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Showing 1 to 20 of 86 for “"Surface reactions"”.
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Resonance Forcing in Catalytic Surface Reactions
Die vorliegende Arbeit untersucht theoretisch und experimentell die raumzeitliche Musterbildung der CO-Reaktion auf Pt(110) mit den Methoden der nichtlinearen Dynamik. Die Reaktion selbst ist eine gut erforschte und verstandene chemische nichtlineare Reaktion auf einer Einkristalloberfläche. Es …
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Surface reactions of boron with clean tungsten substrates
… function changes for different adsorbates. The reactions of chemically, vapor-deposited (CVD) boron with clean tungsten substrates were studied using field emission microscopy (FEM) and low energy electron diffraction (LEED). The studies by FEM indicate that boron nucleates in the vicinals of …
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Hydrogen Permeation Through Nickel And Nickel Alloys: Surface Reactions And Trapping
… is diffusion controlled, is influenced by surface reactions or affected by internal trapping.<br></br><br></br>Analysis of data obtained for hydrogen permeation through nickel show that hydrogen is dissociatively chemisorbed in nickel.<br></br><br></br>The permeation parameters diffusivity, …
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In situ studies of surface reactions affecting Li-ion battery failure
… components and electrolyte where so-called side reactions occur; such as Li trapping in non-active regions, loss of active electrode material, gas evolution, electrolyte decomposition, and chemical reactions with packaging and current collectors. Particular side reactions dominating capacity fade …
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I. Kinetic Modeling of Surface Reactions II. Computational Design of Organic Semiconductors
… methods to simulate the chemical kinetics of surface reactions. For systems with static disorder in the rate constants and short-range correlation in the densities of reactants, we propose the half heterogeneous pair approximation (HHPA). Combining the intuitions of the mean-field steady state …
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Manipulated Electrochemical Surface Reactions Induced By Oscillatory Electric Potentials on Metal Based Electrodes
… research effort investigates the manipulation of surface electrochemical reactions induced by oscillating electric potentials on the surface of metal-based electrodes. Specifically, this research presents experimental data identifying modified electrochemical surface reactions caused by low …
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Initial surface reactions and nucleation kinetics of boron on atomically clean molybdenum substrates
… on the boron covered molybdenum field emitter surfaces. The boron-induced work function change of molybdenum has been shown to be in agreement with a theoretical model which predicts positive, as well as negative work functions for adsorbate-substrate systems. It has previously been found that …
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Surface reactions and electrical double layer properties of ceramic oxides in aqueous solution
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1984.
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Fundamental Mechanisms of Photo-Stimulated Surface Reactions During Laser-Induced and Laser-Assisted Crystal Growth
… of ultra-violet lasers to alter the chemistry of surfaces during vapor-phase crystal growth and the fundamental mechanisms of these interactions during the growth of thin films has been examined. Three growth techniques have been studied. These are: laser-induced chemical vapor deposition (LCVD), …
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Nuclear magnetic resonance investigation of mineral surface reactions involving inner-sphere and outer-sphere complexes
… of anions and cations adsorbed onto mineral surfaces, using $\sp{31}$P and $\sp{133}$Cs magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Phosphate and Cs are good examples of inner-sphere and outer-sphere complexes, respectively, and this study shows that NMR is in …
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Critical gas-phase and surface reactions involved in the chemical vapor desposition of diamond films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Field and laboratory investigation of ozone-indoor surface reactions: secondary emissions inventory and implications for indoor air quality
… volatile organic compounds, as a result of ozone-surface interactions, can lower an occupant's exposure to ozone, but increase indoor concentrations of odorous and carcinogenic compounds. Therefore, investigation of ozone-surface interactions are necessary for better understanding and controlling …
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The electronic structure of galena and hematite surfaces: applications to the interpretations of STM images, XPS spectra and heterogeneous surface reactions
… helped to understand which states of the mineral surfaces were imaged depending on the bias voltage and tip-sample separation. The computational results also gave insight in electron transfer processes that take place during surface adsorption/oxidation/reduction processes. In this context, …
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The Intrinsic Activation Energy as a Guide to Mechanisms of Reactions on Solid Surface
… activation energies calculated from gas phase reactions have been shown to provide practical information about the kinetics and mechanisms of surface reactions. Ab initio calculations showed that reaction pathways which involve C-C or C-O bond scission have 30 kcal/mole higher intrinsic …
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Multiscale modeling of thin film deposition processes
… kinetic energies in IPVD process involve complex surface interactions that affect overall topology of the microscale features. Copper ECD process involves complex surface reactions and transport phenomena that ranges over different length scales. In this work, predictive simulation tools for these …
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Surface Reaction Mechanisms in Plasma Etching Processes
Surface reactions occurring in fluorocarbon plasmas also influence plasma properties by consuming or generating plasma fluxes. Of particular interest is the effect that surfaces have on CF2 densities, as CF2 is a precursor for polymer formation. These processes were investigated with the integrated …
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Study of surface kinetics in PECVD chamber cleaning using remote plasma source
… Toroidal Plasma (TCTP); to understand gas phase reactions and surface reactions of neutrals in the cleaning chamber by analyzing the concentration of neutrals in downstream cleaning process chamber; and to make a global model that predicts the partial pressure of active species in the cleaning …
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New understandings of surface diffusion
Surface diffusion is of fundamental importance in a variety of industrial kinetic processes, including surface reactions, crystal growth and sintering. However, surface diffusion parameters are rarely used to model industrial processes, resulting from three deficiencies in the literature. First, of …
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Silicon Carbon(001) Gas-Source Molecular Beam Epitaxy From Methyl Silane and Silicon Hydride: The Effects of Carbon Incorporation and Surface Segregation on Growth Kinetics
… is due to a complex interaction among competing surface reactions. During growth of the initial Si-rich sublayer, C strongly segregates to the second layer resulting in charge transfer from surface Si atom dangling bonds of to C backbonds. This, in turn, decreases the Si2H6 sticking probability …
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