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Precipitation of ferrites in Nafion® membranes
Author(s) -
Raymond Louise,
Revol J.F.,
Ryan D. H.,
Marchessault R. H.
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960214)59:7<1073::aid-app4>3.0.co;2-b
Subject(s) - maghemite , magnetite , materials science , superparamagnetism , transmission electron microscopy , ferrimagnetism , membrane , ferrite (magnet) , chemical engineering , nafion , nanocomposite , mössbauer spectroscopy , scanning electron microscope , analytical chemistry (journal) , magnetometer , precipitation , composite material , nanotechnology , metallurgy , chemistry , crystallography , chromatography , magnetization , biochemistry , physics , electrode , quantum mechanics , electrochemistry , meteorology , magnetic field , engineering
Iron oxide particles were precipitated in Nafion® 117 perfluorinated ion‐exchange membranes using four different methods. Precipitated ferrites yielded magnetically responsive nanocomposite films and probed structural variations in the membrane. Optical microscopy, transmission electron microscopy, vibrating sample magnetometry (VSM), and Mössbauer spectroscopy were used to characterize the materials. Microscopy showed that the ferrites were distributed unevenly across the films with a dense skin making up the surface layers. Higher temperature enhanced accessibility to iron and increased ferrite loadings were obtained for these samples. Nanosize particles of magnetite (Fe 3 O 4 ) were present as disks or as clusters of disks in all the treated films. Needles and bundles of needles of maghemite (γ‐Fe 2 O 3 ) were produced in the films that were reacted at the boil. All the samples exhibited superparamagnetic response by VSM. Due to the shorter time scale of the Mössbauer measurement (∼ 10 −7 s), ferrimagnetic response was detected for boiled and autoclaved samples. © 1996 John Wiley & Sons, Inc.