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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 24 for “"gas separation membranes"”.
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Engineering nanoporous materials for application in gas separation membranes
… and nanostructured surfaces for applications in gas separation membranes. Tunable methods have been developed to create inorganic hydroxide nanostructures on zeolite surfaces, and used to control the inorganic/polymer interfacial morphology in zeolite/polymer composite membranes. The study of the …
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Reverse-selective gas-separation membranes prepared by atom transfer radical polymerization
… reforming of hydrocarbons followed by the water gas shift reaction. However, this process gives ∼25 mol% CO<sub>2</sub> as a byproduct, and the energy and capital–intensive pressure swing adsorption (PSA) procedures for CO<sub>2</sub> removal exhibit some unavoidable H<sub>2</sub> loss. …
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Synthesis and Characterization of High Performance Polymers for Gas Separation Membranes
… polybenzoxazoles and polybenzimidazoles for gas separation applications. An abundance of monomers and novel polymers were synthesized and fabricated into membranes. Thermally rearranged polybenzoxazoles and their precursor polyimides were systematically studied with regard to size of pendant …
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Fabrication and characterization of poly(amide-imides)/TiO₂ nanocomposite gas separation membranes
Nanosized Ti0₂ rich domains were generated in-situ within poly(amide-imide) (PAl) and 6F-poly(amide-imide) (6FPAl) by a sol-gel process. The composite films showed a high optical transparency. The morphology of the Ti0₂ rich domains was observed by transmission electron microscopy (TEM). The Ti0₂ …
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Synthesis and Characterization of Poly(arylene ether sulfone)s for Reverse Osmosis Water Purification and Gas Separation Membranes
… the salt rejection of water purification membranes and the selectivity of gas separation membranes. An abundance of monomers, telechelic oligomers, and novel polymers were synthesized for use as separation membranes. These materials were often imbued with crosslinking functionalities to …
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Synthesis and Characterization of Toughened Thermally Rearranged Polymers, Poly(2,6-Dimethylphenylene-oxide) Based Copolymers and Polymer Blends for Gas Separation Membranes
… rearranged (TR) polymers have outstanding gas separation properties, but are limited in their industrial application due to being mechanically brittle. A series of low volume fraction of a poly(arylene ether sulfone) (PAES) block was introduced into the TR precursor polyhydroxyimide (PI) …
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Synthesis and Characterization of Hydrophilic-Hydrophobic Poly (Arylene Ether Sulfone) Random and Segmented Copolymers for Membrane Applications
… such as reverse osmosis, ultrafiltration, and gas separation. This dissertation covers structure-property-performance relationships of poly(arylene ether sulfone) and poly(ethylene oxide)-containing random and segmented copolymers for reverse osmosis and gas separation membranes. The second …
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Development of macroscopic nanoporous graphene membranes for gas separation
Separating components of a gas from a mixture is a critical step in several important industrial processes including natural gas purification, hydrogen production, carbon dioxide sequestration, and oxy-combustion. For such applications, gas separation membranes are attractive because they offer …
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Synthesis and Characterization of Novel Polybenzimidazoles and Post-modifications for Membrane Separation Applications
… including proton exchange membrane fuel cells, gas separation membranes, reverse osmosis and nanofiltration, and high performance coatings. The following studies are focused on the synthesis, characterization and related properties of polybenzimidazoles and polybenzimidazole based materials. A …
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Development of experimental methods to measure osmosis-driven water flux and molecular transport across nanoporous graphene membranes
… as a promising next generation high flux separation membrane. Molecular dynamics simulations predicted graphene's potential for exhibiting both high flux and selectivity as water desalination and gas separation membranes. Measurement of diffusive transport of water and molecules …
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Regioselective chlorination of cellulose esters
… including low cost of reagents and ease of separation. The chlorinated cellulose esters are useful intermediates for appending new functionalities by displacement reactions. We have synthesized a library of cellulose ester derivatives by this chlorination/nucleophilic substitution strategy, …
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Studies Toward Highly Fluorinated Polyphenylenes by Diels-Alder Polymerization
… stable polymers, used for dielectric resins, gas separation membranes, and fuel cell proton exchange membranes. Highly fluorinated DAPPs are expected to have better thermal stability and chemical resistance, higher glass transition temperatures, improved compatibility with other fluorinated …
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Development and gas permeation study of flat asymmetric polyphenylene oxide membranes.
Natural gas is a mixture of hydrocarbon gases and impurities. Processing is required to recover valuable hydrocarbon liquids, remove water vapor, and increase the heating value of the gas before it can be sold to consumers. In addition, the removal of acid gases such as hydrogen sulfide and carbon …
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Effect of Backbone Structure on Membrane Properties for Poly(arylene ether) Random and Multiblock Copolymers
… thermal stability, and fabrication into membranes. These materials can undergo a myriad of modifications including backbone structure variability, sulfonation, and crosslinking. In this dissertation, structure-property relationships are considered for poly(arylene ether)s with regard to …
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The isolation and study of rheological and mass transfer parameters in the spinning of advanced hollow fibre membranes for gas separation
… the dry gap in dry/wet spinning of hollow fibre gas separation membranes. To achieve this, studies were undertaken in which extrusion shear and forced convection residence time were, for the first time de-coupled and studied in isolation. Much of the previous work in the literature has …
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Layered graphene nanomaterials for gas separation membrane applications
Membrane-based gas separation technologies have attracted great interest because of their potential to improve separation performance, lower energy and capital costs, reduce the equipment size, minimize the environmental footprint, and provide easier operation. The performance of gas separation …
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ORMOCER (inorganic-organic hybrid polymer)-zeolite Nanocomposites: Advanced Membrane Materials for Gas Separation
… the fabrication of free-standing mixed matrix membranes. Such mixed matrix membranes comprise molecular sieve entities integrated in ORMOCER® matrix. Mixed matrix membranes have the potential to combine the processability of ORMOCER® materials with the superior transport and ion exchange …
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Catalytic membrane reactor-separator for environmental applications.
… at reduced operating temperature due to product separation and catalyst activity. An experimental work dealing with a forced flow-through membrane reactor is the subject of this thesis. The focus is on the performance and transport characteristics of selective thin-supported silica membranes and …
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Advanced Polymeric Membranes and Multi-Layered Films for Gas Separation and Capacitors
… focus on materials for polymeric capacitors and gas separation membranes. There is a need for polymeric capacitors with improved energy storage density and thermal stability. In this work, the affect of polymer molecular structure and symmetry on Tg, breakdown strength, and relative permittivity …
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