Nafion hydrophobic
WitrynaEncouragingly, the copolymer membranes demonstrate a similar performance to Nafion under well hydrated conditions, which can be further optimized by a combination of numerical modeling and experimental characterization to develop new-generation membranes with better properties. ... (hydrophobic) domains, whose proton … Witryna16 Owing to its micellar structure with hydrophobic domains, 17,18 Nafion has been investigated as a support matrix for enzyme immobilization. Nafion/oxidase systems have been developed to enhance ...
Nafion hydrophobic
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Witryna29 mar 2010 · A new hydrophobic thin film catalyst layer (CL) was prepared by the decal method in this work. Polytetrafluoroethylene (PTFE) was introduced to the … Witrynadynamics of water confined in the hydrophilic regions of Nafion. The kinetics of proton transfer in Nafion are tracked by following the excited-state proton transfer and recombination kinetics of a molecular probe, pyranine (HPTS). The hydrophilic domains of Nafion grow with increased hydration, and the interfacial regions reorganize, …
Nafion is a brand name for a sulfonated tetrafluoroethylene based fluoropolymer-copolymer discovered in the late 1960s by Dr. Walther Grot of DuPont. Nafion is a brand of the Chemours company. It is the first of a class of synthetic polymers with ionic properties that are called ionomers. Nafion's unique … Zobacz więcej Nafion can be produced as both a powder resin and a copolymer. It has various chemical configurations and thus several chemical names in the IUPAC system. Nafion-H, for example, includes the following … Zobacz więcej Nafion derivatives are first synthesized by the copolymerization of tetrafluoroethylene (TFE) (the monomer in Teflon) and a derivative of a perfluoro (alkyl vinyl ether) with sulfonyl acid fluoride. The latter reagent can be prepared by the pyrolysis of its respective Zobacz więcej The morphology of Nafion membranes is a matter of continuing study to allow for greater control of its properties. Other properties such as water management, hydration stability at high temperatures, electro-osmotic drag, as well as the mechanical, … Zobacz więcej • What Nafion Membrane is Right for an Electrolyzer / Hydrogen Generation? • Homepage of Walther G. Grot • Walther G. Grot: "Fluorinated Ionomers" • Isotopic effects on Nafion conductivity Zobacz więcej The combination of the stable PTFE backbone with the acidic sulfonic groups gives Nafion its characteristics: • It … Zobacz więcej Nafion's properties make it suitable for a broad range of applications. Nafion has found use in fuel cells, electrochemical devices, chlor-alkali production, metal-ion recovery, water Zobacz więcej Normal Nafion will dehydrate (thus lose proton conductivity) when the temperature is above ~80 °C. This limitation troubles the design of fuel cells because higher temperatures … Zobacz więcej WitrynaHydrophobic moieties of the polyelec-trolyte can contribute to the complexes formation, being incor-porated in the intracomplex micelles and additionally stabiliz-ing the complexes and decreasing cac values [ 40, 41, 43–45]. Therefore, micelle-forming surfactants comprising alkyl chains able to interact with hydrophobic Nafion matrix …
WitrynaNafion consists of hydrophilic sulfonic acid groups dispersed in a hydrophobic matrix of tetrafluoroethylene and perfluoroalkyl ethers [18,24,44–53]. The sulfonic acid groups sorb water swelling the hydrophilic network through which water and protons are transported. WitrynaThe microstructure of Nafion varies in response to changes in hydration. Thus, it undergoes a transition from tightly packed bundles of inverted micelles with aqueous …
WitrynaThe highly hydrophobic fluorocarbon backbone of Nafion favorably interacts with hydrophobic PEDOT of PEDOT:PSS. These factors give rise to the extension of π …
WitrynaIn contrast, bare Nafion, Nafion/CNTs, and Nafion-212 membranes exhibited inferior proton conductivity, current output, power output, and durability under identical HAFC operating conditions. View bluetooth スピーカー 本体 両方WitrynaDownload scientific diagram Nafion membrane structure; it is made of a hydrophobic backbone of PTFE with pending chains of - double ether ended in SO 3 H from … bluetooth スピーカー 接続 音が出ないWitrynaThe Nafion™ perfluorinated membranes have the extraordinary chemical and thermal stability of Teflon™ resins. While Teflon ™ resin is one of the most hydrophobic substances known, Nafion™ membranes are one of the most hydrophilic. They absorb water and some polar organics rapidly, even at room temperature, in amounts bluetooth スピーカー 異音