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 21 for “"Submicron Particles"”.
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Formation of inorganic submicron particles under simulated pulverized coal combustion conditions
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1982.
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Magnetophoretic focusing on submicron particles dispersed in a polymer-stabilized magnetic fluid
Magnetophoresis is the migration of particles upon the application of an inhomogeneous magnetic field. The overall goal of this work was to investigate the magnetophoretic focusing of non-magnetic particles suspended in magnetic fluids, which are colloidal suspensions of nano-sized magnetic …
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Forces and Stability in Ternary Colloidal Systems: Evidence of Synergistic Effects
… and controlling the forces between colloidal particles in solution, along with the resulting stability of a dispersion of such particles, continues to be at topic of great interest. Although most laboratory studies focus on model systems in which the number of system species is kept to a …
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Supercritical fluid spray processes for microencapsulation and formation of submicron aqueous dispersions of pharmaceutical compounds
… fluids that are capable of producing submicron particles. Novel variations of these basic processes have been examined to produce stable particles of various pharmaceutical compounds. PCA is an antisolvent precipitation technique where an organic solution of drug + polymer in solvent …
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A Study of the Intermediate-Range Transport of Secondary Acidic Species
… and calibration of an instrument to separate submicron atmospheric particles, (2) Field sampling and chemical analyses of submicron particles to obtain elemental and ionic concentrations, (3) Determination of a tracer for coal-fired power plants by factor analysis of the chemical data, and (4) …
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The role of aqueous-phase oxidation in the formation of highly-oxidized organic aerosol
… phase, such as oxidation within aqueous particles. The focus of the remainder of the thesis involves experiments designed to study this third pathway. To examine the importance of the formation of highly oxidized OA in the aqueous phase (wet particles or cloud droplets), I investigate …
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The synthesis, stabilization and sintering of high performance semicrystalline polymeric powders
… dispersion, preferably of small uniform particles. Formation of submicron particles from poly(ether ether ketone) (PEEK) for use in aqueous dispersion prepregging was demonstrated. The procedure involved synthesis 4,4'-difluoro (N-benzohydroxylidene aniline) followed by the step …
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Dynamic Light Scattering for the Characterization of Polydisperse Fractal Systems by the Example of Pyrogenic Silica
… light scattering (DLS) is a method to size submicron particles by measuring their thermal motion (diffusion) in suspensions and emulsions. However, the validity of the Stokes-Einstein equation that relates the diffusion coefficient and the particle size is limited to spherical particles and …
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INVESTIGATING THE CONTRIBUTION OF MARINE VIRUSES TO OPTICAL BACKSCATTER IN THE <0.2 µM FRACTION OF SEAWATER
… (IOP) of seawater, specifically backscatter. All particles produce backscatter, with their contribution dependent on particle size, concentration, and composition. Living particles contribute 10-20% of the total backscatter with the remaining 80% of unclassified backscatter, “missing backscatter”, …
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Continuous dielectrophoretic separation of colloidal particles
… composition remains the same with only the particles being separated. On the microscale, DEP has been used to separate viable and non-viable cells, and cells with different dielectric properties, with the aid of a range of miniaturised, microfabricated devices. However, DEP at the nano-scale …
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Integrated optic/nanofluidic detection device with plasmonic readout
… excitation as well as the capability to excite submicron particles. A demonstrated excitation spot of 200nm is the best we have seen in this type of device. Further work is suggested that can improve this resolution further.
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Aqueous poly(arylene ether ether ketone) suspensions
… This thesis describes the preparation of submicron diameter poly(arylene ether ether ketone) suspensions in water, and analysis of suspension stability as a function of the suspension variables. This thesis focuses on developing the procedures, and defining the parameters, for preparing …
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Experimental study of electrostatic aerosol filtration at moderate filter face velocity
… due to its ability to efficiently collect submicron particles while maintaining a low pressure drop. Filter face velocities have ranged from 0.01-0.5 m/s in previous studies. However, in this study, measurements were conducted from 0.5-2.5 m/s, a region where Reynolds numbers range from …
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Form, function and flow in the plankton : jet propulsion and filtration by pelagic tunicates
… oceanic particle size concentrations showed that submicron particles are encountered at higher rates than larger particles. Results from feeding experiments with 0.5, 1 and 3 μm polystyrene microspheres corroborated model predictions. Though 1 to 10 μm-sized particles (e.g. flagellates, small …
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Reentrainment of Submicron Solid Particles
… temperature on the short-term reentrainment of submicron particles. The particles tested are in the size range of 10-900 nm and are deposited by wetting the inside of capillary tubes with a liquid suspension. The tubes are then dried in a desiccator. The particles are reentrained under turbulent …
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Diffusing wave spectroscopy applied to material analysis and process control
… studied as a method of laboratory analysis of submicron particles, and developed as a prospective in-line, industrial, process control sensor, capable of near real-time feedback. No sample pre-treatment was required and measurement was via a noninvasive, flexible, dip in probe. …
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Enhancement of fluidization and filtration using nanoparticle agglomerates and aerogels
… have classified the fluidization behavior of nanoparticles as Agglomerate Particulate Fluidization (APF) and Agglomerate Bubbling Fluidization (ABE). These fluidization behaviors are quite different in regard to the fluidized bed expansion, the presence of bubbles and the smoothness of the bed …
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The aging of organic aerosol in the atmosphere : chemical transformations by heterogeneous oxidation
… (C4H1 00 4 ) and levoglucosan (C6H1 00 5) particles by hydroxyl radical (OH) was studied first in order to evaluate the effects of atmospheric aging on the mass and chemical composition of atmospheric organic aerosol, particularly that resembling fresh secondary organic aerosol (SOA) and …
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Sources and Biochemical Composition of Detrital Organic Matter In theSea
… matter (POM) and is an important source of submicron particles and colloids in the ocean. Peptidoglycan was a substantial component of POM but not of dissolved organic matter (DOM). Compositional differences between POM and DOM primarily reflected the selective incorporation of specific …
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Synthesis and Characterization of Multi-Functional Nanoparticles for Therapeutic and Biosensing Applications
… protein hormone release from biodegradable nanoparticles prepared using double emulsion solvent evaporation was quantified and release phases were identified. Insulin-like growth factor (IGF1)-loaded nanoparticles showed that the released protein was able to stimulate an important pathway for …
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