Nafion equivalent weight
WitrynaAfter synthesis, Nafion is cast into thin membranes by heating in aqueous alcohol at 250 °C in an autoclave. 2 These membranes are characterised by both their thickness and … Witryna13 kwi 2024 · Additionally, even at ambient temperature, they have a significant intrinsic proton conductivity of 0.02–0.1 S·cm −1. 62, 63 As displayed in Figure 6a, Lu et al. 64 constructed a porous Nafion matrix, submerged it in HPW solution, and then sealed the membrane's upper and lower ends with Nafion.
Nafion equivalent weight
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Witryna9 gru 2007 · a, Average chemical structure of Nafion of 1,100 equivalent weight.The number of 14 CF 2 groups per side branch shown is the average in this more or less … Witrynacan be dried to form films and coatings of Nafion™ or mixed with other solids to form electrodes. More LIQUION™ Solutions. concentrations: solid concentrations of 5% or …
Nafion can be manufactured with or exchanged to alternate cation forms for different applications (e.g. lithiated for Li-ion batteries) and at different equivalent weights (EWs), alternatively considered as ion-exchange capacities (IECs), to achieve a range of cationic conductivities with trade-offs to other … Zobacz więcej 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 … Zobacz więcej Nafion can be produced as both a powder resin and a copolymer. It has various chemical configurations and thus several chemical … Zobacz więcej The combination of the stable PTFE backbone with the acidic sulfonic groups gives Nafion its characteristics: • It is highly conductive to cations, making it suitable for many membrane applications. • It resists chemical attack. According to Chemours, … 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 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 … 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 WitrynaMeasurements of water absorption and ionic conductivity as a function of relative humidity (RH) were carried out on membranes comprised of …
WitrynaThe EW is defined as the weight of Nafion per mole of sulfonic acid group. For example, Nafion 117 represents 1100 g EW + 0.007 inch in thickness. In contrast equivalent … Witryna16 lip 2024 · The chemical structure of Nafion ionomer with an equivalent weight (EW) of about 1000 g of dry polymer per mol of sulfonic-acid groups was used as the model …
Witrynawhere EW is the equivalent weight of the dried Li-Nafion samples (equal to 1106) and Mr solv is the average molar mass of the used binary solvent. 2.4. Thermal Analysis. The thermal behaviour of the samples was investigated using a DSC 214 Polyma differential scanning calorimeter (NETZSCH, Selb, Germany). A test sample was cut out of the ...
Witryna20 wrz 2004 · Equivalent weight (EW) is the number of grams of dry Nafion per mole of sulfonic acid groups when the material is in the acid form. This is an average EW in … gift announcement templateWitrynaClick here to view the Nafion™ N115 and other products from Nafion Store. We are experts in Nafion ion exchange materials. fry9c reporting instructionsWitrynaOn the other hand, ion exchange capacity (IEC) of Nafion 117 is about 0.88 meq.gr-1, while Nafion 211 exhibits IEC value of about 0.98 meq.gr-1. Also, you can compare … giftanschlag castrop rauxelgift annual exclusion 2021Witryna5 sty 2024 · Oxygen permeability (DH) and proton conductivity in ultra-thin Nafion films (100-1000nm) were respectively characterized on SiO2 substrate via limiting current measurement and electrochemical impedance spectroscopy for a range of temperature and relative humidity conditions. ... Effects of Electrode Thickness and Ionomer … fry-9c formsWitrynaThe influence of incorporation of the dopants with proton-acceptor properties into perfluorosulfonic acid cation exchange membranes (MF-4SC and Nafion), and their treatment conditions on the characteristics of Donnan potential (DP)-sensors (analytical signal is the Donnan potential) in the aqueous solutions containing asparaginate and … fry 9c report instructionsWitrynaChemical formula for the acidic form of Nafion The equivalent weight is defined as the weight of dry polymer in grams containing one mole of exchange sites. An … gift anonymous