Membrane-derived fluorinated radicals detected by electron spin resonance in UV-irradiated Nafion and Dow ionomers: Effect of counterions and H(sub 2)O(sub 2)

Article Abstract:

Electron spin resonance spectroscopy was used to detect and identify radicals formed by UV irradiation of Nafion and Dow perfluorinated membranes partially or fully neutralized by Cu(II), Fe(II), and Fe(III). The major conclusion obtained was that cations were involved in degradation process where the point of attack appears to be at or near the pendant chain of the ionomer.

Optical properties, Iron compounds, Copper compounds

---

Determining the geometry and magnetic parameters of fluorinated radicals by simulation of powder ESR spectra and DFT calculations: The case of the radical RC[F.sub.2]C[F.sub.2]. in nafion perfluroinated ionomers

Article Abstract:

The geometry and magnetic properties of fluorinated radicals RC[F.sub.2]C[F.sub.2] in nafion perfluroinated ionomers were determined by ESR spectra and DFT calculations. The ESR spectrum was accurately simulated by an automatic fitting procedure and DFT calculations supported the pyramidal structure determined by fitting the experimental ESR spectrum.

Analysis, Density functionals, Density functional theory, Perfluorocarbons, Structure

---

Nafion perfluorinated membranes treated in Fenton media: radical species detected by ESR spectroscopy

Article Abstract:

ESR spectroscopy is used to detect and identify radicals in Nafion perfluorinated membranes exposed to the Fenton reagent based on Ti(super 3+). In the Fenton reagent (TiCl3 + hydrogen peroxide, no Nafion) radicals were detected only for high concentrations of hydrogen peroxide, 30 percent w/v.

Science & research, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Hydrogen Peroxide, Research, Usage, Membranes (Biology), Electron paramagnetic resonance spectroscopy, Atomic properties

Similar abstracts:

• Abstracts: The formation of fluorinated tetraphenylporphyrin nanoparticles via rapid expansion processes: RESS vs RESOLV
• Abstracts: Critical assessment of electron spin resonance studies on Cu(I)-NO complexes in Cu-ZSM-5 zeolites prepared by solid and liquid-state ion exchange
• Abstracts: Structure of radicals from X-irradiated guanine derivatives: An experimental and computational study of sodium guanosine dihydrate single crystals
• Abstracts: Adsorption of a cationic dye molecule on polystyrene microspheres in colloids: Effect of surface charge and composition probed by second harmonic generation
• Abstracts: Oxide- and zeolite-supported molecular metal complexes and clusters: Physical characterization and determination of structure, bonding, and metal oxidation state

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.