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 31 for “"latex particles"”.
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Chromatography of Latex Particles in Packed Columns (Hydrodynamic, Dispersion)
… development in the characterization of colloidal particles has been the adaptation of liquid chromatography techniques to the determination of particle size distributions of polymer latexes. In this work, techniques that involve packed columns with either nonporous packing material (termed …
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The control of gold and latex particles on optical waveguides
The trapping of microparticles by optical methods using a focussed laser beam, known as optical tweezers, has evolved rapidly in the last thirty years. However this process is limited to the trapping of a small number of particles. Evanescent wave trapping allows simultaneous trapping of many …
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Morphological study of composite latex particles and water interaction with polymer chains
… study of composite polymer (2 or more) nano-particles in an aqueous dispersed system. This included synthesis, characterization and mathematical/numerical modeling. For a composite latex particle, the morphology can play an important role in determining the final application properties, and …
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Synthesis and Application of Well-Defined Stimuli Responsive Materials
… polarized light was studied in thin films and latex particles. Relief gratings were fabricated in a single step via proximity field nanopatterning which provided interesting surface structured materials without the need for development or post curing. The same material was used to prepare …
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Coagulant dipping of natural rubber latex
… made of' the coagulant dipping of natural rubber latex using calcium, chloride as the coagulant. The primary object of the investigation was to deepen understanding of the kinetics and the mechanisms of deposition. Results are given for the effect of variables such as solids content, latex …
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Biocompatible polymeric nanoparticles for drug/DNA delivery using biologically friendly polymerisation processes
… as the biomedical applications of polymer nanoparticles synthesised via RAFT.<br/><br/>Chapter 2 explores the synthesis of well-defined cross-linked star polymer model networks (CSPMNs) equipped with both acid-labile and non-degradable cores to study potential drug release in acidic conditions. …
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Characterization of the Capsular Polysaccharide of Haemophilus parasuis and its Application in the Diagnosis and Prevention of Glasser's Disease
… assays. CP antisera were conjugated to latex particles to create an agglutination assay for detection and typing of H. parasuis. CP was conjugated to Cholera Toxin B, and used to immunize mice and piglets before challenge with H. parasuis to determine its protective efficacy against …
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Funktionalisierte Polymerkomposite auf Basis von Poly(3,4-ethylendioxythiophen) und Gold
… materials is the synthesis of colloidal particles. Thus, this work focuses on the development of conductive particles by preparing composite structures. Polymeric colloids like latex particles and microgels were used as templates for the oxidative polymerization of EDOT. Depending on …
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Oral uptake and distribution of microspheres
… may be penetrated by sub-micron sized polymeric particles which have the capacity to deliver therapeutic compounds. We investigated this, initially with Fluoresbrite™ carboxylate latex microspheres (0.87 m diameter) which were administered orally to rats. Microsphere numbers within blood samples …
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Rheological Investigations of Latex-Surfactant-Associative Thickener Aqueous Systems
… film. In this work, quaternary systems of Water-Latex-Thickener-Surfactant were investigated to further the understanding of their behavior in coatings. The thickener used was a well characterized, hydrophobically-modified, ethoxylated urethane (HEUR) with two C18 terminal hydrophobes and 795 …
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Understanding particulate coating microstructure development.
… gradients are all determined by the way the particles come together as the coating dries. Cryogenic scanning electron microscopy (cryoSEM) is one of the most effective methods to directly visualize a drying coating during film formation. Using this method, the coating is frozen, arresting …
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Stress and microstructure development in particle-based coatings
… promote drying uniformity. CryoSEM revealed that latex coatings dried on substrates (with photoresist walls) exhibit a greater degree of drying uniformity. Silicon cantilevers with poly(dimethyl siloxane) (PDMS) walls along the perimeter were used to suppress the effects of lateral drying during …
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Colloidal microgels: synthesis, characterisation and applications
… behaviour with oppositely charged polystyrene latex (PS) particles. It has been shown that the particle size, concentration and temperature play an important role in the ionic interaction between oppositely charged microgel and PS latex particles. Some particulate dispersions have shown …
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Micron-bubble streaming flow towards micron to sub-micron sized sorting
… experiments have been conducted on polystyrene latex particles as well as several types biological cells and its infectious viruses, specifically Sulfolobus islandicus with Sulfolobus spindle-shaped viruses, and also Escherichia coli with Lambda phage. Size sensitive sorting has been revealed by …
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Colloidal Self-Assembly: Particle Synthesis, Functionalisation and Applications
Colloids, broadly defined as particles small enough to not sediment under gravitational force while dispersed in a continuous medium, are of great scientific and industrial importance. They are present in foods, cosmetics, paints and other materials, often in a jammed or a gelled state. This …
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Colloidal phoretic motion
Phoretic motion refers to the transport of particles up or down the concentration gradient of a different solute and can be exploited to control particle motion. This thesis seeks to understand the relative importance of different phoretic effects. It examines phoretic motion in the context of …
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Transport and damage in hydrated coatings – a model soft active composite material
… polymer films composed of coalesced latex particles, as the model active material system. The free volume theory was applied to latex particle boundary networks to understand transport which leads to volume swelling. More hydrophilic boundary networks led to higher water diffusivity …
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STUDY OF COLLOIDAL INTERACTIONS MEDIATED BY BIOMOLECULAR RECOGNITION AND BY ELECTROKINETIC FLOWS.
… performed on a dispersion of charged spherical latex particles having two peculiar properties: their surface can be functionalized with various surfactant molecules and their refractive index is very close to that of water. We have quantified interparticle interactions through the measurement of …
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An investigation of the molecular structure, composition and biophysical properties of gum Arabic
… adsorption of the samples onto polystyrene latex particles was observed, which resulted in an increase in thickness of the adsorbed layer as a consequence of the interaction between the protein and carbohydrate within the molecules adsorbed on the emulsion surface. Preliminary analyses of …
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Stress, fracture, and microstructure development of drying aqueous particulate coatings
… Additionally, aqueous formulations often rely on latex particles to coalesce and form a continuous film at room temperature. In this work, two characterization methods were developed to support the research and development of aqueous particulate coating formulations. The first method measures the …
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