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 12 of 12 for “"surface excess"”.
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Adsorption in Confined Aqueous Films
… concentration in dilute (<1 M) solution. The surface excess of adsorption for fluorescein was shown to depend on both the Debye-length and the separation distance between two interfaces. Increasing the Debye-length from 4 nm to 21 nm increased the plateau surface excess at large separations, …
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Structure and dynamics of adsorbed polymer
… physisorbed from solution to a single solid surface. Measurements of the surface excess, segmental orientation, bound fraction, segment-surface interaction enthalpy, and adsorption-desorption kinetics were made using Fourier transform infrared spectroscopy in the mode of attenuated total …
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Implications of Diversity: A Study of the Evolution of the Adsorption States of Macromolecules at Surfaces
… macromolecules from solution onto single solid surfaces, focusing on the evolution of compositional heterogeneity of the layer. The origin and development of adsorption states within the physisorbed layer is noted in both chemically homogeneous and heterogeneous layers and is inferred from …
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Vibrational Spectroscopy and Atomic Force Microscopy Studies of Silane Adsorption onto Silicon and Glass.
… onto silica surfaces, was investigated by Fourier transform infrared attenuated total reflection, (FTIR-ATR), spectroscopy and by atomic force microscopy, (AFM). The rate of formation of the monolayers and the effect of surface coverage on the packing of these …
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Adsorption from binary solutions of polar n-decyl derivatives and heptane onto alumina
… with heptane onto alumina was studied. The net surface excess isotherms were measured and resolved into component isotherms. The heat of immersion of the alumina in n-decanol, ethyl octanoate, and n-decanoic acid solutions was measured. The heats of immersion support the resolved isotherms which …
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A new class of photoresponsive surfactants
… irradiating light source, cause changes in the surface tension, critical micellization concentrations (CMC), and self-assembly behavior. Differences in saturated surface tensions (at concentrations above their CMCs) were as high as 14.4 mN/m under radiation of different wavelengths. This large …
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Studies on the Adsorption of Surfactants and Polymers to Surfaces and Their Effects on Colloidal Forces
… In this thesis, I also describe the effect of surface charge density, surface crystallinity, surface heterogeneity, and preadsorbed polymer on surfactant adsorption. A new method for the stabilization of colloidal particles is introduced via the synthesis and adsorption of unnatural proteins. …
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Surfactants at fluid interfaces: molecular modeling and deep learning
… critical micelle concentration, limiting surface tension, and maximum surface excess for various surfactants. The performance of the model in capturing the relationship between molecular design parameters and surfactant properties was critically evaluated. The dataset, model development, …
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Amphiphilic hyperbranched polyglycerols for industrial and biomedical applications
… including live cell encapsulation, cell surface decoration, and antifouling coatings. The wide range of uses exemplify their modularity and utility. Herein, we report two distinct amphiphilic HPG materials designed for applications in nanomedicine and industry. Theranostic agents have the …
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Investigating the bioprotective properties of sugars
… free energy change of micellization ( Gmic), surface pressure, surface excess concentration and area occupied per surfactant molecule. The free energy penalty of hydrocarbon chain exposure was obtained from the Gibbs free energy change of demicellization( Gdemic) which is equal but opposite in …
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A Multiscale Study of Foam: The Phase Behavior, Transport, and Rheology of Foam in Porous Media
… of the foam flow in porous media for subsurface applications such as gas mobility control, aquifer remediation, CO2 sequestration, water production control etc. In enhanced oil recovery (EOR), gas flooding has superior crude oil displacement efficiency where the gas sweeps. However, the …
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An investigation of liquefied shear strength using novel centrifuge tests, direct simple shear tests, and field case histories
… to mimic shearing along a critical slip surface in a flow liquefaction failure and to produce additional data pairs of su(liq) and CPT tip resistance. Porewater pressure along the coupon shear surface was directly measured using a miniature pressure transducer embedded in the coupon. With …