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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 656 for “"Separations"”.
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Bijels For Continuous Reactive Separations
Several chemical processes involve the use of mutually immiscible molecules, for example a water-soluble catalyst is used in combination with oil-soluble reagents. There are two possible strategies to run these processes. A mutual solvent can be used to promote mixing of the otherwise immiscible …
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Nanofluidic Channels for Biological Separations
Nanofluidic channels are used to separate DNA molecules by length and applications of the channels to other biomolecules are discussed. The problem of separating DNA and biomolecules by length, charge, or other physical characteristics has consumed a tremendous amount of time and resources over the …
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Three-dimensional separations in compressors
… design process by exploring the formation of 3D separations. Detailed measurements in compressor cascades, tests in a low-speed single stage Deverson compressor rig and considerable use of Denton multi-stage Reynolds averaged Navier-Stokes (RANS) solver MULTIP have provided better understanding …
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Designing Microporous Polymers for Separations
In Chapter 1, we investigate the influence of side-chain length and dispersity in ring-opening metathesis polymerization (ROMP) polymers with pore-generating side chains. Macromonomers with four discrete monodispersities are separated and polymerized to produce bottlebrush polymers with …
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Electrochemically mediated separations and catalysis
Mediated electrocatalysis was also investigated as a means of generating electrolyte-free hydrogen peroxide streams. This was achieved by employing redox mediator phase-transfer (RMPT) to produce and isolate aqueous H₂O from the electrolysis of H₂O and O2 where the quinone mediator was 'trapped' in …
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Multidimensional liquid chromatographic separations for proteomics
… for both the ion-exchange and reversed phase separations, with the fractions varying in complexity. Separation of modified proteins in the ion-exchange dimension demonstrated separation of isoforms. Most analyses coupled anion-exchange chromatography in the first dimension to monolithic …
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The Unsteady Topology of Corner Separations
… axial compressor is throttled three-dimensional separations develop in the corners between the blades and annulus endwall. Surprisingly, little is understood about the unsteady topology of these separations. One of the problems with studying corner separations is that it is often difficult to …
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Conducting polymers for electrochemically mediated separations
Many conventional separation technologies are limited by high energy costs, generation of chemical wastes, and lack of molecular selectivity. This thesis is motivated to develop novel separation techniques that overcome the aforementioned drawbacks for the separation of neutral organic compounds …
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Selective Ion Separations Using Shock Electrodialysis
… for new principles and methods for improved ion separations. Electrochemical methods in particular have attractive features such as compact size, modularity, chemical selectivity, broad applicability, and reduced generation of secondary waste. In this thesis, we investigate the emerging …
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Acrylic polyampholyte solutions for protein separations
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1994.
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Electrokinetic separations involving surfactants and proteins
Methods for the analysis of surfactants and proteins by Capillary Electrophoresis (CE) were investigated. Several modifications of the system to achieve detection and separation of these analytes were examined. These modifications included buffer additives, sample additives and surface treatment …
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Elutriation Technology in Heavy Mineral Separations
Hindered-bed separators have been used in several different mineral processing fields for many years. Recent improvements in designs have led to the development of the CrossFlow separator. This new design employs a tangential feed system that has shown promise in several applications. This paper …
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Electrokinetic separations in fused silica capillaries
Methods of co-optimizing resolution and detection in Capillary Zone Electrophoresis (CZE) and Micellar Electrokinetic Chromatography (MEKC) are examined by deriving mathematical expressions which illustrate the relative importance of various experimental parameters. For CZE, expressions are derived …
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Block copolymer Ion gels for CO2 Separations
Block copolymer ion gel is composed of a polymer network formed by self-assembly of triblock copolymers, and an ionic liquidIn this thesis project, the target is to study the gas separation performance of ion gels for CO2 separation, and seek ways to optimize their properties in terms of the gas …
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The separations of picoline isomers by enclathration
The chemical and physical properties of isomers make them difficult to separate using conventional methods. This renders the separation of isomers one of the more challenging obstacles in chemistry. In these cases, the supramolecular phenomenon of host-guest chemistry may be used in order to …
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Redox-active materials for electrochemically-mediated separations
… development, and application of materials for separations. Electrochemical approaches are an attractive alternative due to the innate propensities of redox-active species for modular design, molecular recognition, reversible operation, and lower energetic requirements, all of which can be …
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Organometallic redox-interfaces for selective electrochemical separations
… in organic synthesis, metal-recovery and bio-separations. The design of selective stimuli-responsive interfaces is a crucial challenge for advanced electrochemical processes. Whereas redox-electrodes are well known in sensing, catalysis and energy storage, here we focus on their unique …
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TCAQ-based polymer for electrochemically mediated separations
Redox-mediated separation systems offer the potential to efficiently desalinate water and to purify contaminated waste streams, among other health and environmental applications. A TCAQ-based polymer, unique for its two-electron redox reaction, was synthesized for use in redox-mediated separation …
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The development of nanofluidic platforms for biomolecular separations
… can be addressed by performing these separations and purifications in smaller, nanofluidic based systems. This dissertation presents research conducted to explore how fluids, electrical fields, and dissolved analytes of interest (including biomolecules) behave in nanoconfined systems. …
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