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 53 for “"Barrier layer"”.
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Bioreducible Polymer Nanosystems For Gene Delivery
… with DNA forming polyplex nanoparticles and layer-by-layer (LbL) thin films as gene delivery vectors. Atomic force microscope (AFM), especially in situ real time AFM, provides a microscopic view of DNA release dynamics. It is shown that the depolymerization of bioreducible polymer triggers …
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Growth and chemical characterisation studies of Mn silicate barrier layers on SiO2 and CDO
… as a possible copper interconnect diffusion barrier layer on both a 5.4 nm thick thermally grown SiO2 and a low dielectric constant carbon doped oxide (CDO), with the focus of understanding the barrier formation process. The self forming nature of this diffusion barrier layer resulting from …
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Technology and characterization of GaN-based heterostructure field effect transistors (HFETs)
… power amplifier devices. A common feature of the layer structure of such transistors is a GaN buffer which is usually deposited on non-native substrates, e.g. sapphire, silicon or SiC. A subsequent ternary barrier layer, such as AlGaN or AlInN, allows the realization of a so-called two-dimensional …
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Numerical Modeling of Steam Flushing for Removal of Dense Nonaqueous Phase Liquids
… (DDT) perched on a barrier layer were simulated with a nonisothermal multiphase, multicomponent model (CompSim) to both test the model’s ability to simulate DNAPL removal by steam flushing and to examine the effects of steam flushing on the fate and transport, …
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UBM Formation on Single Die/Dice for Flip Chip Applications
… bump structure to provide adhesion/diffusion barrier layer, solder wettable layer, and oxidation barrier layer between the bonding pads of the die and the bumps. Typically, UBM is deposited on the whole wafers by sputtering, evaporation, or electroless plating. These deposition techniques are …
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Corrosion susceptibility of thin films
… deposited on CVD W and sputtered W-Ti(10%) barrier layers. A galvanic series was developed by listing the stable open-circuit potentials for several metallizations, barrier metals and metallization/barrier-layer couples immersed in a 2000 ppm NH$\sb4$Cl electrolyte. Barrier layers of CVD W …
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Surface Reaction Mechanisms for Plasma Processing of Semiconductors
… etching and the deposition of a continuous barrier layer are critical processes for integration PS as ILDs. To investigate these issues, a reaction mechanism for plasma stripping of residual fluorocarbon polymer using oxygen-based chemistries has been developed and incorporated into the …
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Performance and Fouling during Bioreactor Harvesting
… surface faces the feed stream, and the tighter barrier layer faces the permeate stream, has been investigated for bioreactor harvesting. The open surface contains pores up to 40 µm in diameter, while the tighter barrier layer has an average pore size of 0.4 µm. </p> <p>The filtration …
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Structure-Property Relationships in Nitride Electronic Devices
… of surface defects and subsurface AlxGa1-xN barrier layer inhomogeneities on the local electrical properties. In plan-view DCUBE-SCM, a map of threshold voltage (Vth) distribution across the surface at the nanoscale is extracted from the dataset. Most surface defects reduce the magnitude of …
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Optical and material properties of varnishes for paintings
… of historic paintings to provide a protective barrier layer and/or change their appearance. The natural varnishes used by the original artist would have given the painting its original finished appearance. Over a period of years these varnish layers degrade with age, which changes the …
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Grazing Incidence X-ray Scattering from Magnetic Thin Films and Nanostructures
… sensor. Co/Al2O3 thin films and Co/MgO multilayer thin films have been characterized using x-ray reflectivity and diffuse scatter analysis to explain how preparatory oxidation of the lower ferromagnet in an MTJ can reduce Néel interlayer coupling and improve the consistency of …
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Hollow fiber sorbents for the desulfurization of pipeline natural gas
… cycles. An impermeable, thin polymer barrier layer on the outside of fiber sorbents allows only thermal interactions with the regeneration media, thereby promoting consistent sorption capacity over repeated cycles. A simplified flow pattern minimizes pressure drop, porous core …
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Introduction of a thermo-sensitive non-polar species into polyelectrolyte multilayer capsules for drug delivery
The layer-by-layer assembly (LBL) of polyelectrolytes has been extensively studied for the preparation of ultrathin films due to the versatility of the build-up process. The control of the permeability of these layers is particularly important as there are potential drug delivery applications. …
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Improved Fabrication and Quality Control of Substrate Integrated Microelectrode Arrays
Spontaneously active monolayer neuronal networks cultured on photoetched multimicroelectrode plates (MMEPs) offer great potential for use in studying neuronal networks. However, there are many problems associated with frequent, long-term use of MMEPs. The major problems include (1) polysiloxane …
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DEVELOPMENT AND IN-SITU CHARACTERIZATION OF BI-LAYERED LAMINATED COMPOSITES FOR ENHANCED MOISTURE BARRIER PERFORMANCE
… encapsulation by adding a polyurethane moisture barrier layer. This study focuses on the effects of moisture ingression by adding polyurethane and testing with embedded relative humidity sensors at different environmental conditions. The diffusivity of both the bi-layered composites and the pure …
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CMZP and Mg-doped Al2TiO5 Thin film Coatings for High Temperature Corrosion Protection of Si3N4 Heat Exchangers
… the formation of a protective oxidation barrier layer was promoted by the deposition of oxide thin films. Homogeneous and crack-free oxide coatings of calcium magnesium zirconium phosphate (CMZP) and magnesium doped aluminum titanate (Mg-doped Al2TiO5) were successfully deposited on Si3N4 …
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Nanowire Zinc Oxide MOSFET Pressure Sensor
… a combination of aluminum anodization, alumina barrier layer removal, ZnO atomic layer deposition (ALD), and wet etching for nanowire release were optimized to fabricate the sensor on a silicon wafer. The ZnO nanowire fabrication sequence presented is at low temperature making it compatible with …
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Effect of Amines as Corrosion Inhibitors for a Low Carbon Steel in Power Industry
… and SEM indicated the presence of a free-crack layer formed by fine particles in that set. FTIR showed that DBU apparently favored the formation of magnetite. It is believed that fine particles impede intrusion of aggressive ions into the metal surface by forming a barrier layer. FTIR …
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Development of Compound Semiconductor FET and Integrated Low -Voltage RF MEMS Switch Technology for Reconfigurable MMIC Applications
… HEMT structure presented here features a binary barrier layer to improve carrier confinement and increase current density. A metal-contact RF MEMS shunt switch has been developed as a low-loss, wide bandwidth passive component, and recent work has focused on achieving good reliability with low …
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The design and construction of a photoelectric spectrophotometer for analytical research
… of stray light present in the monochromator. A barrier layer cell coupled directly to a galvanometer was used in these determinations;Results of high precision were found to be not obtainable in the instrument constructed without the use of optical and electrical parts of precision …
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