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 125 for “"Surface Coverage"”.
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Surface Coverage and Structure of Catalytic Monolayers on Au(111) Electrodes
… electrode potentials, the anion desorbs from the surface, confirming activity observed with SPM. Quartz crystal microbalance studies found a mass change smaller than that expected for a full monolayer of $\alpha$-dodecatungstosilicate anions, indicating that there is only a monolayer present on …
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The Role of Surface Coverage of Reaction Intermediates in Heterogeneous Electrocatalysis
… is critical to understand the role of catalyst surface coverage and how it relates to two important mechanistic parameters, reaction orders and Tafel slopes. On heterogeneous catalysts, lateral interactions between neighboring intermediates can lead to non-linear correlations between reaction …
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Influence of Molecular Orientation and Surface Coverage of w-Functionalized Mercaptans on Surface Acidity
… the orientation of the functional group has on surface acidity. 3-dodeycloxymercaptophenol and 4-dodecyloxymercaptophenol differ in that the hydroxyl group is substituted on different carbons of the benzene ring. The difference in substitution patterns should present the hydroxyl group in …
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Influence of cation size and surface coverage upon the infrared spectrum of carbon monoxide
… in the environment local to the electrode surface. Potential Difference Infrared Spectroscopy was used to investigate the structural behavior of CO adsorbed on a platinum electrode. Carbon monoxide was found to be exclusively linear-bonded on platinum electrode in the presence of tetra-n …
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Role of Aqueous Phase Chemistry, Interfacial Film Properties, and Surface Coverage in Stabilizing Water-In-Bitumen Emulsions
… concentration, pH, interfacial film properties, surface coverage, drop size, and emulsion packing. Model water-in-oil emulsions were prepared from aqueous phases consisting of reverse osmosis water and salts (NaCl, CaCl2, Na2SO4, KCl and Na2CO3). The organic phases consisted of either asphaltenes …
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Nano-contact printing of DNA monolayers
… with one master copy and the oligonucleotide surface coverage was analyzed using tapping mode atomic force microscopy (AFM). The percent coverage of oligonucleotide was then calculated from the tapping mode AFM phase images. Two general trends were found. The oligonucleotide surface coverage …
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Impact of Polymers on the Solution Crystal Growth Rate of a Poorly Water-Soluble Active Pharmaceutical Ingredient
… were able to achieve a higher degree of surface coverage than those that adsorbed in a coiled globule formation. The surface coverage was found to directly correlate to polymer effectiveness. By modeling this correlation using the Kubota-Mullin model, polymer effectiveness could be …
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Surface complexation modeling of Pb(II), Cd(II) and Se(IV) onto iron hydroxides in single and bisolute systems
… fate and transport of metal ion contaminants in surface and groundwaters. Surface Complexation Models (SCMs) have emerged as the most promising tools for predicting contaminant ion sorption to iron (hydr)oxides. The reliability of SCMs is highly dependent on the ability to select appropriate …
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Hollow cathode life time modelling
… oxide<br/>depletion model, a low work function surface coverage model and a plasma update<br/>procedure to calculate the effects that a change in the insert surface work function will<br/>produce on the cathode plasma.<br/><br/>The barium-oxide depletion model has been validated by comparing its …
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Interactions and Dynamics of Soft Materials
… to investigate thee molecular weight dependence, surface coverage dependence, surface property dependence of polymer interfacial diffusion. We also developed a set of novel instrumentations to study the translational dynamics of polymer melt within highly confined geometry.
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Impedance-Based Structural Health Monitoring to Detect Corrosion
… moisture penetrates the protective barrier of a surface, starting an electrochemical process which over time leads to surface pitting. The combined action of mechanical stresses and corrosion induced pitting reduces structural integrity as the pits enlarge to form nucleation sites for surface …
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Growth and Behaviors of InN/GaN Multiple Quantum Wells by Plasma-Assisted Molecular Beam Epitaxy
… the RHEED intensity transient features with surface atomic processes such as the adsorption/desorption of metal species, the growth process was successfully monitored in situ. Also, at the high growth temperature, RHEED was successfully used to study the adsorption/desorption kinetics of …
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Adsorption Kinetics and Phase Behavior of Particles Adsorbed at an Interface
… the adsorption dynamic, phase behavior, and surface pressure of a monolayer of adsorbed particles in two-dimensional systems are key aspects of many current research areas. Examples include phase transitions in amphiphilic monolayers, emulsion stability due to particle adsorption at …
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Electrical and optical studies on carbon nanotube arrays
… arrays. Ultrathin films formed by sub-monolayer surface coverage of SWNT arrays are very interesting systems in terms of the physics of two-dimensional electronic transport. We have observed that they behave qualitatively different than the classical conducting films, which obey the Ohm’s law. …
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Characterization of pi-donor chiral stationary phases through a thermodynamic study of analyte adsorption
… methylene groups regardless of the extent of surface coverage, the strands of bonded phases are likely inhomogeneously spaced forming ""patches"" on the surface. ""Patches"" of bonded phase, the sizes of which change with surface coverage, are found to influence $\Delta$H and $\Delta$S by …
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An Experiment Assessing the Potential for Compost-Amended Lawn Topsoil to Inhibit Storm Quickflow
… for the environment due to increasing impervious surface coverage enhancing quickflow discharge in the catchment. This makes increasing surface infiltration and soil water retention in urban areas a matter of high importance. Lawns, forming a substantial fraction of suburban space, are a …
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Adsorption on smooth electrodes: A radiotracer study
… of the radiotracer method to these smooth surfaces have led to direct in-situ measurements from which surface coverage was determined; anions and molecules were identified; and weak interactions of adsorbates with the surface of the electrodes were readily monitored.
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Excited State Dynamics of Dyes Bound to Nanocrystals
… systems consist of dye molecules bound to the surface of wide-bandgap semiconductor metal oxide NPs. The dye molecules absorb light, and the excited dye molecules then transfer an electron to the conduction band (CB) of the NP. These dye-NP systems are used for applications such as solar cells …
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MicroCantilever (MC) based nanomechanical sensor for detection of molecular interactions
… study are to investigate the mechanism governing surface stress generation associated with chemical or molecular binding on functionalized microcantilevers. Formation of affinity complexes on cantilever surfaces leads to charge redistribution, configurational change and steric hindrance between …
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Modeling the Nucleation and Growth of Colloidal Nanoparticles
… of nanoparticles of different sizes, the ligand surface coverage for each individual size, and the parameters involved in altering the size distribution. Additionally, thermodynamic calculations of nanoparticle growth and ligand-metal binding as a function of size and ligand surface coverage were …
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