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 “"Interfacial Reaction"”.
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Roles of Interfacial Reaction on Mechanical Properties of Solder Interfaces
In Bi-containing solder interfacial system, we found that Bi segregated to the Cu-intermetallic interface during aging in SnBi/Cu interconnect. This caused serious embrittlement of Sn-Bi/Cu interface. Further aging induced numerous voids along the Cu3Sn/Cu interface. These interfacial voids were …
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Interfacial reaction between SAC305 and SAC405 lead-free solders and electroless nickel/immersion silver (ENImAg) surface finish
… surface finish. Therefore, the effect on an interfacial reaction between lead-free solder and ENImAg surface finish using different solder ball size (Ø300μm, Ø500μm and Ø700μm) was investigated. All samples were subjected to an aging process with different aging times. The characterizations …
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Effect of temperature, oxygen partial pressure and current on the kinetics of the noble-metal / YSZ interfacial reaction
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.
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Interfacial Reaction of an Olefin-Terminated Self-Assembled Monolayer Exposed to Nitrogen Dioxide: An Investigation Into the Reaction Rate and Mechanism
Reactions of strongly oxidizing pollutants with unsaturated hydrocarbon surfaces are important to many areas of scientific interest. For example, reactions of unsaturated hydrocarbons on the surface of tropospheric aerosols could have a great effect on the oxidizing capacity of the troposphere …
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Al/ti(x)w(1-X) Metal/diffusion-Barrier Systems: Interfacial Reaction Paths and Kinetics as a Function of Composition and Microstructure
… were used to follow area-averaged and local interfacial reaction paths as well as microstructural changes as a function of annealing conditions. Information from the microchemical and microstructural analyses was used to model the sheet resistance results based upon a novel multi-element …
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Ohmic Metallizations to Aluminum Gallium Nitride/gallium Nitride High Electron Mobility Transistors: Electrical and Microstructural Studies
… of this work include: (1) Elucidated the interfacial reactions between Al, Ti, AlTi alloy, and Ti/Al/Mo/Au on GaN. (2) Explained the electrical performance of Ti/Al/Mo/Au on AlGaN/GaN based on microstructural investigations. Proposed a ""spike"" mechanism. (3) Identified the role of other …
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Continuous processing of multiphase reactions for pharmaceutical applications
… transfer. However, in contrast to single-phase reaction, transformation of multiphase reactions from batch to continuous flow still remains cumbersome due to complicated multiphase hydrodynamics, mass transfer, interfacial reaction kinetics, and potential clogging issues of solids.
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Atomic mobility in thin solid Pa2Si films
… linearly with time, both when controlled by an interfacial reaction and when limited by diffusion through the interposed silicide layer (when this layer is sufficiently thick). In the latter case it is predicted that the growth rate of the outer silicide layer is inversely proportional to the …
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The Electrochemical Nature of Non-Faradaic Catalysis at Interfaces
… captures the impact of electric fields on interfacial reaction kinetics in terms of experimentally measurable quantities. Yet, an experimentally accessible rate theory that rigorously captures electrostatic effects would enable deriving new molecular insight into the nature of interfacial …
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Visualization of water/oil displacement in porous media in the presence of chemical reaction.
In enhanced oil recovery, low interfacial tension, optimum wettability condition, high pH value, and the electric charge density at the interface can improve the oil recovery percentage appreciably. However, the addition of sodium hydroxide changes the interfacial tension to an ultra-low value. …
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Silver-magnesium thin film interactions in an oxidzing ambient
… out diffusion of Mg occurs at 350°C, and that reaction is completed at 500°C. Within the detection limits of the analysis techniques used, no interfacial reaction between Mg and SiO2 could be detected. The resistivity of the encapsulated silver films is about 4.3μQ -cm. XRD analysis revealed …
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Metallic thin film on SiGe/Si substrates
… of Si0.8Ge0.2(001) virtual substrate (VS), the interfacial reaction and growth mode of Ni thin film on Si0.8Ge0.2 VS at room temperature (RT), and the germanosilicide phase transformation at high temperatures. Similar studies on Si(001) and Ge(001) substrates were also carried out for …
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Fundamental Studies of Reactions between NO3 Radicals and Organic Surfaces
… science experiments were designed to study reaction kinetics and mechanisms of gas-phase NO₃ radicals with well-organized, highly characterized, organic thin films. The surface reactions were monitored in situ with reflection-absorption infrared spectroscopy (RAIRS). The oxidation states of …
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Effects of high energy mechanical milling on the kinetics of solid state reactions
… milling on the kinetics of solid state reactions in two binary metallic systems, Al-Ni and Cu-Al, and two metal-oxide systems, Al-TiO₂ and Cu(Al)-CuO, have been investigated by using X-ray diffractometry (XRD), differential thermal analysis (DTA), differential scanning calorimetry (DSC), …
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Foundations of Ohmic Contact Formation on Aluminum Gallium Nitride/gallium Nitride Heterostructures
… surface preparation, annealing ambient, and interfacial reaction products, is yet to emerge. A such, the focus of this work centers on the investigation of design, processing and materials' issues in the development and optimization of stable Ohmic contacts to AlGaN/GaN heterostructure …
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Divalent metal nanoparticles
… example, taking inspiration from the wellknown interfacial polymerization synthesis of nylon, we place carboxylic acid terminated molecules at the polar defect points and join the newly bifunctional nanoparticles into chains by reacting them with 1,6-diaminohexane through an interfacial reaction.
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Aspects of the reaction of CO and CO₂ with iron oxide-containing slags
A kinetic study of reduction and oxidation slag reactions of importance to the non-ferrous smelting industry was undertaken in the laboratory by employing a thermogravimetry technique. The reduction study included ferrous-to-iron and ferric-to-ferrous reactions whereas a limited amount of data on …
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Phosphate post-treatment of cerium-based conversion coatings on Al 2024-T3
… protection. Post-treated CeCCs also formed an interfacial reaction layer at CeCC/substrate interfaces, a response not observed for directly deposited CePO₄ coatings or as-deposited CeCCs. These results demonstrate that post-treated CeCCs are not static barrier coatings, but respond actively to …
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