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 force"”.
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AFM surface force measurements between hydrophobized gold surfaces
… measurements of a hitherto unknown attractive force between two mica surfaces hydrophobized in cetyltrimethylammonium bromide (CTAB) solutions. Follow-up experiments conducted by many investigators confirmed their results, while others suggested that the "hydrophobic force" is an artifact due …
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Reverse osmosis transport phenomena in the presence of strong solute-membrane affinity
… the four parameter finely-porous model and the surface force-pore flow model were consistent with experimental results. From the finely-porous model the partition coefficient was found to be different on the high and low pressure sides of the membrane and this difference was a function of both …
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Effect of Surface Stress on Micromechanical Cantilevers for Sensing Applications
Three models for surface stress loading effect on a micromechanical cantilever are proposed as concentrated moment acting at the free end (Model I), concentrated moment plus axial force acting at the free end (Model II), and uniformly distributed surface force acting along the microcantilever …
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Unit cohesion and the Navy: does cohesion affect performance?
… tests and inspections on ships in the Naval Surface Force, U.S. Pacific Fleet. The MOE variables included retention rates, Supply Management Assessment scores, Maintenance and Material Management (3M) Inspection scores, Training Readiness Evaluations, and Operational Propulsion Plant …
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Numerical Simulation Of Stratified Flows And Droplet Deformation In 2D Shear Flow Of Newtonian And Viscoelastic Fluids
… to reconstruct the interface, the continuous surface force formulation to model interfacial tension forces and utilizes the semi-implicit Stokes solver (enabling computations at low Reynolds numbers). The algorithm is primarily designed to simulate the flow of superposed fluids and the drop in …
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A Study of the Volume of Fluid Method for Moving Boundary Problems
… the VOF method is combined with the Continuum surface force model. The governing flow equations for Newtonian fluids in incompressible flow in two dimensions are solved using the pressure-based algorithm. A linear interface reconstruction algorithm is developed and improved by interpolations. …
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Mechanism of C -Cadherin Binding: Multiple Adhesive Alignments and a Multi-Stage Unbinding Trajectory
… C-cadherin monolayers, that are used in the surface force measurements, is presented in the latter part of the thesis. Using ellipsometry, we monitor the binding of C-cadherin to lipid monolayers in real time. These data suggest that in the presence of calcium, cadherin forms adhesive …
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Studies of Thin Liquid Films Confined between Hydrophobic Surfaces
Surface force measurements previously conducted with thiolated gold surfaces showed a decrease in excess film entropy (£GSf), suggesting that hydrophobic force originates from changes in the structure of the medium (water) confined between hydrophobic surfaces. As a follow-up to the previous study, …
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Numerical Methods for Simulating Fluid Motion Driven By Immersed Interface
… and velocity fields into parts due to the surface force and due to the source and sink, with each part handled separately by means of an appropriate method. Because the singularly-supported surface force yields an unsmooth solution, that part of the solution is computed by using the …
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Derivation of a Numerical Method for Computing 3-D Magnetoplasmadynamic Flows in Thermodynamic Non-equilibrium
… when the magnetic term is treated as a body force and the electron pressure as a surface force. The method of flux vector splitting has been chosen to solve the set of <em>ns+</em>12<em> </em>equations, <em>ns </em>being the number of heavy particles involved in the flow. In addition, it …
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Nanoscale insight into tribomechanical and hydrothermal process at calcite surface
… and cementation, actively reconstruct calcite surfaces and are hypothesized to play a decisive role in modulating frictional response in carbonate-rich faults. Yet, the mechanisms linking nanoscale interfacial processes with macroscopic fault slip remain poorly understood. Our goal is to …
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Structural Basis of the Tensile Strength of Protein Complexes Mediating Cell Adhesion
… complexes of cell adhesion molecules undergoing forced detachment. Molecular-forces measurements combined with Steered Molecular Dynamic (SMD) simulations were used to investigate the mechanical response of the CD2 C58 and hemophilic C-cadherin bonds. The CD2-CD58 adhesive complex, important for …
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Development of an Immersed Boundary Method for the Simulation of Moving Bodies at Fluid-fluid Interfaces
… The methods developed to include the effects of surface tension and contact lines are presented. A detailed description of the numerical methods, as well as their implementation into a new software framework, are presented. Details regarding the solution of the resulting large systems of sparse …
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Investigation of smooth contact angle treatment in porous media
… and the significant effect of the capillary forces which arise at low capillary numbers. Therefore, the contact angle needs to be carefully treated. Mesoscopic techniques such as lattice Boltzmann methods are capable of dealing with lower capillary numbers as compared to the Navier-Stokes …
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Thermo-Capillary Driven Flow Under the Influence of Rotation and Magnetic Fields
… in space based processing. The control of this surface tension gradient driven flow is sought using (1) rotation and (2) magnetic field, and the effects of these are computationally studied in two separate parts. In the first part, the main parameters are the solutal Marangoni number Mc, …
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A study of direct powder rolling route for CP-titanium
… including rolling speed, roll gap size, roll surface width and powder feeding rate on the integrity of the metal powder compacted strip that is produced from the direct powder rolling process. The objectives of this work were to predict the powder rolling compaction performance in terms of …
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Direct Force Measurement between Surfaces Coated with Hydrophobic Polymers in Aqueous Solutions and the Separation of Mixed Plastics by Flotation
… so that it can selectively attach onto the surfaces of a rising stream of air bubbles. Thus, controlling the hydrophobicity of the minerals to be separated from each other is of critical importance in flotation. If one wishes to separate plastics from each other by flotation, however, it …
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Experimental Study of the Entrainment of Nanoparticles from Surfaces
… process of studying particle size, the effect of surface roughness was also found. Measurements of the detachment fraction of carbon particles as a function of flow rate show three distinct regimes that we attribute to the dominance of drag, energy accumulation by particles, and collision and …
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A Study of Molecular Orientation at Neat Liquid-Mica Interface by Sum Frequency Generation (SFG) Spectroscopy
… of ionic liquids at mica interface through surface force apparatus (SFA) and the atomic force microscopy (AFM). In order to compare the orientation of mica-ionic liquids interface, a series of ionic liquids were studied by using sum frequency generation vibrational spectroscopy. Through SFG …
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An Algebraic Volume of Fluid Method for Strongly Coupled Spacecraft Fuel Slosh Modelling
… for the first time) to a well balanced Continuum Surface Force (CSF) surface tension discretisation. The surface tension implementation, for which standard height functions are used, is shown to be well-balanced with an accuracy that compares favourably to existing methods. In the final part of …
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