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 27 for “"micropillars"”.
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Efficient fabrication of micropillars for water repellency using photolightography
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Synthetic Gecko Inspired Dry Adhesive Through Two-Photon Polymerization for Space Applications
… could both maximize adhesion by shearing the micropillars toward the tilted direction when preload force is applied. The improved microstructure fabrication process could produce micropillars in the height of 270 μm with soft polymer without defects. However, the miniaturized micropillars in …
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Capillary Force in High Aspect-Ratio Micropillar Arrays
… compliance and large surface area, the micropillars 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 …
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Modeling Droplet Impingement Dynamics on Micropillar-Arrayed Viscoelastic Substrates Through Microgeometry-Free and Multiscale Methods
… is constructed with the detailed geometry of micropillars omitted. In contrast, by multiscale modeling, two different geometric-scale domains are employed to investigate the deformation of individual micropillars in the smaller domain named zoomed-in domain and the effects of the deducted …
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Surface structure enhanced microchannel flow boiling of low surface tension fluids
… wall of silicon test samples, with/without micropillars of two different heights (25 and 75 µm) and two different cylindrical pillar solid fractions (~ 5% and 20%). For methanol, a maximum CHF of 494 W/cm^2 was achieved with a structured surface, a 61% enhancement compared to smooth surface. …
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Fabrication, characterization, and wettability analysis of a microstructured hybrid hydrophobic/hydrophilic surface
… 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 fluxes by an order of magnitude over those of filmwise condensation. Based on the literature …
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IN VITRO MODULATION OF HUMAN CORNEAL ENDOTHELIAL CELL BEHAVIOR VIA TOPOGRAPHICAL AND BIOCHEMICAL CUES
… that we test are nanopillars, microwells, and micropillars. The biochemical cues are extracellular matrix coating of fibronectin-collagen I, FNC Coating Mix, and laminin-chondroitin sulfate. Our results indicate that topographical and biochemical cues are able to alter HCEC behavior. Engineered …
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Analyzing Extracellular Vesicles as Potential Biomarkers of Stroke Using Polymer Microfluidic Devices
… with a high-density array of antibody-modified micropillars for the affinity selection of CD8+ or CD15+ EVs with an analysis time less than the 4.5 h recombinant tissue plasminogen activator effective therapeu-tic time window. We successfully developed a microfluidic device with a high-density …
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Electrospray emitters For diffusion vacuum pumps
… molding are successful in reproducing arrays of micropillars.
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Solid-liquid interactions in microscale structures and devices
… Polydimethylsiloxane (PDMS) surfaces composed of micropillars of various sizes and arrangements by means of soft lithography. Both anisotropic surfaces, consisting of parallel grooves and cylindrical pillars in rectangular lattices, and isotropic surfaces, consisting of cylindrical pillars in …
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Enhancing the Light output of Solid State Emitters
… reducing the excitation area of the sample using micropillars and gold aperture masks, combined with increasing the extraction efficiency of light using a solid immersion lens. The observation of individual exciton emission enabled their contribution to the power dependent blueshift of type-II …
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Granular Shape Memory Ceramics
… has been previously demonstrated with SMC micropillars and individual microparticles, but these material forms lack useful applications. By utilizing easily scalable granular packings of discrete free particles, the transformation can be triggered in bulk without fracture in much the same …
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From Micro- to Nano-Scale: Applications of Solid-Phase Enzymatic Reactors for Biopolymer Disassembly
… coupling to carboxylic acid functionalized PMMA micropillars. Our micro-scale results suggest that the reaction efficiency for the catalysis of dsDNA digestion using λ-exonuclease, including its processivity and reaction rate, were higher when the enzyme was attached to a solid support compared …
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Microstructure design of mechanically alloyed materials
… Furthermore, postmortem images of compressed micropillars machined out of these compacts suggest that this alloy deforms by shear localization. The penetration performance of this alloy is explored in sub-scale ballistic tests into concrete targets, and is found to be at least as good as …
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Three-Phase and Unidirectional Heat Transfer
… the wetted wick structure, height of the wicking micropillars, wettability of the opposing smooth surface, and heat sink temperature. Our findings show that a vapor space height of Hᵥ≈ 250 μm, short and densely packed micropillars, a higher applied heat flux in the forward mode, and a hotter heat …
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Experimental Investigation of Critical Heat Flux Enhancement on Engineered Surfaces with Infrared Thermometry
… crisis on surfaces with engineered hydrophilic micropillars. To achieve these goals, we have developed a special heating surface enabling the use of high-resolution infrared thermometry to obtain the time-dependent temperature and heat flux distribution on the boiling surface. Thank to this …
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Parallel nano-manufacturing via electro-hydrodynamic jetting from externally-fed emitter arrays
… microchannels as compared to those consisting of micropillars. We also demonstrate the existence and location of a flow maximum with respect to the width of the microchannels. We test arrays with as many as 225 emitters (25 emitters/cm²) and with emitter densities as high as 100 emitters/cm². The …
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Spatial Dynamics and the Mechanoresponse in CD4+ T Cell Activation
… are relatively stationary, T cells activated on micropillars slowly migrate towards the base of the array. Forces exerted during this migration are substantially greater than those previously measured, and the slow migration leads to the characterization of multiple phases and the relocalization …
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Mechanistic Understanding and Enhancing Pool Boiling Heat Transfer via Surface Property and Structure Design
… with microtube clusters interspersed with micropillars, referred to as tube-clusters in pillars (TIP), to mitigate the earlier boiling crisis of uniform microtube arrays due to the extensive bubble coalescence. While uniform microtube arrays and TIP surfaces showed significant enhancement …
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Size Effects in Shape Memory Ceramics
… that do not crack as these structures, like the micropillars and microparticles, satisfy the constraint of having relatively few sites of high stress concentrations. This led to the investigation of optical floating zone and cold crucible induction crystal growth of zirconia-based SMCs. Single …
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