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 61 for “"Repellency"”.
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Droplet repellency of microfabricated surfaces in saturated environments
This thesis reports changes in apparent contact angles for droplets of various liquids on microstructured surfaces in saturated environments. Micro scale pillar surfaces maintain the non-wetting Cassie-Baxter regime for drops of water over a range of saturation temperatures while micro scale …
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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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The influence of contact line dynamics on drop deposition, repellency, and condensation.
For many years, solid-liquid and liquid-liquid interfacial dynamics have attracted attention in a variety of natural and industrial applications, including inkjet printing, water harvesting, and spray coating technologies. In a solid-liquid interface, when a droplet is placed on a solid substrate, …
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Water repellency effects on liquid- and vapor-phase water exchange in soil and clay minerals
… conditions and wildfires can induce soil water repellency. Precipitation shifts are expected to exacerbate drought and wildfire in regions such as the southeastern United States, making it critical to understand how repellency affects water exchange processes in soil. The objectives of this …
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Field and Laboratory Studies on the Development and Control of Soil Water Repellency of Sand Root Zone Mixes
Localized dry spots (LDS) associated with water repellent (i.e., hydrophobic) soils have detrimental effects on the survival, playability, and aesthetic value of creeping bentgrass (Agrostis palustris) used for golf course putting greens. The development of water-repellent soils, using molarity of …
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Evaluating Five Years of Soil Hydrologic Response Following the 2009 Lockheed Fire in the Coastal Santa Cruz Mountains of California
… runoff. Soil infiltration and soil water repellency were evaluated with rainfall simulations, Mini-disk Infiltrometer (MDI) and water drop penetration time tests (WDPT) at sites represented by variations in burn severity, soils, and vegetation types throughout the Scotts Creek watershed …
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Liquid repellent surfaces
… novel "multi-functional effects" fabrics such as repellency against toxic chemical agents. In order to produce repellent coatings the surface must have a low surface energy. To obtain this, inert chemical groups need to be attached to the solid substrate. In addition to chemistry, surface …
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Mechanisms by Which Grass Reduces Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), Abundance in Alfalfa
The apparent repellency of grass was investigated in order to determine the means by which potato leafhoppers perceive the presence of grass, to determine the behavioral changes caused by grass which lower abundance in alfalfa, and to test the resource concentration hypothesis for the potato …
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Tailoring hydrodynamics of non-wetting droplets with nano-engineered surfaces
… have focused on how textures induce more water repellency, and how these textures can be manufactured with different methods and materials. However, few studies have shown how these surfaces benefit the real energy processes in which the interaction between liquid droplets and solid surfaces is …
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Investigation of impregnants for low-cost buildings
… to consolidate mud brick and effect water repellency.
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Correlation of Polymer Performance and Hansen Solubility Parameters
… not a good predictor of hydrophobicity or stain repellency performance.</p> <p>This conundrum led to research into Hansen solubility parameters (HSP) and whether these could be used as performance predictive tools. Since HSP of polymers cannot be directly measured, Group Contribution Theory (GCT) …
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Micro-textured surfaces for omniphobicity and drag-reduction
… various interesting phenomena such as super-repellency, low hysteresis, and liquid slip. The current thesis research aims to extend the understandings about the role of surface texture on the static and dynamic behavior of the liquids forming composite interfaces on these textured surfaces. …
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The influence of fungi upon soil structure and soil water relations
… through measures of subcritical water repellency. Initially no correlation was reported but a further temporal investigation that involved a soil inoculum detected a significant positive effect; the results indicated that a certain concentration of protein is required before an …
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Chemical and Physical Characterization of Pre- and Post-Fire Soils for Wildfires in the Western US and Laboratory Burns
… can cause the formation of post-fire Soil Water Repellency (SWR), which reduces water infiltration into the soil. This may induce cascading disasters including flooding, land and debris slides, and deterioration of water quality. Despite numerous studies, chemical nature of SWR is still poorly …
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The Behaviour of the House Mouse (Mus Musculus L.) in Relation to the Development of a New Control Method Using Contact Rodenticides
… reference to tubes and tunnels. 2. Possible repellency of rodenticide formulations. 3. Development of a suitable formulation. 4. Design of an applicator to ensure optimal uptake of rodenticide. Experimental simulations of house mouse infestations in food storage premises were developed and …
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The toxicity and repellent properties of plant extracts used in ethnoveterinary medicine to control ticks
… Initial results of the tick-climbing repellency bioassay illustrated that a 30% concentration of crude acetone extracts of A. ferox, A. marlothii and C. glabrum; DCM extracts of R. communis and A. marlothii and MeOH extract of J. curcas repelled the ticks to a statistically significant …
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Coating Performance on Preservative Treated Wood
… solvent-based coatings showed better water repellency for CCA and untreated wood, but there was no significant difference in water repellent effectiveness between water-based and solvent-based coatings for ACQ or CA-treated wood. Overall, preservative treatments greatly enhanced coating …
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Vibrating lubricant-infused porous surface for enhanced liquid droplet transport
… surfaces (SLIPS) demonstrate extreme liquid repellency such that a droplet immiscible with the lubricant can roll off at a very small tilt angle < 5°. There have been many applications in using SLIPS to achieve complex fluids handling, anti-fouling, self-cleaning, anti-icing, and enhanced …
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The impact of bacteria on the biophysics of water retention and flow in soil
… (S, mm s-1/2) of the soil, indicative of water repellency, was determined using a mini-infiltrometer setup and has been reported as the rate of infiltration of water into the soil. Bacteria have been shown to increase water repellency of soil, decrease the total water content at saturation and …
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A novel encapsulation favorably modifies the skin disposition of topically-applied N,N-diethyl-3-methylbenzamide (DEET)
… the material on the skin surface for effective repellency via evaporation. Repellents must evaporate to maintain an effective vapor concentration at the skin surface in order to repel insects away from a host. Microcapsules were constructed using an interfacial precipitation method to form an …
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