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 30 for “"structured surfaces"”.
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Structured surfaces for hemocompatibility
… fields. The quest to create highly hydrophobic surfaces is one such field. The application of this new generation of hydrophobic surfaces, however, has not received much research attention in comparison to the development of new methods to create surfaces. The one application of super …
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Structured surfaces at the extremes of heat transfer
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Electric field based fabrication methods for multi-scale structured surfaces
… for their potential to produce multi-scale structured surfaces. EPD uses electrophoresis to deposit thin films of nanoparticles, dispersed in suspension, onto charged or porous substrates. Depending upon the dispersion stability, the surface roughness can be modulated in order to affect the …
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Development and characterization of micro/nano structured surfaces for enhanced condensation
… of water vapor condensation on superhydrophobic surfaces, as well as the demonstration of such surfaces for enhanced condensation heat transfer performance. We first studied droplet-surface interactions during condensation on superhydrophobic surfaces to understand the emergent droplet wetting …
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Design guidelines of laser structured surfaces for enhanced pool boiling heat transfer
… the design and fabrication of laser processed surfaces for boiling applications.
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Dropwise condensation of water and low surface tension fluids on structured surfaces
… with thin hydrophobic coatings. Superhydrophobic surfaces made out of hydrophobic coatings on micro-or-nano-engineered surfaces have shown further heat transfer enhancement in dropwise condensation of water; however, the applications of these micro- or nanoscale structured surface designs have …
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Enhanced flow boiling heat transfer in microchannels with structured surfaces at varied mass flow rates
… d = 10 [mu]m, and pitch l = 40 [mu]m). The structured surface microchannels, due to their capillary pressure-induced wicking capabilities, exhibited less temperature rise and pressure drop fluctuations at high heat fluxes. Furthermore, it was verified that the critical heat flux value of all …
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Integration of freestanding polyelectrolyte multilayer membranes in larger scale structures
… of flat freestanding multilayer membranes to structured surfaces. We have developed a method that allows us to couple mm2 areas of defect free film with thicknesses down to 50 nm to structured surfaces and to avoid crumpling of the membrane. We could again use this technique to produce arrays …
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Enhancement Techniques of Boiling Heat Transfer
… of surfactants, and the second way is by using structured surfaces.</p> <p>The first technique is investigated experimentally with environmentally friendly surfactants. The surfactants chosen for the study are an ionic sodium lauryl sulfate (SLS), nonionic ECOSURF™ EH-14, and nonionic ECOSURF™ …
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The effect of surface roughness and surface finish on two-phase and single-phase heat transfer and pressure drop characteristics
… This dissertation systematically investigates structured surface fabrication strategies including laser texturing, chemical etching, sintering, and electrodeposition and evaluates their effects on pool boiling, flow boiling, and air-side convective heat transfer performance. A physics-based …
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Breakdown Anodization (BDA) for hierarchical structures of titanium oxide
… and nano-scale structures on titanium surfaces. This method uses environmentally friendly electrolytes, such as nitric acid, and can be fabricated within 30 minutes regardless of substrate size. Because the titanium dioxide is hydrophilic, the micro structured BDA surface exhibits …
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Micro and nanostructured surfaces for enhanced phase change heat transfer
… We designed and fabricated asymmetric nanostructured surfaces where nanopillars are deflected with angles ranging from 7 -52'. Uni-directional liquid spreading was demonstrated where the liquid propagates in a single preferred direction and pins in all others. Through experiments and …
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Using Anisotropic Micro-Scale Topography to Manipulate the Wettability of Aluminum and Reduce the Retention of Water
… the critical droplet size on micro-grooved surfaces. This model extends earlier work by accounting for the droplet geometry and contact-line changes caused by the micro-grooves. The model is validated through comparisons of predicted to measured critical droplet sizes, and it is then used to …
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Photoinduced wetting kinetics of water on immersed nanoporous titania surfaces with application to oil-water separation
We study the self-cleaning ability of titania surfaces in oil-water environments for fouling recovery in oil-water separation applications. A number of previous studies have shown that meshes and porous structures can be used to separate oil/water mixtures through careful control of surface energy …
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Theoretical Modeling of Polymeric and Biological Nanostructured Materials
… off-specular signals from periodically structured surfaces and has been validated on substrates measured by neutron scattering. In this dissertation, we improved the model using a computational optimization approach that simultaneously fits specular and off-specular scattering signals …
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Oberflächenanalytische Untersuchungen an nasschemisch, photochemisch und photothermisch modifizierten Titandioxid-Oberflächen
… and hydrophilic modified Titanium Dioxide surfaces (TiO2 surfaces) were studied with regard to macroscopic wetting properties and molecules relevant for wettability. The macroscopic wetting behaviour was studied by Contact Angle measurements and calculation of surface free energy Sigma. …
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Quantum reflection of Bose-Einstein Condensates
… Bose-Einstein condensates within 1 pm of solid surfaces where the atom-surface interactions can no longer be ignored. At long- range, the atom-surface interaction is described by the weakly attractive Casimir-Polder potential which is classically predicted to accelerate an incident atom toward …
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Functional and responsive surfaces via initiated chemical vapor deposition (iCVD)
… varying compositions and / or micro- or nano-structured surfaces. The novel copolymer thin film of iCVD poly(NIPAAm-co-di(ethylene glycol) divinyl ether) (p(NIPAAm-co-DEGDVE)) is shown to exhibit a sharp lower critical solution temperature (LCST) transition, better-than or equivalent to other …
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Anti-Adhesive Si-and F-Doped DLC Coatings and Micro-Nanostructured Surfaces for Medical Implants
… to develop a range of DLC coatings and micro-nanostructured surfaces with anti-bacterial properties for biomedical applications. In this study a DLC coating and Si- and F- doped DLC coatings with various Si and F contents were prepared by a radio frequency plasma-enhanced chemical vapor deposition …
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Impact and Departure Dynamics of Droplets and Bubbles
… departure dynamics that are happening on various surfaces. In Chapters 2 and 3, we will explore how raindrops can transmit plant pathogens. When the raindrop impacts the infected wheat leaf, the micron-sized dry spore can liberate from the surface in two different ways: dry dispersal and wet …
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