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 13 of 13 for “"Modified membranes"”.
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Post-Synthetic Chemical and Morphological Modifications of Polymer Membranes for Gas Separations
… research and development in microporous polymer membranes to fully realize their potential in gas separation applications. Free volume manipulation (FVM) is an innovative post-synthetic modification approach designed to address the permeability–selectivity tradeoff of polymer membranes. This …
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Surface engineering using layer-by-layer assembly of pH-sensitive polymers and nanoparticles
… including colloidal particles and porous membranes has been achieved by using layer-by-layer assembly of pH-sensitive polymers and nanoparticles. In the first part of this thesis, hydrogen-bonded multilayer coatings comprising poly(acrylic acid) and polyacrylamide were used to …
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Development of Thin-Film Composite Membranes Incorporated With Graphene Oxide and Derivatives for Forward Osmosis Processes
… performance of the thin-film composite (TFC) membranes. Nonetheless, very few studies provided an in-depth explanation of the possible interaction between GO and polymer matrix that alter the membrane properties and performance. Thus, the overall aim of this study was to develop …
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Improvements to Polyamide Reverse Osmosis Membranes for Removal of Small, Neutral, Hydrophilic Solutes
… is reverse osmosis (RO). RO uses permselective membranes to remove solutes from source water while allowing clean permeate to pass through. While RO facilities treating municipal wastewater for potable purposes are already in operation, selectivity limitations to state-of-the-art RO membranes …
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Prevention of biofouling in seawater desalination via initiated chemical vapor deposition (iCVD)
… due to the delicate nature of desalination membranes, the vast diversity of fouling organisms, and the additional cross-membrane transport resistance exerted by an extra layer of coating. This thesis focuses on benign interface engineering methods and ultra-thin zwitterionic coating …
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Preparation, characterization and testing of inorganic ceramic membranes.
… scale using low efficient Inorganic Ceramic membranes has been proposed. This was achieved by the addition of second and third stage permeation trains to the existing low CO2 recovering Ceramic Inorganic membranes. The Inorganic Ceramic membrane development involved modification of Alpha …
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I. Depolymerization-macrocyclization of (o-phenylene-ethynylene)-alt-(arylene-ethynylene) copolymers II. Improving existing water filtration membranes via covalent modification
… II. Improving Existing Water Filtration Membranes via Covalent Modification Over a billion people in the world already have limited access to safe drinking water, and the problem is steadily growing worse due to contamination of our water supply. Therefore, we need an efficient, …
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TiO2-doped Ionic Polymer-Metal Composite Actuator
… X-Ray and UV-Visible spectra of the fabricated membranes indicate the presence of anatase-TiO2 in the modified membranes. Water uptake of TiO2-doped membrane with 0.16 wt% of doping level show highest value among the samples. In the Differential Scanning Calorimetry results, glass transition …
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Modification of thin film composite (TFC) membrane by incorporation with copper nanoparticles (Cu-NPs) for antibacterial properties
… onto the surface of thin film composite (TFC) membranes via either electrostatic interactions or by covalent bonding with cysteamine as a linker. The electrostatic method was simply to immerse the newly made TFC membranes to the Cu-NPs suspension. Since the CTAB had formed cationic bilayer …
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Innovative hydrocarbons recovery and utilization technology using reactor-separation membranes for off-gases emission during crude oil shuttle tanker transportation and natural gas processing.
… of separated gases? Characterisation of the modified membranes was carried out using nitrogen physisorption measurements and showed the hysteresis isotherms corresponding to type IV and V, which is indicative of a mesoporous membrane. The surface area and the pore size were determined using …
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Solvent resistant microporous/nanoporous polymeric hollow fiber and flat film membranes and their applications
… stability of most commercially available membranes is limiting the utilization of the above mentioned membrane technologies. This dissertation was primarily focused on developing solvent resistant hollow fiber and flat film membranes for separation and purification of organic-solvent-based …
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Design and fabrication of asymmetric nanopores using pulsed PECVD
… measurements demonstrate that the pulsed PECVD-modified TE membranes exhibit higher selectivity without compromising on the flux due to their asymmetric structure. For example, the TiO2 modified supports were demonstrated to deliver high retention (~ 75%) of bovine serum albumin (BSA) protein …
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Synthesis and Characterization of Linear and Crosslinked Sulfonated Poly(arylene ether sulfone)s: Hydrocarbon-based Copolymers as Ion Conductive Membranes for Electrochemical Systems
… copolymers have numerous potential applications. Membranes cast from these copolymers are desirable due to their good chemical and thermal stability, excellent mechanical strength, satisfactory conductivity, and excellent transport properties of water and ions. These copolymers can be used in a …