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Showing 1 to 20 of 299 for “"SIO"”.
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The Si/SiO(2) Interface Roughness
The Si/SiO$\sb2$ interface roughness has important effects on the performance of metal-oxide-semiconductor field effect transistor devices, which dominate contemporary integrated circuit technology. There have been intense efforts to study this system due to its importance. In this work, a new …
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Beiträge zur Chemie des höherkoordinierten Siliciums: Synthese, Struktur und Eigenschaften neuer Silicate mit SiO 3 C 2 -, SiO 4 C -, SiO 5 - und SiO 6 -Gerüst, Beiträge zur Chemie des tetrakoordinierten Siliciiums: Synthese, Struktur und Eigenschaften von Silanen, Silanolen und Siloxanen
… eines zwitterionischen l5Si-Silicates mit SiO3C2-Gerüst. In siedendem Acetonitril konnte 8 unter Methan-Abspaltung zum bekannten zwitterionischen l5Si-Spirosilicat 9 umgesetzt werden. 7.2 Synthese und Charakterisierung anionischer l5Si-Silicate und dianionischer l5Si,l5Si’-Disilicate mit …
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Electron tunneling processes in Si/SiO₂ systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Optical absorption of bismuth silicon oxide (Bi₁₂SiO₂₀) crystals
… optical absorption in bismuth silicon oxide (Bi₁₂SiO₂₀) crystals grown using the Bridgman technique and to identify electronic transitions responsible for absorption. Optical measurements were taken in the range of 0.4 - 11 pm at 300 K and 77 K using a spectrometer. The results show that near the …
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Controlling the assembly of proteins and cells on SiO₂ surfaces
… on the development of ultrathin films of PEG on SiO₂ surfaces that 1) can resist the nonspecific adsorption of proteins and cells ("bioinert surfaces ") and 2) can provide surface sites for the specific immobilization of biomolecules ("bioactive surfaces "). Effective methods to achieve these …
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Computational Modeling of a-SiO₂ Nanoparticles and their Electronic Structure Calculation
The spherical amorphous silica (a-SiO₂) nanoparticles (NPs) are constructed from a previous continuous random network (CRN) model of a-SiO₂ with the periodic boundary. The models of radii 12 Å, 15 Å, 18 Å, 20 Å, 22 Å, 24 Å and 25 Å are built from the CRN structure. Then, three types of models are …
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Deposition of Au/Pt on Co/SiO 2 for Fischer-Tropsch synthesis
… to effect the Co3O4 crystallite size (i.e. dispersion) and intrinsic activity of these catalysts [3]. These promoted catalysts are typically prepared by co-impregnation [4] or sequential impregnation [5, 6] with a noble metal precursor. This study investigates the preparation of cobalt …
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Electrical study of molybdenum in silicon and fluorinated SiO₂ for interlayer dielectrics
… was 5.5x10·16cm2. At high temperatures, the diffusion behavior of molybdenum exhibited a Gaussian profile. At low temperatures, however, the profiles exhibited an initial kick-out mechanism followed by normal diffusion. Fluorinated SiO2 is becoming an extremely important material for intermetal …
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Micro-fabrication of 3-D Si/air and Si/SiO₂/air PBG structures
Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998; and, Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Effects of flow on the activity of a WO₃-SiO₂ olefin disproportionation catalyst
This investigation consisted of a study of the effects of the reactant flow rate on the activity of a tungsten oxide on silica catalyst during propylene disproportionation. A 10 percent tungsten oxide on silica catalyst (223 square meters per gram B.E.T. surface area) was used in a microcatalytic …
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Diversity of compressional mechanisms among SiO<sub>2</sub> polymorphs : case of coesite and cristobalite.
Silica, SiO<sub>2</sub>, exists in a wide range of pressure and temperature conditions, accommodating its simple chemical composition by numerous polymorphs. More than 30 stable or metastable phases of silica are known, most of which occur at ambient to moderate pressures (<9 GPa). Understanding …
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Melt growth of BSO (Bi₁₂SiO₂₀) : critical issues for growth in a micro-g environment
… three-phase contact angles and the surface tensions ofBSO melts under varying partial pressure of oxygen (P02). The contact angle changed from 45° to less than 15° as P02 increased from 104 atm to 10-2 atm, however, the surface tension of BSO melts (- 200 mJ/m2) showed no dependence on P02. …
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The Structure and Polarization Properties of the SiO Masers in the Extended Atmosphere of R Aquarii
Silicon monoxide (SiO) maser emission has been observed towards many late-type stars. The conditions necessary for the formation of SiO masers dictate that they be produced in a region which is inside the silicate dust formation point close to the surface of the star. Very Long Baseline …
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The approach to equilibrium of mixtures of CaO, A1₂O₃, and SiO₂ heated to various temperatures
Equilibrium conditions in the CaO-Al₂O₃-SiO₂ ternary system as shown by the equilibrium diagram were established by allowing the solid phases to crystallize out of a liquid phase at specific temperatures. The purpose of this investigation was to determine whether equilibrium was attained or was …
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Density Functional Theory Study of Rutile SiO₂ Stishovite: An Electron Pair Description of Bulk and Surface Properties
… surface of stishovite, rutile structure type SiO₂, has been studied using a first principles, density functional method. The geometric and electronic structure, including the density of states, charge density, and electron localization function for both the bulk and the surface have been …
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A study of the crystal chemistry, electron density distributions, and hydrogen incorporation in the Al₂SiO₅ polymorphs
The Al₂SiO₅ polymorphs have been examined to provide new insights into their chemical bonding, their crystal chemistry, their equations of state, and the incorporation of water in the form of hydroxyl in their structures. The Al₂SiO₅ polymorphs provide a unique structural assemblage for a crystal …
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Spectroscopic and Electrical Characterization of SiO<sub>x</sub> and GaN Device Structures as a Function of Irradiation
… photons have enough energy to break bonds within SiO<sub>2</sub> causing electrons, holes, and radiolytic protons to be released. Holes will be trapped in E-prime centers and non-bridging oxygen hole centers (NBOHC), whereas radiatiolytic protons will form more positively charged P<sub>b</sub> …
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