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Showing 1 to 20 of 111 for “"Particle shape"”.
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Effects of particle shape and flexibility on suspension dynamics
Particles suspended in a Newtonian fluid may lead to non-Newtonian behaviour, depending on their shape and flexibility. Particles can now be precisely engineered from linked, double-stranded DNA sequences or rods. To design functional nano-materials from these systems, it is important to predict …
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Particle shape optimization in colloidal clusters for structural colour applications
… using colloidal clusters formed of spherical particles in both experiment and simulation. As compared to pigment based colour, structural colour is more robust to degradation and has the potential for multifunctional benefits. Here we apply digital alchemy, an inverse design technique for …
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The effects of particle shape, size, and interaction on colloidal glasses and gels
… emulsion polymerization reactions, colloid particles of tunable shape are synthesized from polystyrene. In all, four particle shapes are studied referred to as spheres (S), heteronuclear dicolloids (hDC), symmetric homonuclear dicolloids (sDC), and tricolloids (TC). Two size ranges of …
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Particle shape anisotropy and its effects in AlNiCo and Fe-Cr-Co magnet alloys.
… which initially produces an homogeneous, fine shape-anisotropic particle microstructure, and by subsequent diffusion during heat treatment achieves a highly ferromagnetic state; all of which are necessary conditions for good permanent magnet properties. The results indicates that some …
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Particle shape corrections to Twersky's formalism for multiple scattering in a random particulate medium
… since the wavelength reduces to the size of a particle. The purpose of this thesis is to augment the Twersky theory of multiple scattering in a random particulate medium. Most applications of Twersky’s work use a far-field approximation and a point-particle assumption. At high frequencies, …
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An emperical study of diffusion: The role of particle size, particle shape, gravity, and edge effects
… examined milk fat globules and Cabosil particles in colloidal suspensions under a microscope, following their trajectory for 10 seconds. A flow model was developed to determine the diffusion coefficients. Drag coefficients revealed the geometry is correlated with the diffusion …
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The development and demonstration of a practical methodology for fine particle shape characterisation in minerals processing
… These models do not currently incorporate particle shape, which, although rarely quantified, is known to affect numerous unit operations. Automated Scanning Electron Microscopy (Auto-SEM-EDS) is a widely used tool for mineralogical analysis. It also provides an opportunity for simple, …
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Bedload transport: the effects of particle shape and an investigation of a wide range of transport rates
The effects of particle shape on bedload transport and a wide range of bedload transport rates using both bed subsurface and surface layer based approaches are investigated using fractional transport analysis with a similarity approach. Bedload transport data from a stream containing flat, low …
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From individual to collective motion of self-propelled particles: The role of particle shape, orientational ordering and clustering
Diese Arbeit untersucht das Verhalten von aktiven getriebenen Teilchen, d. h. Teilchen, die sich unter Verbrauch von Energie gerichtet mit einer gegebenen Geschwindigkeit fortbewegen. Solche Teilchen sind per Definition fernab vom thermodynamischen Gleichgewicht und unterliegen daher nicht dem …
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Crystallization of calcium sulphate during phosphoric acid production : improving filtration through improvement in particle shape and size distribution
… sulfate crystals (gypsum) precipitates and its shape and size distribution are key factors in determining the downstream filtration efficiency. Particularly, the metal ion impurities coming from raw phosphate rock play an important role as shape modifiers. The presence of impurities in the acid …
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Electrochemical Oxidation of Individual Silver Nanoparticles: Exploring the Effect of Particle Shape, Capping Ligand, Electrolyte, and Potential on the Signal
… unique properties can be exploited, and nanoparticles are being used as catalysts, antimicrobials, drug delivery vehicles, sensors, and more. However, the fundamental properties of nanomaterials and their interactions with their surrounding environments are still poorly understood. In this …
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The morphological, flow and failure characteristics of fractionated natural bulk material. Evaluation of flowability of fractionated powdered liquorice using a specially designed flowmeter. The particle morphology was assessed by computer image analysis and the failure properties by shear cell testing.
… into 23 narrow size fractions to investigate the particle and bulk characteristics of the material, and to study the influence of particle shape on powder flowability. The morphology of the fibrous particulate was investigated by using a Quantimet 720 Image Analyser. The perimeter (P), projected …
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Study of Fluid Forces and Heat Transfer on Non-spherical Particles in Assembly Using Particle Resolved Simulation
… Most of the studies have focused on spherical particle shapes, however, in most natural and industrial processes, the particle shape is seldom spherical. In fact, particle shape is one of the important parameters that can have a significant impact on momentum, heat and mass transfer, which are …
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Evaluation of triple-frequency radar retrieval of snowfall properties using coincident airborne in-situ observations during olympex
Particle scattering models have shown that aggregates and spherical particles occupy distinct regions of the Ku-Ka-W-band Dual-Frequency Ratio (DFR) plane. Furthermore, ground-based observations suggest that particle bulk density and characteristic size can be retrieved from the DFR plane. This is …
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Investigation of the flotation behaviour of ball mill and IsaMill products
… uses the differences in surface properties of particles to separate hydrophobic particles from hydrophilic ones. The strong relationship between the method of crushing the rocks and the amount of valuable minerals which can be reclaimed from the crushed rock has long been realized in mineral …
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Physicochemical and computational approaches for the prediction of the manufacturability of active pharmaceutical ingredients
… and deformation properties of APIs. Four diverse particle shapes of ibuprofen, with similar physicochemical properties are reported herein and a correlation between particle shape and sticking propensity established. Ibuprofen particles with a regular particle shape exhibit a greater tendency to …
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An algebraic reconstruction technique (ART) for the synthesis of three-dimensional models of particle aggregates from projective representations
… granular materials is significantly dependent on particle morphology. However, quantification of this dependence is a challenging task owing to a dearth of quantitative models for describing particle shape and the difficulty of modeling angular particle assemblies. The situation becomes more …
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Geometry-Dependent Fracture and Rebound of Particulate under Compressor-Relevant Impact Conditions
… to damage when they ingest small solid particles like sand, dust, or volcanic ash. Once inside, these particles collide with engine blades at very high speeds, where they may bounce, stick, or break apart. Each of these outcomes affects how particles travel through the engine and, in …
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Influence of some particle characteristics on the small strain response of granular materials
… in the literature showing the influence of particle characteristics on the small strain response of geomaterials.<br/>In this research the effects of some particle characteristics such as particle size and particle shape on the small strain response of soils are investigated. Granular …
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Investigation of the effects of colloidal suspension properties on spatially resolved diffuse reflectance
… by the physical properties of constituting particles. The influence has not been explored fully as the chemical characteristics (composition/concentration) are of primary concern. Particle size distribution provides with detailed characteristics of the material population, however, it is a …
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