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  • Radiation effects in III-V heterojunction bipolar transistors

    Creator:
    Vuppala, Soujanya
    Abstract:
    Electron and neutron irradiation effects in InGaP/GaAs single heterojunction bipolar transistors are investigated in this thesis. Devices with different emitter sizes and grown by two different growth techniques were examined. Based on the physics of heterojunction bipolar transistors and concepts of radiation damage mechanisms, the irradiation effects were analyzed. The...
    Resource Type:
    Masters Thesis
    Full Text:
    . This results in the reduction of equilibrium majority-carrier concentration. This affects any device

  • Continuous synthesis of metal-organic frameworks under high pressure

    Creator:
    Li, Yong J.
    Abstract:
    Metal Organic Framework (MOF) materials, consisting of metal ions with organic linkers, have a functional cavity structure which can be utilized in applications such as catalyst, micro sensing, and gas absorption. Due to MOF materials' selective gas adsorption property, interest in MOF materials has intensified in the last few years,...
    Resource Type:
    Masters Thesis
    Full Text:
    quality obtained, size control, and high yield with recycle solvent cooperation. The particle size

  • Catalytic chemical vapor deposition synthesis of carbon nanotubes from methane on SiO supported Fe and Fe−Ni catalysts

    Creator:
    Nakagawa, Ayako
    Abstract:
    Influences of operating conditions on the production of carbon nanotubes (CNTs) were studied using Fe and Fe-Ni bimetallic catalysts supported on silicon monoxide (SiO). The catalysts were prepared in three steps: (1) impregnation of SiO powders with ferric nitride or combinations of ferric and nickel nitrides, (2) oxidation of nitrides...
    Resource Type:
    Masters Thesis
    Full Text:
    , porosity, and density of catalysts, also strongly affect the yield of SWNTs [56]. From this view point, a

  • Density Functional Theory Study of the Reaction Mechanism of Chloride-induced Depassivation of α-Fe2O3

    Creator:
    Pang, Qin
    Abstract:
    Carbon steel, which contains mostly iron, has been widely used as reinforcement in reinforced concrete. In the alkaline environment in reinforced concrete, a thin iron oxide film, called the passive film, forms on the surface of the steel, which protects the surface from active corrosion. The exact atomic structure of...
    Resource Type:
    Dissertation
    Full Text:
    structure of the surface, but the effect is localized and it mostly affects the positions of the top two

  • Additive Manufacturing of Oxide Dispersion Strengthened Alloys via Laser Powder Bed Fusion

    Creator:
    Ghayoor Baghbani, Seyyed Milad
    Abstract:
    Having a series of excellent properties, the oxide dispersion-strengthened (ODS) steels provide promising solutions for the challenges of structural materials in nuclear energy, especially the development of future advanced nuclear fission and even fusion reactors. The current manufacturing route for ODS alloys includes mechanical alloying (MA) of master alloys or...
    Resource Type:
    Dissertation
    Full Text:
    retained in the ODS alloy even after aging at 1200 °C. The size of Y-Si-O nanoparticles after aging at

  • Synthesis of Intercalation Compounds and Nanocomposites of Inorganic Layered Hosts

    Creator:
    Liyanage, Medagama Liyanage Amila Udayanga
    Abstract:
    Novel synthetic strategies are developed to prepare new intercalation compounds and nanocomposites with several layered hosts (NiPS₃, Na-montmorillonite, MoS₂ and MoO₃). In these products, alkali metals are ionic intercalates and linear polymers, dendrimers or amines act as co-intercalates. In addition to new synthetic approaches, new structures are identified and characterized....
    Resource Type:
    Dissertation
    Full Text:
    times increase the crystallite size of the obtained products. Reaction progress studies indicate that

  • Predicting the Effect of Local Conditions on Metal-oxides: Pt/γ-Al₂O₃ Interface and Degradation of α-Cr₂O₃ Passive Film

    Creator:
    Oware Sarfo, Kofi
    Abstract:
    Metal-oxides are very important in industrial applications such as thermal barrier coatings, corrosion protection, and heterogeneous catalysis. The wide variety of applications for metal-oxides are derived from the array of properties of metal-oxides. It is, therefore, important to understand and predict the conditions of synthesis and operation to optimize the...
    Resource Type:
    Dissertation
    Full Text:
    and the size of catalyst clusters. Since catalytic activity and selectivity is impacted by the size

  • Characterization of CoGe Thin Films and Powders

    Creator:
    Pfau, Andrew James
    Abstract:
    Cobalt germanides have been widely studied as semiconductor contact materials, but recent theoretical studies suggest that they may also be excellent catalysts for methane steam reforming with stabilities and activities comparable to noble metal catalysts. In order to study the catalytic activity of cobalt germanides, it is critical to first...
    Resource Type:
    Masters Thesis
    Full Text:
    .  …………………………………………………………………………………………………………………………..     146     S3  AFM tapping phase data of CoGe films to show details of grain size and structure

  • Model programming of a direct contact condenser in solvent free microwave extraction of peppermint oil

    Creator:
    Du, Yihao
    Abstract:
    Solvent free microwave extraction (SFME) has been demonstrated to be feasible in extraction of essential oils from botanical materials. The benefits are no need for any solvent aside from the water naturally in the botanical material and a significant reduction in environmental impact for large scale production processes. However, the...
    Resource Type:
    Masters Thesis
    Full Text:
    Droplet Size ………..……………………………………………………. 30 5. Number of oil aerosol in capture efficiency computation

  • Controlling the Co-Precipitation of Colloidal PbSe Quantum Dots and Their Device Performance in a Diode Architecture

    Creator:
    McCrea, Tyler D.
    Abstract:
    In this work, colloidal PbSe quantum dots (QDs) are shown to be synthesized in a controlled manner by changing the growth time and reaction temperature in a microwave synthesis method. It is explained why quantum dots make such a unique material to create electronic devices and the specific benefits that...
    Resource Type:
    Masters Thesis
    Full Text:
    be spherical and size variation was kept between 9-15%. X-ray diffraction of each batch sample