Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 59 for “"Particle Morphology"”.
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Advancing Cold Spray for Additive Manufacturing: A Study on Particle Morphology, Gas Nature, and Particle Preheating
… and conclusion. The effect of a non-spherical particle morphology was the first objective investigated. Titanium has been shown repeatedly to require pure helium at very high temperatures and pressures to get dense coatings, however, the unique coral-like morphology resulting from the Armstrong …
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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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Synthesis and characterization of novel polymer-ceramic nanocomposites: Organoceramics
… during crystallization often leads to changes in particle morphology, and in some cases intercalation.
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Morphology and polymorphism of TiO2 nanoparticles prepared in premixed stagnation flames
This thesis investigates the morphology and polymorphism of TiO$_2$ nanoparticles prepared in premixed stagnation flames in order to understand the factors controlling the formation of the particles. Computational models are developed and experimental measurements are performed to characterise the …
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Chemo-elastic behavior of reconstructed Li-ion battery cathode particles with phase transformation: a numerical and analytical investigation
… Li[subscript x]CoO[subscript 2] cathode particles has been elucidated with the implementation of an isothermal microscale numerical and analytical solution. The electrode stress-strain state is delineated upon the contribution of: i) phase transformation; ii) anisotropy and …
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Formation of uniform particles: Morphology and colloidal stability, and stable particle growth during precipitation from titanium alkoxides
The mechanisms of formation of uniform particles from hydrolysis and condensation of titanium alkoxides are investigated. Evidence is presented suggesting two separate processes are determining the success of precipitating uniform particles: generating and maintaining a stable suspension throughout …
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Sonoelectrochemical synthesis of submicron metal powders
… is a widely used technique for producing nanoparticles. In this technique, alternating pulses of electric current and power ultrasound are applied to an electrochemical cell to create and suspend particles in the electrolyte. The pulsed technique largely separates the particle morphology …
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Improving Evaporative Light Scattering Detector performance using Experiments and Modelling
… intensity). This study investigates the particle morphology and size distribution of analytes dried through an ELSD by employing multiple particle sizing techniques, including the Phase Doppler Particle Analyzer (PDPA), the Aerodynamic Aerosol Classifier (AAC), and the Scanning Mobility …
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Linking morphology and reactivity: growth and ligand-assisted dissolution of cobalt oxyhydroxide.
… amount of control can be exerted over the final particle morphology by altering simple factors such as reaction temperature or choice of oxidizing agent. The ligand-assisted dissolution of heterogenite by IDA produces a mixture of sfac and u-fac isomers of Co(IDA)2 –, and the relative amount of …
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Nucleation in emulsion polymerization : steps towards a non-micellar nucleation theory
… than 70 years, understanding of the mechanism of particle nucleation in emulsion polymerization has been one of the most challenging issues in heterophase polymerization research. Within this work a comprehensive experimental study of particle nucleation in emulsion polymerization of styrene at 70 …
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The Rheology of Anionic Aqueous Polyurethane Dispersions
… is aqueous polyurethane. Aqueous polyurethane particles have a very unique structure, which lies somewhere between that of polymer chains and traditional colloidal particles. In this fundamental study, we attempt to characterize and understand the flow behavior of these unique electrostatically …
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Eu3+ pakeistų Y3Ga5O12 granatų sintezė ir liuminescencinių savybių tyrimas /
… FE-SEM Hitachi SU-70 give information about particle morphology, size and formation of agglomerates. Using Edinburgh Instruments FLS980 spectrometer excitation, emission and decay time spectra were recorded in UV/VIS range. For thermal quenching (TQ) measurements had been applied to the …
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Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy
Incorporation of silver nanoparticles (AgNPs) into an increasing number of consumer products has led to concern over the potential ecological impacts of their unintended release to the environment. Dissolution is an important environmental transformation that affects the form and concentration of …
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Mg-Al Layered Double Hydroxide: A Potential Nanofiller and Flame-Retardant for Polyethylene
… electron microscopic analysis show a complex LDH particle morphology with hierarchy of particle size and shape starting from exfoliated particles fragments to particle aggregates over few hundred nm size. The exfoliated LDH platelets are distributed both in the vicinity of large particles and also …
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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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Nonaqueous synthesis of metal oxide nanoparticles and their assembly into mesoporous materials
… interesting crystalline metal oxide nanoparticles via nonaqueous sol-gel process and the formation of mesoporous metal oxides using some of these nanoparticles as building blocks via evaporation induced self-assembly (EISA) technique. In the first part, the experimental procedures and …
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Evaluating the Effect of Composition, Structure and Functionality on Atmospheric CO2 Adsorption in Porous Solid Sorbents
… we investigate the effects of synthesis scale, particle morphology, and chemical functionality on CO2 capture performance for solid adsorbents. Metal-organic frameworks (MOFs), activated carbon, and cellulose aerogels are investigated in both single-gas static conditions, and mixed-gas dynamic …
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Occurrances and distribution of some tobacco viruses in Southern,Central and Lusaka provinces in Zambia
… against antisera from Agdia Inc.,USA.Virus particle morphology was also studied in some cases by electron microscopy. The results indicated that at least four viruses-tobacco mosaic(TMV),potato virus Y(PVY),alfalfa mosaic(AMV) and tobacco ringspot(TRSV)occur in tobacco in Zambia. Tobacco …
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Occurrances and distribution of some tobacco viruses in Southern,Central and Lusaka provinces in Zambia
… against antisera from Agdia Inc.,USA.Virus particle morphology was also studied in some cases by electron microscopy. The results indicated that at least four viruses-tobacco mosaic(TMV),potato virus Y(PVY),alfalfa mosaic(AMV) and tobacco ringspot(TRSV)occur in tobacco in Zambia. Tobacco …
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Grain Boundary Pinning Approach for Manufacturing High-Strength Nanocrystalline Aluminum Alloys
… were characterized to determine the changes in particle morphology, elemental composition, and crystallite size. The results showed changes in the morphology of powders and a reduction in crystallite size with the increase in cryomilling duration. Thereafter, the bulk samples using cryomilled …
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