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 93 for “"microstructured"”.
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Microstructured Halide Perovskites for Energy Applications
Perovskites are cutting-edge materials that have demonstrated outstanding potential in the field of renewable energy. Their unique chemical-crystalline structure enables the easy substitution of atoms with various elements, allowing for a diverse range of optoelectronic properties that make them …
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Design optimization of heterogeneous microstructured materials
… establish a design optimization methodology for microstructured materials. The material design problem is stated as finding the optimum microstructure to maximize the desired performance satisfying material processing constrains. This problem has been solved in this thesis by means of numerical …
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Tunable wettability of microstructured polypyrrole films
… A fabrication procedure that produces robust microstructured polypyrrole (PPy) that quickly and reversibly switches between the superhydrophobic and superhydrophilic states is discussed. The polymer is doped with perfluorooctanesulfonate ions which diffuse in and out of the film upon an …
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Direct and inverse design of microstructured optical fibres
Microstructured optical fibres, where an arrangement of air holes running longitudinally along the fibre guides light in either a solid or a hollow core, have created new opportunities in diverse areas of science and technology. Applications range from the generation of supercontinuum light to …
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Biomimetic adhesion for transfer printing via microstructured surfaces
… fabrication, and iii testing of a variety of microstructured surfaces intended to control adhesive strength by increasing it and decreasing it, as needed. Finally, I will present the results of our experiments and draw conclusions about the effectiveness and future potential of transfer …
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Enhanced Laminar Convective Heat Transfer using Microstructured Superhydrophobic Surfaces
For many centuries, researchers have investigated the complex interactions between a solid surface and a fluid in motion relative to the surface. For many cases, the classical no slip boundary condition holds true. However, there are a subset of situations where this assumption is not valid, and …
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Magnetic fields near microstructured surfaces : application to atom chips
Microfabricated solid-state surfaces, also called atom chip', have become a well-established technique to trap and manipulate atoms. This has simplified applications in atom interferometry, quantum information processing, and studies of many-body systems. Magnetic trapping potentials with arbitrary …
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Microstructured materials synthesis via salt-assisted ultrasonic spray pyrolysis
… salt-assisted USP for making a wide variety of microstructured materials and highlights a few applications of the materials formed, including superhydrophobic surfaces, energy storage, and controlled drug release and hyperthermia. First, salt-assisted USP is used to make roughened ZnO …
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Heat transfer via dropwise condensation on hydrophobic microstructured surfaces
… dropwise condensation and film condensation on microstructured silicon chips were compared. Heat transfer coefficients are found to be seventy percent higher in the hydrophobic, dropwise condensation case relative to the hydrophilic, film condensation case. With this increased heat transfer …
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Probing the liquid-vapor interface in microstructured heat exchangers
… to understand the liquid-vapor interface in microstructured heat exchangers. The two aspects include: design and fabrication of a custom vacuum chamber faceplate and the investigation of the liquid meniscus shape on microstructured devices. The faceplate for the vacuum chamber consisted of …
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Nonlinear applications of step-index and microstructured soft-glass fibres
This thesis focuses on the potential of compound-glass, highly nonlinear, small-core fibres for use in nonlinear applications. Both fibres with a conventional step-index design and small-core holey fibres are considered. While the former technology is more mature, the latter represents the ultimate …
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Development and applications of dispersion controlled high nonlinearity microstructured fibres
… sample applications, and modelling.<br/><br/>Microstructured fibre fabrication allows for great flexibility in core and cladding structure designs, with the large available refractive index contrast between glass and air. This allows the control of waveguide dispersion across a wide wavelength …
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Deposition of electronic and plasmonic materials inside microstructured optical fibres
… devices. Only recently, with the advent of microstructured optical fibres and templating material processing methods, it has been possible to create optical fibres with solid-state material inclusions. An experimental investigation on the optical transmission properties of microstructured …
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Fundamental investigations on periodic nano- and microstructured organic solar cells
Using organic semiconducting materials in solar cells is a new approach with <br>promising possibilities. The great potential of low cost production combined <br>with mechanical flexibility gives rise to new applications. Due to the relatively simple fabrication process from solution and the …
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Magnetic tunable microstructured surfaces for thermal management and microfluidic applications
… fabrication process for magnetically tunable microstructured surfaces, where the tilt angle can be controlled upon application of an external magnetic field. We also demonstrated this platform for droplet manipulation in heat transfer applications. The tunable surfaces consist of ferromagnetic …
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Microstructured tungsten thermophotovoltaic selective emitters c by Natalija (Zorana) Jovanović.
This research investigates the fabrication, modeling, characterization, and application of tungsten two-dimensional (2D) photonic crystal (PhC) structures as selective emitters and means of achieving higher efficiencies in thermophotovoltaic (TPV) energy conversion systems. Important aspects of the …
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Investigating Wetting Characteristics on Microstructured Surfaces for Superhydrophobicity and Metal Microcasting
… more fully understand how liquid interacts with microstructured surfaces, this dissertation introduces a direct method for determining droplet solid-liquid-vapor interfacial geometry on microstructured surfaces. The technique performs metrology on molten metal droplets deposited onto …
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Investigating wetting characteristics on microstructured surfaces for superhydrophobicity and metal microcasting
… more fully understand how liquid interacts with microstructured surfaces, this dissertation introduces a direct method for determining droplet solid-liquid-vapor interfacial geometry on microstructured surfaces. The technique performs metrology on molten metal droplets deposited onto …
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Fabrication, characterization, and wettability analysis of a microstructured hybrid hydrophobic/hydrophilic surface
This thesis explores the effects of surface chemistry and geometry on wettability of Hybrid Surfaces. The Hybrid Surfaces are composed of many micropillars with hydrophobic sidewalls and hydrophilic tops. The surfaces are designed with stable dropwise condensation in mind, which can increase heat …
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