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 604 for “"Wetting"”.
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Wetting of non rigid surfaces
In the world of anti-wetting surfaces, many superhydrophobic substrates comprise rigid structures on rigid substrates. The development of a thin flexible substrate would allow new avenues to be explored to fully take advantage of the non-wetting properties of superhydrophobicity. This thesis …
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Hydrophobic Forces in Wetting Films
… makes it difficult to model the rupture of the wetting films using the DLVO theory. In the present work, we have measured the kinetics of film thinning between air bubble and flat surfaces of gold and silica. The former was hydrophobized by ex-site potassium amyl xanthate, while the latter by …
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WETTING TRANSITIONS AT NANOSTRUCTURED SURFACES
… hydrophilic/hydrophobic surfaces. Switchable nanowetting dynamics. Understanding the dynamic response of contact angle on switchable hydrophobic-hydrophilic surfaces is key to the design of nanofluidic and optical devices. We use molecular dynamics simulation for water droplets with different …
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Wetting kinetics in forced spreading
<p>"Under dynamic conditions, the dynamic contact angle (the angle that the liquid makes with the solid) of a liquid on a solid surface varies dramatically with substrate velocity from its equilibrium value. Experimental data of the dynamic contact angles for polydimethylsiloxane (PDMS or silicone …
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Wetting Phenomena Near the Melting Curve
… crystal-fluid phase transition and equilibrium wetting states for systems in contact with various hard substrates was undertaken using Monte Carlo (MC) and molecular dynamics (MD) techniques. Through the use of MD the phase transition was found to occur at the crystal density …
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Experimental Investigations on Non-Wetting Surfaces
… surfaces (LIS) exhibit exceptional non-wetting characteristics that make them attractive for energy production applications including steam condensation and fouling mitigation. The dissertation work focuses on application of non-wetting surfaces to energy production using a systematic …
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A study of bubble wetting on surfaces
… works toward a better understand of bubble wetting on surfaces, so that future microfluidics devices can be designed to be more robust and free of bubbles. Current wetting theory as applied to bubbles is examined, and two key areas for improvement are identified: disjoining pressure effects …
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Surface and Hydrodynamic Forces in Wetting Films
… surface of a bubble, the thin liquid films (or wetting films) of water formed in between must rupture. According to the Frumkin-Derjaguin isotherm, it is necessary that wetting films can rupture when the disjoining pressures are negative. However, the negative disjoining pressures are difficult …
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Wetting and frosting/defrosting study on microgrooved surfaces
… mm x 45 mm in size, with a thickness about 3 mm. Wetting anisotropy, contact angle hysteresis, and drainage behavior of water droplets on the microgrooved surfaces are found to be significantly affected by the variation in groove geometry parameters. Deposited water droplets of a wide range of …
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Surface wetting methods compatible with solid SERS substrates
… wet the nanostructures. The topic of surface wetting receives little to no attention in the SERS literature. Yet, wetting experiments on gold SERS nanodomes, used as a case study, resulted in a distinctly hydrophobic behavior, which is incompatible with aqueous sensing. Outside the field of …
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Wetting of ceramic particulates with liquid aluminum alloys
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1987.
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Evaporation-induced non-wetting droplets on superhydrophilic surfaces
… in spontaneous spreading and hence complete wetting. However, in this thesis, we demonstrate that this wetting behavior can be altered by superheating the substrate such that droplets can reside in a non-wetting state due to evaporation. Photolithography and deep reactive ion etching were …
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Wetting and Penetration Behavior of Resin/Wood Interfaces
… by looking at the relationship between the resin wetting onto wood and the resulting penetration into wood lumens. Wetting was analyzed with the sessile drop method, which observed the initial contact angle and change in contact angle over 35s. Penetration was measured within each individual …
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Analysis of Interfacial Processes on Non-Wetting Surfaces
Non-wetting surfaces mainly categorized into superhydrophobic (SHS), lubricant-infused (LIS) and solid-infused surfaces (SIS), by virtue of their superior water repellant properties have wide applications in several energy and environmental systems. In this dissertation, the role of non-wetting …
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Capillary forces and wetting dynamics by diffuse-interface modeling
<p>Wetting phenomena underlie many natural and industrial processes, from the proper functioning of the lungs to the thin coating of surfaces. The three-phase interactions involved at microscopic scales play a critical role. Adding solid particles to an emulsion, for example, can drastically change …
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Dynamic Contact Angles And Wetting Front Instability In Soils
… a mechanism for initiating the instability of wetting fronts and the formation of gravity fingers/columns in porous media. To study those dynamic contact angles when gravity effects are present, rectangular capillary tubes are used to facilitate the observation of the complete interface without …
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Dynamic wetting/dewetting processes in complex liquid-solid systems
… Kodak Ltd. Mathematical models for dynamic wetting phenomena are incorporated into a specially developed finite element based numerical platform. By examining different models, it was found for the first time that the interface formation model is capable of describing the experimentally …
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The wetting of alumina by vitreous abrasive wheel bonds
Thesis: M.S., Massachusetts Institute of Technology, Department of Metallurgy, 1959
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Wetting transition and fluid trapping in a microfluidic fracture
… immiscible fluid-fluid displacement in partial wetting regime, defending fluid is often trapped as a liquid film on solid surfaces through the mechanism of wetting transition. Here, we study the impact of roughness on wetting transition and fluid trapping in a microfluidic fracture. We …
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