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 10 of 10 for “"ion exchange membrane"”.
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Direct measurement of vanadium cross-over in an operating redox flow battery
… of the RFB, due to its use of a single transition-metal element in both the positive and negative electrolytes. However, the performance of the VRB is affected by the cross-over of electrolytes through the ion-exchange membrane which separates the positive and negative electrolytes. Cross-over …
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Denitrification in Membrane Bioreactors
Three membrane bioreactors, a low flux filter (LFF), a diafilter (DF), and an ion-exchange (IE) membrane bioreactor were used to treat water polluted with 50 ppm-N nitrate. The three systems were compared in terms of removal efficiency of nitrate, operational complexity, and overall quality of the …
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Design and Characterization of Sectored (Patterned) IPMC Actuators for Propulsion and Maneuvering in Bio-Inspired Underwater Systems
… thesis is to characterize the performance of ionic polymer-metal composite (IPMCs) propulsors for underwater applications, namely for propelling and maneuvering small bio-inspired autonomous systems. Specifically, this work examines the capabilities of IPMCs with sectored (patterned) …
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Design of high-ionic conductivity electrodes for direct methanol fuel cells
… significantly under-utilized, while a small fraction of the catalyst facilitates the bulk of the oxidation reaction. In this thesis, the porous carbon electrode used as the anode in a DMFC is analyzed using Axiomatic Design theory. The imbalance of catalyst utilization in these electrodes is …
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Effects of a Control Release Nitrogen Fertilizer and Thinning on the Nitrogen Dynamics of a Mid-Rotation Loblolly Pine Stand in the Piedmont of Virginia
… deficiency is characteristic of many mid-rotation loblolly pine (Pinus taeda L.) plantations in the Piedmont region of the southeastern USA. Fertilization with urea is the most common method used to correct this deficiency. Previous studies show that urea fertilization produces a rapid pulse of …
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Reducing the energy demand of bioethanol through salt extractive distillation enabled by electrodialysis
… Security Act (EISA) of 2007, mandates the production of 136.3 GL/year of renewable fuels in the U.S. in 2022: 56.8 GL/year of corn-ethanol, 60.6 GL/year of second generation biofuels such as cellulosic ethanol, and 18.9 GL/year of advanced biofuels such as biomass-based diesel. One of the several …
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Nonlinear ion concentration polarization : fundamentals and applications
Ion exchange membrane (IEM) is a functional material that has a permselectivity of ions. Two types of IEMs - anion exchange membrane (AEM) and cation exchange membrane (CEM) - are used in a variety of electrochemical systems. Ion concentration polarization (ICP) is an ion transport phenomenon that …
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Iontoměničové membrány pro palivové články
Bakalářská práce se zabývá analýzou iontoměničových polymerních elektrolytů používaných v nízkoteplotních palivové článcích H2-O2. Cílem práce bylo vytvoření několika typů funkčních iontoměničových membrán s nalisovaným elektrodovým materiálem technologií MEA. Teoretická část pojednává o …
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Characterization and Modeling of the Ionomer-Conductor Interface in Ionic Polymer Transducers
Ionomeric polymer transducers consist of an ion-exchange membrane plated with conductive metal layers on its outer surfaces. Such materials are known to exhibit electromechanical coupling under the application of electric fields and imposed deformation (Oguro et al., 1992; Shahinpoor et al., 1998). …
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Ionic separation in electrodialysis : analyses of boundary layer, cationic partitioning, and overlimiting current
… strongly depends on the boundary layer near ion exchange membranes. The thickness of the boundary layer has not been clearly evaluated due to its substantial fluctuation around the spacer geometry. In this study, the boundary layer thickness was defined with three statistical parameters: the …