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 66 for “"metal deposition"”.
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Spontaneous metal deposition from organic solutions for electronic materials applications
<p>"Electrochemical deposition (ECD) has been used widely in the electronics industry. A novel "galvanic deposition" process was used for spontaneous and selective ECD of metal from organic solutions in contrast to the more conventional aqueous media. The more noble metal ions loaded in the organic …
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Strengthening porous metal skeletons by metal deposition from a nanoparticle dispersion
… achieve wide application in direct production of metal parts. This work seeks to reduce sintering and deformation of porous metal skeletons during liquid-metal infiltration by reinforcing the skeletons with metal deposits. This can be accomplished by depositing a metal from a suspension of …
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Repetitive process control of additive manufacturing with application to laser metal deposition
… framework, with an application to a specific metal-based AM process, whereby the deposition of the current layer is affected by both in-layer and layer-to-layer dynamics, both of which are driven by the state of the previous layer. The proposed modeling framework can be used to create …
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Investigation of effect of process parameters on multilayer builds by direct metal deposition
<p>"Multilayer direct laser deposition (DLD) is a fabrication process through which parts are fabricated by creating a molten pool into which metal powder is injected as. During fabrication, complex thermal activity occurs in different regions of the build; for example, newly deposited layers will …
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Fabrication and characterization of advanced materials using laser metal deposition from elemental powder mixture
… large and complex parts from high-performance metals (i.e., titanium components for aerospace applications), so users attempt to circumvent the high cost of materials. Laser metal deposition (LMD) is an additive manufacturing technique capable of fabricating complicated structures with superior …
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Thermal and Microstructure Modeling of Metal Deposition Processes with Application to Ti-6Al-4V
Laser metal deposition (LMD) offers a unique combination of process flexibility, time savings, and reduced cost in producing titanium alloy components. The current challenge in processing titanium alloys using LMD methods is understanding the complex microstructure evolution as a part is fabricated …
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Metal deposition on TiO2(110) via thermal evaporation, photolysis and thermolysis: a combined FT-RAIRS and XPS study
… a powerful tool for the study of oxide supported metal overlayers. This thesis describes the synthesis and characterisation of Cu, Mo and Au overlayers on TiO2(110) deposited using a number of methods.<br/>Cu overlayers were deposited on the TiO2(110) surface via Physical Vapour Deposition (PVD) …
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Scanning tunneling microscopy and spectroscopy of tip-induced direct writing of nanometallization in ultra-high vacuum
… scanning tunneling microscopy (STM) nanometallization on Si(100):H of HfB2 and MgB2. We first give an introduction to graphene nanoribbons (GNRs) along with STM and the techniques therein. We found that with STM, self-standing nanoscale features including dots, wires, and 3D structures …
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Development and application of field methods for determination of the extent of acid mine drainage contamination and geochemical characteristics of stream sediment recovery
Metal-mining processes can negatively affect surface and ground waters through the generation of acidic mine drainage (AMD). Introduced metals typically are deposited from the water column onto the stream bed downstream of the AMD input(s). The drivers of metal deposition onto stream sediments are …
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Tin Sensitization For Electroless Plating
… developed the electroless plating for surface metallization method. It was found to be an interesting topic to study tin sensitization for chemically controlling metal deposition on different substrates, because the tin sensitization process had critical effects on the electroless plated metal …
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Templated aqueous synthesis of inorganics within carboxyl-containing block copolymer domains
… First, the successful application of electroless metal deposition within the sub-surface lamellar domains of an amphiphilic block copolymer is presented. Several electroless metals were selectively deposited inside the interconnected network of the water-permeable block domains containing …
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Influence Of Applied Potential And Metal Ion Concentraion On Metal Electrodeposition At Micron Gap Gold Electrodes
… approach for fabricating nano-scale (metal/metal) or molecular (metal/polymer or self-assembled monolayer (SAM)/metal) junctions that should be useful in preparing working sensors and molecular electronic devices. The fabrication of metal/metal junctions involves metal deposition on …
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Experimental investigation of new coating methods for 3D-printed cathodes for hydrogen production
… considered with nickel as coatings using electrodeposition. The results are obtained from electrochemical measurements and hydrogen production testing. The electrochemical activity of the electrodes is improved with the addition of catalysts. Higher current densities are obtained at the same …
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Methods for the development of a DNA based nanoelectronics
… but does not require DNA modification. (iv) The metallization of DNA. A synthesis procedure was developed, which results in the formation of continuous chains of 5nm platinum clusters along the DNA. The metal deposition process turned out to take place exclusively at the DNA while background …
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SYNTHESIS, CHARACTERIZATION, DECORATION AND FILLING OF CARBON NANOTUBES
… from two angles. The first approach, involving metal deposition directly onto the oxidized tube surfaces, yielded nanotubes decorated with very fine particles of gold and nanoparticles of Pd/Pd oxides. Tubes filled with a Pd compound were also observed. The second method involved electroless …
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Electron beam lithography for nano-antenna fabrication
… that Cr would be a better choice as a metallic coating as compared with Cu. Furthermore for metal deposition methods, sputter coating would be a better method in comparison with PVD, because it gives a less damaged device during lift-off and also Cr's lift-off time is much less than …
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Studies of tartaric acid modified nickel supported catalysts for enantioselective hydrogenation reactions
… reaction. Even though the techniques of metal deposition explored did not allow incorporation of Ni in the internal surface of the materials, it was found that the morphology of the support plays an important role in enantioselectivity. In addition, for a given material, the incorporation …
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Polyelectrolyte multilayers as nanostructured templates for inorganic synthesis
… carboxylic acid groups, were used to bind metal cations within the film. Metallic and semiconducting nanoparticles, including Ag, Pd, and ZnS, were formed in situ by reduction or sulfidation of the bound metal cations. The size and concentration of Ag nanoparticles were controlled by the …
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Build strategy investigation of TI-6AL-4V produced via a hybrid additive manufacturing process
“Till now, laser metal deposition (LMD) has been developed with the capability of near-net shape high-performance metal parts fabrication, especially complicated titanium alloys, nickel alloys, and aluminum alloys. However, LMD processed parts usually do not meet end-use requirements without post …
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