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 56 for “"surface adsorption"”.
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Macromolecule Loading on PLGA Particles through Surface Adsorption
… I proposed to load macromolecules onto the surface of PLGA particles functionalized with biotin (“PLGA-biotin”).</p> <p>The specific binding between avidin and biotin (or desthiobiotin) was employed to enable surface adsorption. The pair has the strongest known non-covalent affinity, an …
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Long Chain Molecules in the Molten State: Surface Adsorption, Near Surface Structure, and Mutual-Diffusion
<p>The surface segregation in a binary mixture of polymer due to surface energy difference or end-grafting is studied. The surface energy difference induced segregation is compared with the mean-field theory. The end-labeling of chains strengthens the ability of the chain to bind to the surface, …
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Surface adsorption and pore-level properties of mineral and related systems of relevance to the recycling of paper
… and then use the knowledge gained to improve the adsorption of stickies. The pore level properties of the minerals used to control stickies are highly relevant in regulating adsorption of the stickies. Levels of pore architecture were investigated by characterising filter media with porosimetry, …
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Covalent Modification that Enhances Protein Properties and Functions and Folds Random Coil into Alpha-Helix
… the fundamental science of aggregation and surface adsorption of proteins is critical for developing protein-based drugs, understanding aggregation-induced diseases and for preventing biofouling that impacts a wide range of industries. In spite of the advances in sensitive and …
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SiC and B₄C as electrocatalyst support materials for low temperature fuel cells
… polymer electrolyte fuel cells (PEFCs). High surface area carbons are commonly utilised as support materials for platinum due to low cost, large surface areas and high conductivity. However, PEFCs using this technology undergo oxidation of carbon supports, significantly reducing the lifetime …
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A Comparison of Gas Chromatographic Properties of Chromium (Iii) and Iron (Iii) Tris (Ethylenediamine) Exchanged Montmorillonites
… Retention mechanisms of microsieving and surface adsorption are compared and discussed. The effects of percentage of substitution and heating on d₀₀₁-spacing and surface area are compared. The iron (III) complex showed possible decomposition upon contact with water.
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X-band ENDOR and S-band ESEEM of paramagnetic disordered solids
… catalytically active alumina and silica-alumina surfaces were studied. Complex ENDOR spectra were obtained. The magnitudes of the principal elements of the anisotropic hyperfine matrix for each chemically distinct type of proton could be determined by means of a computer simulation analysis. The …
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A Study of Heat and Mass Transfer in Porous Sorbent Particles
… such as mass diffusion, heat transfer and surface adsorption-desorption. A novel methodology is proposed in this work that combines models that account for the multi-scale and multi-physics phenomena involved. Pore-resolving DNS calculations using an immersed boundary method (IBM) framework …
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Layered Double Hydroxides as Anion- and Cation-Exchanging Materials
… with LDH would most likely occur by surface adsorption, lattice metal replacement, or by intercalation into the LDH interlayers. Although infrared spectroscopy finds it main use through the identification of the anions incorporated with LDH, it can also be used to study and identify …
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Stabilization of liposomal functional anchors by cross-linkable lipids
… vesicles are modified post- fabrication through surface adsorption and anchoring. We hypothesized that the sequential adsorption of functional units followed by covalent cross-linking of the liposome would provide enhanced stability in the presence of human serum. To investigate this hypothesis, …
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Modeling of Kinetically Limited Growth Rate for Solution-Synthesized Germanium Nanocrystals
… is developed that considers both diffusion and surface kinetics. The diffusion coefficient of Ge monomers through the solvent, octadecene, at elevated synthesis temperatures is estimated to be on the order of 10-5 to 10-4 cm2/sec, while the mass transfer boundary layer thickness is estimated to …
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Delipidation Treatments for Large-Scale Protein Purification Processing
… that a larger phase volume and internal adsorption of the lipids onto the Sephadex matrix dominates over surface adsorption. Polyclonal ELISAs indicated that 89 + 6% of the recombinant human Protein C was still present in the transgenic whey after this delipidation treatment, indicating …
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Organic complexes of unrefined and milled kaolin: An infrared spectroscopic study.
Aim: to characterise the surface sites present on unrefined and ball milled Cornish kaolin, with a view to ultimately determining the mode of interaction between the mineral and industrially significant organic molecules. Milling and temperature were found to affect the structure of kaolin and …
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Predicting Transitions in Fischer-Tropsch Reactors
… processes, it is catalysed on a transition metal surface, and the lifetime of the catalyst bed largely dictates the process’s economic viability. Predictive computational models can shed light on the mechanisms driving catalyst deactivation. This work focuses particularly on reactors with a …
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The investigation of interactions between single walled carbon nanotubes and flexible chain molecules
… colloidal stability, such polymers can control surface adsorption, aggregation and in some instances, select particular diameters or chemical species for stabilization. A central challenge is how to predict the ability of a polymer to adsorb and stabilize a nanorod dispersion based on the …
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Path integral Monte Carlo simulations of solid H2 surfaces and thin 4He films on H2 substrates
… We find evidence of quantum exchange in surface terraces for up to 1K. Second, the melting of the H$\sb2$ surface between 3 and 15K is examined since this is the cleanest example of quantum surface melting. Third, atomically thin superfluid $\sp4$He films on H$\sb2$ surfaces are …
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Molecular simulation of biomaterials and biomolecules at the solid-liquid interface
… However, detailed mechanisms of peptide adsorption on inorganic surfaces have largely escaped characterization. This knowledge would open new routes for the rational design of nanostructures and composite biomaterials. The development of accurate and computationally efficient methods for …
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Development and characterization of novel detectors for use in flow injection analysis or liquid chromatography
… forced to flow radially across the electrode surface. The arrangement of the electrodes in the cell was intended to result in large analytical currents while minimizing electrical resistance and analyte band spreading in the detection zone. The detector was evaluated in terms of its minimum …
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Adsorption of Dendritic Fluorocarbon End-Capped Poly(Ethylene Oxide) at an Air-Water Interface – A Synthetic, Analytical and Computational Study
Adsorption of amphiphilic polymer molecules to an interface can induce interesting properties on both the bulk of the material as well as the interface itself. Previous experiments carried out by other groups at Durham University have shown that functionalizing PEO with fluorocarbon groups can lead …
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An Improved MUSIC Model for Gibbsite
… that have proposed MUSIC models for gibbsite surfaces have purported to achieve a very good fit with potentiometric titration data. However, in order to achieve such results, several significant parameters, such as the number of surface sites, site densities, and pKa values were sometimes …
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