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 34 for “"Capillary force"”.
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Capillary Force in High Aspect-Ratio Micropillar Arrays
… are susceptible to deformation due to surface forces, such as adhesive force and capillary force. In this thesis we have explored the capillary force driven mechanical instability of HAR micropillar arrays. We have shown that when a liquid is evaporated off the micropillar arrays, the pillars …
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Microstructure-induced capillary force effects on penetration and release in hydroxyapatite bone scaffolds
… upon implantation via micropore-induced capillary forces. The localization and entrapment of cells within the micropores forms a reservoir of cells that not only can begin the process of bone formation but can also signal other cells to further enhance the regeneration process. I also …
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Three-dimensional nanofabrication by electron-beam lithography and directed self-assembly
… (EBL), block copolymer (BCP) self-assembly, and capillary force-induced self-assembly. We first developed new processes for fabricating 3D nanostructures using a hydrogen silsesquioxane (HSQ) and poly(methylmeth-acrylate) (PMMA) bilayer resist stack. We demonstrated self-aligned mushroom-shaped …
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Shape Evolution of Nanostructures by Thermal and Ion Beam Processing
… thermal fluctuations. Thus, the system-inherent capillary force can initiate morphological transformations during further processing steps or during operation at elevated temperature. Therefore and because of the ongoing miniaturization of functional structures which causes a general rise in …
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Stratification in Drying Particle Suspensions
… cylinder and apply the results to understand the capillary force experienced by a spherical particle at a liquid-vapor interface. My analyses show that the capillary force is approximately linear with the displacement of the particle from its equilibrium location at the interface. An analytical …
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An Investigation of Pore Collapse in Asymmetric Polysulfone Membranes
… substructure. Water-wet membranes experience capillary force during water evaporation. Since the modulus of the membranes is lower than the capillary force, the membrane walls shrink and thicken giving rise to a condensed structure. The "skin" regulates permeation through the membranes which …
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Phase transition induced deformation in porous media
Capillary condensation-evaporation and freeze-thaw processes are the most familiar examples of first-order phase transitions in equilibrium thermodynamics. Porous, amorphous materials are widely used in everyday life, yet their complex spatial structures lead to unresolved questions for statistical …
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Two-phase flow processes with dynamic effects in porous media - parameter estimation and simulation
… to the understanding of dynamic effects in the capillary pressure-saturation relationship on the local scale and macroscale as well as giving an assessment as to when these effects might need to be taken into account for the evaluation of two-phase flow processes. In a general form, the …
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X-ray Scattering Study Of Capillary Condensation In Mesoporous Silica
The capillary condensation deforms a nanoporous material due to the capillary force generated by the fluid inside the pores. In-situ small and wide angle x-ray scattering(S/WAXS) were used to study the deformation with respect to relative vapor pressure of the fluid. Periodic mesoporous silica such …
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Theoretical and Experimental Investigation of Adhesion in Microelectromechanical Systems
… deformation due to both contact and adhesive forces was developed. Specifically included in this model was the solid surface interaction inside the contact area. It was found that due to asperity deformations, the capillary force of contacting asperities increases with increasing interference, …
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Theoretical and experimental investigation of particle interactions in pharmaceutical powder blending
… process. In this work, inter-particle adhesion forces including van der Waals force, capillary force and electrostatic force of lactose monohydrate and microcrystalline cellulose were measured by the atomic force microcopy and other techniques. Their correlations with particle properties and …
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Dispersion of particles on liquid surfaces
… This explosive dispersion is the consequence of capillary force pulling particles into the interface causing them to accelerate to a relatively large velocity. The maximum velocity increases with decreasing particle size; for nanometer-sized particles (e.g., viruses and proteins), the velocity on …
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Conceptual models of fluid flow in fractures
… It is then absorbed by the matrix due to the capillary suction. Then, due to the capillary force, the liquid moves towards the heat source. A region of liquid vapor flow is formed which is called the heat pipe region. The heat pipe phenomenon will be analyzed for different models of fractures. …
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Non-coalescence of Jets
… the ratio between inertial and surface tension forces. A parametric study of the characteristic of bouncing jets, conducted by varying the nozzle diameter, jet velocity, angle of inclination and fluid viscosity reveals the scaling laws for the quantities involved such as contact time. These …
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Solder self-assembly for MEMS fabrication
… on the 25 micron scale onto substrates using the capillary force of solder. This is an order of magnitude smaller than current solder self-assembly in the literature. This thesis also examines self-assembly of high aspect ratio (2:1) microfabricated structures, which poses a greater challenge in …
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Design, Fabrication, and Experimental Investigation of an Additively Manufactured Flat Plate Heat Pipe
… cross section was designed to enhance the capillary force and to demonstrate the capability of additive manufacturing to manufacture complex shapes. This work describes the challenges associated with the development of heat pipes using additive manufacturing such as de-powdering and …
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Experimental Study of Meniscus Thin-Film Evaporation in a Horizontal-Tube, Falling-Film Heat Exchanger, Focusing on Dynamic Contact Angle Variation of an Advancing Meniscus
… and evaporation heat transfer by exploiting the capillary pumping of the porous matrix, which worked to passively spread the solution fluid across the entire tube surface. The thin film created in the many menisci in the porous layer worked to further enhance evaporation due to the lowering …
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Mobilization and Flow of Multiple Oil Slugs in Water Saturated Capillary Models
… and flow of Multi-Oil Slugs (MOS) inside capillary models saturated with water, attempting to understand the mechanism on how single oil slug (SOS) and MOS inside the capillary models are mobilized and stabilized inflow under static external pressure. The mobilization and stabilization …
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The post-dehydration processing and the effects on the structural modifications and functionalities of milk protein powders
… by water droplets and absorbing more water by capillary force. But the influences on whey protein were limited, only if using lecithin as a liquid binder. Agglomeration exhibited no advantageous effects on the solubilisation of milk protein powders. The HS granules even delayed the release of …
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Multiphase flow in porous media: the impact of capillarity and wettability from field-scale to pore-scale
… of fluid-fluid interfaces, which are subject to capillary forces. Multiphase flow in porous media is important in many natural and industrial processes, including geologic carbon dioxide (CO₂) sequestration, enhanced oil recovery, and water infiltration into soil. Despite its importance, much of …
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