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 426 for “"surface properties"”.
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Surface properties of asteroids.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Surface Properties of Hydrophilic Polymers
… polymer) soft, elastic gels (‘hydrogels'). The surface properties of this group of materials are important in both the dehydrated and hydrated state and yet no thorough-going study has been previously made of this aspect of these polymers. The surface properties in the dehydrated state govern …
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Surface properties of poly(bisphenol-A-carbonate)
… the development of a technique to measure surface free energies of amorphous polymers <br></br>(b) an investigation of chemical polishing and <br></br>c) the problems of injection moulded polycarbonate. <br></br><br></br>Grooves inscribed in an amorphous polymer surface change in dimensions …
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Acanthamoebal surface properties and the modulation of phagocytosis
The surface nature of Acanthamoeba trophozoites and cysts was investigated with respect to cell surface charge, hydrophobicity and surface carbohydrate composition. Particulate microelectrophoresis revealed a marked negative charge for both morphological forms, though less for cyst surfaces. …
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Investigation of Equestrian Arena Surface Properties and Rider Preferences
A synthetic surface with inconsistent mechanical properties is considered to be a risk factor for injury in horses. Research has been carried out involving the use of surface testing equipment predominantly on race tracks to improve knowledge on surface properties that are implicated in a higher …
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Effect of pavement surface properties on life cycle cost analysis
… normal operating conditions are due to pavement surface profile, while costs that occur during work zone activities are due to agency decisions on work zone conditions. In traditional LCCA, it is assumed that work zones costs are the main part of user costs. The work zone costs include vehicle …
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Relationship between molecular structure and surface properties of self-assembled monolayers
… thermal stability, and have favorable dielectric properties; consequently, polyimides are excellent materials for insulating layers in microelectronic devices. In this research, self-assembled monolayers are investigated for use as an adhesion promoter for metal substrates, and for corrosion …
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Hypercoiling and hydrophobically associating polymers : interfacial synthesis, surface properties and pharmaceutical applications
… (66-75%) of the ethyl ester side chains. Surface or interfacial tension/pH profiles were used to assess the conformation of both the poly(isophthalamides) and partially saponified PLETESA in aqueous solution. The results demonstrated that a loss of charge from the polymer was accompanied …
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The effects of the surface properties of thermal paper on fingermark visualisation
… understand the effect of the substrate properties of the papers on the development of latent marks, a range of techniques were used to study the substrate characteristics. Scanning Electron Microscopy and Energy Dispersive X-Ray spectroscopy was used to image the surface of the samples …
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Structural property relation in improving chemically and physically crosslinked hydrogel surface properties
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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A multi-technique approach to characterise acidic surface properties of microporous catalysts
… to arrive at petrochemical products. Thus, surface acidity in zeolites is crucial to understand to tune parameters such as activity and selectivity of zeolite catalysts to optimize product distributions. The objective of this dissertation was to validate the use of non-invasive nuclear …
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Investigation of the surface properties of gangue minerals in PGM bearing ores
The recovery of Platinum Group Minerals (PGM) and associated sulphides by froth flotation from the Bushveld Igneous Complex is complicated by the presence of naturally floatable gangue minerals such as talc. Although talc is present in small quantities it has a disproportionate effect on …
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Effects of surface properties on solder bump formation by direct droplet deposition
… study investigates the effects of wetting and surface roughness on droplet bouncing during solder bump formation. The potential for droplet bouncing is modeled based on the energy difference between the maximum spreading and equilibrium sessile stages of a deposited droplet. Validated by …
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Characterization and control of surface properties of degradable polyesters for cell culture
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
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The influence of surface properties on carbon fiber/epoxy matrix interfacial adhesion
… The focus of this work was to study carbon fiber surface chemical and physical properties and their effects on fiber/matrix adhesion. Untreated, commercially surface treated and oxygen plasma treated PAN based carbon fibers were used for study. XPS was used to determine fiber surface chemistry. A …
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Effects of Particle Surface Properties on Feeding Selectivity in Suspension-Feeding Bivalve Molluscs
… particles are not clearly understood, and the surface properties of a particle have been proposed as factors that contribute to particle selection. The effects of surface properties upon selection by suspension-feeding bivalves were examined. The charge and wettability of several different …
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Surface properties and the bioactivity of glass-ionomer dental cements and related materials
The improvement and modification of the surface hardness of glass-ionomer dental cements was investigated in the studies discussed in this thesis to allow the range of clinical applications of these cements to be extended. Storing the cements in non-aqueous media whilst heating at 60 oC increased …
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THE SYNTHESIS OF SILICON-MODIFIED LIPIDS AND THE INVESTIGATION OF THEIR SURFACE PROPERTIES
This work outlines the synthesis of three novel silatrane-functionalized lipids and the exploration of their capacity to undergo spontaneous particle formation in aqueous environments. The chemoenzymatic synthesis of the lipids required 1,3-diacylglycerides of octanoyl, lauroyl, and palmitoyl acyl …
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