Issue 26, 2012

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

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

Article information

Article type
Paper
Submitted
12 Jun 2012
Accepted
16 Aug 2012
First published
16 Aug 2012

RSC Adv., 2012,2, 9993-9997

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements