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 197 for “"Phase behavior"”.
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Deuterium Phase Behavior in Thin Film Pd
The absorption of deuterium from the gas phase into Pd thin films was measured at room temperature with in situ neutron reflectometry. Room temperature solubility isothermal curves, out-of-plane film expansion, and deuterium depth profiles were determined from fits to the neutron reflectivity data. …
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Crystallization Kinetics and Phase Behavior of Molecular Solutions
… selectivity; and (ii) to develop a generalized phase diagram from first principles and verify its applicability to a wide range of molecular solutions. This thesis investigates how the rate of supersaturation affects macroscopic phase transitions and final crystal properties and how the …
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Structural properties and phase behavior in colloidal suspensions
… to elucidate the experimentally observed crystal phases of the Q and MS-2 virus particles in solution with multivalent salt and non-adsorbing polymer. Freeze casting is studied in Chapter 6. In this process colloidal particles are pushed by an advancing ice front. I use molecular dynamics …
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The Phase Behavior of Heavy Oil and Propane Mixtures
The phase behavior of propane diluted bitumen was mapped from temperatures between 20 and 180°C and pressures up to 10 MPa. Both vapor-liquid (VL) and liquid-liquid (LL) regions were observed. High pressure micrographs demonstrated that the heavy phase (a pitch phase) transitioned from a glass to a …
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Structural Characterization and Phase Behavior in Supported Metallic Nanoparticles
The reductive condensation of a carbon-supported molecular cluster precursor, PtRu5C(CO)16, into a bimetallic nanoparticle has been followed by using in-situ extended X-ray absorption fine structure spectroscopy, temperature programmed desorption, and scanning-transmission electron microscopy. The …
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Phase Behavior, Microstructure and Mechanics of Colloid -Polymer Mixtures
… the depletion driven changes to the suspension phase behavior, structure and flow properties as a function of the strength and range of interparticle interactions. In particular, we establish links between the suspension microstructure and the mechanical response of gels formed via short-range …
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Complex Phase Behavior of Exotic Oxides: Optical Spectroscopy Studies
… opening of correlation charge gap. The out-of-phase c-axis oxygen vibration phonon mode is seen to be closely associated with the metal-insulator transition possibly by modulating the bandwidth of the system. We also observed Raman scattering from two-magnon excitations in the antiferromagnetic …
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Complex phase behavior of exotic oxides: optical spectroscopy studies
… and spectroscopic ellipsometry, to study complex phase transition behavior exhibited by the doped rare-earth manganese oxides, R1_xDxMn03 (0 :::; x :::; 1), and the layered calcium ruthenium oxide, Ca3Ru20 7 , in which there exist strong correlations among charge, lattice, spin, and/or orbital …
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Exploring transport and phase behavior in nanoporous carbon materials
Understanding transport and phase behavior in nanopores has a substantial impact on applications involving membrane fabrication, single-molecule detection, oil reservoir modeling, and drug delivery. While transport and phase behavior in larger nanopores (>50 nm) approach bulk or are well-described …
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Phase behavior of systems containing nitrogen, methane, ethane, and propane
Abstract not available.
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Phase Behavior, Structure, and Properties of Colloidal Microsphere-Nanoparticle Mixtures
The phase behavior, structure, and properties of binary mixtures of negligibly charged colloidal microspheres were studied for two size ratios of 95 and 197 at pH = 1.5. In the absence of nanoparticle additions, the system spontaneously assembled into a colloidal gel whose strength increased with …
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Neutron scattering investigations on the unusual phase behavior of water
… of research, a coherent picture of the unusual phase behavior of water is so far lacking. The most promising theory under scrutiny relies on the hypothetical existence of a liquid-liquid phase transition and an associated liquid-liquid critical point hidden in the region of supercooled …
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Phase behavior of inorganic salts in sub- and supercritical water
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1998.
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Orientation and Phase Behavior of Block Copolymers in External Electric Fields
… on the influence of an electric field on the phase behavior. The electric field induced effects on concentrated block copolymer solutions were investigated by in-situ synchrotron small-angle x-ray scattering. The first part concerns the analysis of the mechanism and kinetics of the alignment …
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Adsorption Kinetics and Phase Behavior of Particles Adsorbed at an Interface
<p>The ability to predict the adsorption dynamic, phase behavior, and surface pressure of a monolayer of adsorbed particles in two-dimensional systems are key aspects of many current research areas. Examples include phase transitions in amphiphilic monolayers, emulsion stability due to particle …
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An Investigation of Protein Interactions and the Relationship to Phase Behavior
… in solution are inherently linked to phase behavior. A fundamental understanding of the relationship is necessary to develop efficient methods for crystallizing proteins. In this investigation, lysozyme second virial coefficient measurements consistently reflect trends in lysozyme …
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The Phase Behavior of Ubqln Proteins and Implications for Protein Quality Control
… granules in cells and undergoes liquid-liquid phase separation (LLPS) in vitro. LLPS is a biophysical process by which proteins separate themselves from the surrounding aqueous solution by forming protein-rich droplets. The overarching goals of this work are to understand how the UBQLN family …
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Spectroscopic Study of Compressible Mobile Phase and Stationary Phase Behavior in Chromatography
… (SFG) spectroscopy are used to investigate the behavior of compressible mobile phases and stationary phases under a variety of chromatographic conditions. Efforts to understand and optimize separations employing compressible mobile phases have been limited by a lack of understanding of the …
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