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Issue 26, 2012
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X-Ray micro-tomography of freeze dried nickel alginate beads and transformation into NiO nanopowders

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Abstract

A generic ion-exchange mediated sol–gel method has been developed for the production of high purity nickel and other metal oxide nanopowders using sodium alginate precursor. X-Ray micro-tomography (XMT) shows that the nickel ions have been uniformly cross-linked in the alginate structure and remained stable after freeze drying as evidenced by the bright green color of the freeze dried beads. The freeze dried nickel alginate beads exhibit a porous foam-like structure composing of a thin nickel alginate film and a dominant fraction of voids. The porous nickel alginate beads when calcined at 700 °C for 1 h in ambient air yielded spherical nickel oxide nanoparticles of ∼50 nm in size. Powder X-ray diffraction (XRD) confirms that the sample is single phase cubic NiO powders with no trace of impurity. The mean crystallite sizes calculated from XRD analysis using the Rietveld refinement method agree with the morphological features observed by transmission electron microscopy (TEM).

Graphical abstract: X-Ray micro-tomography of freeze dried nickel alginate beads and transformation into NiO nanopowders

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Publication details

The article was received on 12 Jun 2012, accepted on 16 Aug 2012 and first published on 16 Aug 2012


Article type: Paper
DOI: 10.1039/C2RA21171H
Citation: RSC Adv., 2012,2, 9993-9997
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    X-Ray micro-tomography of freeze dried nickel alginate beads and transformation into NiO nanopowders

    Z. Wang, G. M. Kale, Q. Yuan and M. Ghadiri, RSC Adv., 2012, 2, 9993
    DOI: 10.1039/C2RA21171H

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