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Showing 1 to 11 of 11 for “"anion exchange membranes"”.
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Transport properties of anion exchange membranes for fuel cell applications
… humidity, and cost effective. Although proton exchange membranes (PEM), such as Nafion® are highly conductive and chemically and mechanically stable, PEMs are not widely used in fuel cells due to the higher cost of fluoropolymers and the platinum metal catalysts. Anion exchange membranes (AEM) …
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Anion Exchange Membranes (AEMs), based on Polyamine Obtained by Modifying Polyketone, for Electrochemical Applications
Polymeric anion exchange materials can be key components for forming membranes for use in several electrochemical applications. Polyketones seem particularly promising as materials for making anion exchange membranes (AEMs), not only because the starting monomers, carbon monoxide and ethylene, are …
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Poly(4-vinylpyridine)-filled microporous membranes: Factors affecting transport and selectivity
<p>Pore-filled anion exchange membranes containing poly(4-vinylpyridinium) have been prepared by photochemically initiated free radical polymerization of 4-vinylpyridine and divinylbenzene in the pores of a polypropylene microporous membrane followed by alkylation or protonation of the incorporated …
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Multiscale Tortuous Diffusion in Anion- and Cation-Exchange Membranes: Exploration of Counterions, Water Content, and Polymer Functionality
… ion conductivity in polymer electrolyte membranes (PEMs). Herein, we present comprehensive water transport measurements comparing anion-exchange membranes (AEMs) based on ammonium-functionalized poly(phenylene oxide) and cation-exchange membranes (CEMs) based on sulfonated poly(ether …
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Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations
… polymers are used in graphene oxide composite membranes towards aqueous filtration. Guanidinium-functionalized polymers are explored for impedance-based gas sensing. Pyrazolium-functionalized polymers are fabricated into anion-exchange membranes. In Chapter 2, we design a set of two- and …
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Novel conducive alkaline polymer membranes for fuel cells
A series of anion exchange membranes synthesised from poly (2, 6-dimethyl-1, 4-phenylene oxide) (PPO) have been investigated for water electrolysis applications. The prepared membranes were characterised using electrochemical impedance spectroscopy, infrared spectroscopy and thermal gravimetric …
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Nutrient Movement in Streamside Management Zones and Piedmont Streams Following Forest Fertilization
… studied using surface water collectors, cation/anion exchange membranes, lysimeters, and stream grab-samples. Measurement devices were spaced symmetrically across the SMZ from the uphill SMZ edge to stream edge with grab samples being collected approximately 20m upstream and 20m downstream of …
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Enhancing materials for fuel cells and organic solar cells through molecular design
… for enhancing ion conductivity of ion exchange membranes in fuel cells. Triptycene motif is incorporated to increase charge density and fractional free volume in the membranes. In Chapter 1.2, sulfonated triptycene poly(ether ether ketone) (S-tripPEEK) is synthesized and studied for …
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SYNTHESIS OF PERFLUOROHETEROAROMATIC POLYMERS FOR ION-CONDUCTING MEMBRANE FUEL CELLS VIA FREE RADICAL-BASED REACTIONS AND SYNTHESIS OF DI-CATIONIC IONIC LIQUIDS AS EFFICIENT SO2 ABSORBENTS
… acid polymers (PFSAs). Two proton-exchange membranes perfluorobenzoic acid (PFBA) and perfluorobenzenesulfonic acid (PFBSA)—were synthesized for proton-exchange membrane fuel cells via the free radical-based reaction. The physical properties, in-plane ionic conductivities and fuel …
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Catalyst Layer Design in Polymer Membrane Fuel Cells
… the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). The most realistic method of estimating the performance of non-PGM catalysts is testing within membrane electrode assemblies (MEAs). One key issue is that non-PGM catalysts are not as active as platinum. One …
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Purification of plasmid DNA for use in human gene therapy
… EFD module, containing six helical wound tubular membranes promoting centrifugal instabilities known as Dean vortices, with distilled water between the Dean number's of 187Dn and 818Dn,and the transmembrane pressures (TMP) of 0 to 5 psi. The data demonstrated that the fluid dynamics significantly …