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 86 for “"surface coating"”.
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Surface coating deterioration studies
… project is concerned with the deterioration of surface coatings as a result of weathering and exposure to a pollutant gas (in this case nitric oxide). Poly(vinyl chloride) (PVC) plastisol surface coatings have been exposed to natural and artificial weathering and a comparison of the effects of …
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Automated techniques for surface coating deterioration studies
… ageing studies involving polymer based surface coatings. These techniques were required in order that the effects of low concentrations of pollutant gases, specifically nitric oxide, on surface coatings could be investigated with a reasonable degree of precision. As part of this …
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Optimal surface coating distribution on a femoral endoprosthesis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Nonaqueous Synthesis of Metal Oxide Nanoparticles and Their Surface Coating
… the synthesis and characterization of various surface coated metal oxides, including silica, titania and polymer coated nanocomposites are reported. The silica coating process is presented as a highlight of this part. By using a microemulsion system, core-shell structure silica coated iron …
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Controlled Evaluation of Silver Nanoparticle Dissolution: Surface Coating, Size and Temperature Effects
… by both internal and external factors. First, surface coating effects were investigated by using three different coating agents (BSA, PEG1000, and PEG5000). Capping agent effects nanoparticle transformation rate by blocking reactants from the nanoparticle surface. Coatings prevented dissolution …
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Experimental Study of Wall Shear Stress Modification by Surface Coating: Pressure Drop Measurements in a Rectangular Channel
… that drag reduction is possible over hydrophobic surfaces in the Wenzel state during laminar and turbulent flows. Quantification of surface drag reduction in rectangular channel flow over walls with specific hydrophobic or hydrophilic properties was obtained with pressure drop measurements along …
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Nanoscale structural/chemical characterization of manganese oxide surface layers and nanoparticles, and the associated implications for drinking water
… water by developing Mn-oxides (MnOx(s)) bearing coating layers on the surface of filter media. Multiple models have been developed to explain this Mn2+ removal process and the formation mechanism of MnOx(s) coatings. Both, experimental and theoretical studies to date have been largely focused on …
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Effects of Microbial Community Stress Response and Emerging Contaminants on Wastewater Treatment Plants
… dosed with gold nanoparticles with varied surface coating and morphology indicated that nanoparticle morphology impacted the microbial community and antibiotic resistance gene content more than surface coating. However, nanoparticle fate was controlled by surface coating more than …
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Synthesis, Characterisation and Antifungal Activity of Copper(II)-Functionalised Silicone Polymers and Silicone-Coated Magnetic Nanoparticles
… The same suite of polymers were also formed as a surface coating on magnetite nanoparticles (Fe3O4-MNPs). Copper(II) ions were coordinated to the pendant amine groups of all of the polymers. In vitro tests using the fungal pathogen, Candida albicans, revealed that the silicone polymers, their …
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Exploring approaches to functional surface modifications using an atmospheric plasma jet printer
… printer to create highly functional, tailored surface modifications and coatings. Understanding the processes which occur in the plasma are essential to use the plasma jet printing parameters to control the features of the surface coating formed. High speed video analysis and optical emission …
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Coating of Polyvinylchloride for Reduced Cell / Bacterial Adhesion and Antibacterial Properties
A Polyvinylchloride surface was modified by coating a biocompatible, hydrophilic and antibacterial polymer by a mild surface modification method. The surface was first activated and then functionalized, followed by coating with polymer. The surface functionality was evaluated using cell adhesion, …
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The mechanism for free chlorine oxidation of reduced manganese in mixed-media filters
… the amount and oxidation state of the MnOx(S) surface coating initially on the media and the influent pH had major influences upon the uptake of soluble manganese. From numerous Mn (II) uptake studies with different media and varying pH conditions, oxide-coated filter media continuously …
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Design of an aluminum-powered reverse osmosis desalination system for disaster relief
… aluminum by first treating it with a minimal surface coating of gallium and indium (<3% by mass) and then reacting it with water to produce hydrogen, which can supply a fuel cell or internal combustion engine to generate electricity, and heat, which can be used to desalinate and purify …
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An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits
… pyrrhotite tailings. Passivation enables surface coating of the sulfide thus inhibiting attack by oxidising agents. Promotion of passivation of pyrrhotite during flotation to produce un-reactive tailings has not been explored to date. Polyethylene polyamines (DETA/TETA), which are already …
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An investigation of factors influencing the bioavailability of silver nanoparticles within a terrestrial system
… molitor. Nanoparticle size, concentration, and surface coating were examined in addition to soil pH, humic content, and clay content. All insects in treatment groups with a soil concentration of 25 ppm or higher were found to contain at least trace amounts of silver. Root samples of both plant …
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Electrochemical corrosion testing of boronized and unboronized steels
Boronizing is a thermo-chemical surface coating technique with which surface properties of materials are enhanced substantially. One of these properties is corrosion resistance. Corrosion resistance testing has been performed in many ways right from the traditional weight loss methods to the latest …
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Nanoscale properties of poly(ethylene terephthalate) vascular grafts
… still a major challenge in biomaterials. Due to surface forces, blood plasma proteins adsorb to the graft, resulting in inflammation, infection, thrombus formation, and ultimately, vessel reclosure. The object of this project was to characterize and analyze the nanoscale surface properties of …
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Digital Protein Analysis: Technologies for Protein Diagnostics and Proteomics through Single-Molecule Detection
… of millions of protein molecules on a solid surface, the interrogation of those molecules by fluorescently-labeled antibodies, and the identification and quantification of those molecules by single molecule resolution imaging. By systematically investigating the parameters that have prevented …
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Self-assembly of bioactive or electrocatalytic polyaspartamide nanoparticles
… to control the structural integrity and the surface functionality of nanoparticles. Innumerable methods to assemble bioactive or electrocatalytic nanocarriers were proposed to dates; however, most approaches accompany complex chemistry and multiple purification, thus reducing production yield …
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Direct Single Molecule Imaging of Enhanced Diffusion for Enzymes and Enzyme-conjugated Dna origami
… single enzyme diffusion. We tried different surface coating methods (polymer brush coated surface and lipid bilayer coated surface) and different viscosity agents (methylcellulose and glycerol) to slow diffusion and facilitate tracking. We found that high amounts of glycerol inhibited enzyme …
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