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.
Results
Showing 1 to 20 of 70 for “"Surface Composition"”.
-
Switching of surface composition and morphology of binary polymer brushes
Switching of surface composition and morphology of binary polymer brushes in response to changes in solvent selectivity, heating above glass transition temperatures, and contact with a rubbery stamp was studied. The binary brushes: polystyrene/poly(2-vinyl pyridine) (PS/P2VP), …
-
Constraints on the surface composition of Trojan asteroidsfrom near infrared (0.8-4.0 μm) spectroscopy and spectral modeling
The present surface composition of primitive objects provides clues to understanding the conditions under which the solar system formed. Characterization of the inner solar nebula progresses rapidly due to remote studies of asteroid and planetary surfaces as well as laboratory analyses of …
-
An investigation into the effects of surface composition and preparation on the mechanical properties displayed by equestrian surfaces.
… of materials currently used for equine arena surfaces, all of which can be expected to have different physical and mechanical properties. There is currently little published research examining the characteristics of these surfaces, or describing methods which can be used to test them. The aims …
-
Surface composition analysis of ultra-shallow surface regions in complex multilayers and multicomponent alloys by ion scattering and photoelectron spectroscopy
Author requested closed access (OA after 2yrs) in Vireo ETD system
-
Chemical Tagging of Surface Composition Gradients With Polystyrene Nanospheres and the Extracellular Matrix Protein Fibronectin for the Study of Cellular Migration
Surface composition gradients show great promise as tools in understanding cellular adhesion and motility. Gradients in surface electrochemical potential were prepared by poising two ends of a thin Au film at different potentials relative to a common solution Ag/AgCl reference couple, resulting in …
-
Deciphering the role of surface composition and topography in self-organized ion-induced nanopatterning of multicomponent semiconductors with in-situ and in-operando metrology
… the early stages of both topographical and compositional evolution of ion-induced nanopatterning on GaSb utilizing in-operando Grazing-Incidence Small-Angle X-ray Scattering (GISAXS), X-ray Photoelectron Spectroscopy (XPS), and Low Energy Ion Scattering Spectroscopy (LEISS) techniques, the …
-
Surface reaction mechanisms as a function of surface composition, adsorbate coverage, and adsorbate acidity: I. Trimethylgallium on metal-treated silicon. II. Hexafluoropentanedione, methanol, and acetone on copper
… determined as a function of adsorbate coverage, surface composition, and surface temperature. As the average of trimethylgallium on Si(100) is increased, the reaction mechanism evolves from intramolecular decomposition, forming methane at very low coverage, to intermolecular interactions at half …
-
Detecting surface inhomogeneity of asteroids
This thesis investigates the detection of surface composition inhomogeneity on asteroids using time-series spectroscopy and photometry. Observations were conducted on three test cases—Pluto, asteroid 2005 EK70, and the weather satellite Meteosat-11 using the Mookodi instrument on the Lesedi …
-
Novel analytical method for investigating compositional driven ion-induced nanopatterning of multicomponent materials
… to pattern formation. Several of these describe compositional mechanisms – particularly segregation and phase separation – as having a dominant role in the ion-induced nanopattern formation, and motivate the investigation of how both the surface composition and topography evolve with ion …
-
Multiscale Simulation of Atmospheric Pressure Pulsed Discharges Used in Polymer Surface Functionalization
… the impact of gas flow on radical generation and surface treatment. Convective gas flow alters the relative abundance of reactive species in the discharge that affects the surface composition. Continuous surface processing was simulated, wherein radicals formed on the polymer move out of the …
-
Surface characterization of LDEF materials
… exposed to the low-Earth orbit environment. Surface characterization of LDEF materials included polymers, composites, thermal control paints, and aluminum. X-ray photoelectron spectroscopy (XPS}, Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and contact angle analysis …
-
Tailored Materials for Surface-Enhanced Raman Spectroscopy
Surface-enhanced Raman spectroscopy (SERS) is a useful analytical tool that has grown in popularity since its discovery 40 years ago. Presently, a large number of materials are used as SERS substrates, including thiol-functionalised nanoparticles which form a large class of SERS-active materials as …
-
Adsorptive Immobilisierung von Kollagen Typ I an Titanoxidoberflächen
… of the implants. Newer studies focus on the surface composition of the implants in particular the modification with biological components. Collagen is the main component of bone and is therefore an interesting substance for the base modification of titanium implants. The aim of the work was …
-
Surface analysis of a black coating from Little Lost River
… spectroscopy (XPS) to characterize the outermost surface of the black coating to understand how it was formed. Carbon and oxygen predominated in the XP spectra, whereas nitrogen was detected at varying levels in different samples. High-resolution carbon 1s XP spectra showed that carbon was present …
-
Kinetic studies of ethane dehydrogenation using carbon dioxide as mild oxidant over gallium aluminum mixed oxide
… studied in this work. We identified an optimized composition of the mixed oxide prepared via the co- precipitation method at a surface Ga/Al ratio of 0.1 and conducted a series of kinetic measurements on different surface Ga loadings. The kinetic parameters are found to be sensitive to the surface …
-
Surface Modification and Controlled Assembly of Molecular Materials
… specifically designed to bind at the growing surface. It was found that inhibitors had qualitative effects on the morphology and on the surface composition of the crystals and that the surface and bulk properties had potential to be modified independently. Copper-pyridine crystals were studied …
-
Influence of oxygen vacancies on oxygenate reactions over SnO₂(110) single crystal surfaces
… on stoichiometric and defective Sn0₂ (110) surfaces. The extent of dissociation of these acids depends on the surface composition and the strength of the acid. Two crystallographically inequivalent types of oxygen vacancies can be introduced onto SnO0₂ (110) surfaces, and the kinetics of the …
-
Innovative processing strategies for the development of highly-dispersible, protein-enriched dairy powders
… of this thesis was to investigate the impact of composition (e.g., protein content), processing parameters (e.g., heat treatment) and novel technologies (e.g., gas injection) on the physical and functional properties of MPC powders. Initial studies on MPC ingredients demonstrated that …
-
Modeling Pluto's light curve in the near infrared : implications for observation post new horizons
The effects of volatile transport on Pluto's surface on ground-based observations of Pluto's light curve were studied. Due to Pluto's eccentricity of 0.249, obliquity of 123 degrees, and atmosphere, the transfer of volatiles may cause global surface change over the course of Pluto's orbit. Magellan …
-
A novel measurment of net erosion and plasma-material interaction in plasma thrusters
… the plasma retention and contamination in the surface layers. This insight into the surface composition and PMI is one of the major advantages of this technique when compared to other measurement methods. As an initial assessment of this technique's applicability for plasma thrusters, it has …
Page 1 of 4