the compaction dynamics, and the dynamical regime is monitored through the flow in a rotating drum.

TL;DR: In this article, nano-sized CuO, Co 3 O 4 and CuCo 2 O 4 powders were prepared via different methods such as co-precipitation, thermal decomposition of oxalate precursor and sol-gel and their catalytic activities towards thermal deformation of ammonium perchlorate.

TL;DR: In this paper, the effect of particle size, pressure and temperature at which pressure is applied on the SPS mechanism of particle rearrangement, localized deformation, bulk deformation and neck growth was investigated.

TL;DR: In this paper, the effect of parameters such as the crystallite size, amount of catalyst, concentration of the dye, pH and irradiation on photocatalytic degradation of rhodamine B (RB) dye was studied.

TL;DR: In this article, the authors compared the performance of silver and palladium nanoparticles loaded on activated carbon for the removal of methylene blue (MB) molecules from aqueous solutions and found that both adsorbents due to their high MB adsorption capacity in short equilibrium times are good alternative as low-cost sorbent in wastewater treatments.

TL;DR: In this paper, a bimetallic oxide adsorbent was synthesized by the co-precipitation of Fe(II) and Ti(IV) sulfate solution using ammonia titration at room temperature.

TL;DR: In this paper, a review traces current applications of the residence time theory in various solid unit operations, and some common modeling and tracer detection techniques applied in continuous flow systems are also considered.

TL;DR: The most commonly described approach in open literature to achieve hydrodynamic and reactive similarity in two fluidized beds is to use sets of dimensionless numbers which have to be kept constant at both scales as mentioned in this paper.

TL;DR: The use of porous silica microshells (microparticles) generated from fossilised diatoms known as diatomite or diatomaceous earth (DE) as a natural drug carrier for drug delivery application is presented in this article.

TL;DR: In this paper, a white ash, containing majority of SiO2 with trace amounts of Al2O3, CaO, MgO, K2O, P2O5, etc., was successfully produced by heating rice straw at 10°C/min and holding at 250, 325 and 575°C to facilitate decomposition and gasification of organics while avoiding auto-ignition.

TL;DR: In this paper, a novel variant of Discrete Element Method (DEM) is proposed to simulate the flow dynamics of granular material made of non-spherical particles, which is limited to particles of convex shape but permits to consider any combination of shape and size.

TL;DR: In this article, the photocatalytic oxidation and mineralization of petroleum refinery wastewater in aqueous catalyst suspensions of titanium dioxide (TiO2), Degussa P25 (80% anatase, 20% rutile), were conducted based on a central composite design (CCD) and analyzed using response surface methodology (RSM).

TL;DR: In this paper, composited catalysts (CSAC/TiO2) are better than naked CSAC or naked TiO2 only, and the advantages of the CT-2 catalyst revealed its practical potential to treat pollutants.

TL;DR: In this article, a multi-objective optimization study of the gas cyclone separator is performed, where two radial basis function neural networks (RBFNNs) are developed and employed to model the pressure drop and the cut-off diameter for cyclone separation.

TL;DR: In this article, the authors proposed the use of Scanning Electron Microscopy (SEM) and ImageJ processing program in order to evaluate the morphology of the particles and measure the particle size and size distribution of sanding airborne dust from seven diverse soft-, hard- and tropical hardwood.

TL;DR: In this article, a mixture of ethanol and water under visible light irradiation (λ < 400 nm) was used to detect the H2 evolution rate from water, and the average maximum H 2 evolution rate was 361.64μmol·h−1·gcat−−1 (with a measured time of 6h).

TL;DR: In this paper, the effects of activation time, activation temperature, and impregnation ratio on the yield and iodine number of activated carbons from date stones by activation with ferric chloride (FAC) and commonly used zinc chloride (ZAC) has been investigated.

TL;DR: In this article, the stability and agglomeration state of silica nanofluids were obtained by dispersing the nanoparticles in distilled water using an ultrasonic probe, which has proved to be the most effective system and gives the best results when compared with previous works.

TL;DR: In this paper, the explosion characteristics of H2/CH4/air and CH4/coal dust/air mixtures as well as the solid explosion products were investigated using a standard 20L explosion spherical vessel.

TL;DR: In this paper, the effect of increasing particle angularity on the flow properties is investigated in 3D DEM-simulations of hopper discharge using non-cohesive, monodisperse spherical and polyhedral particles as well as particle shapes generated by the multi-sphere method.

TL;DR: In this article, a self emulsifying powder (SEP) formulation of poorly soluble lercanidipine hydrochloride (LCH) was used to improve the solubility of LCH.

TL;DR: In this article, a planetary ball mill was used to increase the surface area of the biochar, and various milling parameters were examined to see which had the largest effect on surface area.

TL;DR: In this article, the effect of the properties of the granulation liquid, i.e. viscosity (amount of binder) and surface tension on residence time, torque and granule properties such as size, shape, structure, strength and flowability was studied in a co-rotating twin screw granulator.

TL;DR: In this article, Nanocrystalline Ag-doped ZnO powders were synthesized directly from an aqueous solution of zinc acetate dihydrate and silver nitrate in the presence of poly(ethylene oxide)- b -poly(propylene oxide), (PEO) 19 - b -(PPO) 3, and sodium hydroxide at 70°C.

TL;DR: In this paper, the spatial distribution of particle-wall interaction force was calculated and corresponded to the wear pattern in the elbow, the puncture point locations have been observed, in particular, the influences of slurry velocity, bend orientation and angle of elbow on the point location were discussed, and a fluid density-based buoyancy model was adopted to calculate the solid-fluid interaction force.

TL;DR: Nickel nanoparticles are prepared successfully through reducing nickel chloride by hydrazine hydrate and are tested as supercapacitor electrode material for the first time as mentioned in this paper, and the as-prepared nickel nanoparticles were characterized intensively by a variety of means such as SEM, TEM, XRD and XPS.