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  1. Templated growth of superparamagnetic iron oxide nanoparticles by temperature programming in the presence of poly(vinyl alcohol)
Templated growth of superparamagnetic iron oxide nanoparticles by temperature programming in the presence of poly(vinyl alcohol)
1751 viewed

Templated growth of superparamagnetic iron oxide nanoparticles by temperature programming in the presence of poly(vinyl alcohol)

Mahmoudi, M

Templated growth of superparamagnetic iron oxide nanoparticles by temperature programming in the presence of poly(vinyl alcohol)

Mahmoudi, M ; Sharif University of Technology | 2010

1751 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.tsf.2009.12.112
  3. Publisher: 2010
  4. Abstract:
  5. Magnetite (Fe3O4) nanostructures with different morphologies including uniform nanoparticles, magnetic beads and nanorods were synthesized via a co-precipitation method. The synthesis process was performed at various temperatures in the presence of polyvinyl alcohol (PVA) at different concentrations. It is shown that small amounts of PVA act as a template in hot water (70 °C), leading to the oriented growth of Fe3O4 nanorods, which was confirmed by selected area electron diffraction. Individually coated magnetite nanoparticles and magnetic beads were formed at a relatively lower temperature of 30 °C in the folded polymer molecules due to the thermo-physical properties of PVA. When a moderate temperature (i.e. 50 °C) was used, nanorods and nanobeads co-existed. At higher concentrations of PVA (polymer/iron mass ratio of 5), however, the formation of magnetic beads was favored. The nanorods were shown to be unstable upon exposure to electron beams. Freezing/thawing process was applied post synthesis as temperature programming to fabricate stable nanorods with rigid walls
  6. Keywords:
  7. Freezing/thawing process ; Iron oxide ; Magnetic properties ; Nanoparticle ; Nanorods ; Poly(vinyl alcohol) ; Transmission electron microscopy ; Coprecipitation method ; Freezing/thawing process ; Hot water ; Magnetic beads ; Magnetite nanoparticles ; Mass ratio ; Moderate temperature ; Nanobeads ; Oriented growth ; Polymer molecule ; Postsynthesis ; Rigid wall ; Selected area electron diffraction ; Superparamagnetic iron oxide nanoparticles ; Synthesis process ; Temperature-programming ; Templated growth ; Thermo-physical property ; Electron beams ; Electrons ; Iron oxides ; Magnetic materials ; Magnetic properties ; Magnetite ; Nanomagnetics ; Nanoparticles ; Oxide minerals ; Precipitation (chemical) ; Scanning electron microscopy ; Superparamagnetism ; Transmission electron microscopy ; Water ; Nanorods
  8. Source: Thin Solid Films ; Volume 518, Issue 15 , 2010 , Pages 4281-4289 ; 00406090 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0040609010000374