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 93 for “"silica particles"”.
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Surface forces during electrophoretic assembly of micron scale silica particles
… patterning and used to manipulate 1.58 [mu]m silica particles in-plane. A digital video system was used to image the motion of particles far from the electrodes and their deposition onto the working electrode during application of a DC potential. The role of electrode reversibility was …
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The precipitation of uniform silica particles through the controlled hydrolysis of silicon alkoxides
The formation of uniform silica particles by the alkoxide route has been investigated. Rates of chemical reactions involved in the precipitation are reported and linked to particle growth rates. Seeded growth experiments indicate that reactions between soluble species occur at rates that are …
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Development of Soft-Matter Delivery Systems: Coupling pH Responsive Polymers to Porous Silica Particles
… induced self-assembly (EISA) mesoprous silica nanoparticles for potential use in controlled drug release and therapeutics. As demonstrated here, lipid bilayer coatings can be easily replaced with different polymer analogs allowing for dynamic response to environmental stimuli. In …
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An Investigation of Electrostatic Interactions Between Organically Functionalized Silica Particles, Surfaces, and Metal Ions
… on the electrostatic interactions between silica particles and either coated surfaces or metal ions. This work has two objectives: to begin a preliminary investigation into particle-surface systems that may be ideal for further investigation as a sensor and to investigate metal-ligand …
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New thin shell silica particles and HILIC phases for liquid chromatography: synthesis, characterisation and functionalisation
… of interest in the use of superficially porous particles with a solid core and a porous shell (also known as fused core, core-shell or porous shell) for fast and highly efficient separation of low molecular weight solutes to large and complex analytes, while avoiding excessive back pressure. In …
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Enhancement of antifouling properties using rice husk silica particles in polysulfone membrane and optimization of its operating condition
This study investigates the effects of rice husk silica (RHS) as additive in the polysulfone membrane to enhance antifouling properties in membrane separation process. The flat sheet PSf/RHS membrane was prepared via phase inversion technique. The characterization and performance test were …
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The Influence of Amorphous, Sub-Micrometer Silica Particles in Cement Pastes and Mortars with Very Low Water-to-Cement Ratios (Ultra-High Performance Concrete)
… the influence of amorphous, sub-micrometer silica particles in UHPCs. The present literature is equivocal about whether silica enhances clinker hydration due to its dissolution and subsequent pozzolanic reaction to calcium–silicate–hydrate phases (C–S–H phases) and/or due to a heterogeneous …
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Mechanical properties of dense suspensions: Variations with interaction potential
… studied experimentally. Monodisperse submicron silica particles in aqueous solutions were used as model suspensions. The interaction potential between the particles was manipulated from repulsive to attractive by adjusting the concentration of KCl and cetyllrimethylammonium bromide (CTAB) in the …
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Wettability of solid particles in relation to particle-stabilised foams and emulsions
Colloidal particles and surfactants are commonly used, either individually or combined, as stabilisers of emulsions and foams. While the properties of surfactants and particles under a range of conditions and concentrations are relatively well known, there are some areas that require further …
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Preparation, type and stability of emulsions stabilised by solid particles
… of emulsions stabilised solely by solid silica particles has been investigated in detail using a combination of conductivity, stability, light diffraction, optical microscopy and contact angle measurements. The wettability of the particles in situ at the oil-water interface plays a major …
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The preparation of solid core drug delivery system (SCDDS) via supercritical processing of fatty acids
… delivery system (SCDDS). Both, 0.5 μm and 1.0 μm silica particles were used as a model core material and were coated with different ratios of fatty acid. A proportional increase in particle size was observed with increasing ratio of fatty acid in the formulation. Coating of silica particles with …
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Evaporation of liquids from structured and non-structured mixtures
… ranging from 0.1 to 500 Torr, water contained in silica particles, alkane/squalane mixtures, hexane gelled with silica particles, surfactant/water mixtures, immiscible layered liquid mixtures and emulsions have been determined. For pure liquids and simple unstructured liquid mixtures, the …
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Studies into solid core drug delivery system using haemoglobin as a model drug and supercritical fluid processing for encapsulation
… system for oral delivery of proteins using silica as core material, haemoglobin as model drug and supercritical fluid processing as encapsulation technique. Silica particles of different morphology were used as a carrier material for protein immobilisation and fatty acids coating was …
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Calcium Carbonate Formation in Water Distribution Systems and Autogenous Repair of Leaks by Inert Particle Clogging
… of autogenous repair by clogging with inert particles was examined using silica and alumina. Small 250 m diameter pinhole leaks were simulated in bench-scale water recirculation systems. Silica and alumina particles were added to solutions ranging from high to low ionic strength to determine …
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UV curable powder coatings for the finishing of leather
… have been discussed as well. Nano-scale silica particles surface modified with acrylate has been studied, and their properties or properties of powder coatings formulated with the particles have been characterized. The powder coating rub fastness was improved by formulation with surface …
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Effect of silicon nano particles added to the polymeric coatings
… of a coatingto the same coating with added nano silica. The sample coating for this project was bis-ureasil which was synthesized using 1:1 equivalent ratio of bis (3-trimethoxysilyl-propyl) amine (BTMSPA) (318.0g) and IPDI (52.0g) in 400g of anhydrous THF. The other coating was prepared by …
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The Effect Of Colloidal Stability On The Heat Transfer Characteristics Of Nanosilica Dispersed Fluids
Addition of nano particles to cooling fluids has shown marked improvement in the heat transfer capabilities. Nanofluids, liquids that contain dispersed nanoparticles, are an emerging class of fluids that have great potential in many applications. There is a need to understand the fundamental …
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Novel Rubber Nanocomposites with Adaptable Mechanical Properties
… Instead of carbon black and conventional silica particles, the reinforcing agents used here were polymeric fillers and silica nanoparticles whose effectiveness in reducing the Payne effect were also examined In Chapter 2 a commercial polybutadiene rubber, CB 10, was quantitatively modified …
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