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 36 for “"surface charge density"”.
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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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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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Molecular mechanics of cartilage : quantification of GAG electrostatic interactions via high-resolution force spectroscopy
… repulsion forces between negatively charged glycosaminoglycan (CS-GAG) macromolecules are a major determinant of cartilage biomechanical properties. It is thought that the electrostatic component of the total intermolecular interaction is responsible for 50-75% of the equilibrium …
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MODELLING POLYMER-INDUCED ADHESION BETWEEN CHARGED MEMBRANES: THEORETICAL AND COMPUTATIONAL APPROACH
… the adhesion between two identical planar charged surfaces embedded in a uncharged polymer-containing electrolyte solution. The solution mimics physiological fluids: It contains 0.1 M of mono-valent ions and a small number of divalent cations that form tight bonds with the headgroups of the …
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Charge Transfer at Thin-Film Modified Solid -Liquid Interfaces in the Absence of Redox-Active Moieties
… the insulating monolayer film. The current density is limited by Ohmic transport and by space charge at low and intermediate anodic potentials respectively. At higher anodic potentials, quantum mechanical tunneling of the electron from the ground-state energy level of the electrolytic ionic …
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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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The effect of a DC voltage on the catalytic combustion of natural gas in air over platinum
… These effects are dependent on the catalyst surface charge density but not on the direction of the field. Greater effects were also observed when the field was applied on the upstream rather than the downstream side of the catalyst. Although the mechanism of this quenching effect is unknown, …
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Electrodeposition of cermets
… the application of a resistant coating to the surface of a common metal. Electrodeposited cermet coatings have proved very satisfactory: some of the factors underlying the cernet electrodeposition process have been investigated. A ceramic particle in contact with an electrolyte solution will …
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A malaria diagnostic system based on electric impedance spectroscopy
… as well as differentiation of micro-beads by surface charge density using EIS-based diagnostic system. Diagnosis based on EIS has merits over other diagnostic methods since it is label-free and quantitative test and applicable to whole blood, and also the test does not need bulky optical and …
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Charge transfer at thin-film modified solid-liquid interfaces in the absence of redox-active moieties
… the insulating monolayer film. The current density is limited by Ohmic transport and by space charge at low and intermediate anodic potentials respectively. At higher anodic potentials, quantum mechanical tunneling of the electron from the ground-state energy level of the electrolytic ionic …
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Nonlinear electrokinetic transport and its applications under combined AC and DC fields in micro/nanofluidic interface devices
… EDL thickness and nanochannel wall surface charge density. We understand that for a highly ion−selective nanochannel, the application of combined AC/DC electric field, at amplitudes greater than the DC voltage and at low Strouhal number, results in large dual concentration …
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Simulation of the CRUD formation process using the Lattice Boltzmann Method
… This effect is especially strong near the CRUD surface. In addition, the results imply that the CRUD formation rate increases approximately linearly with the zeta potential (surface charge density), and Fe$^3+$ ion concentration.
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Studies on Hydrogen-Pinch Analysis and Application of COSMO-SAC to Electrolytes
… probability distribution of the surface-charge density, which enables the application of solvation-thermodynamic models to predict vapor-liquid and solid-liquid equilibria, and other properties. We propose to add an additional term to the exchange energy to account for ion-ion …
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Adsorption of cobalt, chromium and barium on ripidolite and kaolinite as examined by x-ray photoelectron spectroscopy
… can be related to changes in the electron density or charge on the atom of interest. Adsorption experiments were carried out in aqueous solution at controlled pH's of 2, 4, 6, 8, and 10 for Ba²⁺, Co²⁺, Cr³⁺, adsroption on the clays kaolinite and ripidolite. Solution processes were monitored …
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Polymer Micro- and Nanofluidic Systems for In Vitro Diagnostics: Analyzing Single Cells and Molecules
… devices were used to study the effects of surface charge on the electrodynamic transport dynamics of target molecules. In this work, we report the fabrication of mixed-scale micro- and nanofluidic networks in poly(methylmethacrylate), PMMA, using thermal nanoimprint lithography using a …
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In-Plane Conductance of Thin Films as a Probe of Surface Chemical Environment: Adsorbate Effects on Film Electronic Properties of Indium Tin Oxide and Gold
… as a result of chemical adsorption at the surface. Reaction of the indium tin oxide (ITO) surface with Bronsted acids (bases) leads to increases (decreases) in its in-plane conductance as measured by a four-point probe configuration. The conductance varies monotonically with pH suggesting …
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Transport properties of synthetic nanopores
… can be deployed to study the translocation of charged molecules and ions, a process of main importance in biology. However, researchers run into problems to build and control such small devices. Surface properties, thermal fluctuations and the discreteness of matter dominate at the nanoscale, …
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Application of COSMO-SAC to Solid Solubility in Pure and Mixed Solvent Mixtures for Organic Pharmacological Compounds
… is a molecular-specific distribution of the surface-charge density, which enables the application of solvation-thermodynamic models to predict vapor-liquid and solid-liquid equilibria, and other properties. The VT-2005 Sigma Profile Database generally focuses on solvents and small molecules, …
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Ion specific effects on charged interfaces
The physico-chemical phenomena occurring at charged interfaces are specifically affected by the type and the concentration of electrolytes. This has implications both in living and in inorganic systems. The discovery of the ‘ion specific effects’ dates back to Hofmeister (1888), who observed the …
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Osmotic reflection coefficient
… computational models to predict [sigma]o for charged porous membranes and charged fibrous membranes. The effects of molecular shape on [sigma]o for rigid macromolecules in porous membranes were analyzed using a hydrodynamic model. In this type of model, employed first by Anderson and Malone, …
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