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 12 of 12 for “"heterogeneous chemistry"”.
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Heterogeneous chemistry of HONO and surface exchange
… Despite the importance of HONO for atmospheric chemistry and about 30 years of detailed research the exact formation mechanisms of both day- and night-time formation remain unclear. The main formation pathways discussed to date are heterogeneous reactions with nitrogen dioxide as the HONO …
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Laboratory investigations of heterogeneous chemistry important to ozone depletion in the stratosphere
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Ambient measurements of chemical and physical properties of organic aerosols: Insights into formation, growth, and heterogeneous chemistry
<p>Organic aerosols are a ubiquitous component of the troposphere, from heavily polluted cities to the remote Arctic. In Chapters II, III, and V of this dissertation, the formation of organic aerosol through observations of ambient size distributions is addressed. Chapter IV presents a new pathway …
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Micro-physical modeling of aircraft exhaust plumes and condensation Trails
… concerns. To quantify these effects, global chemistry-transport models are frequently used. However, such models assume homogeneous and instant dilution into large-scale grid cells and therefore neglect micro-physical processes, such as contrail formation, occurring in aircraft wakes. This …
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Numerical simulations of ion transport membrane oxy-fuel reactors for CO₂ capture applications
… their interactions. The catalytic kinetics of heterogeneous oxygen surface exchange and fuel oxidation for a perovskite membrane in terms of the thermodynamic state in the immediate vicinity of or on the membrane surface was investigated. Perovskite membranes have been shown to exhibit both …
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Investigating the pH of atmospheric fine particles and implications for atmospheric chemistry
… nitrate trends and the role of acidity in heterogeneous chemistry. We found that PM2.5 remained highly acidic despite a ~70% sulfate reduction in the southeastern U.S. in the last 15 years, due to buffering by semivolatile NH3; that the bias in molar ratio predictions in past studies is …
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Reactive uptake of O₃ and N₂O₅ on organic mixtures and inorganic solutions coated with organic monolayers
… between gas-phase molecules and particles (heterogeneous reactions) affect not only the particle composition and morphology, but also the composition of the atmosphere. This thesis investigates the heterogeneous chemistry of organic mixtures and inorganic solutions coated with organic …
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Instrument development for exploring the influence of interfacial chemistry on aerosol growth, aging, and partitioning of gases
Investigation of aerosol chemistry and growth under atmospheric conditions in a novel rotating aerosol suspension chamber with cavity ring-down spectroscopy provided key insight into the effect of pollutants and other vapors on the overall atmospheric lifetime of particulate matter. The Atmospheric …
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Multiscale computational simulation of multidimensional chemically reacting flow over washcoated heterogeneous catalysts
… tabulation for the acceleration of transient, heterogeneous chemistry in large CFD models; and the development of catalytic washcoat performance relations informed by 3D reconstructions of actual, commercial washcoats. Ceramic microchannel heat exchangers/reactors have several distinct …
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Dynamics of Atmospherically Important Triatomics in Collisions with Model Organic Surfaces
… a gas and surface is crucial to the study of heterogeneous chemistry of atmospheric organic aerosols. In addition to changing the chemical and physical properties of the particle, reactions with oxidizing gases may alter aerosol optical properties, with implications for the regional radiation …
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Organic particle formation in halogen-influenced environments
… by their impact on climate, human health and heterogeneous chemistry. Secondary aerosol formation from the reaction of organic trace gases and reactive halogen species can act as an important natural source of organic aerosol. In order to better understand these reactions, aerosol formation …
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Design and microfabrication of multifunctional bio-inspired surfaces
… The Namib Desert beetle, harvests water from the heterogeneous pattern having hydrophilic/hydrophobic bumps on his back. Butterfly wings have re-entrant structures that manage to reach superhydrophobicity from a hydrophilic substrate. Hairy legs of water-walking insects are superhydrophobic with …