Characterization of magnetic membranes based on bacterial and man-made cellulose

Ferrites were synthetized in situ in two different neutral cellulose gels: a never-dried bacterial cellulose membrane and a never-dried cast film using N-methylmorpholine-N-oxide as solvent. X-ray diffraction, transmission electron microscope (TEM), vibrating sample magnetometry (VSM) and Mossbauer...

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Bibliographic Details
Published in:Cellulose (London) 1998-03, Vol.5 (1), p.5-17
Main Authors: SOURTY, E, Ryan, D H, Marchessault, R H
Format: Article
Language:English
Subjects:
Bacteria
Cellulose
Electron microscopes
Ferrites
Gels
Iron oxides
Magnetic measurement
Magnetization curves
Mossbauer spectroscopy
Nanocomposites
Nucleation
Photomicrographs
Transmission electron microscopy
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Summary:Ferrites were synthetized in situ in two different neutral cellulose gels: a never-dried bacterial cellulose membrane and a never-dried cast film using N-methylmorpholine-N-oxide as solvent. X-ray diffraction, transmission electron microscope (TEM), vibrating sample magnetometry (VSM) and Mossbauer spectroscopy were used to characterize the resulting magnetic nanocomposites. TEM micrographs showed the presence of ferrites in two different shapes, acicular and equiaxial, respectively hydrated ferric oxides (FeOOH) and the spinel oxides: maghemite (gamma-Fe2O3) or magnetite (Fe3O4). Thin sections of bacterial cellulose showed these particles to be located along the cellulose microfibrils, which are assumed to provide a site for their nucleation. Room temperature magnetization curves showed all samples to be superparamagnetic
ISSN:0969-0239
1572-882X
DOI:10.1023/A:1009207027869