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 47 for “"dispersants"”.
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Nanoparticles for Oil Dispersants and Nano Tracers
… surface modified inorganic nanoparticles as oil dispersants and nanosensors were examined and their behaviors were investigated. Silica nanoparticles with hydrophilic poly(oligo(ethylene oxide) monomethyl ether methacrylate) (POEOMA) homopolymer brushes were tested as oil dispersants. These …
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Surface and Subsurface Application of Chemical Dispersants and Associated Ecosystem Impacts
<p>Chemical dispersants are applied to spilled oil in marine environments when other, less controversial, methods are not adequate for the incident. They are considered to be a response method as opposed to a direct cleanup method, with the intended goals of reducing risk of exposure to sensitive …
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Studies of the Evaluation of Solid Phase Dispersants in Polymer Blends
… copolymers of ethylene-styrene as solid phase dispersants (SPDs) were added to blends containing equal proportions of LDPE and PS. Since this composition represents the poorest balance of properties in this system, it has been found that the addition of SPDs generally increases yield strength, …
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Studies of adsorption and stabilization of silica suspensions using well-defined polymeric dispersants
Solutions of poly(2-ethyl-2-oxazoline) and poly(2-methyl-2-oxazoline) in water and several alcohols were characterized by light scattering and cloud point measurements. The second virial coefficients in water were found to decrease with increasing temperature, reflecting lower critical solution …
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INVESTIGATION OF SUCCINIMIDE DISPERSANTS AND THEIR INTERACTIONS USING REDUCED TOTAL OIL VOLUME LUBRICANT DEGRADATION
… variables. At the mid range speed-load point the dispersants were able to be discriminated. The tris-succiniinide gave the highest performance, whilst the mono-succinimide was the worst. There was also a significant difference observed between the primary tuiil secondary ZDDP groups. This is …
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Molecular Simulation Study of Oil Hydrocarbons, Dispersants and Other Organics in Atmospheric Air/Water Interfaces
… species (i.e. DOSS and Span 80) from Corexit dispersants at atmospheric air/water and air/seawater interfaces. All these compounds can significantly contribute to the formation of secondary organic aerosols (SOAs). Furthermore, our simulation work on IVOCs, SVOCs and Corexit surfactants, …
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The effect of polysaccharides and inorganic dispersants on the surface characteristics of talc and the effect on the flotation performance of a Merensky ore
This dissertation describes an investigation into the combined effect of polysaccharides and an inorganic dispersant on the surface characteristics of talc and how this relates to the flotation performance of Merensky ore. The rationale in investigating the talc changes are due to its naturally …
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Laboratory experiments on warm fog dissipation.
… materials and ionic surfactants as warm fog dispersants are covered in a brief survey of the literature. The fog chamber, equipment and experimental procedures used in this study are described in detail. Seeding agents utilized during these small-scale fog chamber experiments were limited to …
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Microchemical systems for understanding of multiphase flows in upstream hydrocarbon and natural gas productions
… multiphase flows in the presence of model dispersants were studied for We < 1. Introducing dispersants at varying dimensionless volumetric injection rates, ranging from 0.001 to 0.01, transitions from stable slug flow to the bubbly regime. Dimensionless mass ratios of three model …
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Adsorption/Desorption Process of Stimuli-Responsive Polymers on Simulated Natural Surfaces Using QCM-D & AFM Analysis
… threat to the environment and wildlife. Though dispersants are commonly used to combat oil spills in the hope of using them to mitigate the effects of oil on land and wildlife, the challenge of preventing redeposition of the oil onto these substrates still exists, and there are concerns with the …
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Assessment of nanocomposites vs. amorphous solid dispersions for dissolution enhancement of bcs class ii drugs
… (2) elucidate the impact of various classes dispersants on drug release rate and mechanisms during the redispersion-dissolution of nanocomposites prepared via dying of the drug nanosuspensions, and (3) assess the dissolution enhancement imparted by drug nanocomposites vs. ASDs prepared via …
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An Evaluation of the Effects of Marine Oil-spills, Remediation Strategies, and Shipwrecks on Microbial Community Structure and Succession
… to oil-contamination, and the application of dispersants and biosurfactants, in North Sea seawater microcosms is the focus of Chapter Two. Analysis revealed that dispersants and biosurfactants, which significantly reduced the interfacial tension between oil and water, significantly increased …
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PLASMA SPECTROCHEMICAL ANALYSIS OF SLURRIES
… time depended upon sample hardness. Suitable dispersants were identified. Laser diffraction measurements showed the modification of aerosol distributions, for solutions and slurries, by the spray chamber and injector. Few aerosol particles over 18 µm, and solid particles over 6 to 8 µm, size …
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Molecular Dynamics of Interfacial Phenomena at Air/ice, Air/water, and Air/salt Water Interfaces
… with 17-31 carbon atoms), surfactants and dispersants at air/salt water interfaces. These simulations are relevant to understand the fate of these compounds during the recent 2010 Deepwater Horizon (DWH) oil spill. The adsorption of gas-phase aromatics (benzene, naphthalene and …
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The influence of multi-walled carbon nanotubes on the properties of polypropylene nanocomposite. The enhancement of dispersion and alignment of multiwalled carbon nanotube in polypropylene nanocomposite and its effect on the mechanical, thermal, rheological and electrical properties.
… prepared by conventional twin screw extrusion. Dispersants and compatibilisers were used to establish good interaction between filler and polymer. Several different extruder screw configurations were designed and the properties of PP/MCNT composite prepared by each configuration investigated. …
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Laboratory studies of the biodegradation of chemically dispersed oil: effect of droplet size and nutrient amendment
… on the shorelines, and for this reason, chemical dispersants are commonly used to disperse the oil slick in the water column, preventing it from reaching the shorelines. However, the long term fate of dispersed oil depends on its biodegradation by indigenous microorganisms, which in turn depends …
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Investigating the redispersibility of calcium carbonate
… slurry product, Carbilux, after drying. Various dispersants and pH changes were made to improve the colloidal stability. The commercial product contained an unknown organic dispersant which was removed by washing and zeta potential results were measured. The rheological properties of the various …
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Modeling and Characterization of Rate Phenomena in Complex Electrochemical Systems: Sodium-Metal Chloride Batteries and Ni/SiC Co-Deposition
… for wear-resistant coatings is that the dispersants that are used to stabilize the particles in the electrolyte to ensure high and uniform particle incorporation into the deposit can significantly affect the electrodeposition kinetics. To overcome this challenge, studies of particle …
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Deepwater Horizon Impacts on the Diet, Growth, and Condition of Larval Spanish Mackerel (<i>Scomberomerus maculatus</i>)
… web caused by the release of oil and chemical dispersants during the DWHOS event. Using samples from a long-term ichthyoplankton survey off the coast of Alabama, I sought to resolve the effects of the DWHOS on larval fishes. I compared the condition, growth, and diet of larval Spanish Mackerel …
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A bioengineered approach for sustainable crude oil pollution treatment via entrapment, dispersal and removal using Nano-CarboScavenger
… inefficient or involve highly toxic chemical dispersants. In this work we adopt a commercially-amenable nanotechnology based approach to design tunable, biodegradable particles for efficient and safe petroleum remediation. Exhaustively characterized 100 nm sized hybrid dual-shelled polymeric …
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