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 296 for “"Surface Charge"”.
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Membrane Surface Charge and Lipid Signaling in Phagocytosis
… is their contribution to the negative surface charge of the inner leaflet of the plasmalemma. The unique negativity of the inner aspect of the plasma membrane serves to attract and anchor key signaling and effector molecules that are required to initiate phagosome formation. Conversely, …
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Surface Charge Regulation Effects on Fluidic Nanoscale Systems
… many engineering applications. Due to the large surface area to volume ratios of these systems, interfacial phenomena are of key importance to understanding their behavior. We present several studies of uidic nanoscale systems using the Poisson{Boltzmann equation which treats the uid as a …
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Study and analysis of surface charge collection and emission spectrum of plasma ashing process
… presents an important observation on the total surface charge collection using quantox wafers through the measurement of surface voltage (Vs) on wafer surface with contactless Kelvin Probe for changes in parameters during plasma ashing. In this report, it is covered on the plasma characteristics …
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The effect of phyllosilicate mineralogy and surface charge on the rheology of mineral slurries
… vermiculite and chrysotile in terms of their surface charge, mineralogical and resultant rheological properties. The thesis was initiated in order to gain a better understanding of the flow behaviour of these minerals within well-defined model mineral systems, with a longer term view to …
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Surface charge properties and physical characterization of spent oil shale from the Tosco-II process
Includes bibliographical references.
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The Surface Charge of Soft and Hard Sphere Colloidal Particles - Experimental Investigation and Comparison to Theory
… the thermal energy, the method was termed microsurface potential measurements (MSPM). We then used the MSPM to measure the potential at the outer Helmholtz plane (oHp), the diffuse potential, which determines the electric double layer of surface charged colloidal particles. The MSPM were …
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The Effect of Stability and Surface Charge Distribution on Secretion of Bovine Pancreatic Trypsin Inhibitor From Yeast
… of the BPTI mutants shows that removal of charges results in a drop in the effective number of ionic binding sites, as analyzed by binding of the molecule to a cation exchange column. Removal of the charge on the uncharged face of the molecule results in a dramatic increase in the relative …
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Examining the Effects of Applied Potential on the Surface Charge of Functionalized Monolayers for Site-Directed Ionic Self Assembly
The focus of this dissertation research involves surface charge manipulation of functionalized monolayers. Application of potential to acid or base terminated organic films immobilized on electrodes results in the ionization of the terminal groups. The ionization of these groups using applied …
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A numerical model for the axisymmetric equilibrium shape of drops in uniform motion: Effects of external flow, electric field and surface charge
… influence of vertical electric fields and drop charges has also been investigated. A finite volume method with numerically generated transformation to a boundary-fitted coordinate system was used to calculate the shape-dependent electric field. Sufficient constraints (viz, drop volume, overall …
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The effect of glow discharge on silicon surface barrier detectors
… paper is devoted to the study of the effect of charge particle bombardment on surface-barrier detectors in a glow discharge tube. It is found that positive ion bombardment causes an increase in junction capacitance of the detector, while the electron bombardment causes a decrease. This …
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Investigating the relative adsorption of polymeric depressants on pure minerals
… minerals because of the differences in the surface charge of the minerals which arise as a result of their different chemical structures. Zeta potential measurements were conducted to establish exactly what these differences in surface charge were and what role metal ions in solution played …
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Electrokinetic characteristics of particulate/liquid interfaces and their importance in contamination from semiconductor process liquids
… in nature. In liquids, these particles develop a surface charge, the magnitude and sign of which is unique for a particular solid/liquid combination. The substrate that is processed in liquids also develops a similar surface charge, and if the charge on the substrate and impurity particles are …
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Membranes for sustainable heat-to-electricity conversion
… is in turn controlled by membrane dimensions and surface charge, creating unique opportunities to design membrane-based materials that are both functional and environmentally benign. In this context, cellulose membranes offer a highly sustainable, abundant and biodegradable platform with rich …
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Cellular responses to potential biomaterials
… interdisciplinary study combines the elements of surface characterisation and biological testing to determine the nature of the biomaterial/host interface. Polarity and surface charge were found to have an important influence on fibroblast adhesion to hydrogel polymers, by virtue of their …
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The interaction of metal ions at the hydrous manganese dioxide-solution interface
… study of the interaction of metal ions with the surface of hydrous manganese dioxide has been completed. The results of these experiments have greatly improved our qualitative understanding of the adsorption mechanism and have also provided a means of testing quantitatively the proposal that the …
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Insulator-insulator Contact Charging As A Function Of Pressure
… with good theoretical understanding of the charge exchange mechanism. However, insulator – insulator charging is not as well understood. Theoretical and experimental research has been performed that shows that the surface charge on an insulator after triboelectric charging with another …
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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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Graphene/Oxide Interactions with Polymer Networks Modeled Using Molecular Dynamics
… platelets within PMCs is inhibited by molecular surface charge potentials. Further simulations were conducted to demonstrate functionalized forms of graphene, specifically graphene oxide, have altered surface charge potentials which render them miscible within PMCs. To quantify the effect of …
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Predictive Modelling of the Growth of Nanoscale Silver Particles: Verification of an Aggregative Growth Mechanism
… addition. These particles are stabilized by the charge associated with adsorbed borohydride anions, but continue to grow by aggregation and coalescence. The surface charge is extremely sensitive to solution conditions, and was measured by two independent techniques which showed the same …
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