EXAFS studies of nickel nafion ionomers

Journal Article · Sat Jan 01 04:00:00 EST 1983 · J. Polym. Sci., Polym. Phys. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1983.180210810· OSTI ID:5678568

Pan, H K; Yarusso, D J; Knapp, G S; Cooper, S L

Nafion membranes neutralized with Ni/sup 2 +/ have been examined by extended x-ray absorption fine-structure (EXAFS) and x-ray absorption near-edge-structure (XANES) spectroscopy. The results indicate that in both the dry and water-soaked membranes, the nickel is in an octahedral site with six oxygen atoms as nearest neighbors. The degree of disorder in the Ni-O distance is comparable to that in ionic crystals in both the dry and hydrated materials. A contribution from a second shell of neighbors is very weak in the dry samples but, surprisingly, this contribution is strongly accentuated in the hydrated membranes. The data indicate that this contribution is due to neighboring Ni/sup 2 +/ cations. Thus the water absorption seems to enhance the local ordering of the cation environment. The local structure does not depend strongly on the concentration of ionic groups in the materials. 37 references, 8 figures, 4 tables.

• Research Organization: Univ. of Wisconsin, Madison
• DOE Contract Number: AC02-81ER10922
• OSTI ID: 5678568
• Journal Information: J. Polym. Sci., Polym. Phys. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Phys. Ed.; (United States) Vol. 21; ISSN JPLPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360402* -- Polymers & Plastics-- Structure & Phase Studies-- (-1987)
ABSORPTION SPECTROSCOPY
CATIONS
CHARGED PARTICLES
COHERENT SCATTERING
COPOLYMERS
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELEMENTS
EXPERIMENTAL DATA
HYDRATION
HYDROGEN COMPOUNDS
INFORMATION
IONS
MEMBRANES
METALS
NICKEL
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN
OXYGEN COMPOUNDS
POLYMERS
SCATTERING
SOLVATION
SPECTROSCOPY
TRANSITION ELEMENTS
WATER
X-RAY DIFFRACTION